Abstract
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.
Highlights
Direct drive permanent magnet motors (DDPMMs) are becoming a popular key technology that can be applied in home appliances, industrial tools, and electric vehicles, given their high efficiency, high power density, and low maintenance costs
In reference [7,8], an air-gap magnetic field that considered the slotting effect was calculated by the product of the slotless air-gap magnetic field and the air-gap relative permeability function, where the relative permeability function was obtained by the conformal transformation method
It can be seen from Equations (20) and (21) that the slot opening width affects the coefficient of the magnetic field distribution in the air-gap subdomain
Summary
Direct drive permanent magnet motors (DDPMMs) are becoming a popular key technology that can be applied in home appliances, industrial tools, and electric vehicles, given their high efficiency, high power density, and low maintenance costs. The effect of slot opening width on the air-gap magnetic field of the direct drive permanent magnet motor (DDPMSM) should be investigated. The air-gap relative permeability method was adopted in reference [9], in which the slot effect was considered. This does not study the distribution of the air-gap magnetic field when the motor operates on load. Sci. 2019, 9, x FOR PEER REVIEW permeability method was adopted in reference [9], in which the slot effect was considered
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