MATRIX motor with individual control capability for iron loss suppression under flux weakening control

Hiroki Hijikata, Kan Akatsu, Yoshihiro Miyama, Hideaki Arita, Akihiro Daikoku

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Interior type permanent magnet synchronous motors (IPMSMs) have been widely used for various applications because of their high efficiency and high power density. It is well known that the flux weakening control of an IPMSM can extend the operating range by reducing the back-EMF and producing reluctance torque. An IPMSM, however, experiences a large harmonic iron loss in the stator teeth caused by the distorted flux density. In particular, the harmonic eddy current loss significantly increases in the high speed region under flux weakening control. This paper describes a novel motor-drive system that includes an individual multi-phase drive in order to control the current and voltage in each armature winding. The proposed system can be expected to achieve high efficiency driving, a wide operating range, fail-safety and so on. Furthermore, the proposed method gives the distorted flux density distribution a sinusoidal waveform, because the individual control can observe and regulate the instantaneous flux linkage in each stator tooth, although the motor consists of a full-pitch distributed winding. Therefore, the proposed drive can suppress the harmonic iron loss under the flux weakening operation. Simulation and experimental results show that the proposed method can achieve an extensive reduction in the total iron loss in particular in the high speed region.

Original languageEnglish
Pages (from-to)176-183
Number of pages8
JournalIEEJ Journal of Industry Applications
Issue number2
Publication statusPublished - 2016


  • Harmonic iron loss
  • Individual control
  • Interior permanent magnet synchronous motor
  • MATRIX motor
  • Multi-phase drive

ASJC Scopus subject areas

  • Automotive Engineering
  • Energy Engineering and Power Technology
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering


Dive into the research topics of 'MATRIX motor with individual control capability for iron loss suppression under flux weakening control'. Together they form a unique fingerprint.

Cite this