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Asymmetrical Magnets in Rotor Structure of a Permanent Magnet Brushless DC Motor for Cogging Torque Minimization

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Abstract

Drive motors are the mainstay in our day-to-day life. In drive motors, the Permanent Magnet Brushless DC (PMBLDC) motors are more prominent. It has excellent torque-speed characteristics. Compared to others, it has less maintenance cost. The Cogging torque is one of the crucial obstructions in PMBLDC Motor. It has always been a severe impact on the high performance of the machine. The cogging torque leads to the generation of immense vibration and noise. This paper introduces the magnet shaping method for the decrement of cogging torque in a PMBLDC motor. This asymmetrical rotor structure reduces the magnet locking between the rotor and stator. To obtain the asymmetrical rotor structure here, introduced rotor magnets with thicknesses 2.5 mm and 2 mm. Each of the two has the same pole arc 630. These magnets had placed alternatively. This paper also derived an analytical expression of cogging torque with asymmetrical rotor magnets using the Virtual Work Method (VWM). The PMBLDC motor with the asymmetrical rotor had analyzed by 3D Finite Element Analysis (FEA). The simulation result by FEA had compared with the analytical results. It figured out that the cogging torque reduction in the two compared findings is almost alike. The proposed asymmetrical rotor structure is advantageous in minimizing the cogging torque.

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Authors and Affiliations

  1. Department of Electrical and Electronics Engineering, SRM Institute of Science and Technology, SRM Nagar, Kattankulathur, 603203, India

    T. A. Anuja & M. Arun Noyal Doss

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  1. T. A. Anuja
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  2. M. Arun Noyal Doss
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Correspondence to M. Arun Noyal Doss.

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Anuja, T.A., Doss, M.A.N. Asymmetrical Magnets in Rotor Structure of a Permanent Magnet Brushless DC Motor for Cogging Torque Minimization. J. Electr. Eng. Technol. 17, 1271–1279 (2022). https://doi.org/10.1007/s42835-021-00991-3

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  • DOI: https://doi.org/10.1007/s42835-021-00991-3

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