Considering the BEMF very little in the process of motor starting, the Back-EMF method is expired, combined with the rotor pre-setting method and the variable -frequency increase-voltage method, this paper realizes the open-loop start of motor using DSP.

• 针对电机起动时反电势比较小,很难通过反电势法来检测转子位置的情况,本文结合“预定位法”和“变频升压”的电机启动方式,利用DSP实现电机的开环软启动。