Design Optimization and Experimental Verification of an Axial Magnetic Bearing
| Autor: | Jing-Siang Jhang, 張景翔 |
|---|---|
| Rok vydání: | 2010 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 98 The rotor suspension system generally utilizes radial and axial magnetic force for making rotor to suspend in the air gap. The structure of the conventional axial magnetic force bearing consists of an upper electromagnet, a lower electromagnet, and a rotor disk that clamped between the upper electromagnet and the lower electromagnet. It should control two groups of coil current individually to maintain the rotor in the position of the central working point, because the electromagnets only can generate attraction. The rotor disk of the magnetic force bearing is so lager that fabrication of the magnetic force bearing is more difficult. In addition, while the rotor slopes slightly, the rotor hits the stator easily. A novel magnetic bearing design proposed in the paper, wherein the structure of the stator includes stator coil and permanent magnet, and the rotor consists of a shaft and a permeability disk. The magnetic bearing is only controlled by single group of coil. When adding the positive current in the stator coil, the rotor moves in positive direction. On the other hand, when adding the negative current in the stator coil, the rotor moves in negative direction. Since the rotor disk is smaller, the rotor disk can not hit the stator in operating, and the volume of the magnetic bearing in the paper is smaller than the volume of conventional magnetic bearing. The Finite Element Analysis and Taugchi Method utilized to design magnetic bearing in the paper, under the condition that the out diameter and the length are both constant, the optimal design makes the bearing to generate the lowest axial force 20 N in the rated current and achieve the best efficiency. Besides theory Analysis design, it established an axial measure mechanical for verifying the performance of the axial magnetic bearing performance of this design. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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