Modeling and control of an unbalanced magnetic rotor-bearing system as a bearingless motor

Abstract

Purpose This paper is concerned with the design and analysis of a bearingless motor. Design/methodology/approach The bearingless motor is obtained by a regular three-pole active magnetic bearing with an intentionally attached unbalanced mass on the rotor. It is the unbalanced mass that will generate the rotational torque for the motor function. Modeling and control of the unbalanced mass-type bearingless motor have been considered. Findings It is found through simulations that both functions of motor and magnetic bearing can indeed be achieved in this system. Originality/value This novel bearingless motor requires no additional windings and permanent magnets. Thus, it can greatly reduce the cost and design of the bearingless motor.