Brushless DC motor based on short-time pulse injection method for precise positioning of rotor and smooth switching strategy

摘要

Aim at the starting problem of the sensorless brushless DC motor, sensorless brushless DC motor based on the Matlab/Simulink studies the startup process, and puts forward an optimization scheme. According to the motor stator core saturation effects, with simultaneous input of 6 short-time pulse detection method of rotor position, and then determine the phase sequence to be driven, applied to the motor winding time of 2 different pulses to the motor testing and accelerated. To address motor synchronous switching, average method is used to switch the acceleration phase commutation time correction as the first time after commutation time to achieve smooth handoff to back EMF the motor running and for obtaining accurate rotor position during the synchronization phase, based on linear voltage-difference detection against zero electric potential. Experimental results show the feasibility of the start programme, to achieve reliable starting of brushless DC motor without position sensor.