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针对感应电动机串级调速系统转子位置检测器存在的缺点，提出了基于近似积分原理工作的转子位置检测器的工作原理，其幅值系数、附加相角变化小，实验效果及工业运行实验结论可靠。
Aiming at the shortcomings of rotor position detector of induction motor cascade speed control system, the working principle of rotor position detector based on approximate integral principle is proposed. The experimental results and experimental results of industrial operation of the rotor position detector with small change of amplitude coefficient and additional phase angle reliable.