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| Axial magnetic force analytical model for radial magnetization multi-annular nesting permanent magnetic bearings |
| Received:May 21, 2008 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx20102034 |
| KeyWord:radial magnetization magnetic annulus PMB analytical model axial magnetic force |
| Author | Institution |
| 田录林 |
西安理工大学 水电学院,西安 |
| 李言 |
西安理工大学 机仪学院,西安 |
| 田琦 |
西北大学 数学系,西安 |
| 李知航 |
西安电子科技大学 通讯工程学院,西安 |
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| Abstract: |
| To overcome small magnetic force for radial magnetization bi-annular PMB (permanent magnetic bearings), the new construction of radial magnetization multi-annular nesting PMB was designed. Based on magnetic circuit and the differential coefficients of magnetic field energy to virtual displacement method, connected with the structure character of multi-annular nesting PMB and linearity addition principle, the axial magnetic force analytical model of radial magnetization multi-annular nesting PMB was constructed. The model shows that the axial magnetic force of radial magnetization multi-annular nesting PMB is proportional to the second power of residual magnetism induction density, and that the magnetic force decreases with an increase in magnetic annular radial gaps and increases with an increment in the number of magnetic annulus. It also shows that the magnetic force increases with the increment of axial excursion in normal range. The calculated values of the model are basically in agreement with those of finite element method. Compared calculation shows that axial magnetic force of radial magnetization multi-annular nesting PMB is bigger than the sum of magnetic force of bi-annular PMB which be made by the magnetic annulus of multi-annular nesting PMB. |
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