Effect of Magnetic Saturation On the Air-Gap Flux Density Wave in Polyphase Induction Machines

1988 ◽  
pp. 193-198
Author(s):  
Mirosław I. Dąbrowski
Keyword(s):  
Flux Density ◽  
Density Wave ◽  
Induction Machines ◽  
Air Gap ◽  
Magnetic Saturation

Effect of Stator Insulation Failure on the Motor Drive System Performance

2021 ◽  
Vol 35 (11) ◽  
pp. 1370-1371
Author(s):  
Hassan Eldeeb ◽  
Haisen Zhao ◽  
Osama Mohammed
Keyword(s):  
Flux Density ◽  
System Performance ◽  
Induction Machines ◽  
Air Gap ◽  
Drive System ◽  
Self Control ◽  
Motor Drive ◽  
Iron Core ◽  
Insulation Failure ◽  
Motor Drive System

This study investigates the influence of the stator’s turn-to-turn failures (TTFs) on the electromagnetic (EM) fields, such as air gap flux density, flux density in the stator, and rotor iron core inside of direct self-control (DSC) driven induction machines (IMs). The purpose of the investigation is to capture the fault signatures in the air gap EM flux for detecting the stator’s fault at its embryonic stage.

A novel mathematical model of bearingless switched reluctance motor considering air-gap edge effect

2017 ◽  
Vol 36 (1) ◽  
pp. 108-128 ◽  
Author(s):  
Ling Chen ◽  
Honghua Wang ◽  
Chao Tan
Keyword(s):  
Mathematical Model ◽  
Mathematical Models ◽  
Flux Density ◽  
Edge Effect ◽  
Air Gap ◽  
Magnetic Saturation ◽  
Content Type ◽  
Switched Reluctance ◽  
Coupling Relationship ◽  
Rotor Poles

Purpose This paper aims to propose a novel mathematical model of bearingless switched reluctance motor (BSRM). This model differs from conventional mathematical models in the calculation of torque and suspension forces. Conventional mathematical models neglect the coupling relationship between the α- and β-axes or ignore the magnetic saturation of the Si-Fe material. This study considers these issues simultaneously. Additionally, considering the air-gap edge effect, the fringing coefficient is used to establish a high-precision mathematical model. Design/methodology/approach An innovative mathematical model of BSRM based on the Maxwell stress method was established by selecting an appropriate integration path. The fringing coefficient of the air-gap was computed based on the finite element analysis results at the aligned position of the stator and rotor poles. Using the least squares fitting method, the piecewise fitted magnetization curve of the Si-Fe material was utilized to calculate flux density. Findings The appropriate integration path of the Maxwell stress method was selected, which considered the coupling relationship of the suspension forces in the α- and β-axes and was closer to the actual situation. The fringing coefficient of the air-gap improved the calculation accuracy of air-gap flux density. The magnetomotive force was consumed by the magnetic resistance of the stator and rotor poles considering the magnetic saturation. Originality/value A novel mathematical model of BSRM is proposed. Different from conventional mathematical models, the proposed model can effectively solve the coupling relationship of the suspension forces in the α- and β-axes. Additionally, this model is consistent with the actual situation of motor as it includes a reasonable calculation of the air-gap flux density, considering the air-gap edge effect and magnetic saturation.

Flux density calculation of air gap for switched reluctance motor considering magnetic saturation based on sub-domain method

2018 ◽  
Vol 37 (6) ◽  
pp. 2081-2092
Author(s):  
Xianhai Pang ◽  
Haijun Zhang ◽  
Shuhong Wang ◽  
Hao Jing
Keyword(s):  
Magnetic Field ◽  
Magnetic Flux ◽  
Flux Density ◽  
Switched Reluctance Motor ◽  
Air Gap ◽  
Magnetic Flux Density ◽  
Magnetic Saturation ◽  
Content Type ◽  
Switched Reluctance ◽  
Reluctance Motor

Purpose The purpose of this paper is to study the saturation and nonlinear performance of magnetic field in the air gap of switched reluctance motor (SRM). Design/methodology/approach The analytical method of sub-domain combined with the saturation compensation method is used to determine the nonlinear distribution of air gap magnetic field in SRM. Also, the resolutions of the two-dimensional (2D) Laplace’s equation and Poisson’s equation in polar coordinates are used to obtain the simplified expression of magnetic flux density. Findings For verifying the effectiveness of analytical model, the results are compared with those obtained from the 2D finite element method (FEM). The influence of magnetic saturation is taken into account by associating the sub-domain analysis result with the nonlinear B-H properties of stator and rotor iron. The magnetic flux density in radial and tangential direction considering the saturation effect may be calculated accurately. It can be seen that one can easily determine the linear analytical results accurately, whereas it is difficult to determine the magnetic flux density with saturation influence; especially at some local positions, there is a larger difference between analytical and FE model due to the complex boundary conditions. Practical implications This paper presents the development and optimization design of high-performance SRM. Originality/value The magnetic saturation may be taken into account for the SRM and analytical models support to simulated system performance.

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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