A study on vibration control of active magnetic rotor-isolator system under base excitation

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (12) : 152-163.

ZHANG Yibo，ZHOU Jin，SHEN Quan，ZHANG Yue，JIN Chaowu

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Abstract

Active Magnetic Bearing (AMB) has limited ability to suppress the base excitation. When the vibration of the rotor caused by the base excitation is greater than its suspension gap, the rubbing damage between the rotor and stator of the magnetic bearing system will occur, resulting in equipment damage. In view of the above problems, the base excitation vibration suppression method combining the isolator and the active controller of magnetic bearing is proposed. On the basis of establishing the magnetic bearing rotor model under the base excitation, further considering the mutual coupling effect of vibration isolator, base and magnetic suspension bearing stator, the coupling relationship of the three is transferred to the stiffness and damping matrix of the magnetic rotor system equation in the form of generalized force, and the electromechanical integration model of the magnetic suspension rotor-vibration isolator coupling system is established. According to the coupling model, the influence of vibration isolator design parameters on rotor amplitude under different harmonic excitations is analyzed. Based on the variation of rotor amplitude, the maximum deformation, maximum acceleration and rotor stator clearance of vibration isolator are taken as the design objectives, and the appropriate stiffness range of vibration isolator is derived. Combined with the coupling vibration suppression effect of isolator-high stiffness active controller, the vibration suppression effect of the coupling system on the base excitation is analyzed theoretically and experimentally. The results show that compared with the magnetic suspension rotor system without isolator, the maximum amplitude of the rotor can be reduced from 0.052 mm to 0.011 mm by using isolator-high stiffness controller coupling control, and the overall amplitude of the rotor is less than 10 % of the protection gap (0.125 mm).

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active magnetic bearing / rotor dynamics / base excitation / isolator / vibration control

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ZHANG Yibo，ZHOU Jin，SHEN Quan，ZHANG Yue，JIN Chaowu. A study on vibration control of active magnetic rotor-isolator system under base excitation[J]. Journal of Vibration and Shock, 2023, 42(12): 152-163

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