Simulation of the Reduction of Force Ripples of the Permanent Magnet Linear Synchronous Motor

  • Chung, Koon-Seok (Dept. of Electrical and Electronic Engineering, Dong-A University) ;
  • Zhu, Yu-Wu (Dept. of Electrical and Electronic Engineering, Dong-A University) ;
  • Lee, In-Jae (Dept. of Electrical and Electronic Engineering, Dong-A University) ;
  • Lee, Kwon-Soon (Dept. of Electrical and Electronic Engineering, Dong-A University) ;
  • Cho, Yun-Hyun (Dept. of Electrical and Electronic Engineering, Dong-A University)
  • Published : 2007.06.01


The significant drawback of the permanent magnet linear synchronous motor (PMLSM) is force ripples, which are generated by the distortion of the stator flux linkage distributions, cogging forces caused by the interaction of the permanent magnet and the iron core and the end effects. This will deteriorate the performance of the drive system in high precision applications. The PMLSM and its parasitic effects are analyzed and modeled using the complex state-variable approach. To minimize the force ripple and realize the high precision control, the components of force ripples are extracted first and then compensated by injecting the instantaneous current to counteract the force ripples. And this method of the PMLSM system is realized by the field oriented control method. In order to verify the validity of this proposed method, the system simulations are carried out and the results are analyzed. The effectiveness of the proposed force ripples reduction method can be seen according to the comparison between the compensation and non-compensation cases.


  1. FAA-JENG LIN, KUO-KAI SHYU, and CHIHHONG LIN, 'Incremental Motion Control of Linear Synchronous Motor' IEEE. Trans. on Aerospace and Electronic System, vol. 38. No. 3, July 2002
  2. Joachim Holtz, 'Identification and Compensation of Torque Ripple in High-Precision Permanent Magnet Motor Drives' IEEE. Trans. on Industrial Electronics, vol. 43. No. 2, April 1996
  3. B.-J. Brunsbach, G. Henneberger, and Th. Klepsch, 'Compesation of Torque Ripple' University of Technology Aachen, Germany, pp. 588-593
  4. Oskar Wallmark, 'Modelling of Permanent-Magnet Synchronous Motors Machines with Non-Sinusoidal Flux Linkage' Chalmers University of Technology, Sweden
  5. 'Field Oriented Control of 3-Phase AC-Motor' Texas Instruments Europe, February 1998
  6. K.K. Tan, S.N. Huang, and T.H. Lee 'Robust Adaptive Numerical Compensation for Friction and Force Ripple in Permanent-Magnet Linear Motor' IEEE. Trans. on Magnetics, vol. 38. No. 1, January 2002
  7. Nicola Bianchi, Silverio Bolognani, and Alessandro Dalla Francesca Cappello, 'Back E.M.F Improvement and Force Ripple Reduction in PM Linear Motor Drives' 35th Annual IEEE Power Electronics Specialiists Conference. Achen, Germany, 2004
  8. P.J. Hor, Z.Q. Zhu, D. Howe, J. Rees-Jones, 'Minimization of Cogging Force in a Linear Permanent Magnet Motor' IEEE Trans. on Magnetics, vol. 34, No. 5, September 1998
  9. K.K. Tan, S. Zhao, 'Adaptive Force Ripple Suppression in Iron-core Permanent Magnet Linear Motors' Proceeding of the 2002 IEEE International Symposium on Intelligent Control, Vancouver, Canada, October, 2002
  10. N. Bodika, R.J. Cruise, and C.F. Landy, 'esign of a PI Controller to Counteract the Effect of Cogging Forces in a Permanent Magnet Synchronous Linear Motor' IEEE, University of the Wiwatersrand, Johannesburg, South Africa, 1999
  11. J. Holtz, 'pulsewidth modulation-A Survey' IEEE Trans. Ind. Electron, vol. 39, No. 5, pp. 410-420, October 1992

Cited by

  1. Dual Speed Control Scheme of Servo Drive System for a Nonlinear Friction Compensation vol.23, pp.2, 2008,
  2. Characteristic Analysis of Interior Permanent-Magnet Synchronous Motor in Electrohydraulic Power Steering Systems vol.55, pp.6, 2008,