Analytical Stator Design for Reducing the Cogging Torque in Surface-Mounted PM Motors
Subject Areas : electrical and computer engineeringM. R. Alizadeh Pahlavani 1 * , V. Zamani Faradonbe 2
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Keywords: Surface mounted permanent-magnet motors cogging torque dummy slots teeth pairing slots skewing, optimization,
Abstract :
We present an analytical method for the calculation of cogging torque in surface permanent-magnet (PM) motors. The cogging torque is calculated by integrating the Maxwell stress tensor inside the air gap. The stator design techniques are applied to reduce the cogging torque in SPM motors. The used techniques are stator dummy slots, teeth pairing and stator slot skewing. The direct search method is used to find the optimum geometry in the mentioned methods. Finally, the validity of the proposed model and the obtained results are verified with Finite Element Analysis.
[1] L. Zhu, S. Z. Jiang, and Z. Q. Zhu, "Analytical methods for minimizing cogging torque in permanent magnet machines," IEEE Trans. on Magn., vol. 45, no. 4, pp. 2020-2031, Apr. 2009.
[2] T. M. Jahns and W. L. Soong, "Pulsating torque minimization techniques for permanent magnet AC motor drives: A review," IEEE Trans. on Indust. Electronics, vol. 43, no. 2, pp. 321-330, Apr. 1996.
[3] D. C. Hanselman, "Effect of skew, pole count and slot count on brushless motor radial force, cogging torque and back EMF," in Elect. Eng. Proc. Elect. Power Appl., vol. 44, no.5, pp. 325-330, Sep. 1997.
[4] M. S. Islam and T. Sebastian, "Issues in reducing the cogging torque on mass-produced permanent-magnet brushless DC motor," IEEE Trans. on Indust. Electronics, vol. 40, no. 3, pp. 813-820, May/Jun. 2004.
[5] Z. Q. Zhu and D. Howe, "Influence of design parameters on cogging torque in permanent magnet machines," IEEE Trans. on Energy Convers, vol. 15, no. 4, pp. 407-412, Dec. 2000.
[6] M. Dai, A. Keyhani, and T. Sebastian, "Torque ripple analysis of a PM brushless DC motor using finite element method," IEEE Trans. on Energy Convers, vol. 19, no. 1, pp. 40-45, Mar. 2004.
[7] N. Bianchi and S. Bolognani, "Design techniques for reducing the cogging torque in surface mounted PM motors," IEEE Trans. on Ind. Applicat, vol. 38, no. 5, pp. 1259-1265, Sep. 2002.
[8] S. M. Hwang, et al., "Various design techniques to reduce cogging torque by controlling energy variation in permanent magnet motors," IEEE Trans. on Magn, vol. 37, no. 4, pp. 2806-2909, Jul. 2001.
[9] S. M. Hwang and J. B. Eom, "Cogging torque and acoustic noise reduction in permanent magnet motors by teeth pairing," IEEE Trans. on Magn, vol. 36, no. 5, pp. 3144-3146, Sep. 2000.
[10] Y. Lin, Y. Hu, and T. Lin, "A method to reduce the cogging torque of spindle motors," J. of Magnetism and Magnetic Materials, vol. 209, no. 1-3, pp. 180-182, Feb. 2000.
[11] N. Bianchi and S. Bolognani, "Torque harmonic compensation in a synchronous reluctance motor," IEEE Trans. on Energy Convers, vol. 23, no. 2, pp. 466-473, Jun. 2008.
[12] C. Bianchini and F. Immovilli, "Review of design solutions for internal permanent-magnet machines cogging torque reduction," IEEE. Trans. on Magn, vol. 48, no. 10, pp. 2685-2693, Oct. 2012.
[13] N. Levin, et al., "Methods to reduce the cogging torque in permanent magnet synchronous machines," Electronica ir Electrotechnica, vol. 19, no. 1, pp. 23-26, 2013.
[14] S. Taghipour Boroujeni and V. Zamani, "A novel analytical model for no-load, slotted, surface-mounted PM machines: Air gap flux density and cogging torque," IEEE. Trans. on Magn, vol. 51, no. 4, article 8104008, Apr. 2015.
[15] D. K. Cheng, Field and Wave Electro Magnetic, Addison Wesley Publishing Company, 1983.