Practical implementation schemes of motor speed measurement by magnetic encoder on Electric Power Steering applications

In this study, a new perspective yet practical method is proposed for measuring speed of an Electric Power Steering (EPS) drive motor by using a magnetic encoder. The reason that the EPS system measures the speed of a motor is not only to check the speed of the motor, but also to perform control logic of the motor based on the measured speed. Thus, it is important to measure the speed of a motor at each predetermined cycle without changing the speed of the measurement cycle. In this paper, feasible implementation schemes are recommended to improve the performance of a motor speed measurement method based on the M/T method without using additional devices. After the implementation schemes are discussed in detail, their effectiveness will be indicated with further experimental results.