FANUC AC SPINDLE MOTOR @C* series

DESCRIPTIONS

B-65372EN/01
Ȧ No part of this manual may be reproduced in any form.
Ȧ All specifications and designs are subject to change without notice.

In this manual we have tried as much as possible to describe all the

various matters.
However, we cannot describe all the matters which must not be done,
or which cannot be done, because there are so many possibilities.
Therefore, matters which are not especially described as possible in
this manual should be regarded as ”impossible”.
B-65372EN/01 SAFETY PRECAUTIONS

SAFETY PRECAUTIONS
This "Safety Precautions" section describes the precautions which
must be observed to ensure safety when using FANUC spindle
motors.
Users of any spindle motor model are requested to read this manual
carefully before using the spindle motor.
The users are also requested to read this manual carefully and
understand each function of the motor for correct use.
The users are basically forbidden to do any behavior or action not
mentioned in this manual. They are invited to ask FANUC previously
about what behavior or action is prohibited.

For matters that are not described in this manual, a machine must be
designed and assembled in accordance with EN60204-1 to ensure the
safety of the machine and compliance with European specifications.
For details, refer to the specification.

Contents
1.1 DEFINITION OF WARNING, CAUTION, AND NOTE.........s-2
1.2 WARNING ................................................................................s-3
1.3 CAUTION..................................................................................s-5
1.4 NOTE ...................................................................................s-7

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SAFETY PRECAUTIONS B-65372EN/01

1.1 DEFINITION OF WARNING, CAUTION, AND NOTE

This manual includes safety precautions for protecting the user and
preventing damage to the machine. Precautions are classified into
Warning and Caution according to their bearing on safety. Also,
supplementary information is described as a Note. Read the Warning,
Caution, and Note thoroughly before attempting to use the machine.

WARNING
Applied when there is a danger of the user being
injured or when there is a damage of both the user
being injured and the equipment being damaged if
the approved procedure is not observed.

CAUTION
Applied when there is a danger of the equipment
being damaged, if the approved procedure is not
observed.

NOTE
The Note is used to indicate supplementary
information other than Warning and Caution.

- Read this manual carefully, and store it in a safe place.

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B-65372EN/01 SAFETY PRECAUTIONS

1.2 WARNING

WARNING
- Be safely dressed when handling a motor.
Wear safety shoes or gloves when handling a motor as you may get
hurt on any edge or protrusion on it or electric shocks.

- Use a crane or lift to move a motor from one place to another.

A motor is heavy. If you lift the motor by hand, you may get a
backache, or you may be seriously injured when you drop the motor.
A suitable crane or lift must be used to move the motor. (For the
weight of motors, refer to Chapter II-2 “SPECIFICATIONS.”)
When moving a motor using a crane or lift, use a hanging bolt if the
motor has a corresponding tapped hole, or textile rope if it has no
tapped hole. If a motor is attached with a machine or any other heavy
stuff, do not use a hanging bolt to move the motor as the hanging bolt
and/or motor may get broken.

- Before starting to connect a motor to electric wires, make sure they are isolated
from an electric power source.
A failure to observe this caution is vary dangerous because you may
get electric shocks.

- Be sure to secure power wires.

If operation is performed with a terminal loose, the terminal block
may become abnormally hot, possibly causing a fire. Also, the
terminal may become disconnected, causing a ground fault or short-
circuit, and possibly giving you electric shocks. See the section in this
manual that gives the tightening torque for attaching power wires and
short-bars to the terminal block.

- Be sure to ground a motor frame.

To avoid electric shocks, be sure to connect the grounding terminal in
the terminal box to the grounding terminal of the machine.

- Do not ground a motor power wire terminal or short-circuit it to another power

wire terminal.
A failure to observe this caution may cause electric shocks or a
burned wiring.
* Some motors require a special connection such as a winding
switching. Refer to their respective motor specification manuals
for details.

- Do not supply the power to the motor while any terminal is exposed.
A failure to observe this caution is very dangerous because you may
get electric shocks if your body or any conductive stuff touches an
exposed terminal.

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SAFETY PRECAUTIONS B-65372EN/01

WARNING
- Do not bring any dangerous stuff near a motor.
Motors are connected to a power line, and may get hot. If a flammable
is placed near a motor, it may be ignited, catch fire, or explode.

- Do not get close to a rotary section of a motor when it is rotating.

You may get your clothes or fingers caught in a rotary section, and
may be injured. Before starting a motor, ensure that there is no stuff
that can fly away (such as a key) on the motor.

- Do not touch a motor with a wet hand.

A failure to observe this caution is vary dangerous because you may
get electric shocks.

- Before touching a motor, shut off the power to it.

Even if a motor is not rotating, there may be a voltage across the
terminals of the motor.
Especially before touching a power supply connection, take sufficient
precautions.
Otherwise you may get electric shocks.

- Do not touch any terminal of a motor for a while (at least 5 minutes) after the
power to the motor is shut off.
High voltage remains across power line terminals of a motor for a
while after the power to the motor is shut off. So, do not touch any
terminal or connect it to any other equipment. Otherwise, you may get
electric shocks or the motor and/or equipment may get damaged.

- To drive a motor, use a specified amplifier and parameters.

An incorrect combination of a motor, amplifier, and parameters may
cause the motor to behave unexpectedly. This is dangerous, and the
motor may get damaged.

- Before driving a motor, be sure to secure it.

If a motor is drove without being secured, it may roll over during
acceleration or deceleration, injuring the user.

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B-65372EN/01 SAFETY PRECAUTIONS

1.3 CAUTION

CAUTION
- Do not touch a motor when it is running or immediately after it stops.
A motor may get hot when it is running. Do not touch the motor
before it gets cool enough. Otherwise, you may get burned.

- Be careful not get your hair or cloths caught in a fan.

Be careful especially for a fan used to generate an inward air flow.
Be careful also for a fan even when the motor is stopped, because it
continues to rotate while the amplifier is turned on.

- FANUC motors are designed for use with machines. Do not use them for any other
purpose.
If a FANUC motor is used for an unintended purpose, it may cause an
unexpected symptom or trouble. If you want to use a motor for an
unintended purpose, previously consult with FANUC.

- Ensure that a base or frame on which a motor is mounted is strong enough.

Motors are heavy. If a base or frame on which a motor is mounted is
not strong enough, it is impossible to achieve the required precision.

- Ensure that motors and related components are mounted securely.

If a motor or its component slips out of place or comes off when the
motor is running, it is very dangerous.

- Be sure to connect motor cables correctly.

An incorrect connection of a cable cause abnormal heat generation,
equipment malfunction, or failure. Always use a cable with an
appropriate current carrying capacity (or thickness). For how to
connect cables to motors, refer to their
respective specification manuals.

- Ensure that motors are cooled if they are those that require forcible cooling.
If a motor that requires forcible cooling is not cooled normally, it may
cause a failure or trouble. For a fan-cooled motor, ensure that it is not
clogged or blocked with dust and dirt. For a liquid-cooled motor,
ensure that the amount of the liquid is appropriate and that the liquid
piping is not clogged. For both types, perform regular cleaning and
inspection.

- When attaching a component having inertia, such as a pulley, to a motor, ensure

that any imbalance between the motor and component is minimized.
If there is a large imbalance, the motor may vibrates abnormally,
resulting in the motor being broken.

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SAFETY PRECAUTIONS B-65372EN/01

CAUTION
- Be sure to attach a key to a motor with a keyed shaft.
If a motor with a keyed shaft runs with no key attached, it may impair
torque transmission or cause imbalance, resulting in the motor being
broken. With the αi series, a shaft with no key is used as standard.

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B-65372EN/01 SAFETY PRECAUTIONS

1.4 NOTE

NOTE
- Do not step or sit on a motor.
If you step or sit on a motor, it may get deformed or broken. Do not
put a motor on another unless they are in packages.

- When storing a motor, put it in a dry (non-condensing) place at room temperature

(0 to 40 °C).
If a motor is stored in a humid or hot place, its components may get
damaged or deteriorated. In addition, keep a motor in such a position
that its shaft is held horizontal and its terminal box is at the top.

- Do not remove a nameplate from a motor.

