ANALYSIS OF THE EFFECT OF SLOT-OPENNING WIDTH AND MAGNET LENGTH ON THE COGGING TORQUE IN THE EXTERNAL ROTOR BLDC MOTOR USING IN MILITARY APPLICATION.
219 viewsKeywords:
Cogging torque; BLDC; Carter coefficient; Slot dimensions; Leakage flux model of stator teeth; Military application.Abstract
BLDC-Brushless Direct Current motors are more and more widely used thanks to the advantages of relatively simple structure, high efficiency, and good speed regulation. However, one of its disadvantages is that the cogging torque is high. Reducing the cogging torque is one of the aims of the BLDC motor design. In particular, in military applications, the cogging torque causes unwanted vibrations and noises. In this paper, the author analyzes factors which influence the cogging torque. Simulation results show the effect of teeth/groove and the size of the magnet on the cogging torque value. Thereby, the author gives a plan on the design of the stator groove opening and the magnet coverage to minimize the effect of this parameter on the quality of torque and the working characteristics of the motors.
References
[1]. Duane Hanselman. “Brushless Permanent Magnet Motor Design” 2nd Edition. 2006, Magna Physics Publishing, ISBN: 1-881855-15-5.
[2]. Jacek F. Gieras. “Permanent Magnet Motor Techlonogy 3nd Edition”. 2010, Taylor and Francis Group, ISBN: 978-1-4200-6440-7.
[3]. Đại học Bách khoa Hà Nội, “Giáo trình Thiết kế khí cụ điện hạ áp”. 1986.
[4]. Hung Vu Xuan, “Modeling of exterior rotor permanent magnet machines with concentrated windings”, TU Delft Publisher, 2012. 250 pages. ISBN 9789088914690.
[5]. T. Liu, S. Huang, J. Gao, and K. Lu, ‘‘Cogging torque reduction by slot-opening shift for permanent magnet machines,’’ IEEE Trans. Magn., vol. 49, no. 7, pp. 4028–4031, Jul. 2013.
[6]. C. Xia, Z. Chen, T. Shi, and H. Wang, ‘‘Cogging torque modeling and analyzing for surface-mounted permanent magnet machines with auxiliary slots,’’ IEEE Trans. Magn., vol. 49, no. 9, pp. 5112–5123, Sep. 2013.
[7]. W. Ren, Q. Xu, Q. Li, and L. Zhou, ‘‘Reduction of cogging torque and torque ripple in interior PM machines with asymmetrical V-type rotor design,’’ IEEE Trans. Magn., vol. 52, no. 7, Jul. 2016, Art. no. 8104105
[8]. X. Ge, Z. Q. Zhu, G. Kemp, D. Moule, and C. Williams, ‘‘Optimal step-skew methods for cogging torque reduction accounting for threedimensional effect of interior permanent magnet machines,’’ IEEE Trans. Energy Convers., vol. 32, no. 1, pp. 222–232, Mar. 2017
