AC servo motor based position sensorless control system making use of springs

Akira Shimada, Yu Kishiwada, Michiyo Arimura

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


This paper describes a position sensorless control technique on AC servo motor based position control systems. Shimada et al. had previously presented a paper on a DC servo motor based position sensorless control technique using mechanical springs. It was based on a point of view that mechanical springs form the key components for the observability. On the basis of the result obtained from the successful experiment, we assumed that the AC servo motor position sensorless control system would be identical. Using vector control, the controller needs the data of the magnetic pole position on the rotor of the AC servo motor. It is not perfect sensorless control, since it use a rotary encoder. However, we introduce it and demonstrate the expreimental results as an initial step in the new control technology.

Original languageEnglish
Pages (from-to)987-992+7
JournalIEEJ Transactions on Industry Applications
Issue number9
Publication statusPublished - 2007 Sept 25
Externally publishedYes


  • AC servo motor
  • Observer
  • Position sensorless conrol
  • Vector control

ASJC Scopus subject areas

  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering


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