Design for fault tolerant permanent magnet motor control system

摘要

In order to improve the reliability of motor drive system, torque ripple in multi-phase faults mode was analyzed with the phaser method. On the basis of the law of power conservation, an optimal current direct control strategy was put forward. The algorithm can make the system export 100%, 80% and 60% of the rated power respectively with torque ripple minimization and keep the speed constant,when one-phase, two-phase or three-phase faults including open-circuit fault, short-circuit fault and their combinations occur in the windings or power devices. All these characteristics realize the strong fault-tolerant capacity with high output performance. A 750 W six-phase ten-pole fault tolerant permanent magnet motor (FTPMM) is designed and its control system was tested in multiphase faults mode.