On this base, the closed - loop control method of hybrid step motor using the harmonic back EMF is investigated, and the microcomputer control system of step motor is designed.

在此基础上研究了利用谐波反电势信号实现混合式步进电动机闭环控制的方法，设计了步进电动机的微机控制系统。

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In this paper, the closed-loop control method of hybrid step motor using the harmonic back EMF is investigated.

研究了利用谐波反电势信号实现混合式步进电动机闭环控制的方法。

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At startup, there is no back-EMF due to the stationary motor, and the motor position cannot be detected in sensorless mode.

在启动时，没有反电动势，在无传感器模式下电机的位置不能检测到。

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