Simulation And Optimization On Radial Active Magnetic Bearing

Radial active magnetic bearing (AMB) is a typical system in magnetic suspension field. The active magnetic bearing can support a rotor without contact by using electromagnetic force. With the advantage of unlubricated, little oil contaminated, long life-span and the adaptability of various environment, AMB is widely used. So the research on AMB is more and more further.It is reasonable to design the structure of active magnetic bearing properly for the improvement of its performance. Based on finite element analysis software COMSOL Multiphysics, the simulation of AMB is studied while the suspending force of AMB is calculated. First, we builded up a dynamic parameter model, so we can analyze the magnetic field distribution and magnetic force at an arbitrary size. Then we discussed some element which affect magnetic filed such as coil current, air gap, pole width and rotor bias under two working mode.Then the optimization process of AMB model is presented on the basis of optimization software iSIGHT together with COMSOL, during which the AMB model is called automatically by iSIGHT. We used sequential quadratic programming method and the result shows that the combination of COMSOL Multiphysics and iSIGHT software is a convenient and effective method for the simulation and optimization of AMB system.At last, we used PID controller to realize the close-loop control on single degree of freedom AMB system, and analyze the performance of PID controller with the simulation result on Simulink.Through the research above, we finish the design of the whole active magnetic bearing system. The research result provides a feasible method for the analysis and optimization of AMB system, which will be useful for the engineering application.