If a nameplate comes off, be careful not to lose it. If the nameplate is
lost, the motor becomes unidentifiable, resulting in maintenance
becoming impossible. For a nameplate for a built-in spindle motor,
keep the nameplate with the spindle.

- Do not apply shocks to a motor or cause scratches to it.

If a motor is subjected to shocks or is scratched, its components may
be adversely affected, resulting in normal operation being impaired.
Be very careful when handling plastic portions, sensors, and windings,
because they are very liable to break. Especially, avoid lifting a motor
by pulling its plastic portion, winding, or power cable.

- Do not conduct dielectric strength or insulation test for a sensor.

Such a test can damage elements in the sensor.

- When testing the winding or insulation resistance of a motor, satisfy the

conditions stipulated in IEC34.
Testing a motor under a condition severer than those specified in
IEC34 may damage the motor.

- Do not disassemble a motor.

Disassembling a motor may cause a failure or trouble in it.
If disassembly is in need because of maintenance or repair, please
contact a service representative of FANUC.

- Do not modify a motor.

Do not modify a motor unless directed by FANUC. Modifying a
motor may cause a failure or trouble in it.

- Use a motor under an appropriate environmental condition.

Using a motor in an adverse environment may cause a failure or
trouble in it. Refer to their respective specification manuals for details
of the operating and environmental conditions for motors.

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SAFETY PRECAUTIONS B-65372EN/01

NOTE
- Do not apply a commercial power source voltage directly to a motor.
Applying a commercial power source voltage directly to a motor may
result in its windings being burned. Be sure to use a specified
amplifier for supplying voltage to the motor.

- For a motor with a terminal box, make a conduit hole for the terminal box in a
specified position.
When making a conduit hole, be careful not to break or damage
unspecified portions. Refer to an applicable specification manual.

- Before using a motor, measure its winding and insulation resistances, and make
sure they are normal.
Especially for a motor that has been stored for a prolonged period of
time, conduct these checks. A motor may deteriorate depending on the
condition under which it is stored or the time during which it is stored.
For the winding resistances of motors, refer to their respective
specification manuals, or ask FANUC. For insulation resistances, see
the following table.

- To use a motor as long as possible, perform periodic maintenance and inspection

for it, and check its winding and insulation resistances.
Note that extremely severe inspections (such as dielectric strength
tests) of a motor may damage its windings. For the winding
resistances of motors, refer to their respective specification manuals,
or ask FANUC. For insulation resistances, see the following table.

MOTOR INSULATION RESISTANCE MEASUREMENT

Measure an insulation resistance between each winding and
motor frame using an insulation resistance meter (500 VDC).
Judge the measurements according to the following table.

Insulation
Judgment
resistance
100 MΩ or higher Acceptable
The winding has begun deteriorating. There is no
10 to 100 MΩ problem with the performance at present. Be
sure to perform periodic inspection.
The winding has considerably deteriorated.
1 to 10 MΩ Special care is in need. Be sure to perform
periodic inspection.
Lower than 1 MΩ Unacceptable. Replace the motor.

s-8
B-65372EN/01 PREFACE

PREFACE
The series covered by this manual, and their abbreviations are:

Series Model
αC1/6000i, αC2/6000i, αC3/6000i, αC6/6000i,
αCi series
αC8/6000i, αC12/6000i, αC15/6000i

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B-65372EN/01 TABLE OF CONTENTS

TABLE OF CONTENTS

SAFETY PRECAUTIONS .......................................................................... s-1

PREFACE.................................................................................................. p-1

I. DESCRIPTIONS FOR THE αCi SERIES

1 GENERAL ..............................................................................................3
2 CONFIGURATION OF THE αCi SERIES...............................................4
3 MOTOR TYPES .....................................................................................5
4 NOTES ON INSTALLATION ..................................................................6
4.1 COMMON ......................................................................................................7
4.2 POWER LEAD CONNECTION....................................................................20
4.3 WHEN A MOTOR IS CONNECTED TO A SPINDLE VIA A BELT ..............21
4.4 WHEN A MOTOR IS DIRECTLY CONNECTED TO A SPINDLE VIA A
COUPLING ..................................................................................................24
5 NOTES ON OPERATION.....................................................................25
6 DETERMINING THE ACCELERATION TIME ......................................26
7 DETERMINING THE ALLOWABLE DUTY CYCLE .............................32

II. FANUC AC SPINDLE MOTOR αCi SERIES

1 GENERAL ............................................................................................37
2 SPECIFICATIONS................................................................................38
3 OUTPUT/TORQUE CHARACTERISTICS ............................................42
3.1 MODEL αC1/6000i ......................................................................................43
3.2 MODEL αC2/6000i ......................................................................................43
3.3 MODEL αC3/6000i ......................................................................................44
3.4 MODEL αC6/10000i ....................................................................................44
3.5 MODEL αC8/6000i ......................................................................................45
3.6 MODEL αC12/6000i ....................................................................................45
3.7 MODEL αC15/6000i ....................................................................................46

4 CONNECTIONS ...................................................................................47
4.1 MODELS αC1/6000i TO αC15/6000i ..........................................................47

5 ALLOWABLE RADIAL LOAD..............................................................50

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TABLE OF CONTENTS B-65372EN/01

6 ASSEMBLING ACCURACY.................................................................51
7 EXTERNAL DIMENSIONS...................................................................52
7.1 MODEL αC1/6000i (FLANGE MOUNTING TYPE)......................................53
7.2 MODEL αC1/6000i (FOOT MOUNTING TYPE) ..........................................54
7.3 MODEL αC2/6000i (FLANGE MOUNTING TYPE)......................................55
7.4 MODEL αC2/6000i (FOOT MOUNTING TYPE) ..........................................56
7.5 MODEL αC3/6000i (FLANGE MOUNTING TYPE)......................................57
7.6 MODEL αC3/6000i (FOOT MOUNTING TYPE) ..........................................58
7.7 MODEL αC6/6000i (FLANGE MOUNTING TYPE)......................................59
7.8 MODEL αC6/6000i (FOOT MOUNTING TYPE) ..........................................60
7.9 MODEL αC8/6000i (FLANGE MOUNTING TYPE)......................................61
7.10 MODEL αC8/6000i (FOOT MOUNTING TYPE) ..........................................62
7.11 MODEL αC12/6000i (FLANGE MOUNTING TYPE)....................................63
7.12 MODEL αC12/6000i (FOOT MOUNTING TYPE) ........................................64
7.13 MODEL αC15/6000i (FLANGE MOUNTING TYPE)....................................65
7.14 MODEL αC15/6000i (FOOT MOUNTING TYPE) ........................................66

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I. DESCRIPTIONS FOR THE αCi SERIES
B-65372EN/01 SPECIFICATIONS FOR THE αCi SERIES 1.GENERAL

1 GENERAL
As motors for driving the spindle of a CNC machine tool, the FANUC
AC Spindle Motor αCi series has incorporated accumulated
technologies and employs the latest design and manufacturing
techniques to provide the features listed below.

Features
• The user can select an appropriate motor according to whether
the spindle driving mechanism is belt driving or motor direct
coupling.
• An up-to-date stator cooling method is employed for direct air-
cooling of the electromagnetic steel plate. So, a high power and
high torque are achieved with a compact size.
• By precision rotor aluminum casting and accurate rotor balance
correction, vibration grade V5 is achieved even at high speed.
• The user can select a motor fan exhaust direction: forward
direction or backward direction. An exhaust direction that
subjects the machine to less heat deformation can be selected.
• This series employ waterproof and pressure-proof design
conforming to the international standard (IEC).

αCi series

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2.CONFIGURATION OF THE αCi series SPECIFICATIONS FOR THE αCi SERIES B-65372EN/01

2 CONFIGURATION OF THE αCi series

The FANUC AC Spindle Motor αCi series includes the following
models.

Feature
Example of
Rated output
Series Feature applicable
kW
machine
Lathe system
Economical model based
αCi 1.1 to 15 (suited to belt
on sensor-less control
driving)

Lineup for αi series spindle motor

Continuous
rated output 1.1 2.2 3.7 5.5 7.5 11 15
kW
αC1/ αC2/ αC3/ αC6/ αC8/ αC12/ αC15/
αCi
6000i 6000i 6000i 6000i 6000i 6000i 6000i

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B-65372EN/01 SPECIFICATIONS FOR THE αCi SERIES 3.MOTOR TYPES

3 MOTOR TYPES
Each model includes the types of motors listed below, and the user
can make an optimal choice according to the spindle driving structure.

