Decoupling control of linear and rotary permanent magnet actuator using two-directional d-q transformation

Ping Jin, Heyun Lin, Shuhua Fang, Siu Lau Ho

Research output: Journal article publicationJournal articleAcademic researchpeer-review

20 Citations (Scopus)


This paper presents a study on decoupling control of a linear and rotary permanent magnet actuator (LRPMA) with linear, rotary and helical movements. Since both linear and rotary motions of the actuator are dependent on both current and voltage, a novel two-directional d-q transformation is proposed to decouple the inter-relationship between the current and voltage in each coil. The expressions of input power, magnetic field energy, rotary torque, linear force and copper loss are all derived. A MATLAB/Simulink model for helical movement is then setup with hysteresis current control. A practical LRPMA prototype is manufactured and its control system is implemented with a dual digital signal processor. Simulations and experimental measures on the LRPMA prototype are reported to showcase the effectiveness of the control strategy.
Original languageEnglish
Article number6214608
Pages (from-to)2585-2591
Number of pages7
JournalIEEE Transactions on Magnetics
Issue number10
Publication statusPublished - 5 Oct 2012


  • Decoupling control
  • linear and rotary permanent magnet actuator
  • two-directional d-q transformation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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