Variable Flux Memory Motor Employing Double Layer Delta-Type PM Arrangement and Large Flux Barrier for Traction Applications

Ren Tsunata, Masatsugu Takemoto, Satoshi Ogasawara, Koji Orikawa

Research output: Contribution to journalArticlepeer-review

Abstract

This paper consists of two important topics regarding variable flux memory motors (VFMMs). First topic is magnetization characteristic analysis of VFMMs having double layer permanent magnet (PM). Two-dimensional simulations are executed to clarify relationship between magnetization characteristic and ratio of double layer PM. In addition, a prototype of a compact size VFMM is fabricated, and experiments are also carried out to investigate accuracy of magnetization characteristic analysis. Second topic is the proposed VFMM employing double layer delta-type PM arrangements and extended flux barriers for traction applications. Conventional VFMMs have three critical issues which are as follows; asymmetric positive and negative magnetizing current pulses; increase in the iron loss due to harmonics caused by demagnetized variable flux PMs (VPMs); unintentional demagnetization of VPMs under load condition. The proposed VFMM can overcome the above problems by employing double layer delta-type PM arrangements and extended flux barriers. In addition, the proposed VFMM achieves much higher efficiency than that of the target motor mounted in TOYOTA Prius 4th-generation over a wide operating range.

Original languageEnglish
JournalIEEE Transactions on Industry Applications
DOIs
Publication statusAccepted/In press - 2021

Keywords

  • Delta-type PM arrangement
  • Double layer PM
  • Extended flux barrier
  • Hybrid magnet
  • Symmetric magnetizing current pulse
  • Variable flux memory motor
  • demagnetization

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering

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