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SC Alternator447-A

The SC alternator, recently adopted in the Toyota ESTIMA model for the Japanese market, features a new segment conductor made of angular copper wires that enhances power output and efficiency while reducing magnetic noise. It employs a dual winding system to cancel magnetic fluctuations and integrates a compact IC regulator on a single chip. Compared to conventional alternators, the SC alternator is lighter, smaller, and offers improved performance specifications.

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33 views4 pages

SC Alternator447-A

The SC alternator, recently adopted in the Toyota ESTIMA model for the Japanese market, features a new segment conductor made of angular copper wires that enhances power output and efficiency while reducing magnetic noise. It employs a dual winding system to cancel magnetic fluctuations and integrates a compact IC regulator on a single chip. Compared to conventional alternators, the SC alternator is lighter, smaller, and offers improved performance specifications.

Uploaded by

marag65
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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SC Alternator

Here is the SC alternator that has been newly adopted on the ESTIMA
model recently launched by TOYOTA.
(SC: segment conductor) (Only for Japanese Market)

1 Summary
The SC alternator uses a new type of segment conductor consisting of angular copper wires to achieve high power
output in a compact configuration. In addition, the new alternator reduces the magnetic noise by providing the sta-
tor with a dual winding of the coil.

2 Features
Compact, high power output, and high efficiency
Reduced noise level of the alternator

3 Structure
3-1 Structural Diagram

1 SERVICE TECH Vol. 447 00-4


3-2 Segment Conductor (Angular Copper Wire)
The SC alternator has adopted a joined segment conductor system in which segment conductors (angular copper
wires) are inserted and joined, in place of a stator with a winding system. Compared to the conventional type, the
new alternator reduces resistance by one-half and realizes a higher power output and efficiency in a compact con-
figuration.

3-3 Dual Winding


A dual winding system with two sets of three-phase windings are provided to cancel out each other's magnetic
fluctuations that are created at the stator. As a result, the magnetic noise that is generated by the alternator is dra-
matically reduced.

SERVICE TECH Vol. 447 00-4


2
3-4 Rectifier (Diodes)
The rectifier contains 12 diodes to rectify the alternating current that is generated at the stator coil into direct cur-
rent. The diagram below shows how the positive [+] and negative [-] rectifiers (diodes) are connected.

3-5 New Type IC Regulator


In contrast to the conventional IC regulator in which the regulator circuit is
formed on a ceramic board, this regulator integrates the circuit into a single
chip, resulting in a compact configuration.

The IC regulator in the conventional alternator contains transistors on the low side. In contrast, the IC regulator in
the SC alternator contains transistors on the high side.

* A switching element located at the higher potential to the load is called "the high side", and a switching element
located at the lower potential to the load is called "the low side".

3 SERVICE TECH Vol. 447 00-4


4 Specifications
4-1 Comparison of Specifications Between New and Conventional Types
SC Alternator Conventional Type Alternator

Frame outer diameter [mm] 134 137


Overall length (from first groove to cover end) [mm] 132 148
Weight (excluding pulley) [g] 5600 6100
Rated output [A] 130 120
Rated voltage [V] 12

Adjusted voltage [V](5000r/min,10A,115 C) 13.2~14.0


Starting output speed [r/min] 1500maximum 1500maximum
Maximum allowable speed [r/min] 18000

4-2 External Dimension Diagram and Output Characteristics Diagram

4-3 Wiring Diagram

SERVICE TECH Vol. 447 00-4


4

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