Abstract
The thermal deformation of magnetic poles caused by the heat loss of the coils of Magnetic Liquid Double Suspension Bearing (MLDSB) can reduced the gap between magnetic poles and magnetic sleeve, and the probability and degree of impact-rub can be increased in the working process of MLDSB. And the coatings of magnetic poles and magnetic sleeve can be worn overly, and the operation stability and service life of MLDSB will be reduced severely. The thermal deformation of magnetic poles can be affected by the material property of magnetic pole, the electric current of the coils, and the cooling effect of the lubricants and so on, so it belongs to the multiple physical field coupling. Therefore, the flow-solid-thermal coupled mathematics model of MLDSB is established and solved with ANSYS in this paper, and the distribution law of flow field of the magnetic pole is explored. The transfer path and distribution principles of heat loss are revealed and the distribution law of temperature rise and thermal deformation of magnetic pole in different operating conditions are explored. The results indicate that the temperature rise and thermal deformation of the stator is symmetrically distributed in the center, it gradually increase from the outside to the center, and the thermal deformation near the corner of magnetic pole is largest. The most heat loss can be taken away by the lubricants under the condition of heat balance. The thermal deformation of magnetic pole can increase linearly as the current gradually increase, and the stress is concentrated in the threaded hole and magnetic pole. The thermal deformation decreases linearly as the inlet pressure of the lubricants gradually increase. The PIV results of flow trace are basically consistent with the simulation results. The research in this paper can provide the theoretical reference for the structural design and the optimization of MLDSB.
Nanofibrous membrane through multi-needle electrospinning with multi-physical field coupling
