Study on a Permanent Magnet Bias Axial Magnetic Bearing

2013 ◽  
Vol 441 ◽  
pp. 253-257
Author(s):  
Xu Sheng Zhao ◽  
Jian Li
Keyword(s):  
Permanent Magnet ◽  
Carrying Capacity ◽  
Magnetic Circuit ◽  
Magnetic Bearing ◽  
Theory Analysis ◽  
Finite Element Software ◽  
Magnetic Field Simulation ◽  
Capacity Current ◽  
Simulation Results ◽  
The Magnetic Field

A permanent magnet bias axial magnetic bearing (PAMB) is introduced, the configuration and operation principle are analyzed; The equivalent magnetic circuit is established, the math expression of axial suspension force and some equations for carrying capacity, current stiffness and displacement stiffness are deduced; The parameters of the proposed prototype are also given. The magnetic field simulation is performed by using the Finite Element software. The theory analysis and the simulation results show that the presented PAMB has smaller volume, the control is easier; the parameters design is feasible and exact.

Structure and Finite Element Analysis for a Permanent Magnet Bias Axial Magnetic Bearing

2011 ◽  
Vol 383-390 ◽  
pp. 4803-4809
Author(s):  
Xu Sheng Zhao ◽  
Zhi Quan Deng ◽  
Bo Wang ◽  
Chun Hua
Keyword(s):  
Finite Element ◽  
Permanent Magnet ◽  
High Speed ◽  
Magnetic Bearing ◽  
Magnetic Suspension ◽  
Low Loss ◽  
Theory Analysis ◽  
Element Analysis ◽  
Finite Element Software ◽  
Magnetic Field Simulation

A new permanent magnet bias axial magnetic bearing (PMAB) is introduced, then the structure and operation principle are analyzed. The equivalent magnetic circuit is established to deduce the mathematic expression. The parameter design and calculation of the magnetic bearing are presented including available area of magnetic pole, ampere - turns of control coils etc. The parameters of the proposed prototype are also given. The 3-D magnetic field simulation is performed by using the Finite Element software. The theory analysis and the simulation show that the maximum suspension magnetic force satisfies the design requirement. The magnetic suspension forces have better linearity and symmetry around the balanced position. Therefore, the proposed PMAB is suitable for the high speed or low loss occasions.

Research on Leakage Permeance Calculation of Bar Permanent Magnet in Open Magnetic Circuit

2014 ◽  
Vol 525 ◽  
pp. 292-296
Author(s):  
Hui Min Liang ◽  
Jia Xin You ◽  
Yong Xie ◽  
Guo Fu Zhai
Keyword(s):  
Permanent Magnet ◽  
Magnetic Circuit ◽  
Magnetic System ◽  
Simulation Method ◽  
High Accuracy ◽  
The Finite Element Method ◽  
Magnetic Field Simulation ◽  
Magnetic Model ◽  
Calculation Results ◽  
The Magnetic Field

For electric magnetic system which contains permanent magnet, its calculation results often has a low level accuracy when using equivalent circuit method .The calculation method of permanent magnet leakage permeance is the key point and needs to be improved. The leakage permeance calculation formulas of bar type permanent magnet are deduced. The magnetic field simulation method and analytical method for calculating leakage permeance of bar type permanent magnet in open magnetic circuit are investigated based on the finite element method. An example is given and the results are validated by experiment. The methods and results can be used to found the equivalent magnetic model with high accuracy.

Magnetic Field Analysis of Surface-Mounted Permanent-Magnet Motors

2011 ◽  
Vol 52-54 ◽  
pp. 285-290
Author(s):  
Yi Chang Wu ◽  
Feng Ming Ou ◽  
Bo Wei Lin
Keyword(s):  
Magnetic Field ◽  
Permanent Magnet ◽  
Magnetic Circuit ◽  
Circuit Model ◽  
Field Analysis ◽  
Permanent Magnet Motors ◽  
Element Analysis ◽  
Magnetic Field Analysis ◽  
Field Estimation ◽  
The Magnetic Field

The prediction of the magnetic field is a prerequisite to investigate the motor performance. This paper focuses on the magnetic field estimation of surface-mounted permanent-magnet (SMPM) motors based on two approximations, i.e., the magnetic circuit analysis and the finite-element analysis (FEA). An equivalent magnetic circuit model is applied to analytically evaluate the magnetic field of a SMPM motor with exterior-rotor configuration. The two-dimensional FEA is then applied to numerically calculate the magnetic field and to verify the validity of the magnetic circuit model. The results show that the errors between the analytical predictions and FEA results are less than 6%. It is of benefit to further design purposes and optimization of SMPM motors.

