摘  要：应用磁场理论、高等数学和人机交互软件，对三相异步电动机和单相异步电动机为什么会产生“自转”，而与单相异步电动机工作原理非常相似的二相交流伺服电动机却为什么不会产生“自转”的原因进行了详尽的研究。
关键词：“自转”；脉振磁场；三相异步电动机；单相异步电动机；交流伺服电动机；转差率；转子电阻

Abstract: Applying magnetic field theory and  higher mathematics and human-computer interaction software, the reasons why three-phase asynchronous motor and single-phase asynchronous motor can “autorotate” in the pulsating magnetic field, but AC servo motor, operating principle of which is similar to that of single-phase asynchronous motor, cannot be studied in detail. Besides, the author put forward the statement “elimination of AC servo motor ‘autorotation’” is defective.
Key words: autorotation; pulsating magnetic field; 3-phase induction motor; single-phase asynchronous motor; AC servo motor; slip