Item Type Use Remarks

Directly connected to a spindle The motor can be positioned
Flange mounting type
Mounting types Connected to spindle via a belt accurately.
Foot mounting type Connected to spindle via a belt
A shaft with no key is used as
standard to facilitate pulley balance
correction and acceleration/
Shaft figure With no key Connected to a pulley deceleration operation.
When a shaft with a key is needed,
contact your FANUC sales
representative.
Rearward exhaust
(Exhaust from side When the machine is positioned
Cooling air opposite the output at the output shaft side
Direct the exhaust out and away from
exhaust shaft)
the machine.
direction Forward exhaust When the machine is positioned
(Exhaust from the output at the side opposite the output
shaft side) shaft
Used in flange mounting type
Oil seal Direct connection, and belt driving
models.
Output shaft Belt driving
Foot mounting type models have no
seal (Only when no lubricant splashes
No seal output shaft seal, but can be
onto the flange surface of the
changed to a model with an oil seal.
motor)

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4.NOTES ON INSTALLATION SPECIFICATIONS FOR THE αCi SERIES B-65372EN/01

4 NOTES ON INSTALLATION

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B-65372EN/01 SPECIFICATIONS FOR THE αCi SERIES 4.NOTES ON INSTALLATION

4.1 COMMON

Be sure to observe the following, regardless of the connection method

of the motor:
WARNING
When connecting a metallic conduit to a plastic terminal box, connect
the conduit to ground on the power magnetics cabinet side.

CAUTION
1 Mount the motor so that the output shaft points in a direction
ranging within 45° degrees above the horizontal to vertically
downwards.

2 When the motor needs to be pointed to more than 45° degrees

above the horizontal, consult you FANUC representative.

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4.NOTES ON INSTALLATION SPECIFICATIONS FOR THE αCi SERIES B-65372EN/01

3 Use the eyebolt of the motor to lift only a single motor, (pulley
may be attached).

4 Place a cover over an air-cooled motor to prevent the motor from

being exposed to coolant or lubricant.

5 Limit the vibration acceleration at the rear bracket of the motor

to 0.5 G (4.9 m/s2) to ensure the long-term reliability of each part
of the motor.
In particular, to limit the acceleration in the case of direct
connection to 0.5 G, carefully perform centering with the mating
spindle and make the motor shaft parallel with the spindle.

• Details of the measuring method

Measuring instrument:
Equivalent to the VM-3314A or VM-3304 manufactured by
IMV CORPORATION.
Condition:
At the time of highest-speed rotation with no load
Measurement frequency range with no load at the highest speed:
10 to 1000 Hz
Criteria:
0.5 G (4.9 m/s2) or less at the rear bracket
1. Using a pickup
A. Pressing a pickup against B. Screwing a block into the eyebolt
the side of the rear bracket internal thread on the rear
bracket, then screwing a pickup
into the block.

Block

Pickup Pickup
Side of the rear bracket
Eyebolt internal thread

2. Vibration measurement position (rear bracket)

Side of the rear bracket

Eyebolt
internal thread

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B-65372EN/01 SPECIFICATIONS FOR THE αCi SERIES 4.NOTES ON INSTALLATION

6 Dynamic balance
During high-speed operation, a small imbalance may cause a
large vibration, resulting in an unusual sound, premature bearing
damage, or some other abnormality.
Therefore, reduce the amount of the imbalance with the dynamic
balance of the other rotation shafts, as well as the pulley
mounted on the output shaft of the motor, as much as possible.

• Balance correction
With the αCi series, a shaft with no key is used as standard
to facilitate the balance correction of a pulley and coupling
attached to the shaft. Use a completely symmetric pulley or
coupling, and use a backlash-less tightening part such as a
SPANN ELEMENTE to secure a pulley or coupling to the
shaft. When attaching a pulley to a shaft, for example,
adjust the periphery vibration to within 20 µm. This
basically eliminates the need for balance correction. To
further reduce the vibration level, make a field balance
correction, for example, by tightening a screw into the
tapped hole for balance correction provided on a
component such as a pulley.

NOTE
When a shaft with a key is required, contact your
FANUC sales representative.

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4.NOTES ON INSTALLATION SPECIFICATIONS FOR THE αCi SERIES B-65372EN/01

7 Output shaft seal

To prevent cutting lubricant or dust from penetrating inside the
motor (flange mounting type), one of the following output shaft
seals is provided on the output shaft. (For the use and applicable
motors, see Chapter 3, "MOTOR TYPES.")

For those models with an oil seal, ensure that the surface of the
lubricant is below the lip of the oil seal.
If no seal is provided (foot mounting type), ensure that lubricant
does not splash onto the flange surface.

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B-65372EN/01 SPECIFICATIONS FOR THE αCi SERIES 4.NOTES ON INSTALLATION

8 The lid of the terminal box is provided with rubber gasket to

make it waterproof.
Check that the lid has this gasket, then mount it on the terminal
box.

9 The edge of the fauset joint to mount the motor (flange mounting
type) should be chamfered about C1.

10 Please space 30 mm or more between the fan cover and the

partition to keep the cooling ability well.
We recommend to take a structure such as you can clean air
holes and the fan cover easily.

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4.NOTES ON INSTALLATION SPECIFICATIONS FOR THE αCi SERIES B-65372EN/01

11 If much oil mist, dust, or other foreign matter settles on the

motor, the cooling performance is degraded, resulting in
degraded performance of the motor. Design the machine such
that only clean cooling air is drawn into the motor.
Example)
When a duct with a filter is installed on a flange mounting
type motor with a rear exhaust (The filter requires periodic
cleaning.)

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B-65372EN/01 SPECIFICATIONS FOR THE αCi SERIES 4.NOTES ON INSTALLATION

NOTE
1 A foot mounting type motor has no oil seal. When an oil seal is
required, add #0002 to the drawing number of the motor.
Example)
Model αC12/6000i (foot mounting type, with no key,
rearward exhaust)
A06B-1438-B200
A06B-1438-B200#0002 (with oil seal)

2 When the oil seal is not exposed to lubricant, remove the coil
spring of the oil seal to decrease the friction between the lip and
shaft.
There is no problem with dry dust sealing.
If the motor is turned at high speed with the contact section
between the oil seal and shaft being dry, the contact section can
make an abnormal sound (interfering sound), or the lip can be
damaged.

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4.NOTES ON INSTALLATION SPECIFICATIONS FOR THE αCi SERIES B-65372EN/01

3 Cable wiring
Follow the procedure below to install the cable.
(1) Use a hammer to strike the portion for the cable hole on the
terminal box and open the hole.
This time, pay attention not to break the other place except
hole. (In some models, it is not necessary to make a hole.)
(2) Thread the cable through a conduit. Connect the conduit
with the connector. (*1)
(3) Tighten the connector at the cable hole of the terminal box
using a nut. (*2, *3)
(4) Connect each terminal appropriately in the terminal box
with screws.

When a hole once made is not used, purchase the following

rubber bushing and mount it at the hole.

Model Ordering number

αC1i to αC15i A06B-0754-K001

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B-65372EN/01 SPECIFICATIONS FOR THE αCi SERIES 4.NOTES ON INSTALLATION

*1 If a 90° connector is used on any of the following models,

the mounting orientation of its conduit is limited as shown
below to avoid interference between the conduit and motor.
If you want to mount the conduit in any orientation, use a
45° connector. (For any model other than listed below, the
conduit for a 90° connector can be mounted in any
orientation.)
Applicable models : αC12i to αC15i
Conduit mounting orientation for a 90° connector

Conduit mounting orientation for a 45° connector

*2 The nut used to fasten the connector to the terminal box

must be smaller than the size listed below. (Any larger nut
interferes with the terminal box.) For the diameter of the
cable hole in each model, refer to the outside dimension
drawing of the respective models.
Cable hole
Outside diameter e Width t
diameter
φ42.5 mm 53 mm (maximum) 9 mm (maximum)
φ61 mm 80 mm (maximum) 15 mm (maximum)
Outside dimensions of the conduit-connector retaining nut

e t

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4.NOTES ON INSTALLATION SPECIFICATIONS FOR THE αCi SERIES B-65372EN/01

*3 If the connector you want to use is smaller than the cable

hole on the terminal box, prepare the bushing, nut, and O-
ring shown below.
O-ring

Connector

Bushing Nut

Cable hole O-ring code

diameter
JIS B 2401 ISO 3601-1
φD
φ42.5 mm P46 C0462G
φ61 mm P65 C0650G

* For the diameter of the cable hole in each model, refer

to the outside dimension drawing of the respective
models.

