Abstract

This paper substantiates the effectiveness of the analysis of the rotor currents of asynchronous electric drives with frequency control. It is proposed to use spectral analysis of these currents and the main harmonic, as it is the most accurate “display” of slip in an asynchronous motor, as a method for assessing the quality of torque generation in a motor. Modeling and experiments confirm the proposed theoretical hypotheses. These experiments, reflecting the operation of the electric drive with low loads corresponding to a slip of 3% and at a load close to nominal corresponding to a slip of 8–10%, convincingly showed that the algorithm for generating torque implemented in standard frequency converters is not the most optimum solution. A structural solution is proposed that improves the dynamics of the drive by almost twofold, making it comparable to the dynamics of permanent-magnet motors. This solution will allow the use of asynchronous electric drives in high precision technologies.

中文翻译：

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使用转子电流频谱分析评估异步电驱动器控制系统的效率

摘要

本文证实了采用频率控制的异步电驱动器转子电流分析的有效性。建议使用对这些电流和主谐波的频谱分析，因为它是异步电动机中转差的最精确“显示”，作为评估电动机转矩产生质量的方法。建模和实验证实了提出的理论假设。这些实验反映了电驱动器在低负载（对应于滑差3％）和接近标称负载（对应于滑差8-10％）下的运行情况，令人信服地表明，在标准变频器中实现的产生转矩的算法不是最佳的解决方案。提出了一种结构解决方案，可以将驱动器的动态性能提高近两倍，使其可与永磁电动机的动力学相媲美。该解决方案将允许在高精度技术中使用异步电驱动器。