Freely Looking for Phase-change Point and Chopping Speed-adjustment of BLDC motor by Using Terminal Voltage Comparison Method

A plan of freely looking for phase-change point and chopping speed-adjustment of BLDC motor was proposed by using terminal voltage comparsion with software algorithm.A key problem of sensorless BLDC motor control which is recognizing the position of the rotor was solved.An advanced digital control system based on PIC6C72 single-chip processor and software chopping speed-adjustment were realized.