On the basis of AT89C2051 chip,a software method is put forward for the sensorless trapezoidal BEMF BLDCM in the open-loop start-up control.

• 针对具有梯形反电势波形的无位置传感器无刷直流电机(BLDCM)的开环起动控制；提出一种基于AT 89 C2051芯片的软件实现方法.