Electromagnetic bearing actuator for active vibration control of a flexible rotor

This paper presents a detailed description of the electromagnetic actuator for active vibration control of a flexible rotor bearing system. The transf er characteristics of the electromagnetic actuator are investigated theoret ically and experimentally. The linearized relationship of the electromagnet ic force/input control voltage can be achieved by employing the analogue sq uare root control circuits. A control algorithm which allows the control fo rce of the actuator to be computed to minimize the synchronous rotor vibrat ion is discussed. Computer simulation on a simple rotor bearing system is p resented to demonstrate the effectiveness of the control algorithm in synch ronous vibration reduction using the electromagnetic actuator.