Analysis of the Levitation Force of Radial-type High-TC Superconducting Magnetic Bearings using a Halbach Permanent Magnet

2004 ◽  
Vol 39 (2) ◽  
pp. 48-53
Author(s):  
Makoto HIROSE ◽  
Hidetoshi NASU ◽  
Hirofumi TAKABAYASHI ◽  
Mitsutoshi NATSUMEDA
Keyword(s):  
Permanent Magnet ◽  
Levitation Force ◽  
Magnetic Bearings ◽  
High Tc

scholarly journals Progress in the Levitation Force of Radial-type High-TC Superconducting Magnetic Bearings

2004 ◽  
Vol 39 (2) ◽  
pp. 42-47
Author(s):  
Makoto HIROSE ◽  
Masayuki ISONO ◽  
Keiji YOSHII ◽  
Hidetoshi NASU
Keyword(s):  
Levitation Force ◽  
Magnetic Bearings ◽  
High Tc

Magnetic bearings using high Tc superconductorsconfigurations and first results

Cryogenics ◽  
1994 ◽  
Vol 34 ◽  
pp. 843-846 ◽  
Author(s):  
P. Hiebel ◽  
P. Tixador ◽  
Y. Brunet
Keyword(s):  
Magnetic Bearings ◽  
High Tc ◽  
First Results

Control-oriented modeling for the electrodynamic levitation with permanent magnet Halbach array

2021 ◽  
pp. 1-19
Author(s):  
Yongpan Hu ◽  
Zhiqiang Long ◽  
Yunsong Xu ◽  
Zhiqiang Wang
Keyword(s):  
Permanent Magnet ◽  
Controller Design ◽  
Levitation Force ◽  
Model Based ◽  
Halbach Array ◽  
Validation Experiment ◽  
Electromagnetic Models ◽  
Two Stages ◽  
Poor Stability ◽  
Maximum Minimum

Poor stability of the permanent magnet electrodynamic levitation hinders its application in the maglev field. Therefore, building a control-oriented model to improve its stability is most challenging. However, intractable electromagnetic models leading to an implicit relationship between levitation force and gap, yields a barrier for model-based controller design. To solve the above-mentioned problem, this paper develops a control-oriented model by two stages. Specifically, the first stage is to show an explicit formula of the levitation force with regard to the levitation gap by neglecting end effect; meanwhile the “maximum–minimum rectification” method is put forward to evaluating an accurate levitation force. The second stage is to bring forth the control-oriented model on basis of the estimated levitation force. Although the paper focus mainly on the development of the control-oriented model, an example of PD controller is provided to verify its validation. Experiment results demonstrate the estimated levitation force is highly consistent with the real one. Simulation results show that the control-oriented model is sufficiently reliable. The research bridges the gap between the physical model and the model-based controller for the electrodynamic levitation with permanent magnet Halbach array.

Passive Magnetic Bearings: Low Instability and Possible Stability

2005 ◽  
Author(s):  
R. Bassani ◽  
E. Ciulli
Keyword(s):  
Permanent Magnet ◽  
Magnetic Bearings ◽  
Static Instability ◽  
Static Conditions

Permanent magnet bearings and systems offer negligible friction and no wear, but static instability too. Nevertheless, spaces of low static instability exhist, and stability may be possible in non static conditions.

Design and analysis of a high speed double-sided axial flux permanent magnet motor suspended vertically by magnetic bearings

2020 ◽  
pp. 1-15
Author(s):  
Ömer Faruk Güney ◽  
Ahmet Çelik ◽  
Ahmet Fevzi Bozkurt ◽  
Kadir Erkan
Keyword(s):  
Permanent Magnet ◽  
High Speed ◽  
Permanent Magnets ◽  
Mechanical Analysis ◽  
Magnetic Bearings ◽  
Permanent Magnet Motor ◽  
Axial Flux ◽  
Element Analysis ◽  
Shaft System ◽  
Rotor Disk

This paper presents the electromagnetic and mechanical analysis of an axial flux permanent magnet (AFPM) motor for high speed (12000 rpm) rotor which is vertically suspended by magnetic bearings. In the analysis, a prototype AFPM motor with a double-sided rotor and a coreless stator between the rotors are considered. Firstly, electromagnetic analysis of the motor is carried out by using magnetic equivalent circuit method. Then, the rotor disk thickness is determined based on a rotor axial displacement due to the attractive force between the permanent magnets placed on opposite rotor disks. Hereafter, an analytical solution is carried out to determine the natural frequencies of the rotor-shaft system. Finally, 3D finite element analysis (FEA) is carried out to verify the analytical results and some experimental results are given to verify the analytical and numerical results and prove the stable high-speed operation.

Effect of Magnet Moving Speed on the Relaxation Rate of the Levitation Force for YBCO Bulk

2007 ◽  
Vol 546-549 ◽  
pp. 2103-2106 ◽  
Author(s):  
X.L. Wu ◽  
W.M. Yang ◽  
S.H. Zhu ◽  
J.Z. Guo ◽  
T.N. Lu ◽  
...  
Keyword(s):  
Relaxation Rate ◽  
Permanent Magnet ◽  
Measurement System ◽  
Levitation Force ◽  
Force Measurement ◽  
Single Domain ◽  
Ybco Bulk ◽  
Optimal Speed ◽  
Force Measurement System ◽  
Moving Speed

The effect of magnet moving speed on the relaxation of the maximum levitation force of YBCO bulk has been investigated. The experiment was carried out between a cylinder permanent magnet and a single-domain YBCO bulk, and the levitation force was measured using a self-made levitation force measurement system. It is found that the levitation force decreases with time after the gap distance between the magnet and YBCO bulk reduced to 2 mm and kept for the test. It is also found that the levitation force and its relaxation rate is different for different moving speed between the magnet and the YBCO bulk, and the higher the moving speed, the greater the relaxation rate of levitation force. However, the largest levitation force is obtained at an optimal speed, the higher the levitation force, and the faster the relaxation of levitation force.

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