Analysis of magnetic forces and rotational losses of high-Tc superconducting magnetic bearings by Preisach's diagram

2001 ◽  
Vol 11 (1) ◽  
pp. 1673-1676 ◽  
Author(s):  
S. Yokoyama ◽  
S. Nakamura ◽  
M. Hirose ◽  
H. Nasu
Keyword(s):  
Magnetic Bearings ◽  
High Tc ◽  
Magnetic Forces

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

Fundamental study on high Tc superconducting magnetic bearings for flywheel system

1995 ◽  
Vol 5 (2) ◽  
pp. 643-649 ◽  
Author(s):  
S. Nagaya ◽  
N. Hirano ◽  
M. Takenaka ◽  
M. Minami ◽  
H. Kawashima
Keyword(s):  
Magnetic Bearings ◽  
Fundamental Study ◽  
High Tc

Hybrid high Tc superconducting magnetic bearings for flywheel energy storage system

1994 ◽  
Vol 2 (7-8) ◽  
pp. 457-464 ◽  
Author(s):  
p.p. Chen ◽  
p. Xia ◽  
K.B. Ma ◽  
C.K. McMichael ◽  
M. Lamb ◽  
...  
Keyword(s):  
Energy Storage ◽  
Storage System ◽  
Energy Storage System ◽  
Magnetic Bearings ◽  
Flywheel Energy Storage ◽  
High Tc ◽  
Flywheel Energy Storage System

scholarly journals A Theoretical Investigation of Hybrid Foil-Magnetic Bearings on Operation Mode and Load Sharing Strategy

2020 ◽  
Author(s):  
Kai Feng ◽  
Hang Zhang ◽  
Qianwei Yin ◽  
Hanqing Guan ◽  
Yuanlong Cao
Keyword(s):  
Theoretical Investigation ◽  
Dynamic Performance ◽  
Operation Mode ◽  
Operating Mode ◽  
Load Sharing ◽  
Magnetic Bearings ◽  
Magnetic Forces ◽  
Sharing Strategy ◽  
Representative Work ◽  
Bearing Behavior

Abstract To guide the conceptual design of hybrid foil-magnetic bearings (HFMBs), this paper presents a theoretical investigation on operation mode and load sharing strategy. According to the inherent characteristics of GFBs and AMBs, seven possible work scopes are discussed to understand the operation mode of HFMBs. A numerical model coupling the calculations of the film pressure in GFBs and the magnetic forces in AMBs is conducted to predict the performance of HFMBs. The deflection of top foil and bumps is also included in the prediction model. The analysis, which is conducted for static and dynamic performance of HFMBs within three representative work scopes by varying the load sharing, uncovers the effects of the operation mode and load sharing strategy on bearing behavior. Results show that HFMBs performance including the supporting stiffness and stability can be obviously enhanced by adjusting the operating mode and load sharing strategy.

Experimental Contribution to High-Precision Characterization of Magnetic Forces in Active Magnetic Bearings

2006 ◽  
Vol 129 (2) ◽  
pp. 503-510 ◽  
Author(s):  
Klaus Kjølhede ◽  
Ilmar F. Santos
Keyword(s):  
Magnetic Flux ◽  
Model Validation ◽  
High Precision ◽  
Experimental Tests ◽  
Magnetic Bearings ◽  
Active Magnetic Bearings ◽  
Accurate Identification ◽  
Flexible Beams ◽  
Magnetic Forces

Parameter identification procedures and model validation are major steps toward intelligent machines supported by active magnetic bearings (AMB). The ability of measuring the electromagnetic bearing forces, or deriving them from measuring the magnetic flux, strongly contributes to the model validation and leads to novel approaches in identifying crucial rotor parameters. This is the main focus of this paper, where an intelligent AMB is being developed with the aim of aiding the accurate identification of damping and stiffness coefficients of active lubricated journal bearings. The main contribution of the work is the characterization of magnetic forces by using two different experimental approaches. Such approaches are investigated and described in detail. A special test rig is designed where the four pole AMB is able to generate forces up to 1900N. The high-precision characterization of the magnetic forces is conducted using different experimental tests: (i) by using hall sensors mounted directly on the poles (precise measurements of the magnetic flux) and by an auxiliary system, composed of strain gages and flexible beams attached to the rotor, (ii) by measuring the input current and bearing gap variations, monitoring the bearing input signals. Advantages and drawbacks of the different methodologies are critically discussed. The linearity ranges are experimentally determined and the characterization of magnetic forces with a high accuracy of <1% is achieved (percent error is normalized with respect to the instantaneous measured force obtained from the strain gauges signals).

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