Influence of Inverter Switching Conditions on PMBLDC Motor Performance

Abstract

Permanent Magnet Brushless DC (PMBLDC) motors are generally powered bya conventional three-phase voltage source inverter (VSI) or current source inverter(CSI) which is controlled using rotor position. By varying the commutation(switching) angles of the transistors in the inverter circuit, the performance of thesemotors could be greatly varied. This can studied in this paper using the dynamicmotor model, which was performed using Matlab/Simulink software package. Astudy on the influence of switching angles on motor performance shows that themotor operates better when advancing the switching angle, and there is certainangle at which the motor operates with the highest efficiency. An improvement ofthe different operating characteristics of PMBLDC motor has been accomplishedby adjusting the chosen set of the switching angles and using appropriateconduction angles.