Abstract：Based on the periodicity of cogging torque, the effect of permanent magnet segmentation on the cogging torque of surface-mounted permanent magnet motor is studied by superposition method in this paper. In this method, the permanent magnet pole is separated into several elementary magnet blocks. The total cogging torque is the sum of all the cogging torque of elementary magnet blocks. The distribution of the cogging torque of magnet blocks has great effect on the total cogging torque. The cogging torque can be greatly reduced by suitable selection the number of magnet blocks and width of magnet blocks. The method too btain the number of magnet blocks and width of magnet blocks is studied with analytical method. At last, the conclusions are verified by finite element method.
杨玉波, 王秀和, 朱常青. 基于分块永磁磁极的永磁电机齿槽转矩削弱方法[J]. 电工技术学报, 2012, 27(3): 73-78.
Yang Yubo, Wang Xiuhe, Zhu Changqing. Effect of Permanent Magnet Segmentation on the Cogging Torque of Surface Mounted Permanent Magnet Motors. Transactions of China Electrotechnical Society, 2012, 27(3): 73-78.
[1] 王秀和, 杨玉波. 基于极弧系数选择的实心转子永磁同步电动机齿槽转矩削弱方法研究[J]. 中国电机工程学报, 2005, 25(15): 146-149. Wang Xiuhe, Yang Yubo. The method for reducing cogging torque by suitable selection of pole-arc coefficient in solid-rotor PM motors[J]. Proceedings of the CSEE, 2005, 25(15): 146-149. [2] 王道涵, 王秀和, 杨玉波, 等. 基于磁极不对称角度优化的内置式永磁无刷直流电动机齿槽转矩削弱方法[J]. 中国电机工程学报, 2008, 28(9): 66-70. Wang Daohan, Wang Xiuhe, Yang Yubo, et al. Optimization for the asymmetric angles of magnetic pole to reduce cogging torque in inner-buried PM brushless DC motors[J]. Proceedings of the CSEE, 2008, 28(9): 66-70. [3] Ko H S, Kim K J. Characterization of noise and vibration sources in interior permanent-magnet brushless DC motors[J]. IEEE Trans on Magnetics, 2004, 40(6): 3482-3489. [4] Jeonghu Kwack, Seungjae Min, Jung Pyo Hong.Optimal stator design of interior permanent magnet motor to reduce torque ripple using the level set method[J].IEEE Trans. on Magnetics, 2010, 46(6): 2108-2111. [5] Kim S I, Lee J Y, Kim Y K, et al. Optimization for reduction of torque ripple in interior permanent magnet motor by using the Taguchi method[J]. IEEE Trans. on Magnetics, 2005, 41(4): 1796-1799. [6] Kioumarsi A, Moallem M, Fahimi B. Mitigation of torque ripple in interior permanent magnet motors by optimal shape design[J]. IEEE Trans. on Magnetics, 2006, 42(10): 3706-3711. [7] Qian Weizhe, Panda Sanjib K, Xu Jianxin. Torque ripple minimization in PM synchronous motors using iterative learning control[J].IEEE Trans. on Power Electronics, 2004, 19(2): 272-279. [8] Gieras J F. Analytical approach to cogging torque calculation of PM brushless motors[J]. IEEE Trans. on Industry Applications, 2004, 40(5): 1310-1316. [9] Wang Xiuhe, Yang Yubo, Fu Dajin. Study of cogging torque in surface-mounted permanent magnet motors with energy method[J]. Journal of Magnetism and Magnetic Material, 2003, 267(11): 80-85. [10] Zhu Z Q, Howe D. Analytical prediction of the cogging torque in radial field permanent magnet brushless motors[J]. IEEE Trans. on Magnetics, 1992, 28(2): 1371-1374. [11] Lin D, Ho S L, Fu W N. Analytical prediction of cogging torque in surface-mounted permanent-magnet motors[J]. IEEE Trans. on Magnetics, 2009, 45(9): 3296-3302. [12] Damir Zarko, Drago Ban, Thomas A Lipo, Analytical solution for cogging torque in surface permanent- magnet motors using conformal mapping[J]. IEEE Trans. on Magnetics, 2008, 44(1): 52-65. [13] Bianchi N, Bolognani S. Design techniques for reducing the cogging torque in surface-mounted PM motors[J]. IEEE Trans. on Industry Applications, 2002, 38(5): 1259-1265. [14] Breton C, Bartolome J. Influence of machine symmetry on reduction of cogging torque in permanent-magnet brushless motors[J]. IEEE Trans. on Magnetics, 2000, 36(5): 3819-3823. [15] 杨玉波, 王秀和, 丁婷婷. 极弧系数组合优化的永磁电机齿槽转矩削弱方法[J]. 中国电机工程学报, 2007, 27(6): 7-11. Yang Yubo, Wang Xiuhe, Ding Tingting, Analysis of the optimization of the pole arc combination to reduce the cogging torque in PM motors[J]. Proceedings of the CSEE, 2007, 27(6): 7-11. [16] 杨玉波, 王秀和. 基于不等槽口宽配合的永磁电动机齿槽转矩削弱方法[J]. 电工技术学报, 2005, 20(3): 40-44. Yang Yubo, Wang Xiuhe.A method for reducing cogging torque by different slot widths in permanent magnet motors[J]. Transactions of China Electro-technical Society, 2005, 20(3): 40-44. [17] Luke Dosiek, Pragasen Pillay. Cogging torque reduction in permanent magnet machines[J]. IEEE Trans. on Industry Application, 2007, 43(6): 1565- 1571. [18] Mohammad S Islam, Sayeed Mir, Tomy Sebastian. Issues in reducing the cogging torque of mass- produced permanent-magnet brushless DC motor[J]. IEEE Trans. on Industry Applications, 2004, 40(3): 813-820. [19] Ramdane Lateb, Noureddine Takorabet, Farid Meibody Tabar. Effect of magnet segmentation on the cogging torque in surface-mounted permanent-magnet motors[J]. IEEE Trans. on Magnetics, 2006, 42(3): 442-445. [20] Hanselman D C．Effect of skew, pole count and slot count on brushless motor radial force, cogging torque and back EMF[J]. IEE Proc. on Electr. Power App1., 1997, 144(5): 325-330. [21] Takeo Ishikawa, Gordon R Slemon. A method of reducing ripple torque in permanent magnet motors without skewing[J]. IEEE Trans. on Magnetics, 1993, 29(2): 2028-2031. [22] Zhu Z Q, Ruangsinchaiwanich S, Howe David. Synthesis of cogging torque waveform from analysis of a single stator slot[J]. IEEE Trans. on Industry Applications, 2006, 42(3): 650-657. [23] Zhu Z Q, Ruangsinchaiwanich S, Chen Y, et al. Evaluation of superposition technique for calculating cogging torque in permanent-magnet brushless machines[J]. IEEE Trans. on Magnetics, 42(5): 1597-1603. [24] Liu Z J, Li J T, Jabbar M A. Cogging torque prediction by superposition of torque due to pole transition over slot[C].IEEE International Conference on Electric Machines and Drives, 2005: 1219-1224.
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