In low-speed sensorless control of surface-mounted permanent magnet synchronous machine (SPMSM), high-frequency (HF) signal injection methods are often used to estimate the rotor position by tracking the motor saliency characterized by the inductances. Cross-saturation effects caused by the load current will influence the inductances, and consequently the saliency, which will introduce position estimation error to the sensorless drive, degrading the drive performance. Such load-dependent position estimation error, which is inherent in HF signal injection sensorless methods, is difficult to be identified by the sensorless algorithm itself. This article proposes a new online method to detect and compensate the load-dependent position estimation error for SPMSM without additional devices or the knowledge of the load-dependent HF inductances. The proposed method can identify effectively the load-dependent position estimation error by simply varying the direction of the current vector. Experimental results are presented to validate the proposed solution.

中文翻译：

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无传感器 SPMSM 驱动器简单有效的在线位置误差补偿方法

在表面贴装永磁同步电机 (SPMSM) 的低速无传感器控制中，高频 (HF) 信号注入方法通常用于通过跟踪以电感为特征的电机凸极来估计转子位置。负载电流引起的交叉饱和效应会影响电感，进而影响显着性，这会给无传感器驱动器引入位置估计误差，从而降低驱动器性能。这种与负载相关的位置估计误差是 HF 信号注入无传感器方法固有的，很难由无传感器算法本身识别。本文提出了一种新的在线方法来检测和补偿 SPMSM 的负载相关位置估计误差，而无需额外的设备或负载相关 HF 电感的知识。所提出的方法可以通过简单地改变电流矢量的方向来有效地识别负载相关的位置估计误差。实验结果被提出以验证所提出的解决方案。