KIEE International Transaction on Electrical Machinery and Energy Conversion Systems

The Korean Institute of Electrical Engineers (대한전기학회)
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Analysis of Voltage Stress in Stator Windings of IGBT PWM Inverter-Fed Induction Motor Systems

  • Hwang Don-Ha (Machine Control & Application Research Group, Korea Electrotechnology Research Institute) ;
  • Lee Ki-Chang (Machine Control & Application Research Group, KERI) ;
  • Jeon Jeong-Woo (Machine Control & Application Research Group, KERI) ;
  • Kim Yong-Joo (Machine Control & Application Research Group, KERI) ;
  • Lee In-Woo (Industrial Performance Group, Hyosung Company) ;
  • Kim Dong-Hee (Dept. of Electrical Engineering, Yeungnam University)
  • Published : 2005.03.01
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Abstract

The high rate of voltage rise (dv/dt) in motor terminals caused by high-frequency switching and impedance mismatches between inverter and motor are known as the primary causes of irregular voltage distributions and insulation breakdowns on stator windings in IGBT PWM inverter-driven induction motors. In this paper, voltage distributions in the stator windings of an induction motor driven by an IGBT PWM inverter are studied. To analyze the irregular voltages of stator windings, high frequency parameters are derived from the finite element (FE) analysis of stator slots. An equivalent circuit composed of distributed capacitances, inductance, and resistance is derived from these parameters. This equivalent circuit is then used for simulation in order to predict the voltage distributions among the turns and coils. The effects of various rising times in motor terminal voltages and cable lengths on the stator voltage distribution are also presented. For a comparison with simulations, an induction motor with taps in the stator turns was made and driven by a variable-rising time switching surge generator. The test results are shown.

Keywords

References

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