Wide Speed Range Operation by Low-Voltage Inverter-Fed MATRIX Motor for Automobile Traction Motor

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

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


This research proposes a novel low-voltage inverter-fed motor drive with variable parameters achieved through the independent armature winding for the automobile traction motor. The independent armature winding with low-voltage inverters can improve the total efficiency by reducing the converter losses. The inverters are able to change their connections to different coils groups of the armature winding in order to achieve the wide operating range. The voltage equation of each mode can be shown by using transformation matrix when the winding connection is changed. Thus the proposed motor called MATRIX motor. In this paper, the down sized model was designed to verify the principle. The principle model is able to achieve four motor parameters. It was confirmed that the principle model could extend the operating range and could achieve the high efficiency driving in wide speed range. Furthermore, the novel winding reconfiguration method is proposed that not only avoids the surge voltage, but also compensates the torque reduction during the winding reconfigurations.

Original languageEnglish
JournalIEEE Transactions on Power Electronics
Publication statusAccepted/In press - 2017 Sept 11


  • Inverters
  • Low voltage inverter
  • Mathematical model
  • MATRIX motor
  • Permanent magnet motors
  • Synchronous motors
  • Torque
  • Traction motor
  • Traction motors
  • Variable parameters
  • Winding reconfiguration method
  • Windings

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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