Unbalanced Magnetic Pull Effect on Stiffness Models of Active Magnetic Bearing due to Rotor Eccentricity in Brushless DC Motor Using Finite Element Method
We firstly report on an investigation into the unbalanced magnetic pull (UMP) effect on the static stiffness models of radial active magnetic bearing (RAMB) in brushless DC motor (BDCM) in no-loaded and loaded conditions using the finite element method (FEM). The influences of the UMP on the force-...
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2013-01-01
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Series: | Mathematical Problems in Engineering |
Online Access: | http://dx.doi.org/10.1155/2013/745912 |
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doaj-3c4025a3967f49a693f07ac35c3d15712020-11-24T23:17:52ZengHindawi LimitedMathematical Problems in Engineering1024-123X1563-51472013-01-01201310.1155/2013/745912745912Unbalanced Magnetic Pull Effect on Stiffness Models of Active Magnetic Bearing due to Rotor Eccentricity in Brushless DC Motor Using Finite Element MethodBangcheng Han0Shiqiang Zheng1Xiquan Liu2School of Instrument Science and Optoelectronics Engineering, Beihang University, Beijing 100191, ChinaSchool of Instrument Science and Optoelectronics Engineering, Beihang University, Beijing 100191, ChinaSchool of Instrument Science and Optoelectronics Engineering, Beihang University, Beijing 100191, ChinaWe firstly report on an investigation into the unbalanced magnetic pull (UMP) effect on the static stiffness models of radial active magnetic bearing (RAMB) in brushless DC motor (BDCM) in no-loaded and loaded conditions using the finite element method (FEM). The influences of the UMP on the force-control current, force-position, current stiffness, and position stiffness of RAMB are clarified in BDCM with 100 kW rated power. We found the position stiffness to be more susceptible to UMP. The primary source of UMP is the permanent magnets of BDCM. In addition, the performance of RAMB is affected by the UMP ripples during motor commutation and also periodically affected by the angular position of rotor. The characteristic curves of RAMB force versus control current (or rotor position) and angular position of rotor affected by the UMP are given. The method is useful in design and optimization of RAMB in magnetically suspended BDCMs.http://dx.doi.org/10.1155/2013/745912 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Bangcheng Han Shiqiang Zheng Xiquan Liu |
spellingShingle |
Bangcheng Han Shiqiang Zheng Xiquan Liu Unbalanced Magnetic Pull Effect on Stiffness Models of Active Magnetic Bearing due to Rotor Eccentricity in Brushless DC Motor Using Finite Element Method Mathematical Problems in Engineering |
author_facet |
Bangcheng Han Shiqiang Zheng Xiquan Liu |
author_sort |
Bangcheng Han |
title |
Unbalanced Magnetic Pull Effect on Stiffness Models of Active Magnetic Bearing due to Rotor Eccentricity in Brushless DC Motor Using Finite Element Method |
title_short |
Unbalanced Magnetic Pull Effect on Stiffness Models of Active Magnetic Bearing due to Rotor Eccentricity in Brushless DC Motor Using Finite Element Method |
title_full |
Unbalanced Magnetic Pull Effect on Stiffness Models of Active Magnetic Bearing due to Rotor Eccentricity in Brushless DC Motor Using Finite Element Method |
title_fullStr |
Unbalanced Magnetic Pull Effect on Stiffness Models of Active Magnetic Bearing due to Rotor Eccentricity in Brushless DC Motor Using Finite Element Method |
title_full_unstemmed |
Unbalanced Magnetic Pull Effect on Stiffness Models of Active Magnetic Bearing due to Rotor Eccentricity in Brushless DC Motor Using Finite Element Method |
title_sort |
unbalanced magnetic pull effect on stiffness models of active magnetic bearing due to rotor eccentricity in brushless dc motor using finite element method |
publisher |
Hindawi Limited |
series |
Mathematical Problems in Engineering |
issn |
1024-123X 1563-5147 |
publishDate |
2013-01-01 |
description |
We firstly report on an investigation into the unbalanced magnetic pull (UMP) effect on the static stiffness models of radial active magnetic bearing (RAMB) in brushless DC motor (BDCM) in no-loaded and loaded conditions using the finite element method (FEM). The influences of the UMP on the force-control current, force-position, current stiffness, and position stiffness of RAMB are clarified in BDCM with 100 kW rated power. We found the position stiffness to be more susceptible to UMP. The primary source of UMP is the permanent magnets of BDCM. In addition, the performance of RAMB is affected by the UMP ripples during motor commutation and also periodically affected by the angular position of rotor. The characteristic curves of RAMB force versus control current (or rotor position) and angular position of rotor affected by the UMP are given. The method is useful in design and optimization of RAMB in magnetically suspended BDCMs. |
url |
http://dx.doi.org/10.1155/2013/745912 |
work_keys_str_mv |
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