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B-65372EN/01 SPECIFICATIONS FOR THE αCi SERIES 4.NOTES ON INSTALLATION

4 Fan motor specification

Select a cable and circuit breaker for your machine tool by
referencing the following lists.
*1 The term "surge current" represents a peak-to-peak current
that flows when the power is turned on.
*2 The values listed below are a rough standard. They are not
guaranteed.

50Hz 60Hz
αCi series Usable Rated Rated Surge Usable Rated Rated Surge
spindle motor models voltage voltage current current voltage voltage current current
[V] [V] [A] [Ap-p] [V] [V] [A] [Ap-p]
αC1i 160-270 240 0.15 0.47 160-270 240 0.12 0.48
αC2i, αC3i 170-240 200 0.10 0.41 170-240 200 0.10 0.40
αC6i, αC8i 170-240 200 0.13 0.50 170-240 200 0.14 0.51
αC12i, αC15 170-240 200 0.22 1.15 170-240 200 0.32 1.10

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4.NOTES ON INSTALLATION SPECIFICATIONS FOR THE αCi SERIES B-65372EN/01

5 Center of gravity
The distance L from the flange end face to the center of gravity
in each model is listed below.

Center
of gravity

αCi series Center of gravity [mm]

αC1/6000i 125±5
αC2/6000i 125±5
αC3/6000i 170±5
αC6/6000i 150±5
αC8/6000i 185±5
αC12/6000i 160±5
αC15/6000i 175±5

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B-65372EN/01 SPECIFICATIONS FOR THE αCi SERIES 4.NOTES ON INSTALLATION

6 Segregated disposal of plastic and metal parts of motors

Before disposing of motors, separate their plastic parts (such as
terminal box, terminal box lid, and fan cover) from the other
parts (metal parts) by disassembling the motors as shown below.
All the plastic parts are made of the following materials:
Plastic: >(PBT+PC)-GF(30)FR(17)<

Terminal box lid

Terminal
box

Fan cover

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4.NOTES ON INSTALLATION SPECIFICATIONS FOR THE αCi SERIES B-65372EN/01

4.2 POWER LEAD CONNECTION

CAUTION
1. To attach power leads to the motor terminal board, fasten them
with the tightening torque listed below.

Terminal size Tightening torque [N⋅⋅m]

M4 1.1 to 1.5
M5 2.0 to 2.5
M6 3.5 to 4.5

2. To maintain the required isolation distance, observe the

following:
• When attaching a crimp terminal at the end of a power lead,
cover the crimped portion of the crimp terminal with
insulating tube.
• If the terminal board is provided with an insulating cover,
fasten the power leads with the screws, and then put back
the insulating cover in place.

- 20 -
B-65372EN/01 SPECIFICATIONS FOR THE αCi SERIES 4.NOTES ON INSTALLATION

4.3 WHEN A MOTOR IS CONNECTED TO A SPINDLE VIA A

BELT

CAUTION
1 Mounting the pulley
• The gap between the inner surface of the motor pulley and
output shaft should be 10µm to 15µm.
• If the gap is large when the high-speed rotation (4500 min-1),
fretting produced at the gap causes a large vibration,
resulting in damage to the motor bearing.
• As the vibration is intensified, fretting occurs in the gap
mentioned above, and the pulley and shaft can stick to each
other.
• To secure a pulley, use a friction-tightening part such as a
SPANN ELEMENTE or clamping sleeve.

NOTE
The SPANN ELEMENTE RfN8006 is manufactured
by RINGFEDER.
The clamping sleeve DSM is manufactured by
SPIETH.

Example 1 Two sets of SPANN ELEMENTE RfN8006 are used.

The collar is pinched at two points by the two sets.

SPANN ELEMENTE

Example 2 Clamping sleeve DSM is used.

Clamping sleeve

- 21 -
4.NOTES ON INSTALLATION SPECIFICATIONS FOR THE αCi SERIES B-65372EN/01

2 After attaching a pulley to the motor, adjust the vibration of the

belt groove to within 20 µm (T.I.R).

3 Before the belt is looped, FANUC recommends that the dynamic

balance (field balance) be corrected.

4 Limit the radial load applied to the motor output shaft by the
tension of the belt to the allowable value described in the manual
for each series. If the allowable value is exceeded, the bearing or
shaft may fail prematurely.

5 The tension of the belt is reduced as a result of abrasion during

the initial several hours of operation. To transfer torque normally
after this reduction in tension, the initial tension before operation
should be set to a value 1.3 times the actually required tension T.

Recommended belts:
Ribace manufactured by BANDO.
Ribstar manufactured by MITSUBOSHI.

- 22 -
B-65372EN/01 SPECIFICATIONS FOR THE αCi SERIES 4.NOTES ON INSTALLATION

6 Use an appropriate tension gage to tension the belt.

Examples Sonic type:
U-305 series manufactured by UNITTA.
Mechanical type:
BT-33 series manufactured by Borroughs of the United
States
A mechanical type tension gage may give a false reading
depending on the belt's number of peaks and length. To
overcome this problem, hang an object of a known weight on the
belt, read the tension value, then adjust the tension gage.

Tension
kgf

Tension gage
Adjustment belt T3
(one unit) Read the value
T2
Tension : T = W/2 kgf
T1

M1 M2 M3
Tension gage scale
Adjustment weight (W kgf)

Radial load applied to the motor shaft (kgf) = tension (T kgf) × 2 × number of belts

7 Reduce the deviation between the positions of the motor and

machine pulleys in the shaft direction as much as possible and
ensure that the center lines of the shafts are as parallel as
possible.

Spindle pulley Spindle pulley

Spindle

Parallelism Pulley positions

Spindle motor

Motor pulley Motor pulley

- 23 -
4.NOTES ON INSTALLATION SPECIFICATIONS FOR THE αCi SERIES B-65372EN/01

4.4 WHEN A MOTOR IS DIRECTLY CONNECTED TO A

SPINDLE VIA A COUPLING

CAUTION
1 Use a coupling which can absorb thermal expansion in the axial
direction of the motor mating shaft so that no load is applied in
the motor axial direction.
(Examples)
• Diaphragm coupling (EAGLE INDUSTRY CO., LTD.)
• Oldham's coupling
• Leaf spring coupling

2 Set the torsional rigidity of the coupling to an appropriate high

value. If the torsional rigidity is low, vibration may be produced
during orientation.

3 It is important to perform centering and obtain parallelism to

avoid having to recourse to the flexibility of the coupling.
At high speeds, any eccentricity may cause the bearing to fail
prematurely.

4 Check all machines before shipping to confirm that the vibration

acceleration is 0.5 G or less when measured using the method
described in CAUTION 5 of Section 4.1.

- 24 -
B-65372EN/01 SPECIFICATIONS FOR THE αCi SERIES5.NOTES ON OPERATION

5 WARNING
NOTES ON OPERATION

1 When supplying voltage to the spindle motor or the fan motor,

ensure that the earth cable is connected to the earth terminal and
secure that the spindle motor is put to earth certainly.

CAUTION
1 Sound and vibration
Check that there is no abnormal sound or vibration.

2 Cooling
Clean off dust from the cooling air inlet and outlet of the stator
every year, and check the flow of air carefully.

NOTE
1 To increase the operating lifetime of a motor of these series,
break in the motor. As a guideline, increase the speed of the
motor from 1000 min-1 to its maximum speed in 1000 min-1
increments, and operate the motor at each speed for about 5
minutes.

