力自由不平衡控制下的高速磁悬浮飞轮系统在线动平衡

发布时间：2018-10-24 19:25

【摘要】：针对高速磁悬浮飞轮转子的不平衡问题,提出了一种在力自由不平衡控制下的在线动平衡方法,用空气环境下低转速的在线动平衡替代真空环境下的高转速在线动平衡,以实现兼顾高效率和高精度的在线动平衡。通过分析磁悬浮转子系统的不平衡模型和比较各不平衡控制模式下校正质量的求解方法,得出在力自由控制模式下,磁轴承的同频控制电流为零,电磁力在线性化范围内仅是转子位移的线性函数。因此根据转子的同频位移响应可解算动平衡校正质量。通过所设计的磁轴承力自由不平衡控制器使转子绕其惯性主轴旋转,获得了转子同频位移响应。由于系统参数的理论值与实际值存在一定误差,通过一次试重对转换系数矩阵进行了校正。实验结果表明,通过一次试重校正转换系数矩阵,再经过两次试转后即可实现高精度动平衡。另外,转子轴心轨迹显著减小、转子两端同频位移响应分别下降了77.29%和94.14%;在真空环境下,试验转子升速至500Hz时,转子的运行状况与低速状态一致,进一步验证了本文提出方法的有效性。
[Abstract]:In order to solve the unbalance problem of high-speed maglev flywheel rotor, an on-line dynamic balancing method under the control of force free unbalance is proposed. The on-line dynamic balance of high speed in vacuum environment is replaced by the on-line dynamic balance of low rotational speed in air environment. In order to achieve high-efficiency and high-precision online dynamic balance. By analyzing the unbalance model of the magnetic levitation rotor system and comparing the solution methods of the correction mass in each unbalance control mode, it is concluded that in the force free control mode, the cofrequency control current of the magnetic bearing is zero. The electromagnetic force is only a linear function of rotor displacement in the linearization range. Therefore, the dynamic balance correction quality can be calculated according to the same frequency displacement response of the rotor. The rotor is rotated around its inertial spindle by the designed magnetic bearing force free unbalance controller, and the displacement response of the rotor with the same frequency is obtained. Because there is a certain error between the theoretical value and the actual value of the system parameters, the conversion coefficient matrix is corrected by a test weight. The experimental results show that the high precision dynamic balance can be realized by correcting the conversion coefficient matrix with one trial and then two attempts. In addition, the axis trajectory of the rotor decreases significantly, and the displacement response of the two ends of the rotor decreases by 77.29% and 94.14%, respectively. In vacuum environment, the rotor running condition is consistent with the low-speed state when the rotor speed rises to 500Hz. The effectiveness of the proposed method is further verified.
【作者单位】：清华大学核能与新能源技术研究院;先进核能技术协同创新中心;先进反应堆工程与安全教育部重点实验室;清华大学工程物理系;
【基金】：国家科技重大专项(No.ZX069)
【分类号】：TH133.7

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