基于磁-流热固多场耦合的磁力联轴器应力形变分析

为探究不同转速下磁力联轴器部件的温升和应力形变情况,基于ANSYS Workbench耦合平台,首先对其进行单向的热磁耦合,并进行温度分布分析,再对磁场与流场共同作用下的磁力联轴器结构场进行热固单向耦合分析.结果表明:隔离套的高温区域在轴向上主要对应于磁钢所在位置,并且温度向套筒两端明显递减.隔离套的较大形变区域与高温区域一致,周向上呈向外膨胀状态,轴向上呈两端递减.对于内磁转子体,应力主要集中在薄金属包封套表面且向转子内部递减.对于外磁转子体,应力主要集中在磁钢周围与转子内表面,并由内向外呈现递减趋势.此外内外磁转子体的形变量并不大,但转速对联轴器部件的温升和应力形变影响较大.随转速增大,隔离套的温升、形变与应力值最大增长约7倍,内外磁转子体的应力峰值从6.35 MPa增大到37.30 MPa.

Stress and deformation analysis of magnetic coupling based on multi-field coupling of magnetic-fluid-thermal-solid

The multi-field coupling analysis of a magnetic coupling was numerically simulated to investigate the change rule of its temperature rise, stress and deformation at different rotating speeds based on the ANSYS Workbench coupling platform. Firstly, the unidirectional thermal magnetic coupling was carried out, and the temperature distribution was analyzed. Then the structure field of magnetic coupling under the combined action of magnetic field and flow field was analyzed by thermos setting unidirectional coupling. The results show that the high-temperature region of the isolation sleeve mainly corresponds to the location of magnetic steel in the axial direction, and the temperature decrease signi-ficantly to the both ends of the sleeve. The larger deformation area of the isolation sleeve is consistent with the high-temperature region, and it expands outward in the circumferential direction and decreases at both ends in the axial direction. For the internal magnetic rotor, the stress is mainly concentrated on the surface of the thin metal envelope and decreases toward the inside of the rotor. For the external magnetic rotor, the stress is mainly concentrated near the magnetic steel and the inner surface of the rotor, and the stress decreases from inside to outside. In addition, the deformation of internal and external magnetic rotor is smaller. The rotational speed has a significant influence on the temperature rise, and stress deformation of coupling components. With the increase of the rotating speed, the maximum temperature rise, stress and deformation value of the isolation sleeve increase by about 7 times, and the peak stress of the internal and external magnetic rotor increases from 6.35 MPa to 37.30 MPa.