Analysis of Cogging Torque Reduction Techniques in Axial-Field Flux-Switching Permanent-Magnet Machine

An axial-field flux-switching permanent-magnet machine (AFFSPMM) is suitable to be used in wind power generation and electric vehicles. However, the cogging torque (Tcog) is large. To obtain high-performance AFFSPMM, the reduction of Tcog in AFFSPMM is investigated. The theoretical Tcog expression is deduced. Based on a 3-D finite-element method, the influences of the design parameters on the Tcog and the reduction methods of Tcog, such as rotor tooth skewing (RTS), rotor tooth circumferential pairing (RTCP), and rotor tooth notching (RTN), are analyzed. The design parameters, except the axial length of rotor, have influences on Tcog, and optimizing the design parameters can decrease Tcog. Tcog can be greatly reduced by RTS for AFFSPMM with a parallel stator tooth and fan-shape permanent-magnet structure. However, RTS is not effective in reducing Tcog for AFFSPMM with a fan-shape stator tooth and parallel PM (FSST-PPM) structure. Tcog greatly decreases by RTN and RTCP for an FSST-PPM stator structure. Moreover, the reduction effect of Tcog with RTN is better than that with RTCP.

[1]  Jian-Xin Shen,et al.  Torque Analysis of Permanent-Magnet Flux Switching Machines With Rotor Step Skewing , 2012, IEEE Transactions on Magnetics.

[2]  Sang-Yong Jung,et al.  Reduction on Cogging Torque in Flux-Switching Permanent Magnet Machine by Teeth Notching Schemes , 2012, IEEE Transactions on Magnetics.

[3]  Nicola Bianchi,et al.  Design techniques for reducing the cogging torque in surface-mounted PM motors , 2000, Conference Record of the 2000 IEEE Industry Applications Conference. Thirty-Fifth IAS Annual Meeting and World Conference on Industrial Applications of Electrical Energy (Cat. No.00CH37129).

[4]  Wei Hua,et al.  Cogging torque reduction of flux-switching permanent magnet machines without skewing , 2008, 2008 International Conference on Electrical Machines and Systems.

[5]  N. Takorabet,et al.  Effect of magnet segmentation on the cogging torque in surface-mounted permanent-magnet motors , 2006, IEEE Transactions on Magnetics.

[6]  Lu Yongping,et al.  Theoretical and Simulation Analysis of Influences of Stator Tooth Width on Cogging Torque of BLDC Motors , 2009, IEEE Transactions on Magnetics.

[7]  Z. Zhu,et al.  A Novel Axial Field Flux-Switching Permanent Magnet Wind Power Generator , 2011, IEEE Transactions on Magnetics.

[8]  Jian-Xin Shen,et al.  Cogging torque reduction in permanent magnet flux-switching machines by rotor teeth axial pairing , 2010 .

[9]  Jian-Xin Shen,et al.  Cogging torque suppression in a permanentmagnet flux-switching integrated-starter-generator , 2010 .

[10]  D. Howe,et al.  Influence of design parameters on cogging torque in permanent magnet machines , 1997, 1997 IEEE International Electric Machines and Drives Conference Record.

[11]  Z.Q. Zhu,et al.  Analytical Methods for Minimizing Cogging Torque in Permanent-Magnet Machines , 2009, IEEE Transactions on Magnetics.

[12]  Minqiang Hu,et al.  Study on a Long Primary Flux-Switching Permanent Magnet Linear Motor for Electromagnetic Launch Systems , 2012, IEEE Transactions on Plasma Science.

[13]  Yubo Yang,et al.  Study of cogging torque in surface-mounted permanent magnet motors with energy method , 2003 .

[14]  Z. Zhu,et al.  Influence of design parameters on cogging torque in permanent magnet machines , 1997 .