Design Methodology for Variable Leakage Flux IPM for Automobile Traction Drives

Takashi Kato, Masanao Minowa, Hiroki Hijikata, Kan Akatsu, Robert D. Lorenz

Research output: Contribution to journalArticlepeer-review

47 Citations (Scopus)


This paper presents a novel methodology for the variable leakage flux interior permanent-magnet (VLF-IPM) motor taking advantage of the variable leakage flux property in the rotor core controlled by the q-axis current, without any additional components. The fundamental phenomenon is explained with finite-element analysis results; then, the theoretical equations expressing the variable flux linkage controlled by the q-axis current have been conducted. The proof-of-principle model was designed, and the fundamental properties, such as torque-speed envelope and efficiency map, were evaluated. It was shown that the proposed motor can reduce energy consumption on duty-cycle driving.

Original languageEnglish
Article number7115116
Pages (from-to)3811-3821
Number of pages11
JournalIEEE Transactions on Industry Applications
Issue number5
Publication statusPublished - 2015 Sept 1


  • Energy conversion
  • permanent magnets
  • permanent-magnet generators
  • permanent-magnet motors
  • synchronous machines

ASJC Scopus subject areas

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


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