Stiffness Measurement of Permanent Magnet Biased Radial Magnetic Bearing in MSFW

2015 ◽  
Vol 137 (9) ◽  
Author(s):  
Sun Jinji ◽  
Bai Guochang ◽  
Yang Lei
Keyword(s):  
Permanent Magnet ◽  
Measurement Method ◽  
Magnetic Circuit ◽  
Magnetic Bearing ◽  
Stiffness Measurement ◽  
Stiffness Characteristics ◽  
Radial Magnetic Bearing ◽  
The Relationship ◽  
Magnetic Center

To measure current stiffness and displacement stiffness of permanent magnet biased radial magnetic bearing, a new stiffness measurement method is proposed for magnetically suspended flywheel (MSFW). The detailed stiffness measurement method is proposed in this paper. At first, the suspension force and stiffness characteristics of the permanent magnet biased radial magnetic bearing are studied using magnetic circuit method and finite element method (FEM). Second, the detailed stiffness measurement method of permanent magnet biased radial magnetic bearing is proposed. It has two procedures, one is the determination of the magnetic center in radial magnetic bearing when the gravity of rotor is in the +x(+y) direction and −x(−y) direction, respectively, then the current stiffness can be obtained, and the other is the calculation of the displacement stiffness according to the relationship between rotor displacement and current. A prototyped MSFW with angular moments of 50 Nms is manufactured, and the proposed stiffness measurement method of permanent magnet biased radial magnetic bearing is verified by prototyped experiments.

Design of a wave energy converter based on Halbach magnetic array

2020 ◽  
Vol 64 (1-4) ◽  
pp. 1227-1236
Author(s):  
Zhang Yuxiang ◽  
Chen Renwen ◽  
Liu Chuan
Keyword(s):  
Permanent Magnet ◽  
Wave Energy ◽  
Magnetic Circuit ◽  
Structural Parameters ◽  
Circuit Model ◽  
Wave Energy Converter ◽  
Low Carbon ◽  
Energy Converter ◽  
Finite Element Software ◽  
Array Structures

With the continuous development of society and economy, people’s demand for electric energy is increasing. The low-carbon and energy-saving technologies of renewable energy especially wave energy have become the focus of current researches. Considering the increasingly serious energy problems, a wave energy converter (WEC) is proposed based on Halbach permanent magnetic array, which increases the output performance. The equivalent magnetic circuit model of the WEC is established. The static magnetic field modeling and structural parameters optimal permanent of the WEC are performed on this theoretical. Theoretical studies have found that the optimal permanent magnet thickness ratios for Halbach permanent magnet array structures is 0.6, and the ratio of permanent magnet to coil radial ratio is 0.7. The coil winding form and rectifying circuit of the WEC were designed. The WEC equivalent magnetic circuit model was verified by COMSOL Multiphysics finite element software, and the open circuit voltages of WEC was obtained. If the WEC moves at a speed of 0.1 m/s, the coil voltage can reach about 113 V after simulation. According to the testing requirements of the WEC, a test platform was built. The Halbach permanent magnet array structures greatly enhances the wave energy collection of WEC.

A Nonlinear Magnetic Circuit Analysis of a Permanent Magnet Biased Homopolar Bearing

1999 ◽  
Author(s):  
Andrew Kenny ◽  
Alan Palazzolo
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Permanent Magnet ◽  
Analytical Methods ◽  
Magnetic Circuit ◽  
Three Dimensional ◽  
Magnetic Bearing ◽  
Axial Flux ◽  
Element Analysis ◽  
Good Agreement

Abstract A magnetic circuit model for a homopolar magnetic bearing is presented. This model connects the fore and aft circumferential flux paths with axial flux paths through the rotor and back iron. The bias flux is provided by a circumferential permanent magnet in the back iron. Results for an analysis using the nonlinear Hyperco50 B-H curve are presented. These results are compared to the results of a three dimensional magnetostatic finite element analysis. The two analytical methods are in good agreement and show that the control flux in this type of bearing follows both circumferential and axial paths.

