Most non-intrusive induction motor (IM) efficiency estimation methods rely on the machine slip to compute the output power and the efficiency. To achieve the overall non-intrusive nature of the entire process, it is vital to utilize a reliable and non-intrusive rotor speed measurement technique in order to obtain the slip of an in-service motor. A number of rotor speed estimation techniques have been proposed in literature. This article focusses on the review and analysis of different techniques in terms of intrusiveness, relative accuracy, sensitivity and computational overhead particularly when the IM is fed by an inverter supply. An experimental accuracy and sensitivity analysis of some motor current and vibration-based techniques is carried out to check the accuracy trends reported in literature and the robustness of these techniques. Potential techniques for non-intrusive rotor speed estimation of inverter-fed induction motors are recommended.

中文翻译：

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逆变感应电机非侵入式转子速度估算技术分析


大多数非侵入式感应电机 (IM) 效率估算方法依靠机器滑差来计算输出功率和效率。为了实现整个过程的整体非侵入性，至关重要的是利用可靠且非侵入式的转子速度测量技术来获得运行中电机的滑差。文献中已经提出了许多转子速度估计技术。本文重点从侵入性、相对精度、灵敏度和计算开销方面对不同技术进行回顾和分析，特别是当 IM 由逆变器电源供电时。对一些基于电机电流和振动的技术进行了实验精度和灵敏度分析，以检查文献中报告的精度趋势以及这些技术的稳健性。推荐了用于逆变器供电感应电机的非侵入式转子速度估计的潜在技术。