Starting procedure of rotation sensorless PMSM at coasting condition for railway vehicle traction

Toshifumi Yamakawa, Shinji Wakao, Keiichiro Kondo, Takashi Yoneyama, Shun Taniguchi, Shinsuke Mochizuki

Research output: Contribution to journalArticle

9 Citations (Scopus)


This paper investigates the procedure for starting a rotation sensorless PMSM under coasting condition for railway vehicle traction. To achieve restarting, the initial rotor position and speed at restart are needed. The existing algorithm for estimation of the initial position and speed cannot be applied to railway vehicle traction because of the greater speed range and the longer current sampling time. We propose a novel method for estimation of the initial speed. The estimation method is verified experimentally to assure that it is suitable for application to the railway vehicle traction system.

Original languageEnglish
Pages (from-to)56-63
Number of pages8
JournalElectrical Engineering in Japan (English translation of Denki Gakkai Ronbunshi)
Issue number2
Publication statusPublished - 2009 Nov 15



  • Permanent magnet synchronous motor
  • Railway vehicle traction
  • Rotation sensorless control

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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