Optimization of Magnetic Pole Shifting to Reduce Cogging Torque in Solid-Rotor Permanent-Magnet Synchronous Motors

In this paper, the method of magnetic poles shifting was combined with optimization method to reduce cogging torque in solid-rotor permanent-magnet synchronous motors. Although the finite-element method (FEM) can calculate the cogging torque accurately, to find the peak value of cogging torque, the cogging torque for different relative positions between permanent magnets and slots must be calculated; thus, the optimization will take a long time. To reduce optimization time, a novel analytical method was proposed to determine the initial value and feasible range of the shifting angles. Then the optimization method and FEM were used to minimize the cogging torque. Two prototype motors were analyzed and optimized, respectively. It was proved that the cogging torque can be greatly reduced by the proposed method.

[1]  Chang Seop Koh,et al.  New cogging-torque reduction method for brushless permanent-magnet motors , 2003 .

[2]  R. Wrobel,et al.  Optimization of permanent magnet shape for minimum cogging torque using a genetic algorithm , 2004, IEEE Transactions on Magnetics.

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

[4]  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.

[5]  Jasbir S. Arora,et al.  TWO ALGORITHMS FOR GLOBAL OPTIMIZATION OF GENERAL NLP PROBLEMS , 1996 .

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

[7]  Caroline A. Ross,et al.  Major hysteresis loop modeling of two-dimensional arrays of single domain particles , 2000 .

[8]  D. Howe,et al.  Influence of Stator Asymmetry on Cogging Torque of Permanent Magnet Brushless Machines , 2008, IEEE Transactions on Magnetics.

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

[10]  Ju Lee,et al.  A Study on the Characteristics Due to Pole-Arc to Pole-Pitch Ratio and Saliency to Improve Torque Performance of IPMSM , 2007, IEEE Transactions on Magnetics.

[11]  Nicola Bianchi,et al.  Reducing Torque Ripple in PM Synchronous Motors by Pole Shifting , 2000 .

[12]  J.A. Tapia,et al.  Design Consideration to Reduce Cogging Torque in Axial Flux Permanent-Magnet Machines , 2007, IEEE Transactions on Magnetics.

[13]  Chang-Chou Hwang,et al.  Reduction of cogging torque in spindle motors for CD-ROM drive , 1998 .

[14]  Deug-Woo Lee,et al.  Various design techniques to reduce cogging torque by controlling energy variation in permanent magnet motors , 2001 .

[15]  W. Jeong,et al.  Cogging torque and acoustic noise reduction in permanent magnet motors by teeth pairing , 2000 .

[16]  Sang-Yong Jung,et al.  Reducing Cogging Torque in Surface-Mounted Permanent-Magnet Motors by Nonuniformly Distributed Teeth Method , 2011, IEEE Transactions on Magnetics.

[17]  Xiuhe Wang,et al.  The optimization of pole arc coefficient to reduce cogging torque in surface-mounted permanent magnet motors , 2006, IEEE Transactions on Magnetics.

[18]  T. Lipo,et al.  Analytical Solution for Cogging Torque in Surface Permanent-Magnet Motors Using Conformal Mapping , 2008, IEEE Transactions on Magnetics.

[19]  K. Hameyer,et al.  Combined numerical and analytical method for geometry optimization of a PM motor , 2006, IEEE Transactions on Magnetics.

[20]  B. J. Chalmers,et al.  Influence of machine symmetry on reduction of cogging torque in permanent-magnet brushless motors , 2000 .

[21]  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).