Power Generation Operation Control Strategy For 12/8 Pole Single-Winding Bearingless Switched Reluctance Motor With Wider Rotor Teeth

Single-winding bearingless switched reluctance motor with wider rotor teeth(BSRMWR)not only has the advantages of simple structure,flexible control,high-speed operation,high fault tolerance,but also it is put forward,which could remove the coupling of torque and levitation force,its research is significant.At present,most researches focus on the single-winding BSRMWR electric operation mode,since the motor can realize both rotation and suspension functions,it has better application conditions in high-speed power generation fields such as distributed power generation systems,all-electric / multi-electric ships,and aircraft,therefore its power generation operation mode also needs more attention.This paper studies the power generation operation strategy of 12 / 8 pole single-winding BSRMWR,proposes two control strategies to meet the needs of the motor in different power generation occasions,then also achieves better control performance of output voltage through fuzzy PI control.The control strategies are put forward in the paper to provide theoretical basis for future experimental research.First,this paper compares the structures and working principle of single-winding bearingless switched reluctance motor(BSRM)and single-winding BSRMWR by finite element analysis software and explains the decoupling mechanism of torque and levitation force in the single-winding BSRMWR.The mathematical models of motor torque and levitation force are both derived by Maxwell stress method.Then the mathematical model of levitation force is improved by introducing intermediate variables.Second,less copper losses power generation operation control strategy is proposed,the calculation formula of motor control parameters and a block diagram for this control strategy are developed for their implementation.The simulation model is created in the Matlab/Simulink for this strategy with open-loop and closed-loop simulations on the system and studies the levitation force,output voltage and vibration response,it is verified that the motor can stably float and the output voltage is stable under this strategy.Third,the power generation operation control strategy for vibration reduction is proposed,deduce the motor control parameters,the open-loop and closed-loop simulation of the model are build in the Matlab/Simulink.This paper sets up the simulation models for this control strategy and less copper losses control strategy respectively and studies the vibration responses of stator teeth to the radial attractive force,it is verified that the vibration reduction effect of this strategy is significant.Finally,fuzzy control is introduced into the 12/8 pole single-winding BSRMWR power generation system,based on the characteristics of the motor,the fuzzy PI controller is designed in detail.The simulation model is set up in the Matlab/Simulink,the output voltage waveform of the system based on traditional PI control and the output voltage waveform based on Fuzzy PI control are compared and analyzed under the control strategies of vibration reduction and low copper losses power generation respectively,simulation results show that the control strategy under the fuzzy PI control has better control performance.