Research On Bearingless Switched Reluctance Motors

Bearingless motors are developed to meet the need of high-speed and super high-speed driving systems. The theory of bearingless motors was verified on synchronous motors first, then asynchronous motors. In recent years, bearingless switched reluctance motors are developed, which not only will free rotate speed from mechanical bearings, but also will possibly achieve the goal of low vibration and low noise because of the control of radial position of the rotor.In this thesis, the overview of bearingless switched reluctance motor and the deduction procedure of the analytical model was presented, the control strategy based on determining advanced angle of square wave currents was discussed, and the relationship between radial force and torque generated by the motor was analyzed.Then the scheme of bearingless switched reluctance motor (both hardware part and software part) was introduced. The design of the motor itself and the digital control system based on TMS320LF2407A was presented, points of determining advanced angle of square wave currents were discussed. Finally, typical experiment waveforms were presented.