Efficient Commutation and Torque Ripples Minimization in BLDC Motor for Hoist Applications

摘要

Brushless dc motors rotor has permanent magnet which rotate around fixed armature. The current in armature is commutated to give rise to rotation. The commutation angle error reduces the efficiency and performance of the motor. The back EMF waveforms are taken based on the relationship between commutation point shift and the difference of the dc-link current. Based on these relationships the analysis is made under ideal, advanced and delayed commutations resulting in the reduction of the commutation phase shift errors. The self-compensation method of deviation in the commutation eliminates the impact caused by commutation ripple by delaying the commutation angle by 10° thereby improving the dynamic performance and control thus attaining fast convergence speed, current, voltage and torque.