基于在线识别对转速不敏感的主动电磁轴承转子系统不平衡振动控制

On-line Identification Based Unbalance Vibration Control With Less Regard to Rotor Speed in Active Magnetic Bearings Supporting Rotor System

提出一种基于振动识别的主动电磁轴承转子系统不平衡补偿控制方法。该方法的最大特点是能够不依赖控制对象的传递函数,在线识别出转子等效不平衡质量的大小和位置,然后根据识别结果计算出精确的控制信号,迫使转子绕其几何轴旋转。当转子转速变化时,尽管不平衡力随之变化,但不平衡质量的大小和相位特性不会改变,因此无需重新识别不平衡量,大大提高了在变转速情况下对转子不平衡的控制性能,同时减轻了控制器的计算负担。对算法的控制效果进行了实验测试,结果表明提出的对转速不敏感的基于振动识别的主动电磁轴承转子系统不平衡补偿控制方法对不平衡振动的抑制取得了很好的效果,并在转速变化情况下能大幅减少重新识别不平衡量的次数。

A novel unbalance compensation method based on vibration identification was proposed with less regard to the rotor rotating speed in active magnetic bearings （AMB）. Its unique features were that the magnitude and the phase of equivalent unbalance mass could be identified in real time with no need for the transfer function of plant model,and the accurate compensation signal could be generated to spin the rotor about its geometric center. While the rotor speed varies,there was no need for identification update because the characteristic of unbalance mass was not changed,in spite of the unbalance force variation correspondingly. Hence,the unbalance control performance could be improved dramatically and meanwhile the calculating task would be decreased. The experiments show that the proposed unbalance compensation method achieves the good effectiveness for restraining unbalance vibration and sharply decrease the times of identification renewing during rotor speed variation.