水润滑轴承加载装置电磁力动态变化机理研究
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TH39

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国家自然科学基金资助项目(51605269);陕西省高校青年杰出人才支持计划资助项目(SLGQD1802)


Dynamic Variation Mechanism of Electromagnetic Force for Loading Device of Water⁃Lubricated Bearing
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    摘要:

    针对电磁加载装置电磁力在动态载荷模拟试验中的不稳定现象,为了给水力机械中的水润滑轴承性能研究提供准确载荷,电磁力动态变化机理需深入研究。首先,通过理论推导得到了电磁加载装置电磁力动态变化数学模型;其次,建立了电磁加载装置物理模型并进行有限元分析,获得了电磁力、磁阻力矩与磁通密度等参数的变化规律;最后,进行了电磁加载装置电磁力动态试验测试。理论、仿真与试验测试对比分析结果表明:电磁力动态变化与轴转速变化、轴偏心密切相关;轴转速升高,电磁铁表面涡流与集肤效应逐渐增强,加载盘表面磁阻增大,电磁力逐渐减小;轴偏心会引起轴与电磁铁间隙变化,从而导致电磁力变化;在0.5~1.5 A电磁铁电流激励下,轴无偏心与存在偏心时,电磁力仿真与试验结果的最大误差分别为6.8%,6.1%。

    Abstract:

    The electromagnetic force of electromagnetic loading device is unstable in dynamic load simulation test, in order to provide accurate load for performance study of water-lubricated bearings in hydraulic machinery including water pumps, water turbines, and so on, the dynamic change mechanism of electromagnetic force is studied. Firstly, the dynamic change mathematical model of electromagnetic force for loading device is deduced in theory. Secondly, the physical model of electromagnetic loading device is established, the finite element analysis is carried out, and the change rules of electromagnetic force, magnetic reluctance torque, magnetic flux density and other parameters are obtained. Finally, the dynamic test of electromagnetic force of loading device is conducted. The results of comparison and analysis among theory, simulation and test show that the dynamic changes of electromagnetic force are closely related to speed variation and eccentricity of shaft. With the increase of shaft speed, the eddy current and skin effect on surface of electromagnet are gradually enhanced, the magnetic resistance of loading plate surface increases, and the electromagnetic force decreases gradually. The shaft eccentricity results in the change of gap between shaft and magnet, and the electromagnetic force changes. Under the excitation of electromagnet current (0.5~1.5 A), when the shaft has no eccentricity or not, the maximum error of simulation and test results of electromagnetic force are separately 6.8%, 6.1%.

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  • 在线发布日期: 2022-05-06
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