Vibration Suppression by Seeking Unbalance Mass-radius Product in Active Magnetic Bearing-rotor System with Varying Speed Condition

doi:10.3901/JME.2018.21.072

Abstract

Abstract: The undesired synchronous vibration due to rotor mass imbalance is a main disturbance source in all rotating machinery. In this research, a novel unbalance compensation method is proposed for the active magnetic bearings-rigid rotor system. It can force the rotor to spin around its geometric axis for the better rotary precision by means of producing the control signal according to seeking the unbalance mass-radius product of the rotor, which is suitable especially for the varying speed condition. The control methods based on the unbalance force must continually update its control to track the varying unbalance force due to the varying speed. In contrast, the unbalance mass-radius product is the inherent property of the rotor and independent of the rotor speed. The method based on the mass-radius product updates its control only for overcoming the system nonlinearity. Additionally, the seeking step size in the proposed method is variable to reconcile the contradiction between the seeking efficiency and the control precision. The experiments indicate that the proposed method achieves the good effectiveness to suppress the rotor vibration. It has the lower computational cost and suitable for the condition of crossing the critical speed and fast varying-speed.

Key words: active magnetic bearing, rigid rotor, unbalance control, varying speed

CLC Number:

TH133

JIANG Kejian, WANG Jun, ZHU Changsheng. Vibration Suppression by Seeking Unbalance Mass-radius Product in Active Magnetic Bearing-rotor System with Varying Speed Condition[J]. Journal of Mechanical Engineering, 2018, 54(21): 72-80.

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