当旋转磁场电机用作拖动电动机时，转矩的产生和控制就需要得到特殊的考虑。
When rotating-field machines are employed as drive motors, the question of torque generation and control requires special consideration.
介绍一种无速度传感器异步电动机拖动系统的再起动方法。
This paper proposes a restart method for an asynchronous motor drive system without speed sensor.
并提出如何有效地利用电动机来拖动用电设备，提高工作效率。
How to effectively use the motor to drag electric equipment for improving work efficiency is presented.
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