关键词: 五相永磁同步电机, 反电动势非正弦, 转矩给定前馈补偿, 直接转矩控制, 容错

Abstract:

In order to improve the reliability of the direct torque control system of the five-phase permanent magnet synchronous motor (PMSM) with back electromotive force (EMF)as non-sinusoidal wave. Based on the mathematical model of no fault, the output voltage vector of the remaining four phases inverter bridge was reconstructed, and a direct torque control (DTC) strategy was studied, which realizes the direct control of the fundamental torque and the 3rd harmonic current. In the principle of reducing the torque ripple of the motor, the torque ripple caused by non decoupling was overcome by the method of adding torque feedforward compensation. The experimental results show that the motor can run smoothly under the condition of any one phase winding open circuit, and it can be switched from the failure-free operation to the fault-tolerant operation.

Key words: five-phase permanent magnet synchronous motor (PMSM), non-sinusoidal back electromotive force, torque feedforward compensation, direct torque control (DTC), fault-tolerant