- 25 -
6.DETERMINING THE ACCELERATION TIME SPECIFICATIONS FOR THE αCi SERIES B-65372EN/01

6 DETERMINING THE ACCELERATION

TIME
The time required for each acceleration for the acceleration/
deceleration output characteristics shown below can be obtained from
the following equation.
Since machine load torque is not taken into consideration, the actual
time is slightly longer than the calculated time.

Output
[kW]

Acceleration/deceleration output characteristics (Note)

Pf

Pm

0 Speed
Nb Nf Nm
(1) (2) (3)

JL : Load inertia converted for the motor shaft [kg⋅m⋅s2]

Jm : Motor inertia [kg⋅m⋅s2]
Pf, Pm : Output [kW]
Nb, Nf, Nm : Speed [min-1]

NOTE
The 30-minute rated output must be used as the
acceleration output.

- 26 -
B-65372EN/01 SPECIFICATIONS FOR THE αCi SERIES 6.DETERMINING THE ACCELERATION TIME

- Acceleration time (t1) in the constant-torque range (0 to Nb)

(JL+Jm) ×Nb2
t1=0.10754× [sec]
Pf×1000

- Acceleration time (t2) in the constant-output range (Nb to Nf)

(JL+Jm) × (Nf2-Nb2)
t2=0.10754× [sec]
2×Pf×1000

- Acceleration time (t3) in the decreasing-output range (Nf to Nm)

(JL+Jm) × (Nm-Nf) Pf Nm-Pm Nf
t3=0.10754× × {(Nm-Nf) - ×Ln(Pm/Pf)} [sec]
(Pm-Pf) ×1000 Pm-Pf

The total time (t) required for acceleration in the range from 0 to Nm
is t1+t2+t3 [s]
Deceleration can be controlled so that the time required for
deceleration is nearly equal to that for acceleration. When the power
voltage is high, or the impedance of the power is high, the time
required for deceleration may not be made equal to that for
acceleration.

Calculation example
Model αC8/6000i has the acceleration/deceleration output
characteristics shown below.

Output
[kW]
30-minute rated output
= Acceleration/deceleration output

11
7.5

0 Speed
1500 4500 6000[min-1]

In this case, the variables have the following values.

Jm : 0.0028 [kgf⋅m⋅sec2]

NOTE
The rotor inertia is 0.28 [kgf⋅cm⋅sec2] in the αC8/6000i
specifications. When the unit is changed for
calculation, the rotor inertia is 0.28 [kgf⋅cm⋅sec2]/100 =
0.0028 [kgf⋅m⋅sec2]

- 27 -
6.DETERMINING THE ACCELERATION TIME SPECIFICATIONS FOR THE αCi SERIES B-65372EN/01

Pf : 11 [kW]
Pm : 7.5 [kW]
Nb : 1500 [min-1]
Nf : 4500 [min-1]
Nm : 6000 [min-1]

Suppose that JL is 0.0056 [kgf⋅m⋅sec2]. Then the acceleration times

are as follows:

- Acceleration time (t1) in the constant-torque range (0 to Nb)

(0.0056+0.0028) ×15002
t1 = 0.10754× =0.185 [sec]
11×1000

- Acceleration time (t2) in the constant-output range (Nb to Nf)

(0.0056+0.0028) × (45002-15002)
t2 = 0.10754×
2×11×1000
= 0.739 [sec]

- Acceleration time (t3) in the decreasing-output range (Nf to Nm)

(0.0056+0.0028) × (6000-4500)
t3 = 0.10754×
(7.5-11) ×1000

11×6000-7.5×4500
×{(6000-4500) - ×Ln(7.5/11)}
7.5-11
= 0.785 [sec]

The total time required for acceleration in the range from 0 to 6000
min-1 is t1+t2+t3=1.71 [s]

- 28 -
B-65372EN/01 SPECIFICATIONS FOR THE αCi SERIES 6.DETERMINING THE ACCELERATION TIME

Reference 1
When a cylinder rotates about its center axis, its inertia can be
obtained from the following equation.

Q [cm]

L [cm]

πγ
J= Q4L [kgf⋅cm⋅sec2]
32×980

When steel (γ=7.8×10-3 kgf/cm3) is used, the approximate inertia is

obtained from the following equation.
J=0.78×10-6Q4L [kgf⋅cm⋅sec2]

When the unit for J is changed.

J=0.78×10-8Q4L [kgf⋅m⋅sec2]

- 29 -
6.DETERMINING THE ACCELERATION TIME SPECIFICATIONS FOR THE αCi SERIES B-65372EN/01

Reference 2
To obtain the value GD2 [kgf⋅m2] for cylinder, get the value of G from
its weight in kilograms and use the following equation to get the value
of D2.

- Solid cylinder

D0 [m]

D2=D0 /2
2

- Hollow cylinder

D0 [m] D1 [m]

D2=(D0 +D1 )/2

2 2

Use the following equiation to convert GD2 [kgf⋅m2] to J [kgf⋅cm⋅sec2]

J[kgf⋅cm⋅sec2] = GD2 [kgf⋅m2]/4/g×100
= GD2 [kgf⋅m2]/4/9.8×100
= GD2 [kgf⋅m2] ×2.55

NOTE
g indicates the acceleration of gravity :
9.80 [m/sec2].

- 30 -
B-65372EN/01 SPECIFICATIONS FOR THE αCi SERIES 6.DETERMINING THE ACCELERATION TIME

Reference 3
Note the following relationship between the value of inertia I [kg⋅m2]
in SI units and the value of GD2 [kgf⋅m2]:
I[kg⋅m2]=GD2 [kgf⋅m2]/4
Therefore, to convert I [kg⋅m2] to J [kgf⋅cm⋅sec2], use the following
equation:
J[kgf⋅cm⋅sec2] = GD2 [kgf⋅m2]/4/g×100
= I [kg⋅m2]/g×100
= I [kg⋅m2]/9.80×100
= I [kg⋅m2] ×10.2

NOTE
g indicates the acceleration of gravity:
9.80 [m/sec2].

Reference 4

- Difference of inertia
Calculate the inertia of the solid steel cylinder shown in the following
figure.

10 [cm]

20 [cm]

(1) Calculating J [kgf⋅cm⋅sec2]

J = πγ /(32×980) ×Q4×L
= π×7.8×10-3/(32×980) ×104×20
= 0.156[kgf⋅cm⋅sec2]

(2) Calculating GD2 [kgf⋅m2]

G = π/4×102×20×γ
= π/4×102×20×7.8×10-3
= 12.25[kgf]
D2 = D02/2
= 0.12/2
= 0.005[m2]
GD2 = 12.25×0.005
= 0.0613[kgf⋅m2]

- 31 -
7.DETERMINING THE ALLOWABLE DUTY CYCLE SPECIFICATIONS FOR THE αCi SERIES B-65372EN/01

7 DETERMINING THE ALLOWABLE DUTY

CYCLE
When machining requires the spindle to accelerate and decelerate
frequently, the average output per cycle must not exceed the
continuous rated output. The allowable duty cycle for a typical AC
spindle motor can be obtained as shown below.

Duty cycle and average output

Motor
speed

One cycle time Dt

t1 t2 t3 t4 t5

Motor P1 P2 P3 P4 P1
output

P1, P4 : Acceleration/deceleration output [kW]

= 30-minute rated output
Note) This is not a guaranteed value but a guideline.
P2 : Output with no load [kW] (P2=0)
P3 : Cutting output [kW]

2 2 2 2
P1 t1 + P2 t 2 + P3 t 3 + P4 t 4
Average output Pav =
Dt
NOTE This is not a guaranteed value but a guideline.

NOTE
1 Cutting output P3 at motor speed N which is lower
than base speed Nb shall be calculated by the
following equation.
P3=PC × Nb/N [kW] (PC: Actual cutting output)
2 In case that P3 is calculated by the load indicator
voltage, use the following equation.
P3=P1 × L3/10 [kW]
(L3: Load indicator voltage in cutting [V])

- 32 -
B-65372EN/01 SPECIFICATIONS FOR THE αCi SERIES 7.DETERMINING THE ALLOWABLE DUTY CYCLE

Allowable duty cycle time Dt

From the equation for getting the value of Pav[kW].

