| LIU Hongmei (刘洪美)*,YANG Guang**,SUN Yanan**,SUN Jian**,WANG Zhe***,ZHAO Jianhua***.[J].高技术通讯(英文),2024,30(3):322~332 |
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| Analysis of rotor eddy current loss and thermal deformation of magnetic liquid double suspension bearing |
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| DOI：10. 3772 / j. issn. 1006-6748. 2024. 03. 012 |
| 中文关键词: |
| 英文关键词: magnetic-liquid double suspension bearing (MLDSB), oil film thickness, current loss, thermal deformation, particle image velocimetry (PIV) test |
| 基金项目: |
| Author Name | Affiliation | | LIU Hongmei (刘洪美)* | ( * Shijiazhuang Rail Transit Group Co. Ltd, Shijiazhuang 050011, P. R. China)
( ** Shijiazhuang Haishan Industrial Development Co. Ltd, Shijiazhuang 050200, P. R. China)
( *** Fluid Power Transmission and Control Laboratory, Yanshan University, Qinhuangdao 066004, P. R. China) | | YANG Guang** | | | SUN Yanan** | | | SUN Jian** | | | WANG Zhe*** | | | ZHAO Jianhua*** | |
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| 中文摘要: |
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| 英文摘要: |
| Magnetic-liquid double suspension bearing ( MLDSB) is a new type of suspension bearing
based on electromagnetic suspension and supplemented by hydrostatic supporting. Without affecting
the electromagnetic suspension force, the hydrostatic supporting effect is increased, and the real-
time coupling of magnetic and liquid supporting can be realized. However, due to the high rotation
speed, the rotor part produces eddy current loss, resulting in a large temperature rise and large ther-
mal deformation, which makes the oil film thickness deviate from the initial design. The support and
bearing characteristics are seriously affected . Therefore, this paper intends to explore the internal
effects of eddy current loss of the rotor on the temperature rise and thermal deformation of MLDSB.
Firstly, the 2D magnetic flow coupling mathematical model of MLDSB is established, and the eddy
current loss distribution characteristics of the rotor are numerically simulated by Maxwell software.
Secondly, the internal influence of mapping relationship of structural operating parameters such as
input current, coil turns and rotor speed on rotor eddy current loss is revealed, and the changing
trend of rotor eddy current loss under different design parameters is explored. Thirdly, the eddy cur-
rent loss is loaded into the heat transfer finite element calculation model as a heat source, and the
temperature rise of the rotor and its thermal deformation are simulated and analyzed, and the influ-
ence of eddy current loss on rotor temperature rise and thermal deformation is revealed. Finally, the
pressure-flow curve and the distribution law of the internal flow field are tested by the particle image
velocimetry (PIV) system. The results show that eddy current loss increases linearly with the in-
crease of coil current, coil turns and rotor speed. The effect of rotational speed on eddy current loss
is much higher than that of coil current and coil turns. The maximum temperature rise, minimum
temperature rise and maximum thermal deformation of the rotor increase with the increase of eddy
current loss. The test results of flow-pressure and internal trace curves are basically consistent with
the theoretical simulation, which effectively verifies the correctness of the theoretical simulation. The
research results can provide theoretical basis for the design and safe and stable operation of magnetic
fluid double suspension bearings. |
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