关键词: 永磁同步电机, 滞环电流控制, 电流波动, 输出电压计算

Abstract: Aiming at the problem of large current fluctuation of hysteresis current control ( HCC) for a PMSM, a method of appliing voltage calculation to reduce current fluctuation was proposed. When the current was in the tolerance range of the hysteresis, PI-controlled d,q -axis voltage with discontinuous integration were output, and the integrator only worked when the current change was not wanted. With an appropriate calculation, motor current directly tracked the given value in the tolerance range, and the steady-state fluctuation of the current was small, and will not be affected by the size of tolerance. The problem of PWM output delay in the digital hysteresis calculation method was pointed out. According to the coupling relationship of the three-phase voltage and the center symmetry of the PWM waveform, an execution delay
compensation strategy was proposed. The compensation method was insensitive to system parameters and measurement noise. The performance of the proposed control strategy was demonstrated through simulation and experimental investigations.

Key words: permanent magnet synchronous motor ( PMSM), hysteresis current control ( HCC), current fluctuation, out-voltage calculation