1
2 2 2 2
Dt= × (P1 t1+P2 t2+P3 t3+P4 t4)
Pav2

Substitute the continuous rated output of the used AC spindle motor

for Pav [kW] in the equation above.
Example)
To obtain the allowable duty cycle when model αC3i accelerates
and decelerates repeatedly without load (P2=P3=0).
• Continuous rated output Pav=Pcont=3.7kW
• Acceleration/deceleration output P1=P4=5.5kW
• Acceleration time t1=3s, deceleration time t4=3s

1
Dt= ×(5.52×3+5.52×3)=13.3 seconds
2
3.7

As shown above, when model αC3i accelerates and decelerates

repeatedly, the allowable duty cycle time is 13.3 seconds.

- 33 -
7.DETERMINING THE ALLOWABLE DUTY CYCLE SPECIFICATIONS FOR THE αCi SERIES B-65372EN/01

Allowable duty cycle time Dt for repeated acceleration/deceleration

Motor
output

Passage
of time t1 t4

Motor
output P4 P1
P1

Passage 1 cycle time Dt

of time

1
Dt= ×P30min2 × (t1+t4)
2
P CONT

Pcont : Continuous rated output

P30min : 30-minute rated output
t1+t4 : Sum of the acceleration and deceleration time

- 34 -
II. FANUC AC SPINDLE MOTOR αCi SERIES
B-65372EN/01 FANUC AC SPINDLE MOTOR αCi SERIES 1.GENERAL

1 GENERAL
The FANUC AC spindle motor αCi series is economical and ideal for
small lathes.

Features
• Economical configuration includes a servo amplifier.
• Waterproof and pressure–proof design conforming to the
international standard (IEC) is employed to improve reliability
and make it resistant to most environments.

- 37 -
2.SPECIFICATIONS FANUC AC SPINDLE MOTOR αCi SERIES B-65372EN/01

2 SPECIFICATIONS

- 38 -
B-65372EN/01 FANUC AC SPINDLE MOTOR αCi SERIES 2.SPECIFICATIONS

Series αCi series

Model
αC1/6000i αC2/6000i αC3/6000i
Item
Cont. rated kW 1.5 2.2 3.7
(HP) (2.0) (3.0) (5.0)
30 min rated kW 2.2 3.7 5.5
Output [15 min]
(*1) (*2) (HP) (3.0) (5.0) (7.4)
S3 40% kW 2.2 3.7 5.5
[60%]
(*3)(*4) (HP) (3.0) (5.0) (7.4)
Cont. rated 11 20 22
Rated current A
30 min rated (*2)
(*5) 14 28 28
S3 40% (*3)
Speed Base speed 3000 1500 1500
-1
min Max. speed 6000 6000 6000
Output torque
(Cont. rated torque at const. rated torque range)
N⋅m 4.77 14.0 23.5
(kgf⋅cm) (48.7) (143) (240)
2
kg⋅m 0.003 0.0078 0.0148
Rotor inertia 2
kgf⋅cm⋅s 0.03 0.08 0.15
Weight kgf 18 27 46
Vibration V5
Noise 75dB(A) or less
Cooling system (*6) Totally enclosed and fan cooled IC0A6
Cooling fan W 17
Mount the motor so that the output shaft points in a direction ranging
Installation (*7) within 45° degrees above the horizontal to vertically downwards.
IMB5,IMV1,IMB3,IMB6,IMB7,IMB8,IMV5
Insulation Class H
Ambient temperature 0 to 40°C
Altitude Height above sea level not exceeding 1000m
Painting color Munsell system N2.5
Type of thermal protection (*8) TP211
Bearing lubrication Grease
Maximum output during acceleration(*9)
2.64 4.44 6.6
kW
Applicable spindle amplifier module SPMC-2.2i SPMC-5.5i
Model αC1/6000i αC2/6000i αC3/6000i

- 39 -
2.SPECIFICATIONS FANUC AC SPINDLE MOTOR αCi SERIES B-65372EN/01

Series αCi series

Model
αC6/6000i αC8/6000i αC12/6000i αC15/6000i
Item
Cont. rated kW 5.5 7.5 11 15
(HP) (7.4) (10) (14.7) (20.1)
30 min rated kW 7.5 11 15 18.5
Output [15 min]
(*1) (*2) (HP) (10) (14.7) (20.1) (24.8)
S3 40% kW 7.5 11 15 18.5
[60%]
(*3)(*4) (HP) (10) (14.7) (20.1) (24.8)
Cont. rated 42 44 56 74
Rated current A
30 min rated (*2)
(*5) 51 56 68 86
S3 40% (*3)
Speed Base speed 1500 1500 1500 1500
-1
min Max. speed 6000 6000 6000 6000
Output torque
(Cont. rated torque at const. rated torque range)
N⋅m 35.0 47.7 70.0 95.4
(kgf⋅cm) (357) (487) (714) (974)
2
kg⋅m 0.0179 0.0275 0.07 0.09
Rotor inertia 2
kgf⋅cm⋅s 0.18 0.28 0.77 0.93
Weight kgf 51 80 95 110
Vibration V5
Noise 75dB(A) or less
Cooling system (*6) Totally enclosed and fan cooled IC0A6
Cooling fan W 20 56
Mount the motor so that the output shaft points in a direction ranging
Installation (*7) within 45° degrees above the horizontal to vertically downwards.
IMB5,IMV1,IMB3,IMB6,IMB7,IMB8,IMV5
Insulation Class H
Ambient temperature 0 to 40°C
Altitude Height above sea level not exceeding 1000m
Painting color Munsell system N2.5
Type of thermal protection (*8) TP211
Bearing lubrication Grease
Maximum output during acceleration(*9)
9.0 13.2 18.0 22.2
kW
Applicable spindle amplifier module SPMC-11i SPMC-15i SPMC-22i
Model αC6/6000i αC8/6000i αC12/6000i αC15/6000i

- 40 -
B-65372EN/01 FANUC AC SPINDLE MOTOR αCi SERIES 2.SPECIFICATIONS

(*1) The rated output is guaranteed at the rated voltage.

(Amplifier input: 200/220/230VAC +10% -15%, 50/60 Hz
±1Hz)
If the input voltage fluctuates, it is possible that the rated output
cannot be obtained even when such fluctuations are within the
allowable fluctuation range.
(*2) The output for αC1/6000i or αC2/6000i is 15 min rated.
(*3) S3 60% for αC1/6000i or αC2/6000i.
(*4) The cycle time is 10 minutes, S3 60%: ON 6 minutes, OFF 4
minutes and S3 40%: ON 4 minutes, OFF 6 minutes.
(*5) The rated current is not a guaranteed value but a guideline for
the maximum current at rated output.
(*6) IC code conforms to IEC 34-6.
(*7) IM code conforms to IEC 34-7.
(*8) Type conforms to IEC 34-11.
(*9) These values are to be used only as guidance for selecting a
power supply module and are not guaranteed.
(*10) Degree of protection:
with oil seal: IP54,
without oil seal: IP40.

- 41 -
3.OUTPUT/TORQUE CHARACTERISTICS FANUC AC SPINDLE MOTOR αCi SERIESB-65372EN/01

3
Reference
OUTPUT/TORQUE CHARACTERISTICS

Calculation for torque

Torque T can be obtained by the following equation.

