PS Starter The PS* starter, developed by DENSO in 2001, is 22 percent lighter and 14 percent shorter than the RA starter-- resulting in improved fuel consumption and excellent mountability in the vehicle. A smaller and lighter starter is the result of many "world's first" technologies, such as improving the yoke, employing a segment conductor (rectangular conductor) in the armature coil and improving the armature commutator shape. * PS: Planetary Reduction Segment Conductor Motor

Benefits and Features

• Small size, light weight, easy mountability and low cranking noise.
  • Placing a magnet between the yoke main poles increases the total magnetic flux.
  • Rectangular conductor adopted for the armature coil improves the winding density (space factor).
  • Newly developed surface commutator, placed on the end surface of the armature, reduces the total length of the armature.
  • The deceleration ratio was increased from 4.4 to 7.9, resulting in further reduced size of the motor.
  • Shock absorber is used to absorb the shock of the deceleration device* caused by the increased deceleration ratio.

* The deceleration device decelerates the armature rotational force that rotates the engine’s pinion gear. The PS starter uses the planetary gear as the deceleration device.

Comparison of Amatures

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