Abstract
In this study, an analytical model is established to efficiently compute the magnetic field and unbalanced magnetic pull (UMP) in axial-flux permanent-magnet motors (AFPMMs). The effects of stator slotting, end effect, and rotor eccentricity on the magnetic field and forces were investigated. Static and dynamic eccentricities are analyzed and considered in the model. An effective function of the air gap permeance was introduced for effect of the stator slots to compute the flux density. A specific coefficient function is defined to calculate the end effect. A Fourier transform is used to compute the variations of the permanent-magnet remanence and the air gap permeance due to the slotted stator opposite to a slotless stator. The unbalanced magnetic forces were evaluated as a function of the air gap magnetic field using analytical equations. The proposed analytical method dramatically reduces the model size and computational time. It can be applied to the analysis of AFPMMs and is much faster than the three-dimensional finite element method (FEM). By comparing with the obtained using the FEM, the model results are validated.
Highlights
On account of the high torque density, high efficiency, and compact structure, axial-flux permanent-magnet motors (AFPMMs) have been applied in various fields and play a very important role, for instance, flywheel energy storage, wind power generation, light electrical traction, or electric vehicles, where the axial length of machine is limited and direct coupling is preferred.e AFPMMs’ modeling can be performed via analytical methods [1,2,3,4,5,6,7] and finite element method (FEM) analyses [8–10]
Based on the above literature review, precise and efficient calculation results of the distribution of magnetic flux density are necessary for magnetic force modeling, especially in the air gap region of AFPMMs. erefore, it is necessary to develop a valid analytical method that can quickly compute the unbalanced forces of AFPMMs under rotor eccentricity conditions with high accuracy
We innovatively develop the magnetic field of the disc motor, analyse the force on the eccentricity state, which provides a reference for the stress and fatigue life analysis of bearing, mandrels, and other stress elements, and develop an analytical method that can more quickly compute the performance of AFPMMs under the impact of eccentricity with the required accuracy
Summary
On account of the high torque density, high efficiency, and compact structure, AFPMMs have been applied in various fields and play a very important role, for instance, flywheel energy storage, wind power generation, light electrical traction, or electric vehicles, where the axial length of machine is limited and direct coupling is preferred. Based on the above literature review, precise and efficient calculation results of the distribution of magnetic flux density are necessary for magnetic force modeling, especially in the air gap region of AFPMMs. erefore, it is necessary to develop a valid analytical method that can quickly compute the unbalanced forces of AFPMMs under rotor eccentricity conditions with high accuracy. We innovatively develop the magnetic field of the disc motor, analyse the force on the eccentricity state, which provides a reference for the stress and fatigue life analysis of bearing, mandrels, and other stress elements, and develop an analytical method that can more quickly compute the performance of AFPMMs under the impact of eccentricity with the required accuracy. The analytical modeling is used to compute the unbalanced magnetic forces due to rotor eccentricities, considering both the end effect and slotted stators
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