Magnetic flux leakage modelling and optimisation of a CRAHMB for DC motor

In this study, a combined radial–axial hybrid magnetic bearing (CRAHMB) with four poles is designed for high-speed brushless DC motor. Owing to the small distance of radial and axial unit of CRAHMB, the magnetic flux leakage (MFL) in both radial and axial directions is complex and serious. This stud...

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Vydané v:IET electric power applications Ročník 11; číslo 2; s. 212 - 221
Hlavní autori: Ren, Xiaojun, Le, Yun, Sun, Jinji, Han, Bangcheng, Wang, Kun
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: The Institution of Engineering and Technology 01.02.2017
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ISSN:1751-8660, 1751-8679, 1751-8679
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Abstract In this study, a combined radial–axial hybrid magnetic bearing (CRAHMB) with four poles is designed for high-speed brushless DC motor. Owing to the small distance of radial and axial unit of CRAHMB, the magnetic flux leakage (MFL) in both radial and axial directions is complex and serious. This study focuses on effective analytical model and optimisation of CRAHMB including flux leakage of permanent magnet circuit and control electromagnetic circuit. MFL analytical model was built based on equivalent magnetic circuit method. Under the condition of satisfying the maximum bearing capacity, the MFL coefficients were optimised with sequence quadratic programming method. A set of optimum parameters were suggested. MFL before and after optimisation are compared by finite element method. Finally, current stiffness calculated with optimised analytical model was verified on a DC motor experiment. The result shows the accuracies of both the axial and radial current stiffness are enhanced.
AbstractList In this study, a combined radial–axial hybrid magnetic bearing (CRAHMB) with four poles is designed for high‐speed brushless DC motor. Owing to the small distance of radial and axial unit of CRAHMB, the magnetic flux leakage (MFL) in both radial and axial directions is complex and serious. This study focuses on effective analytical model and optimisation of CRAHMB including flux leakage of permanent magnet circuit and control electromagnetic circuit. MFL analytical model was built based on equivalent magnetic circuit method. Under the condition of satisfying the maximum bearing capacity, the MFL coefficients were optimised with sequence quadratic programming method. A set of optimum parameters were suggested. MFL before and after optimisation are compared by finite element method. Finally, current stiffness calculated with optimised analytical model was verified on a DC motor experiment. The result shows the accuracies of both the axial and radial current stiffness are enhanced.
Author Ren, Xiaojun
Le, Yun
Han, Bangcheng
Wang, Kun
Sun, Jinji
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  organization: 3Beijing Engineering Research Center of High-Speed Magnetically Suspended Motor Technology and Application, Beijing University of Aeronautics and Astronautics, Beijing 100191, People's Republic of China
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Issue 2
Keywords magnetic flux
permanent magnet circuit
sequential quadratic programming method
magnetic bearings
high speed brushless DC motor
equivalent circuits
finite element analysis
quadratic programming
permanent magnets
control electromagnetic circuit
maximum bearing capacity
magnetic circuits
optimisation
MFL analytical model
finite element method
magnetic flux leakage modelling
equivalent magnetic circuit method
CRAHMB
magnetic leakage
brushless DC motors
combined radial-axial hybrid magnetic bearing
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Snippet In this study, a combined radial–axial hybrid magnetic bearing (CRAHMB) with four poles is designed for high-speed brushless DC motor. Owing to the small...
In this study, a combined radial–axial hybrid magnetic bearing (CRAHMB) with four poles is designed for high‐speed brushless DC motor. Owing to the small...
In this study, a combined radial-axial hybrid magnetic bearing (CRAHMB) with four poles is designed for high-speed brushless DC motor. Owing to the small...
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SubjectTerms brushless DC motors
Circuits
combined radial‐axial hybrid magnetic bearing
control electromagnetic circuit
CRAHMB
Direct current
Electric motors
equivalent circuits
equivalent magnetic circuit method
finite element analysis
finite element method
high speed brushless DC motor
Leakage
magnetic bearings
magnetic circuits
Magnetic flux
magnetic flux leakage modelling
magnetic leakage
Mathematical models
maximum bearing capacity
MFL analytical model
optimisation
Optimization
permanent magnet circuit
permanent magnets
quadratic programming
sequential quadratic programming method
Stiffness
Title Magnetic flux leakage modelling and optimisation of a CRAHMB for DC motor
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https://www.proquest.com/docview/1893904695
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