One kind of sensorless control system for brushless DC motor based on DSP was introduced and the principle of back-EMF zero-crossing detection and realization method was discussed in detail.
介绍了反电动势过零位置检测的原理及实现方法，并采用了数字式转速、电流双闭环控制。
They include signal sampling circuit, man-machine interface circuit and control circuit, main chip interface circuit, zero-crossing triggering circuit, and communication circuit, etc.
它们包括信号采样电路、人机接口电路、主控芯片接口电路、过零触发电路及通讯电路等。
In this paper, the control distortion near the zero crossing point is magnified; a method to minimize the distortion is proposed.
本文中，在接近零交叉点附近的控制畸变被放大，提出了一种减小这种畸变的方法。
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