Permanent Magnet Biased Bearing of Suspension System

2011 ◽  
Vol 383-390 ◽  
pp. 5529-5535
Author(s):  
Ming Zong ◽  
Xiao Kang Wang ◽  
Yang Cao
Keyword(s):  
Magnetic Field ◽  
Mathematical Model ◽  
Permanent Magnet ◽  
Power Amplifier ◽  
Model Simulation ◽  
Simulation Method ◽  
Magnetic Bearing ◽  
Magnetic Bearings ◽  
Active Magnetic Bearing ◽  
Simulation Results

PM (Permanent Magnet) biased magnetic bearing with PM to replace the magnetic field produced by electromagnet an Active Magnetic Bearing generated static bias magnetic field, it can reduce the power consumption of power amplifier to reduce the number of turns of magnet safety, reduce the volume of magnetic bearings, reducing electromagnetic coil operating current, thereby reducing the power amplifier power control system and heat sink size, magnetic bearings significantly reduce power loss, and fundamentally reduce the cost of bearing. In this paper, a kind of PM biased magnetic bearings, describes its structure and working principle, derived a mathematical model of magnetic bearing and magnetic circuit of PM biased magnetic bearings are calculated, given the specific PM biased magnetic bearing size and accordingly calculate the parameters of magnetic bearings. A magnetic model constructed using Simulink simulation method, and constructed using this method, magnetic bearing specific mathematical model simulation results show that the rotor position in the balance, X and Y decoupling between the control winding, while the deviation from equilibrium position time, X and Y control coupling between the windings, the simulation results and the calculation results.

scholarly journals Theoretical Computational Model for Cylindrical Permanent Magnet Coupling

Electronics ◽  
2021 ◽  
Vol 10 (16) ◽  
pp. 2026
Author(s):  
Ke Sun ◽  
Jianwen Shi ◽  
Wei Cui ◽  
Guoying Meng
Keyword(s):  
Magnetic Field ◽  
Computational Model ◽  
Permanent Magnet ◽  
Test Bench ◽  
Magnetic Circuit ◽  
Element Simulation ◽  
Current Characteristics ◽  
Induce Eddy Current ◽  
Air Gap Magnetic Field ◽  
The Magnetic Field

Permanent magnet coupling is extensively studied owing to its economic efficiency and stability. In this study, a computational model for cylindrical permanent magnet coupling (CPMC) was designed using the magnetic field division method to divide an air gap magnetic field. An equivalent magnetic circuit model was also designed based on the equivalent magnetic circuit method. The novelty of this study is that both the skin effect and the working point of the permanent magnet are taken into consideration to obtain the magnetic circuit and induce eddy current characteristics of permanent magnet coupling. Furthermore, a computational model was obtained for the transmission torque of the CPMC based on the principles of Faraday’s and Ampere’s laws. Additionally, the accuracy of the model was verified using a finite element simulation model and a test bench.

scholarly journals Analysis and optimisation of an axial flux permanent magnet coreless motor based on the field model using the superposition principle and genetic algorithm

2016 ◽  
Vol 65 (3) ◽  
pp. 601-611 ◽  
Author(s):  
Rafał M. Wojciechowski
Keyword(s):  
Magnetic Field ◽  
Permanent Magnet ◽  
Field Model ◽  
Superposition Principle ◽  
Electromagnetic Torque ◽  
Axial Flux ◽  
Magnetic Field Simulation ◽  
Field Distributions ◽  
Field Simulation ◽  
The Magnetic Field

Abstract In the paper, methodologies for the magnetic field simulation in an axial flux permanent magnet coreless (AFPMC) motor have been proposed and discussed. Two approaches have been considered and investigated, both based on representing the 3D field distribution by superimposing axisymmetric 2D patterns. The first of studied approaches applies directly to the Biot-Savart law while the second uses a 2D axisymmetric finite element method. The selected results of magnetic field distributions and electromagnetic torque characteristics for the considered AFPMC motor have been presented and compared with results obtained using the commercial FEM package ‘Maxwell’. The elaborated algorithms have been incorporated into the design routines allowing multi-parameter optimisation of the considered motor construction.

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