Permanent Magnet Biased Axial-radial Magnetic Bearing Design Based on the Accurate Magnetic Circuit

2020 ◽  
Author(s):  
Shaoliang Zhou ◽  
Min Zhang ◽  
Jian Shen ◽  
Bo Wang ◽  
Xing Zhao ◽  
...  
Keyword(s):  
Permanent Magnet ◽  
Magnetic Circuit ◽  
Magnetic Bearing ◽  
Bearing Design ◽  
Radial Magnetic Bearing

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.

Subdomain Method for Permanent Magnet Biased Homo-Polar Radial Magnetic Bearing

2016 ◽  
Vol 52 (7) ◽  
pp. 1-5 ◽  
Author(s):  
Kang Wang ◽  
Dong Wang ◽  
Yang Shen ◽  
Xianbiao Zhang ◽  
Junquan Chen ◽  
...  
Keyword(s):  
Permanent Magnet ◽  
Magnetic Bearing ◽  
Subdomain Method ◽  
Radial Magnetic Bearing

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.

scholarly journals Stiffness Enhancement of a Superconducting Magnetic Bearing Using Shaped YBCO Bulks

2019 ◽  
Author(s):  
James Storey ◽  
Mathieu Szmigiel ◽  
Fergus Robinson ◽  
Stuart C. Wimbush ◽  
Rod Badcock
Keyword(s):  
Permanent Magnet ◽  
High Speed ◽  
Magnetic Levitation ◽  
Levitation Force ◽  
Lateral Force ◽  
Magnetic Bearing ◽  
Restoring Forces ◽  
Bearing Design ◽  
Lateral Displacements ◽  
Stiffness Characteristics

High-speed superconducting motors and generators<br>stand to benefit from superconductor magnetic levitation bearings if their stiffness characteristics can be improved. Here we investigate a novel thrust bearing geometry, comprising a conical frustum shaped permanent magnet and matching superconducting toroid and puck assembly, aimed at producing high stiffness coupled with high levitation force. To this end, we have constructed a bearing test rig enabling measurements of the levitation force and stiffness of the assembly of YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-d</sub> melt-textured bulks and Nd<sub>2</sub>Fe<sub>14</sub>B permanent magnet at temperatures down to 47 K. The experimental results are supported by finite element modeling that is validated against the experiment, and used to quantify the advantages of this configuration over a conventional cylindrical magnet and HTS puck arrangement.<br>For axial displacements, the assembly produces higher and more consistent stiffness together with stronger restoring forces. For lateral displacements, the assembly produces up to double the lateral force and up to four times the stiffness. Our study also shows that the force contribution to the assembly from the small inner puck is negligible and it can therefore be eliminated from the bearing design.

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.

Magnetic Bearing Design for Reduced Power Consumption

1996 ◽  
Vol 118 (4) ◽  
pp. 839-846 ◽  
Author(s):  
E. H. Maslen ◽  
P. E. Allaire ◽  
M. D. Noh ◽  
C. K. Sortore
Keyword(s):  
Power Consumption ◽  
Permanent Magnet ◽  
Gas Turbines ◽  
Load Capacity ◽  
Magnetic Bearing ◽  
Magnetic Bearings ◽  
Fluid Film ◽  
Total Power ◽  
Total Power Consumption ◽  
Bearing Design

Magnetic bearings have relatively low power consumption compared to fluid film and rolling element bearings. They are now candidates for supporting gas turbines and aeropropulsion engines. This paper describes the design and construction of permanent magnet biased, actively controlled magnetic bearings for a flexible rotor. The rotor was originally supported in fluid film bearings consuming as much as 3000 watts of power. For the magnetic bearing, both permanent magnets and electromagnets are used in a configuration which effectively provides the necessary fluxes in the appropriate air gaps to support the rotor. The theoretical development related to the bearing design is presented along with some experimental performance results. The results include measurements of power consumption, load capacity, bearing linearized coefficients, and the dynamic response of the rotor. The measured total power consumption, excluding shaft losses, was 210 watts in the permanent magnet biased bearing.

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