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首页> 外文会议>International Symposium on Advanced Electromechanical Motion Systems >External search coil as a means of measuring rotor speed of an induction motor
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External search coil as a means of measuring rotor speed of an induction motor

机译：外部搜索线圈作为测量感应电机转子速度的手段

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The study in this paper investigates whether the air gap harmonics can be identified by using an external search coil placed on the frame of an induction motor. For this purpose the study focuses on the prediction of rotor speed of an induction motor from external search coil emf, using spectral analysis techniques. In the first stage of the study the type of search coil which maximizes the induced emf is sought, also the position of the coil on the induced emf is investigated. Several motors are tested with a sinusoidal supply as well as a PWM inverter power supply and the search coil voltage is sampled. FFT analysis of the recorded data is performed in Matlab environment. An algorithm is developed for identifying the rotor speed using the FFT analysis results. It is shown that the developed algorithm is capable of predicting the motor speed under various load conditions and motor speeds. The speed estimation accuracy of this approach is also discussed. In short, this paper illustrates that the induced emf in an external search coil contains information on air gap harmonics, and these harmonics can be identified even when the motors are supplied with a PWM inverter.
机译：本文的研究调查了是否可以通过使用放置在感应电动机框架上的外部搜索线圈来识别空气隙谐波。为此目的，研究专注于使用光谱分析技术从外部搜索线圈EMF预测感应电动机的转子速度。在研究的第一阶段，寻求最大化诱导的EMF的搜索线圈的类型，还研究了线圈在诱导的EMF上的位置。用正弦供应测试多个电动机以及PWM逆变器电源，并采样搜索线圈电压。记录数据的FFT分析在MATLAB环境中执行。开发了一种算法，用于使用FFT分析结果识别转子速度。结果表明，发达的算法能够在各种负载条件和电动机速度下预测电动机速度。还讨论了这种方法的速度估计准确性。简而言之，本文说明了外部搜索线圈中的感应EMF包含有关气隙谐波的信息，并且即使当电动机提供PWM逆变器时，也可以识别这些谐波。

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