Rotor Design to Improve Starting Performance of the Line-start Synchronous Reluctance Motor

  • Jung Tae-Uk (Gwangju Research Center, Korea Institute of Industrial Technology (KITECH)) ;
  • Nam Hyuk (Research Lab., Digital Appliance Company, LG Electronics Inc.)
  • Published : 2006.09.01


A single-phase line-start synchronous reluctance motor (LSSynRM) has merits of low cost, high efficiency and reliability. LSSynRM has an unbalanced magnetic circuit caused by flux barriers and various shapes of conductor bars when starting. Thus the motor may generate unstable starting torque in accordance with the initial starting position of the rotor. This paper presents the rotor design to improve starting performance of the LSSynRM. Design variables are the number and the shape of the conductor bars. This design result is compared with the initial prototype and single-phase induction motor.


  1. H. Murakami, Y. Honda, H. Kiriyama, S. Morimoto, and Y. Takeda, 'The performance comparison of SPMSM, IPMSM and SynRM in use as airconditioning compressor,' in Conf. Rec. the 34th IAS Annual Meeting, vol. 2, pp. 840-845, Oct. 1999
  2. H. Nam, K. H. Ha, J. J. Lee, J. P. Hong, and G. H. Kang, 'A study on iron loss analysis method considering the harmonics of the flux density waveforms using iron loss curves tested on Epstein samples,' IEEE Trans. Magn., vol. 39, no. 3, pp. 1472-1475, May 2003
  3. I. Boldea, Z. X. Fu, and S. A. Nasar, 'Performance evaluation of axially-laminated anisotropic (ALA) rotor reluctance synchronous motors,' IEEE Trans on Industrial Application, vol. 30, no. 4, pp. 977-985, July/August 2003
  4. H. Kiriyama, S. Kawano, Y. Honda, T. Higaki, S. Moromoto, and Y. Takeda, 'High performance synchronous reluctance motor with multi-flux barrier for the appliance industry,' in Conf. Rec. the 33th IAS Annual Meeting, vol. 1, pp. 111-117, Oct. 1998