Modelling and stability analysis of a repulsive type magnetic bearing

The paper aims in analysing the performance of a single axis-controlled repulsive type magnetic bearing system. The model of the system is designed using an industry level modelling software Ansys Maxwell. The model designed is a horizontal axis one and the philosophy behind the design principle is that of a passive magnetic bearing system. The model indicates two rotor bodies whose axis of rotation is the horizontal axis. Stator body in a discontinuous fashion surrounds the rotor body. The rotor and stator are both permanent magnets and the material chosen for their modelling purpose is NdFeB (Neodymium Magnets, an alloy containing the elements Neodymium, Iron, and Boron (Nd-Fe-B)). The simulated operational characteristics reveal that the system is unstable along the horizontal axis or the axis of rotation. To overcome the problem a simulation based PID control stability analysis is also been proposed with necessary justification.