中文摘要：

为提高电机驱动系统的可靠性,利用相量法对多相故障态的转矩脉动进行分析,得到综合脉动转矩相量的幅值及其变化规律。根据功率守恒原则,提出最优电流直接控制策略。该算法保证电机的绕组或功率管发生一相、两相及三相故障时,包括短路、断路及其组合故障,系统可分别输出100%、80%及60%的额定功率,转速不变,转矩脉动最小化输出,进而实现高输出性能的强容错控制。通过一套750 W六相十极永磁容错电机及其控制系统的多相故障态试验,证明了最优电流直接控制策略的正确性及可行性。

英文摘要：

In order to improve the reliability of the drive system,under the analysis of torque ripple in multi-phase faults mode with the phasor method,the amplitude and its variation of the generalized phasor of pulsating torque were got.According to the principle of power conservation,an optimal current direct control（OCDC） strategy was presented.The control method can make the drive system output 100%,80% and 60% of rated torque with torque ripple minimization,when one-phase,two-phase and three-phase faults including the 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） and its control system were tested in multi-phase faults mode.The experimental results validate the optimal current direct control strategy.