scholarly journals An integrated magnetic circuit model and finite element model approach to magnetic bearing design

2005 ◽  
Author(s):  
A. Kenny ◽  
A.B. Palazzolo ◽  
A. Provenza
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Magnetic Circuit ◽  
Element Model ◽  
Magnetic Bearing ◽  
Circuit Model ◽  
Bearing Design ◽  
Model Approach

scholarly journals A Novel, Improved Equivalent Circuit Model for Double-Sided Linear Induction Motor

Electronics ◽  
2021 ◽  
Vol 10 (14) ◽  
pp. 1644
Author(s):  
Qian Zhang ◽  
Huijuan Liu ◽  
Tengfei Song ◽  
Zhenyang Zhang
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Equivalent Circuit ◽  
Skin Effect ◽  
Equivalent Circuit Model ◽  
Element Model ◽  
Circuit Model ◽  
End Effects ◽  
3D Finite Element ◽  
Linear Induction

A novel, improved equivalent circuit model of double-sided linear induction motors (DLIMs) is proposed, which takes the skin effect and the nonzero leakage reactance of the secondary, longitudinal, and transverse end effects into consideration. Firstly, the traditional equivalent circuit with longitudinal and transverse end effects are briefly reviewed. Additionally, the correction coefficients for longitudinal and transverse end effects derived by one-dimensional analysis models are given. Secondly, correction factors for skin effect, which reflects the inhomogeneous air gap magnetic field vertically, and the secondary leakage reactance are derived by the quasi-two-dimensional analysis model. Then, the proposed equivalent circuit is presented, and the excitation reactance and secondary resistance are modified by the correction coefficients derived from the three analytical models. Finally, a three-dimensional (3D) finite element model is used to verify the proposed equivalent circuit model under varying air gap width and frequency, and the results are also compared with that of the traditional equivalent circuit models. The calculated thrust characteristics by the proposed equivalent circuit and 3D finite element model are experimentally validated under a constant voltage–frequency drive.

scholarly journals A Circuit Model for CMOS Hall Cells Performance Evaluation including Temperature Effects

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Maria-Alexandra Paun ◽  
Jean-Michel Sallese ◽  
Maher Kayal
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Circuit Model ◽  
Physical Parameters ◽  
Geometrical Parameters ◽  
Voltage Sensitivity ◽  
Behavior Simulation ◽  
Different Shapes ◽  
Lumped Circuit Model

In order to provide the information on their Hall voltage, sensitivity, and drift with temperature, a new simpler lumped circuit model for the evaluation of various Hall cells has been developed. In this sense, the finite element model proposed by the authors in this paper contains both geometrical parameters (dimensions of the cells) and physical parameters such as the mobility, conductivity, Hall factor, carrier concentration, and the temperature influence on them. Therefore, a scalable finite element model in Cadence, for behavior simulation in circuit environment of CMOS Hall effect devices, with different shapes and technologies assessing their performance, has been elaborated.

Calculation of Leakage Coefficient for Hybrid Magnetic Bearing

2012 ◽  
Vol 150 ◽  
pp. 17-23 ◽  
Author(s):  
Er Yong Hou ◽  
Kun Liu
Keyword(s):  
Mathematical Model ◽  
Finite Element ◽  
Magnetic Circuit ◽  
Element Model ◽  
Practical Method ◽  
Magnetic Bearing ◽  
The Finite Element Method ◽  
Magnetic Forces ◽  
Working Principle ◽  
Leakage Coefficient

This paper proposes a novel radial hybrid magnetic bearing (RHMB), whose configuration and working principle are introduced, and its mathematical model is built using the equivalent magnetic circuit method. A simple and practical method for calculating leakage coefficients is proposed to improve the accuracy of the equivalent magnetic circuit method. A 3-D finite element model of the RHMB is established by the software ANSYS and the leakage coefficients of control and bias fluxes are calculated, respectively. Based on the obtained leakage coefficients, magnetic forces on the rotor are calculated using the equivalent magnetic circuit method, and the results are compared with those of experiments and the finite element method. It shows that the magnetic forces obtained using the three methods are in agreement with each other, which verifies the correction of the proposed method in the calculation of leakage coefficients.

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