Effect of Slot Opening Width on the Air-Gap Magnetic Field of a Direct Drive Permanent Magnet Motor

Applied Sciences

Jikai Si¹  Yihua Hu²  Yaofei Han³  Shaofeng Chen³  Mengzhen Gao⁴  Caixia Gao⁴ 

[1] College of Electric Engineering, Zhengzhou University, Zhengzhou 450001, China;Department of Electrical Engineering and Electronics, University of Liverpool, Liverpool L693BX, UK;Henan Engineering Research Center for the Control of Power Transmission and Conversion, Pingdingshan 467036, China;School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo 454000, China;

关键词: air-gap magnetic field;    direct drive permanent magnet motor;    exact analytical model;    fourier analysis;    slot opening width;   

DOI  :  10.3390/app9214649

来源: DOAJ

【 摘 要 】

The direct drive permanent magnet motor (DDPMM) is a promising candidate for applications because of its high efficiency, high power density, and low maintenance costs. This study focused on the effect of slot opening width on the air-gap magnetic field of a DDPMM. An exact analytical model based on Fourier analysis was established to calculate the air-gap magnetic field. The analytical general solution of the air-gap magnetic field shows that the slot opening greatly affects the air-gap magnetic field distribution when the amount of the permanent magnet is constant. Then, the air-gap magnetic fields of the DDPMM with closed and open slots were compared at different positions. Furthermore, several finite-element models of motors composed of different numbers of unit motor were established based on the different slot opening widths to study the effect of slot opening width on the air-gap magnetic field. The results obtained using the finite element method verify that the slot opening width greatly affects the air-gap magnetic field.

【 授权许可】

Unknown