University of Southeastern Philippines
Tagum-Mabini Campus
BACHELOR OF SCIENCE IN AGRICULTURAL AND BIOSYSTEMS
ENGINEERING
ELECTRIC MOTOR
Laboratory Report No.2
Proponent:
CANLUBO, Hanna Rebecca D.
2E-B
Engr. Ronie O. Lusares, MSe
Power Engineering
February 17, 2020
INTRODUCTION
Introduction
Electric motors provide the driving power for a large and still increasing part
of our modern industrial economy. The range of sizes and types of motors is large
and the number and diversity of applications continues to expand. All around us
there are electrical devices that move things around.
The flexibility of electric motors and generators and the possibility of
transmitting electric power from place to place makes the use of electric motors in
many drive mechanisms attractive. Even in situations in which the prime mover is
aboard a vehicle, as in diesel-electric locomotives or passenger ships, electric
transmission has displaced most mechanical or hydraulic transmission. As well,
because electric power can be delivered over sliding contacts, stationary power
plants can provide motive power for rail vehicles. The final drive is, of course, an
electric motor.
The expansion of the use of electric motors’ industrial, commercial and
consumer applications is not at an end. New forms of energy storage systems,
hybrid electric passenger vehicles, and other applications not yet envisioned will
require electric motors, in some cases motors that have not yet been invented.
Objectives
In the conduct of the laboratory experiment, it is encouraged that the student
should meet the following objectives to evaluate their knowledge through the
application of some concepts.
1. To compare and test electric motors.
METHODOLOGY
Materials Needed:
The following are the materials needed to conduct the laboratory experiment
are the following:
Basic tools (screwdrivers, hammers, wrenches)
Electric Motor
Electrical Wire
Procedures:
Disassembling an Electric Motor
1. Remove the fan protective cover. Usually the cover is not screwed with
screws on housing but it's just plugged on housing.
2. Put all removed parts of motor in one box so you don't lose them.
3. After detaching motor fan remove clamp from axis.
4. Mark the position of individual covers, on the side of covers (usually we put
numbers 1, 2, 3 on side of covers, so we will know to assemble it).
5. Unscrew the screws securing the cover. Remove the cover of motor and
put it in the box with other parts.
6. Unscrew the screws securing the front cover (as you've done 2 steps
before). Gently remove the front cover with rotor out of main housing and
put it in the box with other parts.
7. Unscrew the screws securing the top cover. Remove the top cover and
sealing and put it in the box with other parts.
8. Take few pictures of electrical installation and remove all the wires and
electrical clips. Remove capacitor.
Motor Inscription Board
1. Write down all information from inscription board. It is located on motors
housing. There is some useful information on it (voltage, current, number of
turns per minute, capacitor...)
Motor Testing
1. Use an appropriate testing device to test the voltage, ampacity, rpm. and
sound level of the electric motor.
2. Record a change of the results for five-times and get the average.
3. Determine the rotation of the motor.
Rewiring
1. Use the board of electric information located at the motor to determine the
wiring system.
2. Alter the wiring of the two to change it rotation.
3. Repeat motor testing.
.
RESULTS AND DISCUSSIONS
Data Analysis
Table 1. ½ Hp Electric Motor Nameplate Details
Electric Motor Type Single Phase Induction Motor
Horsepower 1/2 HP
Voltage 220 V
Frequency 60 Hz
Ampacity 4.4 A
RPM 1720 rpm
Pole 4
KW 37
Heat 60 °C
Class E
Date 2004
Table 2. ½ Hp Electric Motor using Analog Clamp Meter - Unloaded
Test 1 Test 2 Test 3 Average
Amperage 3.7A 3.8A 4.3A 3.93V
Voltage 210V 220V 215V 215V
Table 3.3 Hp Electric Motor Tesing – Unloaded
A.1. Clockwise Motion
Trials RPM Sound Level Sound Level with
(at 0.1524 m) respect to
individual’s ear
(at 0.4572m)
Test 1 1797.6 r/min 74.9 Db 75.7 dB
Test 2 1797.8 r/min 73.5 Db 80.9 Db
Test 3 1798.2 r/min 74.2 Db 76.3 Db
Test 4 1797.6 r/min 76.5 Db 74.9 Db
Test 5 1790.2 r/min 78.8 Db 76.6 Db
Average 1796.48 r/min 75.58 Db 76.88 dB
Table 4. ½ Hp Electric Motor Tesing – Unloaded
A.1. Counter-clockwise Motion
Trials RPM Sound Level Sound Level with
(at 0.1524 m) respect to
individual’s ear
(at 0.4572m)
Test 1 1797.2 r/min 80.5 Db 81.2 dB
Test 2 1708.1 r/min 79.6 Db 80.6 Db
Test 3 1792.4 r/min 79.2 Db 80.9 Db
Test 4 1793.0 r/min 80.4 Db 81.5 Db
Test 5 1793.8 r/min 79.2 Db 80.8 Db
Average 1776.9 r/min 79.78 Db 81 Db
Discussions
Efficiency results concern only the motors tested. In most cases, lower
value than the actual laboratory test result figures are usually stamped on the
nameplate because this value can change slightly due to factors like
manufacturing tolerances, motor temperature, and voltage variations. However,
each motor nominal nameplate efficiency had a minimum associated (allowance
for variation of 20 % of losses) for variations in materials, manufacturing processes
and tests results and measured actual full-load efficiency had to be not less than
this minimum. The rotation of the motor also varies. The actual rotation of the motor
gives a higher result compared when it is rewired and rotation is change.
CONCLUSION
The experiment proves that there is a slight difference on the declared value
of electric motor to the actual value if tested. This values can either exceed to
minus the stated amount. Many factors are involved to the difference of result,
example is motor temperature ad manufacturing tolerance.
