Improvement in Reliability of Doubly Salient Permanent Magnet Motor Drive

The doubly salient permanent magnet (DSPM) motor is a novel type of AC brushless machine and it offers advantage of high power density, wide speed range and simple structure. To improve the reliability and fault-tolerant performance, a new dual-channel 12/8-pole DSPM motor speed-adjustable system is proposed in this paper. With the comprehensive introduction for the proposed redundant DSPM motor, a close loop control scheme is designed. The motor drive is developed with speed, position and current feedback control using a digital signal processor (DSP) TMS320F2812. The speed and position feedback are obtained from an absolute optical encoder, whereas Hall transducer is implemented to sense the current. The operation performance simulation is conducted based on a prototype DSPM motor and the results show that the dual-channel DSPM motor drive offers higher reliability and better operation characteristics than the traditional single channel motor drive at the same fault condition