Vibration reduction in a hollow-shaft rotor using flexibly-mounted internal-stator magnetic bearings

Abstract

A topology composed of a hollow-shaft rotor on rolling element bearings coupled with internal-stator magnetic bearings mounted on independently supported flexible shafts is considered for the purposes of vibration reduction. Details of a bespoke test rig constructed to assess this topology are presented. The rig makes use of customdesigned internal-stator magnetic bearings fabricated from Soft Magnetic Composite material. Results from standard numerical analysis of the rig are given to demonstrate the expected behaviour of the system, with a particular focus on its potential to reduce synchronous vibration seen in the rotor while passing critical speeds. These behaviours are then confirmed via a series of experimental tests. These results show that the proposed topology can be used effectively to alter the system vibration behaviour.

Active Vibration Control of a Flexible Rotor by Flexibly Mounted Internal-Stator Magnetic Actuators

“…The authors have presented [31] initial conceptual modeling of an arbitrary system based on this concept, demonstrating the potential capacity of the flexibly-mounted, internalstator magnetic actuator to influence a rotor system's dynamic characteristics. In [32], they present an experimental facility to explore the practical implementation of such a scheme. Some limited initial testing on the experimental facility using classical control techniques is presented, however only minor performance improvements are achieved via the AMBs when compared to the basic uncontrolled rotor.…”