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。
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.
在作大厚度切割时，变频跟踪应适当调慢，最好从零位起调至切割稳定，电流表指针不再激烈晃动。
When advancing large thickness cutting, frequency tracking shall be properly adjusted slow, you'd better adjust it to stable cutting from zero position and ammeter pointer no longer shakes sharply.
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