Mazda CX-5 Service & Repair Manual: Electric Power Steering (Eps) Motor

Purpose, Function

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

Construction

• The EPS motor is installed to the steering column with an integrated 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