2016 – MX-5 – Steering

ELECTRIC POWER STEERING (EPS) MOTOR

Purpose, Function

• The EPS motor is driven by the control current from the EPS Control Module (CM) and generates assist torque to manual steering mechanism.

Construction

• The EPS motor is installed to the steering gear housing and integrated with the EPS CM.

• The EPS motor is a brushless motor which consists of a three-phase star-connected stator, a permanent magnet rotor, and resolver sensor.

  

Operation

• Current flows from the EPS CM to the stator to rotate the motor axis which is integrated with the rotor.

• A resolver sensor for detecting rotation angle is built into the EPS motor and outputs a motor rotation angle signal to the EPS CM.

• The EPS CM switches the current flowing to each stator based on the rotation angle signal from the resolver sensor.

Fail-safe

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