内埋式永磁同步电机驱动系统的弱磁控制

针对内埋式永磁同步电机(IPMSM)系统高频运行困难这一问题,提出了一种基于交轴电压的弱磁控制方法.该方法基于磁场定向控制,运用交轴电压控制直轴电流,将交轴电压的期望值与反馈值作差,计算得到弱磁电流误差信号,对其进行PI运算得到弱磁电流.由于在重负载时直流母线电压急剧下降,引入定子空间电压矢量的有效工作时间这一变量来闭环调节所得到弱磁电流,从而实现重负载情况下的弱磁控制.建立了内埋式永磁同步电机系统仿真模型,验证了算法的正确性.将所提出的弱磁控制方法应用变频空调压缩机控制系统中,开发了基于STM32F103R8T6ARM的弱磁控制系统实验平台,实验验证该控制算法可显著提高IPMSM的弱磁转速范围.

Flux-weakening control for interior permanent magnet synchronous motor drive systems

To deal with the difficulty in the high frequency operation of interior permanent magnet synchronous motor (IPMSM) systems, a flux-weakening control method based on q-axis voltage is proposed. On the basis of the field-oriented control, the q-axis voltage is used to control the d-axis current, and the error signal of demagnetization current can be obtained by subtracting the feedback value from the reference value of the q-axis voltage. The demagnetization current can be obtained by using the PI operation of its error signal. To deal with the sharp drop in the DC bus voltage under heavy load, we introduce the effective work-time of the space voltage vector in the closed-loop for regulating the demagnetization current. The system model of IPMSM is built and the validity of the proposed flux-weakening method is verified by the simulation results. The proposed control method is applied in an inverter air-conditioner compressor control system. The experimental platform of flux-weakening control system is developed by STM32F103R8T6 ARM. It is shown that the speed range of IPMSM is extended by the proposed flux-weakening algorithm.