T[N⋅m]=P[kW]×1000/0.1047/N[min-1]
P[kW]: Motor output
N[min-1]: Motor speed

When the unit of T is [kgf⋅m],

T[kgf⋅m]=P[kW]×1000/1.0269/N[min-1]

- 42 -
B-65372EN/01FANUC AC SPINDLE MOTOR αCi SERIES 3.OUTPUT/TORQUE CHARACTERISTICS

3.1 MODEL αC1/6000i

Output Torque
[kW] [N⋅m]
2.5 8
2.2kW

2 15min, S3 60% 15min, S3 60%

6
Operating zone Operating zone
1.5
4
1 Continuous
Continuous operating zone
operating zone 2
0.5

0 0
0 1500 3000 4500 6000 0 1500 3000 4500 6000
-1 -1
Motor speed [min ] Motor speed [min ]

3.2 MODEL αC2/6000i

Output Torque
[kW] [N⋅m]
5 28

24
4 3.7kW
15min, S3 60%
20
15min, S3 60% Operating zone
3 Operating zone 16
2.2kW
2.2kW 12
2
Continuous 1.8kW
operating zone 8
1
4 Continuous
operating zone
0 0
0 1500 3000 4500 6000 0 1500 3000 4500 6000
60 -1
60 -1
Motor speed [min ] Motor speed [min ]

- 43 -
3.OUTPUT/TORQUE CHARACTERISTICS FANUC AC SPINDLE MOTOR αCi SERIESB-65372EN/01

3.3 MODEL αC3/6000i

Output Torque
[kW] [N⋅m]
8 40
30min, S3 40% 30min, S3 40%
Operating zone Operating zone
6 5.5kW 30

3.7kW
4 20
3.7kW
3.0kW
2 10
Continuous Continuous
operating zone operating zone
0 0
0 1500 3000 4500 6000 0 1500 3000 4500 6000
60 -1 60 -1
Motor speed [min ] Motor speed [min ]

3.4 MODEL αC6/10000i

Output Torque
[kW] [N⋅m]
10 60
30min, S3 40%
30min, S3 40%
Operating zone 50
8 7.5kW Operating zone

40
6 5.5kW
5.5kW
30
4.4kW
4
Continuous 20
operating zone
2
10
Continuous
operating zone
0 0
0 1500 3000 4500 6000 0 1500 3000 4500 6000
60 60
-1 -1
Motor speed [min ] Motor speed [min ]

- 44 -
B-65372EN/01FANUC AC SPINDLE MOTOR αCi SERIES 3.OUTPUT/TORQUE CHARACTERISTICS

3.5 MODEL αC8/6000i

Output Torque
[kW] [N⋅m]
16 80
30min, S3 40% 30min, S3 40%
Operating zone Operating zone
12 11kW 60

7.5kW
8 40
7.5kW
6.0kW
4 20
Continuous Continuous
operating zone operating zone
0 0
0 1500 3000 4500 6000 0 1500 3000 4500 6000
60 -1 60 -1
Motor speed [min ] Motor speed [min ]

3.6 MODEL αC12/6000i

Output Torque
[kW] [N⋅m]
20 120
30min, S3 40% 30min, S3 40%
Operating zone Operating zone
15 90

11kW
11kW
10 60

Continuous 7.5kW
5 operating zone 30
Continuous
operating zone
0 0
0 1500 3000 4500 6000 0 1500 3000 4500 6000
60 -1 60 -1
Motor speed [min ] Motor speed [min ]

- 45 -
3.OUTPUT/TORQUE CHARACTERISTICS FANUC AC SPINDLE MOTOR αCi SERIESB-65372EN/01

3.7 MODEL αC15/6000i

Output Torque
[kW] [N⋅m]
25 150
30min, S3 40% 30min, S3 40%
Operating zone Operating zone
20 18.5kW 120

15kW
15 15kW 90

11kW
10 60
Continuous
operating zone
5 30
Continuous
operating zone
0 0
0 1500 3000 4500 6000 0 1500 3000 4500 6000
60 -1 60 -1
Motor speed [min ] Motor speed [min ]

- 46 -
B-65372EN/01 FANUC AC SPINDLE MOTOR αCi SERIES 4.CONNECTIONS

4 CONNECTIONS

4.1 MODELS αC1/6000i TO αC15/6000i

Cables of primary winding and fan motor are connected to the

terminal block.
Thermistor signal use a connector manufactured by AMP.
The connector housing and the connector are attached to the motor.

Size of screws used in Power lead Fan motor

the terminal
block U,V,W,G FMU,FMV,FMW
Model
αC1/6000i M5 M4
αC2/6000i to αC15/6000i M5 Screw-less terminal block

Cable for the power lead

For the power lead cable specification, refer to "FANUC SERVO
AMPLIFIER αi series DESCRIPTIONS (B-65282EN)".

Cable for the fan motor

The machine tool builder is to prepare the following cable for the fan
motor:

Vinyl heavy-duty power cord JIS C 3312 3-conductor

Conductor: 37/0.26 (2 mm2)
Sheath: PVCφ11
Crimp terminal: T2-4S

<1> For a non-screw terminal block (Peel off each wire sheath on the
motor side by 8 to 9 mm.)
φ11

<2> For an M4 screw terminal block (Attach crimp terminals to the

both ends.)
φ11

- 47 -
4.CONNECTIONS FANUC AC SPINDLE MOTOR αCi SERIES B-65372EN/01

Method of connection
8 to 9mm
Peel-off length of a wire sheath
By using an appropriate tool, peel off each wire sheath by 8 to 9
mm.

Sheath Conductor Screwdriver

Use a flat-blade screwdriver with a blade size of 3.5 × 0.5 mm.
(210-120J (standard type), 210-350J (short type) manufactured
by WAGO)

<3> Connection procedure

Screwdriver <1> Insert the tip of the screwdriver into the screwdriver insertion
<4>
slot (small rectangular hole) until the tip touches the spring. Next,
<1> while tilting the screwdriver toward the inside of the terminal
<2> block, push the screwdriver until it butts the conductive plate. In
this state, the spring is opened completely, and the screwdriver is
held in the terminal block. Ensure that the screwdriver is secured.
Otherwise, the next step (wire insertion) cannot be conducted
easily.
<2> Check the peel-off length (8 to 9 mm), then insert the wire into
the wire insertion slot (large rectangular hole) until it stops, by
sliding the wire along the outer side of the hole slowly so that
the conductor does not become loose. Be careful not to push a
thin wire excessively.
<3> While holding down the inserted wire by one hand, extract the
Conductor
screwdriver. The spring is closed to make a connection.
Spring
<4> By slightly pulling the wire, check that the wire is connected
Conductive plate firmly. The wire need not be pulled intensely.

Cautions
• Only one wire must be connected to one spring.
• A wire, which may be a stranded wire or single conductor, can
be directly connected without performing terminal processing if
its sheath is peeled off. A wire after ferrule processing can also
be connected.

Screwdriver

Non-screw
terminal block Conductor

Non-screw terminal block

(cross section)

Inside the terminal box State of cable connection

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B-65372EN/01 FANUC AC SPINDLE MOTOR αCi SERIES 4.CONNECTIONS

Connector attachment of thermistor signal

Connector pins arrangement
Number B1 B2 B3 B4 B5 B6
Color
THR1
Signal THR2
Number A1 A2 A3 A4 A5 A6
THR2
Color
Signal THR1

- Connector housing and contact specifications

Connector and contact : tyco Electronics AMP specification D-3000
series
Motor side Cable side
FANUC specification AMP specification FANUC specification AMP specification
Housing A63L-0001-0535/121KDF 178964-6 A63L-0001-0460/121KD 178289-6
Contact A63L-0001-0456/ASMT 175288-2 A63L-0001-0456/ASM 1-175217-2
Crimping tool : 91559-1 Extractor : 234168-1

- Thermistor specification
Signal THR1 corresponds to one of the thermistor terminals, and
signal THR2, to the other terminal. The resistance of the thermistor is
about 30 to 90 kΩ as measured at room temperature (20°C to 30°C).

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5.ALLOWABLE RADIAL LOAD FANUC AC SPINDLE MOTOR αCi SERIES B-65372EN/01

5 ALLOWABLE RADIAL LOAD

Use the motor output shaft below the allowable radial loads shown in
the table below.

Allowable radial load (kgf)

Model At output shaft At output shaft
end center
αC1/6000i 392N (40kgf) 441N (45kgf)
αC2/6000i 882N (90kgf) 999N (102kgf)
αC3/6000i 1470N (150kgf) 1607N (164kgf)
αC6/6000i 1960N (200kgf) 2205N (225kgf)
αC8/6000i 2940N (300kgf) 3371N (344kgf)
αC12/6000i, αC15/6000i 2940N (300kgf) 3410N (348kgf)

NOTE
1 When using a belt, adjust the tension so the
allowable loads indicated above are not exceeded.
If an excessive load is applied, consider the use of
a support bearing on the machine side to maintain
the long-term reliability of the motor. (If an
excessive load is applied, it is possible that an
abnormal sound may occur.)
2 When the belt tension is maximized at a point
outside the output shaft end, the allowable loads
are less than those at the output shaft end.
3 Never apply a thrust load.

