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.

Analysis of magnetic force and dynamic characteristic for non-contact permanent magnet linear drive device

2020 ◽  
Vol 64 (1-4) ◽  
pp. 1337-1345
Author(s):  
Chuan Zhao ◽  
Feng Sun ◽  
Junjie Jin ◽  
Mingwei Bo ◽  
Fangchao Xu ◽  
...  
Keyword(s):  
Finite Element ◽  
Permanent Magnet ◽  
Dynamic Characteristic ◽  
Driving Force ◽  
Magnetic Circuit ◽  
Response Speed ◽  
Computation Method ◽  
Element Analysis ◽  
Element Simulation ◽  
The Relationship

This paper proposes a computation method using the equivalent magnetic circuit to analyze the driving force for the non-contact permanent magnet linear drive system. In this device, the magnetic driving force is related to the rotation angle of driving wheels. The relationship is verified by finite element analysis and measuring experiments. The result of finite element simulation is in good agreement with the model established by the equivalent magnetic circuit. Then experiments of displacement control are carried out to test the dynamic characteristic of this system. The controller of the system adopts the combination control of displacement and angle. The results indicate that the system has good performance in steady-state error and response speed, while the maximum overshoot needs to be reduced.

Improving the operation of the linear electromagnetic step device.

2020 ◽  
Vol 23 (2) ◽  
pp. 38-43
Author(s):  
V. SMOLIANINOV ◽  
◽  
A. SUKHOPARA ◽  
Keyword(s):  
Magnetic Circuit ◽  
Design Parameters ◽  
Electrical Parameters ◽  
Resistance Change ◽  
Electromagnetic Device ◽  
Mobile Link ◽  
Magnetic Resistance ◽  
Relationship Of ◽  
The Relationship

The improved operation of the linear electromagnetic device (LED) is proposed, without the use of additional sensors for control motion of mobile link LED and automation of technological process. Research focused on determination of the relationship of changes in active inductive parameters of the LED with its design parameters when moving the mobile link of LED and construction an improving the operation, that controls these changes for the increasing the efficiency of their functioning. For this research a theories of electrical circuits and electronic circuits were implemented, which takes into account the change in electrical parameters when moving the mobile link of the linear electromagnetic device. It is proved the dependence of the magnetic resistance in certain sections of the magnetic circuit from the position the mobile link and the design parameters of the LED, the intervals of the magnetic resistance change when the mobile link is moved by the size of the step. The accordance is found between the change in active - inductive parameters when the position of the moving link

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.

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