Evaluation of the mechanical deformation in incompressible linear and nonlinear magnetic materials using various electromagnetic force density methods

2005 ◽  
Vol 97 (10) ◽  
pp. 10E108 ◽  
Author(s):  
Se-Hee Lee ◽  
Xiaowei He ◽  
Do-Kyung Kim ◽  
Shihab Elborai ◽  
Hong-Soon Choi ◽  
...  
Keyword(s):  
Magnetic Materials ◽  
Electromagnetic Force ◽  
Mechanical Deformation ◽  
Force Density ◽  
Linear And Nonlinear ◽  
Density Methods

Analysis of Vibration Caused by Electromagnetic Force on Stator End-Winding of Large Dry Submersible Motor

2013 ◽  
Vol 416-417 ◽  
pp. 428-432
Author(s):  
Li Shan ◽  
Xiao Wei Cheng ◽  
Yong Fang ◽  
Xiao Hua Bao
Keyword(s):  
Electromagnetic Field ◽  
Steady State ◽  
Transition State ◽  
Electromagnetic Force ◽  
Radial Displacement ◽  
Radial Direction ◽  
Axial Direction ◽  
Axial Displacement ◽  
Force Density ◽  
Submersible Motor

This paper investigates the vibration which caused by electromagnetic on the stator end-winding of the large dry submersible motor. Firstly, the electromagnetic field which included transition state and steady state is researched by 3-D FEM. Secondly, the electromagnetic force which lead to vibrations of end-winding is calculated by numerical method, it can be obtained that where endured the largest force density along the slant part of end-winding. Finally, the radial displacement and the axial displacement of the slant part which caused by vibrations is studied, the analysis results show that the axial displacement is larger than the amplitude of radial displacement. It indicates that the slant part of end-winding will be more easily damaged at axial direction than radial direction.

scholarly journals A Comprehensive Analysis on Transient Electromagnetic Force Behavior of Stator Windings in Turbo-Generator

2018 ◽  
Vol 2018 ◽  
pp. 1-16 ◽  
Author(s):  
Hong-Chun Jiang ◽  
Yu-Ling He ◽  
Gui-Ji Tang ◽  
Ming-Xing Xu
Keyword(s):  
Electromagnetic Force ◽  
Mechanical Response ◽  
Comprehensive Analysis ◽  
Simplified Model ◽  
Force Density ◽  
Stator Core ◽  
Stator Windings ◽  
Fea Model ◽  
Transient Electromagnetic ◽  
Turbo Generator

This paper presents a comprehensive analysis on the transient electromagnetic force behavior of the stator windings in a QFSN-600-2YHG type turbo-generator. Different from other studies, this paper investigates not only the distribution regularities of the resultant force and the force density, but also the force harmonic characteristics, and the mechanical responses which will cause sensitive impact on the insulation wearing. The whole work is generally based on a proposed simplified model and the 3D finite element coupling calculation. The simplified model contains two parts. The first part is the theoretical model that employs the approximate solution of the image current to obtain the analytic formula of the electromagnetic force on the end windings conveniently. The second part is the FEA model that employs only the end windings and one-tenth of the stator core to save the calculating memory and, meanwhile, obtain the qualified electromagnetic force as well as the mechanical response. It is shown that the nose-top, the connection point between the line part and the end part, and the middle of the involute are the three most dangerous positions of the end winding to sustain serious insulation wearing. Moreover, the winding, which endures the maximum mechanical response, is neither always consistent with the one that has the largest resultant electromagnetic force nor directly in accordance with the winding that affords the most intensive electromagnetic force density. The findings in this paper will be beneficial for the insulation monitoring and the manufacturing improvement on the stator windings.

Electromagnetic Force Density in a Ferromagnetic Material

2004 ◽  
Vol 40 (2) ◽  
pp. 553-556 ◽  
Author(s):  
F. Henrotte ◽  
H.V. Sande ◽  
G. Deliege ◽  
K. Hameyer
Keyword(s):  
Electromagnetic Force ◽  
Ferromagnetic Material ◽  
Force Density

AXIAL ELECTROMAGNETIC FORCE DENSITY IN MPD THRUSTERS

1992 ◽  
Vol 06 (23) ◽  
pp. 1465-1474
Author(s):  
T.S. SHESHADRI
Keyword(s):  
Density Distribution ◽  
Axial Force ◽  
Electromagnetic Force ◽  
Mass Density ◽  
Force Density ◽  
Viscous Effects ◽  
Inlet Velocity ◽  
Large Force ◽  
Hall Parameter ◽  
Mpd Thrusters

An MPD thruster formulation involving coupled aerothermodynamic-electromagnetic equations and including viscous effects is developed and solved. The electromagnetic force density distribution in the thruster interior is studied. Axial force densities are found to be largest on the cathode longitudinal surface. Very large force densities are found at the cathode upstream end and this is attributed to large values of the Hall parameter. Over the rest of the cathode longitudinal surface, axial force densities increase with increasing inlet velocities and mass densities and larger plasma viscosities. Equivalent increases in inlet velocity and mass density produce effects of different magnitudes.

Numerical Identification of Electromagnetic Force Parameters for Linearized Rotordynamic Model of Cage Induction Motors

2003 ◽  
Author(s):  
Timo P. Holopainen ◽  
Asmo Tenhunen ◽  
Erkki Lantto ◽  
Antero Arkkio
Keyword(s):  
Magnetic Materials ◽  
Electromagnetic Force ◽  
Induction Motors ◽  
Parametric Model ◽  
Theoretical Background ◽  
Response Analysis ◽  
Electromagnetic System ◽  
Impulse Method ◽  
Electromechanical Interaction ◽  
Rotor Model

The electromechanical interaction in cage induction motors induces additional forces between the rotor and stator. Recently, a linear parametric model was presented for these forces, and the corresponding model was combined with a mechanical rotor model. The electromagnetic system is usually non-linear due to the saturation of magnetic materials. Thus, the effective identification of the force parameters is crucial. Initially, the parameters were identified numerically from the response induced by the whirling rotor. Later on, a method based on the impulse response analysis was presented. The aim of this study was to present the theoretical background of this impulse method, and to present some useful additional features. The derived equations show the mathematical equivalency of this impulse method and the previous whirling method. The results show that the impulse method is numerically effective. In addition, the feasibility of thus obtained simple electromechanical rotor model was demonstrated.

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