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Here, the principle of counter EMF is introduced as well as a new program of counter EMF and its modified model analyzed. 在此介紹反電勢法的原理，分析一種新的反電勢方法和改進模型。
Using the motor control special chip ML4428, the counter electromotive force detection and back-EMF commutation were realized. 所設計的無刷直流電機穩速控制系統用電機控制專用芯片ML4428實現了反電勢的檢測、換相和功率敺動；