同步磁阻电动机改进高频注入位置估算算法研究

doi:1004-7018(2019)04-0043-05

摘要/Abstract

摘要：

现有基于高频信号注入的同步磁阻电动机位置估算算法,在反馈信号的处理过程中,若不考虑由采样电路及A/D转换环节产生的相位滞后,会使反馈信号中有效信号占比减小甚至为零,降低算法精度和稳定性。针对上述问题,建立高频下的同步磁阻电动机方程,分析脉振高频电压信号注入d轴后,反馈有效信号衰减的因素,及对位置估算算法有效性和稳定性产生的影响。对由于多种因素产生的反馈信号相位滞后问题,引入d轴在注入频率点的高频电流信号的改进算法,避免需要进行反馈信号相位补偿的问题。通过理论分析可以证明,相比未考虑相位补偿的原高频注入法,该方法提高了反馈信号的信噪比,减小了跟踪误差。结合仿真和实验,对改进方法的有效性进行验证。

关键词: 同步磁阻电动机, 转子位置估算, 无位置传感器控制, 高频信号注入法

Abstract:

The existing position sensorless algorithm for SRM (synchronous reluctance motor) based on HFSI (high-frequency signal injection) does not consider the phase lag generated by the sampling circuit and the A/D converter module during the processing progress of the feedback signal. In the filtered signal, the modulus of effective signal is reduced or even zero, which reduced the accuracy and stability of the original algorithm. In order to solve the problem, the high-frequency synchronous reluctance motor equations was established. The factors that cause the attenuation of the feedback signal in the signal extraction process of existing methods were evaluated. An improved signal processing progress was proposed, which uses the high-frequency current signal of the d-axis at the injection frequency point to replace the sinusoidal signal generated by the system in the original method to avoid calculating the phase lag. Through theoretical analysis, it can be proved that the proposed method improves the signal-to-noise ratio of the tracking signal and reduces the tracking error compared with the original high-frequency injection method without considering the phase compensation. Combined with simulation and experiment, the effectiveness of the method was verified.

Key words: synchronous reluctance motor, rotor position estimation, sensorless control, high-frequency signal injection

中图分类号:

TM341
TM352

杜逸康,廖勇,李福,林豪. 同步磁阻电动机改进高频注入位置估算算法研究[J]. 微特电机, 2019, 47(4): 43-47.

DU Yi-kang,LIAO Yong,LI Fu,LIN Hao. Research of Improved Position Estimation Algorithm Based on High-Frequency Signal Injection for Synchronous Reluctance Motor[J]. Small & Special Electrical Machines, 2019, 47(4): 43-47.

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