This paper proposes a current measurement error compensation method for single current sensor SPMSM drives under low-frequency modulation index operation. When using a single current sensor, two phase currents are sampled and the other phase current is calculated. Since the sampling instants of two-phase currents are separate, the sampled currents cannot represent the motor current at the same instants. Due to this current measurement error, the motor control performance can be degraded. This paper analyzes the impact of the current measurement error and proposes a current measurement error compensation method. Simulation and experimental results are presented to verify the proposed compensation method.

本文提出了一种低频调制指数操作下单电流传感器SPMSM驱动器的电流测量误差补偿方法。当使用单个电流传感器时，对两相电流进行采样并计算另一相电流。由于两相电流的采样时刻是分开的，采样的电流不能代表同一时刻的电机电流。由于这种电流测量误差，电机控制性能可能会下降。本文分析了电流测量误差的影响，提出了电流测量误差补偿方法。仿真和实验结果验证了所提出的补偿方法。