Design theory of a variable characteristic motor using compound magnetomotive forces

Takashi Kato, Kan Akatsu, Tomoaki Shigeta, Masaki Nakano, Masahiro Tsukamoto, Minoru Arimitsu

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


The permanent magnet synchronous motor offers the possibility of obtaining higher efficiency in a smaller motor size. However, it is difficult to vary the range of high motor efficiency because of its constant magnetomotive force (MMF) level. This paper proposes a variable characteristic motor that embodies a new concept of the compound magnetomotive forces (CMMF) motor. The motor uses a special magnet arrangement that has the MMF of components with different number of pole pairs. The application of compound current control to this motor makes it possible to vary the motor speed and torque (N-T) characteristics. This paper describes the derivation of the theoretical equations for this CMMF motor. It also presents the results of FEA and experiments conducted with the prototype motor to demonstrate the validity of the CMMF concept.

Original languageEnglish
Pages (from-to)1049-1058
Number of pages10
JournalIEEJ Transactions on Industry Applications
Issue number8
Publication statusPublished - 2011
Externally publishedYes


  • Compound Magnetomotive Force (CMMF)
  • Electric Vehicle (EV)
  • Harmonics
  • Multiphase
  • Permanent magnet synchronous machine
  • Variable characteristic

ASJC Scopus subject areas

  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering


Dive into the research topics of 'Design theory of a variable characteristic motor using compound magnetomotive forces'. Together they form a unique fingerprint.

Cite this