Modeling and analysis of E-Core permanent magnet biased radial magnetic bearing

2015 ◽  
Vol 49 (2) ◽  
pp. 179-193
Author(s):  
Huijun Wang ◽  
Bingkun Xue ◽  
Shaofei Tang
Keyword(s):  
Permanent Magnet ◽  
Magnetic Bearing ◽  
Modeling And Analysis ◽  
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

Modeling and analysis of a novel conical magnetic bearing for vernier-gimballing magnetically suspended flywheel

2013 ◽  
Vol 228 (13) ◽  
pp. 2416-2425 ◽  
Author(s):  
Jiancheng Fang ◽  
Chune Wang ◽  
Jiqiang Tang
Keyword(s):  
Permanent Magnet ◽  
Degrees Of Freedom ◽  
Magnetic Coupling ◽  
Magnetic Bearing ◽  
Modeling And Analysis ◽  
Control Moment ◽  
Novel Structure ◽  
Force Coupling ◽  
Conical Structure ◽  
The Mathematical Model

The vernier-gimballing magnetically suspended flywheel can generate control moment in radial directions by tilting the spinning rotor to rotate around the radial axes. In order to reduce the extra tilting torque caused by the uniform distribution of flux density and the magnetic coupling among different channels, a novel 3 degrees of freedom conical permanent-magnet-biased magnetic bearing is proposed in the paper. The axial and radial stators are both designed with the normal directions of the midst faces directing to the centroid of the rotor, so as to decrease the extra torque by shortening the length of torque arm. A novel structure of radial X and Y stator poles separated by nonmagnetic material is proposed, and the upper and lower conical stators are designed to be mirror structures with each other, so that the magnetic coupling can be reduced. The mathematical model of the proposed permanent-magnet-biased magnetic bearing is constructed by methods of equivalent magnetic circuit and finite element. Calculations and simulations are carried out on the suspension force, extra tilting torque, and force coupling. The results show that with the conical structure, the extra tilting torque can be decreased from 10.83 Nm to 0.11 Nm when the rotor tilts around X axis for 1°. The magnetic forces among X, Y, and Z directions are almost decoupled even when the rotor shifts in some direction. All the results prove that the novel permanent-magnet-biased magnetic bearing is suitable for application in vernier-gimballing magnetically suspended flywheel.

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