基于高频信号注入法的IPMSM转子位置估算

摘要

To estimate the rotor position of interior permanent magnet synchronous motor (IPMSM) precisely and reliably at low and zero speed range,a high frequency signal injection method was proposed,incorporating the decoupling of saturation saliencies. Based on the basic principle of HF signal injection method,a model which models the behavior of IPMSM with multiple saliencies was built including saturation saliencies. With analysis of saturation saliencies' effects on the rotor position estimation accuracy and system dynamic characteristics,an offline measurement strategy of saturation saliencies was discussed,and then a lookup table was made to decouple the saturation saliencies. The experimental study was implemented on a 3.6 kW IPMSM, and the efficiency and robustness of the procedure was demonstrated through experimental results, showing excellent suppression of the saturation saliencies and good accuracy and reliability of rotor position estimation under both static and dynamic conditions.%为了准确可靠地估算永磁同步电动机在低速及零速下的转子位置,提出了一种包含饱和凸极解耦的高频电压注入法.阐述了高频旋转电压注入法检测内嵌式永磁同步电动机转子位置的基本原理,建立了包含饱和凸极等多重凸极的内嵌式永磁同步电动机数学模型,分析了饱和凸极对转子位置估算精度和系统动态特性的影响,研究了饱和凸极的离线测量方法,在此基础上采用查表法解耦饱和凸极,实现了基于高频注入法的内嵌式永磁同步电动机转子位置估算.实验结果表明,所提出的方法在动态和稳态条件下均能有效抑制饱和凸极的影响,准确可靠地估算出转子位置,且对电机参数不敏感,鲁棒性较高.