Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)

The Korean Institute of Electrical Engineers (대한전기학회)
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Evaluation of Trapezoidal PWM Inverter using a new Harmonic Torque Factor

새로운 고조파 토오크 평가함수에 의한 Trapezoidal PWM 인버터의 평가

  • Lee, Chi-Hwan (Dept. of Electronics, Kyungpook National University) ;
  • Koo, Bon-Ho (Dept. of Electronics, Kyungpook National University) ;
  • Kwon, Wu-Hyen (Dept. of Electronics, Kyungpook National University)
  • Published : 1987.07.03
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Abstract

In this paper, a new Harmonic Torque Factor(HTF) that represents torque ripple of induction motor is proposed. Trapezoidal PWM is analyzed to torque ripple by HTF and than we obtain optimum triangular factor at some carrier ratio. Six-step, sinusoidal PWM and Trapezoidal PWM are compared and evaluated for choosing a good control strategy of PWM inverter. It turns out that six-step inverter is better than sinusoidal PWM and Trapezoidal PWM when their carrier ratio is 9, and Trapezoidal PWM is superior to sinusoidal PWM. At induction motor is driven by PWM inverter, torque ripples are investigated by computer simulation using d-q two axis model. It is proved that a new Harmonic Torque Factor ix valid.

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