Realization of high precision multi-coils-motor

Improving a torque ripple is one of the major challenges in the field of motors. There are several causes of a torque ripple. This paper focuses on an element value variation of a stator coil caused by a manufacturing defect. Based on a noise shaping dynamic element matching (NSDEM) technique to reduce the influence of variations by shuffling driving elements, a dynamic three-phase multi-coils-motor matching (DTMM) technique was proposed that shuffles the whole driving elements in a motor to reduce torque ripple. The results show that the proposed system reduces the torque ripple by 10% compared to the conventional driving technology.