基于基波电流观测器和旋转高频电压注入法的IPMSM无传感器控制

为了实现永磁同步电机低速段的高精度无传感器运行,系统地分析了绕组电阻和感应电动势、电流调节器、滤波器、电机暂态运行、注入高频电压的幅值与频率、多凸极效应、电流传感器精度以及A/D采样量化误差等因素对基于旋转高频电压注入法的低速无传感器控制方法转子位置估计精度的影响机理。在此基础上,提出了一种基于基波电流观测器和旋转高频电压注入法相结合的低速无传感器控制策略,消除了传统的无传感器控制方法中带通滤波器引起的转子位置估计误差,并降低了电机暂态运行引起的转子位置估计误差,有效地提高了低速无传感器控制方法的转子位置估计精度。仿真和实验结果表明,所提出的低速无传感器控制策略具有更高的转子位置估计精度和更宽的调速范围。

A new sensorless control strategy combining a fundamental current observer with rotating high-frequency voltage injection method for interior permanent magnet synchronous motor

To achieve permanent magnet synchronous motor low-speed sensorless operation with high accuracy and reliability, this paper systematically studies the performance limits of rotating high-frequency carrier-signal injection-based low-speed sensorless control method, which include the winding resistance and induced electromotive force, current regulators, phase lag of filters, dynamic operation behavior of the motor, the injected high-frequency voltage amplitude and frequency, multiple saliency effects, current sensor accuracy, as well as A/D conversion quantization error. The influence of each factor on the accuracy of the speed and position estimation is discussed. On this basis, a new low-speed sensorless control strategy combining a fundamental current observer with rotating high-frequency carrier-signal injection-based method is proposed to eliminate the rotor position estimation error caused by the traditional band-pass filters, reduce the rotor position estimation error caused by the motor dynamic operation and effectively improve the rotor position estimation accuracy. The simulation and experimental results show that the proposed low-speed sensorless vector control strategy has a higher rotor position estimation accuracy and a wider speed range.