Study On Decoupling Control Of Bearingless Switched Reluctance Motors Based On Differential Geometry And Digital System’s Design

Bearingless switched reluctance motor(BSRM) is developed to meet the need of high—speed and super high—speed driving systems. According to the comparability between the windings of magnetic bearing and bearingless switched reluctance motor stator, the windings, which create suspending force and torque, are laminated together on the motor stator to create the steady suspending force and torque. And the motor can be realized suspending and rotating steadily by using some control strategy to adjust timely current in the motor windings. The bearingless switched reluctance motor demonstrates the potential applications in space technology, science research, high vacuum teclinology and ultra high—speed drives.In this paper,firstly,the structure、principle and the mathematic model of the BSRM were analyzied. Then, the radicial nonlinear and coupled system was converted to the affine nonlinear system, and the coordinate transform according to the theory of nonlinear differential geometry was performed for the new model ,in which the systems were decomposed to several linear subsystem.Consequently,the radcial model was decoupled dynamically. Furthermore, sliding model control theory had been applied to these subsystems to obtain the desired response.The simulation results showed that the proposed method was effective and the system had good robustness.In the end,converters used in the Bearingless Switched Reluctance Motor was designed in this thesis.moreover,assistant circuits (including the driving circuit,the safeguard circuit ,the snubber circuit)and the digital control system based on TMS320LF2406A and EPM7032S was designed to obtain a highly dynamic response.