Analytical calculation of armature-reaction field in surface-mounted permanent-magnet machines accounting for slots in stator and rotor

2017 ◽  
Vol 53 (4) ◽  
pp. 591-604 ◽  
Author(s):  
Yu Zhou ◽  
Huaishu Li ◽  
Zhiqiang Xue ◽  
Fei Xia ◽  
Xin Man
Keyword(s):  
Permanent Magnet ◽  
Analytical Calculation ◽  
Permanent Magnet Machines ◽  
Reaction Field ◽  
Armature Reaction

scholarly journals Analytical Calculation of Armature Reaction Field of the Interior Permanent Magnet Motor

Energies ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 2375 ◽  
Author(s):  
Fangwu Ma ◽  
Hongbin Yin ◽  
Lulu Wei ◽  
Liang Wu ◽  
Cansong Gu
Keyword(s):  
Magnetic Field ◽  
Permanent Magnet ◽  
Calculation Method ◽  
Acoustic Noise ◽  
Analytical Calculation ◽  
Critical Issue ◽  
Permanent Magnet Motors ◽  
Reaction Field ◽  
Armature Reaction ◽  
Interior Permanent Magnet

The energy crisis and environmental concerns worldwide have helped usher in the age of electric vehicles (EVs) and hybrid EVs (HEVs). The interior permanent magnet motors (IPMMs) are widely used in these vehicles. The analysis of the armature reaction field is the most critical issue in the study of IPMMs since it determines the characters of torque, efficiency, vibration, and the radiated acoustic noise. This paper provides a calculation method of the armature reaction magnetic field (ARMF) of an IPMM. First, the formulas of ARMF without magnetic barrier are derived. Second, the relative permeance function of an IPMM is calculated. Third, the analytical solution of the ARMF of an IPMM is derived by applying the armature reaction magnetic field with unsaturated rotor multiplied by relative permeance function. Finally, several results of comparisons between the calculation method proposed in this paper and the finite element method are presented. Based on the calculation method proposed in this paper, the magnetic barrier’s influence on the ARMF is studied. The spatial harmonic orders and time harmonic orders of the ARMF of IPMM are revealed respectively.

A novel analytical calculation of magnetic field in the slotted air gap of spoke-type permanent-magnet machines using conformal mapping

2020 ◽  
pp. 1-15
Author(s):  
Jianqi Li ◽  
Yu Zhou ◽  
Jianying Li
Keyword(s):  
Magnetic Field ◽  
Conformal Mapping ◽  
Permanent Magnet ◽  
Flux Density ◽  
Analytical Method ◽  
Electromotive Force ◽  
Analytical Calculation ◽  
Air Gap ◽  
Permanent Magnet Machines ◽  
Peak Value

This paper presented a novel analytical method for calculating magnetic field in the slotted air gap of spoke-type permanent-magnet machines using conformal mapping. Firstly, flux density without slots and complex relative air-gap permeance of slotted air gap are derived from conformal transformation separately. Secondly, they are combined in order to obtain normalized flux density taking account into the slots effect. The finite element (FE) results confirmed the validity of the analytical method for predicting magnetic field and back electromotive force (BEMF) in the slotted air gap of spoke-type permanent-magnet machines. In comparison with FE result, the analytical solution yields higher peak value of cogging torque.

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