Several heuristic procedures to estimate the rotor position of interior permanent magnet synchronous motors (IPMSM) via signal injection have been reported in the application literature, and are widely used in practice. These methods, based on the use of linear time-invariant (LTI) high-pass/low-pass filtering, are instrumental for the development of sensorless controllers. To the best of authors’ knowledge, no theoretical analysis of these methods has been carried out. The objectives of this note are (i) to invoke some recent work on the application of averaging techniques for injection-based observer design to develop a theoretical framework to analyse the LTI filtering used in sensorless methods and (ii) to propose a new method that on the one hand ensures improved accuracy and on the other hand can be related to the current filtering technique. An additional advantage of the new method is that it relies on the use of linear operators, implementable with simple computations. The effectiveness of the proposed scheme is assessed by experiments on an IPMSM platform driven by a 521 V DC bus with a 5-kHz pulse-width modulation.

中文翻译：

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一种基于信号注入的内部永磁同步电动机位置估计的新方法

在应用文献中已经报道了几种通过信号注入来估计内部永磁同步电动机（IPMSM）的转子位置的启发式方法，并且在实践中得到了广泛的应用。这些方法基于使用线性时不变（LTI）高通/低通滤波，对于无传感器控制器的开发非常有用。据作者所知，尚未对这些方法进行理论分析。本说明的目的是（i）调用平均技术在基于注入的观测器设计中的应用的最新工作，以开发理论框架来分析无传感器方法中使用的LTI过滤，以及（ii）提出一种新方法，一方面确保提高的准确性，另一方面可以与当前的滤波技术相关。新方法的另一个优点是，它依赖于可通过简单计算实现的线性运算符。通过在具有5 kHz脉宽调制的521 V DC总线驱动的IPMSM平台上进行实验，评估了所提出方案的有效性。