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DOI QR Code

Optimum Air-Gap Flux Distribution with Third Harmonic Rotor Flux Orientation Adjustment for Five-Phase Induction Motor

  • Kang, Min ;
  • Yu, Wenjuan ;
  • Wang, Zhengyu ;
  • Kong, Wubin ;
  • Xiao, Ye
  • Received : 2017.06.16
  • Accepted : 2017.10.20
  • Published : 2018.01.01

Abstract

This paper investigates optimum air-gap flux distribution with third harmonic rotor flux orientation adjustment for five-phase induction motor. The technique of objective is to generate a nearly rectangular air-gap flux, and it improves iron utilization under variation loading conditions. The proportional relations between third harmonic and fundamental plane currents is usually adopted in the conventional method. However, misalignment between fundamental and third harmonic component occurs with variation loading. The iron of stator teeth is saturated due to this misalignment. This problem is solved by third harmonic rotor flux orientation adjustment simultaneously, and direction and amplitude are changed with mechanical load variation. The proposed method ensures that the air-gap flux density is near rectangular for a maximum value from no load to rated load. It is confirmed that the proposed method guarantees complete both planes decoupling with third harmonic flux orientation adjustment. The effectiveness of the proposed technique is validated experimentally.

Keywords

Air-gap flux;Five-phase induction motor;Third harmonic;Nearly rectangular;Orientation adjustment

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Acknowledgement

Supported by : National Natural Science Foundation of China