Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Flux control of consequent-pole hybrid excitation motors in constant power region to achieve both high efficiency and fast convergence speed

  • Lu, Xingchi (School of Electrical Engineering, Southeast University) ;
  • Fan, Ying (School of Electrical Engineering, Southeast University) ;
  • Chen, Junlei (School of Electrical Engineering, Southeast University) ;
  • Lei, Yutong (School of Electrical Engineering, Southeast University)
  • Received : 2021.05.21
  • Accepted : 2021.10.18
  • Published : 2022.01.20
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Abstract

This paper proposes a new flux control strategy for consequent-pole brushless hybrid excitation (CPBHE) machines to achieve a high efficiency and a fast convergence. Based on an analysis of the mathematical model of a CPBHE machine, a loss model of the CPBHE machine is derived, which demonstrates the feasibility of adopting d-axis flux to search for the optimal efficiency point. Furthermore, to improve the convergence speed of the online search algorithm and to make it suitable for the frequently varying operating conditions of electric vehicles (EVs), an adaptive step search algorithm based on the margin of the voltage limit combined with the offline table lookup method is proposed. Experimental results show that the proposed algorithm can optimize the efficiency of a motor system in the flux-weakening region and that it features a fast optimization process that makes it suitable for EV drives.

Keywords

Acknowledgement

This work was supported by National Natural Science Foundation of China (NSFC) under Project 51877043, Major Project 51991381 and Aeronautical Science Foundation of China under Project 201919069001.

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