磁轴承过临界同步阻尼技术研究

doi:10.19799/j.cnki.2095-4239.2021.0258

摘要/Abstract

摘要：

目前磁轴承向更高速更可靠的方向发展，转子转速不得不超过弯曲临界转速，而在临界频率附近由于阻尼不足，磁轴承系统面临着失稳风险。针对磁轴承转子越过一阶临界转速存在的问题，为帮助转子达到更高的稳定转速，提出同步阻尼法为转子提供越临界所需阻尼，并分别利用有限元分析和模态分析建立转子模型，对同步阻尼法的可靠性进行了详细的分析验证，为同步阻尼法的实际应用打下基础。在磁轴承设备上实验表明，同步阻尼法成功帮助转子平稳越过了45000 r/min的一阶弯曲转速，进一步验证了同步阻尼法帮助挠性转子过临界的有效性。

关键词: 磁轴承, 不平衡控制, 挠性转子, 临界转速, 同步阻尼

Abstract:

Recently, magnetic bearing systems have undergone development to induce higher speed and better reliability in such systems. This has led to the rotor speed exceeding the first-order bending critical speed. However, due to insufficient damping at a critical frequency, magnetic bearing systems face instability risks. In order to adapt the system's performance and stability around the first-order critical speed, this paper proposes a synchronous damping method to provide the damping required for the rotor to cross the critical speed and to support it in reaching a higher yet stable speed. With a rotor modal constructed using the classic finite element method and combining the modal separation method and mass discretization, the suppression of unbalanced vibration around the first-order critical speed using the synchronous damping method was verified in detail. This result can serve as a foundation for the practical application of the synchronous damping method. Finally, with the addition of the synchronous damping module in the existing magnetic bearing equipment in a laboratory setting, the rotor steadily transited the first-order bending speed of 45,000 r/min, which verified the effectiveness of the synchronous damping method in supporting the flexible rotor to pass through the critical speed.

Key words: magnetic bearing, unbalance control, flexible rotor, critical speed, synchronous damping

中图分类号:

TH 133

刘亚婷, 张剀, 徐旸. 磁轴承过临界同步阻尼技术研究[J]. 储能科学与技术, 2021, 10(5): 1656-1666.

Yating LIU, Kai ZHANG, Yang XU. Research on synchronous damping around the critical bending speed of magnetic bearings[J]. Energy Storage Science and Technology, 2021, 10(5): 1656-1666.

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参数	数值
转子总质量m/kg	3.5
转子总长度l/mm	440
临界转速/(r·min^-1)	45000
径向电磁气隙/mm	0.3
径向保护气隙/mm	0.1

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