An improved analytical solution for predicting magnetic forces in permanent magnet motors

2008 ◽  
Vol 103 (7) ◽  
pp. 07F135 ◽  
Author(s):  
Z. J. Liu ◽  
J. T. Li ◽  
Q. Jiang
Keyword(s):  
Analytical Solution ◽  
Permanent Magnet ◽  
Permanent Magnet Motors ◽  
Magnetic Forces

scholarly journals Influence of a Winding Short-Circuit Fault on Demagnetization Risk and Local Magnetic Forces in V-Shaped Interior PMSM with Distributed and Concentrated Winding

Energies ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 5125
Author(s):  
Piotr Mynarek ◽  
Janusz Kołodziej ◽  
Adrian Młot ◽  
Marcin Kowol ◽  
Marian Łukaniszyn
Keyword(s):  
Finite Element ◽  
Permanent Magnet ◽  
Short Circuit ◽  
Finite Element Models ◽  
Mechanical Reliability ◽  
Permanent Magnet Motors ◽  
Magnetic Forces ◽  
Radial Flux ◽  
Interior Permanent Magnet ◽  
Short Circuit Fault

This paper presents a comparison of 30/8 and 12/8 AC permanent magnet motors with distributed (DW) and concentrated winding (CW) designed for electric vehicle traction. Both prototypes are based on an interior permanent magnet (IPM) motor topology and contain V-shape magnets. The radial flux AC IPM motors were designed for an 80 kW propulsion system to achieve 125 N·m. Finite element models (FEM) used to design the geometry of IPM motors and the required useful parameters of electric motors are widely investigated. The accuracy of finite element models is verified and validated on the basis of test data. Numerical simulations of healthy and faulty operation states, and studies of winding faults based on the FEM offer a deeper understanding of the associated phenomena. Therefore, in this paper, a short-circuit fault in a stator winding was simulated to investigate the transient currents under an external load collapse, for all winding phases. These simulations were used to define other important machine parameters to improve mechanical reliability of the motors and to assess the potential risk of permanent magnet (PM) demagnetization. Furthermore, the analysis of local magnetic forces affecting the PMs in the rotor and their possible displacement in a short-circuit situation were performed, also taking into account the centrifugal force. Lastly, it is demonstrated that the choice of winding configuration has a significant impact on the uncontrolled displacement of magnets in the rotor.

Analysis of magnetic forces in magnetically saturated permanent magnet motors by considering mechanical and magnetic coupling effects

2002 ◽  
Vol 91 (10) ◽  
pp. 6976 ◽  
Author(s):  
Geun-Bae Hwang ◽  
Sang-Moon Hwang ◽  
Weui-Bong Jung ◽  
Beom-Soo Kang ◽  
I.-Cheol Hwang ◽  
...  
Keyword(s):  
Permanent Magnet ◽  
Magnetic Coupling ◽  
Permanent Magnet Motors ◽  
Coupling Effects ◽  
Magnetic Forces

scholarly journals Analysis of Magnetic Forces in Axial-Flux Permanent-Magnet Motors with Rotor Eccentricity

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Xiaoting Zhang ◽  
Bingyi Zhang
Keyword(s):  
Magnetic Field ◽  
Permanent Magnet ◽  
Air Gap ◽  
Computational Time ◽  
End Effect ◽  
Permanent Magnet Motors ◽  
Axial Flux ◽  
Magnetic Forces ◽  
Rotor Eccentricity ◽  
The Magnetic Field

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.

Sign in / Sign up

Export Citation Format

Share Document