Stiffness Analysis Of The Magnetic Bearings System

The stiffness of the magnetic bearing system was studied on the basis of its non-linear mathematic model. How the controller will influence to the stiffness of the magnetic bearing system was studied first. One method was to change the parameter of the controller. In this way, the optimum parameter of the controller can be find out. The second method is to change the control algorithm. In this way, we select the PID controller and Fuzzy controller as the study objects. We discussed how these methods would influence to the stiffness of the system by simulation of computer. In order to enhance the stiffness of the system, the decoupling algorithm is studied in our control algorithm. Apart from these, the simulation experiment was made to illustrate the motion of the axis when the external disturbance was imposed on. To the same disturbance, the different control algorithm and different control parameters will deduce the different performance of stiffness and damping.