Design of High-Speed Permanent Magnet Motor Considering Rotor Radial Force and Motor Losses

Nai-Wen Liu, Kuo-Yuan Hung, Shih-Chin Yang, Feng-Chi Lee and Chia-Jung Liu
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Nai-Wen Liu: Department of Mechanical Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan
Kuo-Yuan Hung: Department of Mechanical Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan
Shih-Chin Yang: Department of Mechanical Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan
Feng-Chi Lee: Department of Mechatronics Control, Industrial Technology Research Institute, 195, Sec. 4, Chung Hsing Road, Hsinchu 31057, Taiwan
Chia-Jung Liu: Department of Mechatronics Control, Industrial Technology Research Institute, 195, Sec. 4, Chung Hsing Road, Hsinchu 31057, Taiwan

Energies, 2020, vol. 13, issue 22, 1-16

Abstract: Different from the design of conventional permanent magnet (PM) motors, high-speed motors are primarily limited by rotor unbalanced radial forces, rotor power losses, and rotor mechanical strength. This paper aimed to propose a suitable PM motor with consideration of these design issues. First, the rotor radial force is minimized based on the selection of stator tooth numbers and windings. By designing a stator with even slots, the rotor radial force can be canceled, leading to better rotor strength at high speed. Second, rotor power losses proportional to rotor frequency are increased as motor speed increases. A two-dimensional sensitivity analysis is used to improve these losses. In addition, the rotor sleeve loss can be minimized to less than 8.3% of the total losses using slotless windings. Third, the trapezoidal drive can cause more than a 33% magnet loss due to additional armature flux harmonics. This drive reflected loss is also mitigated with slotless windings. In this paper, six PM motors with different tooth numbers, stator cores, and winding layouts are compared. All the design methods are verified based on nonlinear finite element analysis (FEA).

Keywords: high-speed motor; permanent magnet motor; variable-frequency drive (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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