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 article consists of two important topics regarding variable flux memory motors (VFMMs). The first topic is magnetization characteristic analysis of VFMMs having a double-layer permanent magnet (PM). Two-dimensional simulations are executed to clarify relationship between magnetization characteristic and ratio of the 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. The 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), and unintentional demagnetization of VPMs under load condition. The proposed VFMM can overcome the abovementioned 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 fourth-generation over a wide operating range.

Original languageEnglish
Article number9387595
Pages (from-to)3545-3561
Number of pages17
JournalIEEE Transactions on Industry Applications
Volume57
Issue number4
DOIs
Publication statusPublished - Jul 1 2021

Keywords

  • Delta-type permanent magnet (PM) arrangement
  • demagnetization
  • double-layer PM
  • extended flux barrier
  • hybrid magnet
  • symmetric magnetizing current pulse
  • variable flux memory motor (VFMMs)

ASJC Scopus subject areas

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

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