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B-65372EN/01 FANUC AC SPINDLE MOTOR αCi SERIES6.ASSEMBLING ACCURACY

6 ASSEMBLING ACCURACY
Model
αC1i to αC15i Measuring method
Item

1/2 the output

shaft length
Run-out at the end of the
20µm or less
output shaft

Run-out of the faucet joint

for mounting the flange

10
against the core of the 40µm or less
shaft
(Only for flange type)

Run-out of the flange

mounting surface against
10

80µm or less
the core of the shaft (Only
for flange type)

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7.EXTERNAL DIMENSIONSFANUC AC SPINDLE MOTOR αCi SERIES B-65372EN/01

7 EXTERNAL DIMENSIONS
Model name Section
Model αC1/6000i (flange mounting type) 7.1
Model αC1/6000i (foot mounting type) 7.2
Model αC2/6000i (flange mounting type) 7.3
Model αC2/6000i (foot mounting type) 7.4
Model αC3/6000i (flange mounting type) 7.5
Model αC3/6000i (foot mounting type) 7.6
Model αC6/6000i (flange mounting type) 7.7
Model αC6/6000i (foot mounting type) 7.8
Model αC8/6000i (flange mounting type) 7.9
Model αC8/6000i (foot mounting type) 7.10
Model αC12/6000i (flange mounting type) 7.11
Model αC12/6000i (foot mounting type) 7.12
Model αC15/6000i (flange mounting type) 7.13
Model αC15/6000i (foot mounting type) 7.14

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B-65372EN/01 FANUC AC SPINDLE MOTOR αCi SERIES7.EXTERNAL DIMENSIONS

7.1 MODEL αC1/6000i (FLANGE MOUNTING TYPE)

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7.EXTERNAL DIMENSIONSFANUC AC SPINDLE MOTOR αCi SERIES B-65372EN/01

7.2 MODEL αC1/6000i (FOOT MOUNTING TYPE)

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B-65372EN/01 FANUC AC SPINDLE MOTOR αCi SERIES7.EXTERNAL DIMENSIONS

7.3 MODEL αC2/6000i (FLANGE MOUNTING TYPE)

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7.EXTERNAL DIMENSIONSFANUC AC SPINDLE MOTOR αCi SERIES B-65372EN/01

7.4 MODEL αC2/6000i (FOOT MOUNTING TYPE)

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B-65372EN/01 FANUC AC SPINDLE MOTOR αCi SERIES7.EXTERNAL DIMENSIONS

7.5 MODEL αC3/6000i (FLANGE MOUNTING TYPE)

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7.EXTERNAL DIMENSIONSFANUC AC SPINDLE MOTOR αCi SERIES B-65372EN/01

7.6 MODEL αC3/6000i (FOOT MOUNTING TYPE)

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B-65372EN/01 FANUC AC SPINDLE MOTOR αCi SERIES7.EXTERNAL DIMENSIONS

7.7 MODEL αC6/6000i (FLANGE MOUNTING TYPE)

- 59 -
7.EXTERNAL DIMENSIONSFANUC AC SPINDLE MOTOR αCi SERIES B-65372EN/01

7.8 MODEL αC6/6000i (FOOT MOUNTING TYPE)

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B-65372EN/01 FANUC AC SPINDLE MOTOR αCi SERIES7.EXTERNAL DIMENSIONS

7.9 MODEL αC8/6000i (FLANGE MOUNTING TYPE)

- 61 -
7.EXTERNAL DIMENSIONSFANUC AC SPINDLE MOTOR αCi SERIES B-65372EN/01

7.10 MODEL αC8/6000i (FOOT MOUNTING TYPE)

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B-65372EN/01 FANUC AC SPINDLE MOTOR αCi SERIES7.EXTERNAL DIMENSIONS

7.11 MODEL αC12/6000i (FLANGE MOUNTING TYPE)

- 63 -
7.EXTERNAL DIMENSIONSFANUC AC SPINDLE MOTOR αCi SERIES B-65372EN/01

7.12 MODEL αC12/6000i (FOOT MOUNTING TYPE)

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B-65372EN/01 FANUC AC SPINDLE MOTOR αCi SERIES7.EXTERNAL DIMENSIONS

7.13 MODEL αC15/6000i (FLANGE MOUNTING TYPE)

- 65 -
7.EXTERNAL DIMENSIONSFANUC AC SPINDLE MOTOR αCi SERIES B-65372EN/01

7.14 MODEL αC15/6000i (FOOT MOUNTING TYPE)

- 66 -
B-65372EN/01 INDEX

INDEX
MODEL αC6/6000i (FLANGE MOUNTING TYPE)
<A>
(External dimensions)............................................... 59
ALLOWABLE RADIAL LOAD .................................... 50
MODEL αC6/6000i (FOOT MOUNTING TYPE)
ASSEMBLING ACCURACY ........................................ 51
(External dimensions)............................................... 60
<C> MODEL αC8/6000i (FLANGE MOUNTING TYPE)
COMMON........................................................................ 7 (External dimensions)............................................... 61
CONFIGURATION OF THE αCi SERIES...................... 4 MODEL αC8/6000i (FOOT MOUNTING TYPE)
CONNECTIONS ............................................................ 47 (External dimensions)............................................... 62
MODEL αC8/6000i (Output/torque characteristics) ...... 45
<D>
MODELS αC1/6000i TO αC15/6000i ........................... 47
DETERMINING THE ACCELERATION TIME .......... 26
MOTOR TYPES............................................................... 5
DETERMINING THE ALLOWABLE DUTY CYCLE. 32
<N>
<E>
NOTES ON INSTALLATION ......................................... 6
EXTERNAL DIMENSIONS.......................................... 52
NOTES ON OPERATION ............................................. 25
<M>
<O>
MODEL αC1/6000i (FLANGE MOUNTING TYPE)
OUTPUT/TORQUE CHARACTERISTICS................... 42
(External dimensions)............................................... 53
MODEL αC1/6000i (FOOT MOUNTING TYPE) <P>
(External dimensions)............................................... 54 POWER LEAD CONNECTION .................................... 20
MODEL αC1/6000i (Output/torque characteristics) ...... 43 PREFACE...................................................................... p-1
MODEL αC12/6000i (FLANGE MOUNTING TYPE)
<S>
(External dimensions)............................................... 63
SAFETY PRECAUTIONS .............................................s-1
MODEL αC12/6000i (FOOT MOUNTING TYPE)
SPECIFICATIONS......................................................... 38
(External dimensions)............................................... 64
MODEL αC12/6000i (Output/torque characteristics) .... 45 <W>
MODEL αC15/6000i (FLANGE MOUNTING TYPE) WHEN A MOTOR IS CONNECTED TO A SPINDLE
(External dimensions)............................................... 65 VIA A BELT ............................................................ 21
MODEL αC15/6000i (FOOT MOUNTING TYPE) WHEN A MOTOR IS DIRECTLY CONNECTED
(External dimensions)............................................... 66 TO A SPINDLE VIA A COUPLING....................... 24
MODEL αC15/6000i (Output/torque characteristics) .... 46
MODEL αC2/6000i (FLANGE MOUNTING TYPE)
(External dimensions)............................................... 55
MODEL αC2/6000i (FOOT MOUNTING TYPE)
(External dimensions)............................................... 56
MODEL αC2/6000i (Output/torque characteristics) ...... 43
MODEL αC3/6000i (FLANGE MOUNTING TYPE)
(External dimensions)............................................... 57
MODEL αC3/6000i (FOOT MOUNTING TYPE)
(External dimensions)............................................... 58
MODEL αC3/6000i (Output/torque characteristics) ...... 44
MODEL αC6/10000i (Output/torque characteristics) .... 44

i-1
 Revision Record

FANUC AC SPINDLE MOTOR αCi series DESCRIPTIONS (B-65372EN)

01 Aug., 2003

Edition Date Contents Edition Date Contents