A Study on Characteristic Analysis of BLDC Motor Considering Various PWM Modes

Abstract

Brushless DC motor (BLDCM) is driven by 120 degree square wave voltage and use PWM pulse patterns in two-phase feeding scheme to control the speed. In this paper, we propose the computational method for the BLDCM, which is driven by four PWM modes using time-stepped voltage source finite element method. And then we investigate motor characteristics at each PWM modes. According to a comparison based on each analysis result, we select a better PWM mode in the motor characteristics aspect. We also show that the proposed analysis method is appropriate to analyze a BLDC motor by comparing experimental results.