Journal of Electrical Engineering and Technology

The Korean Institute of Electrical Engineers (대한전기학회)
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Thermal Analysis of Interior Permanent-Magnet Synchronous Motor by Electromagnetic Field-Thermal Linked Analysis

  • Lee, Sang-Taek (Dept. of Electronics, Electrical, Control and Instrumentation Engineering, Hanyang University) ;
  • Kim, Hee-Jun (Dept. of Electronics, Electrical, Control and Instrumentation Engineering, Hanyang University) ;
  • Cho, Ju-Hee (Korea Electronics Technology Institute) ;
  • Joo, Dae-Suk (Dept. of Electrical Engineering, Pukyong National University) ;
  • Kim, Dae-Kyong (Dept. of Electrical Control Engineering, Sunchon National University)
  • Received : 2011.11.04
  • Accepted : 2012.08.20
  • Published : 2012.11.01
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Abstract

This paper reports an investigation of pulse width modulation (PWM) techniques for twophase brushless DC (BLDC) motors fed by a two-phase eight-switch inverter in a fan application. The three-phase BLDC motor is widely applied in industry; however, a lower-cost two-phase BLDC motor and drive circuit has been greatly in demand in recent years. In this paper, we introduce a mathematical model of the two-phase BLDC motor with sinusoidal back electromotive forces (EMFs) based on traditional three-phase BLDC motors. To simplify the drive algorithm and speed up its application, we analyze the principle of block commutation for a two-phase BLDC motor drive in the 180-electricaldegree conduction mode, and we further propose five PWM schemes to improve the commutation performance of the two-phase BLDC drive. The effectiveness of the proposed PWM methods is verified through experiments.

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