Research Of Magnetic Suspending Switched Reluctance Motor

The magnetic suspending switched reluctance motor (SRM) combines the active magnetic bearing into a conventional SRM, so that the rotor shaft may suspend and rotate at the time. The magnetic suspending SRM no long as the advantages of simple structure, high speed like SRM, but also has the advantages of no abrasion, no friction like active magnetic bearing. It will be widely used in high speed motors, space flight and so on.The control theories are mentioned in the paper. The nonlinear model and zero-bias control model is established by analyzing the magnetic suspending SRM control model theoretically. The control methods are put forward based on feedback linearization method and PID control method. The parameters are also discussed according Routh criterion. Based on MATLAB/Simulink, the simulation model of the axial suspending and radial suspending was derived in order to prove the feasibility of the control methods. Considering the difference between the radial suspending and axial suspending, the current of axial winding is controlled by PI controller, and the current of axial winding is controlled by hysteresis Current Controller.A new controller is designed based on Sliding Mode Variable Structure Control and feedback linearization method. The existence condition of slide mode control was given. By simulation, the validity of controller for magnetic suspending switching reluctance motor is tested.The digital control system is designed on the basis of the double-DSP, and the model machine is 5 kilowatt. The experiment results verify that the rotor shaft may be successfully suspended and rotated. The rotor shaft may be suspended under loaded condition in axial direction.