Research On New Maglev Switched Reluctance Energy Storage Motor And Its Operation Control

With the improvement of my country’s energy consumption level and the intensification of environmental protection issues,the society has begun to pay more attention to new energy and energy-saving technologies.Energy storage technology can reduce energy waste and improve system efficiency,which is of great significance for building a new and green energy system,and has attracted many scholars at home and abroad to participate in the research.Flywheel energy storage is an efficient physical energy storage technology,which has the advantages of high energy density,large instantaneous power,green and environmental protection,and is suitable for many fields such as power systems,aerospace,and new energy vehicles.The flywheel battery described in this paper recovers and stores the energy of the electric vehicle during braking in the flywheel,so as to avoid the problem of insufficient power when the vehicle starts or accelerates.The motor is the most important component of the flywheel battery,and the improvement and research on its structure optimization and control method will directly affect the research and development progress of the flywheel battery.The bearingless switched reluctance energy storage motor(BSRESM)combines the magnetic bearing and the switched reluctance energy storage motor technology,and effectively improves the criticality of the motor on the basis of retaining the magnetic bearing without friction and mechanical wear.speed,and realize electromagnetic torque and two-degree-of-freedom suspension control at the same time.In this paper,a new type of magnetic levitation switched reluctance energy storage motor is studied.BSRESM adopts dual 8/4 unit structure,analyzes the structure,operating principle and mathematical model of the motor,and models the motor body through Ansys/Maxwell software to verify the rationality of the motor structure.On this basis,according to the structural characteristics of the dual 8/4 BSRESM,the control strategy of its torque system and suspension system is analyzed and verified,and the power tracking control in the energy recovery process of the vehicle flywheel battery is designed by using the dual 8/4 BSRESM system.First,analyze the structure and operating principle of the double 8/4 maglev switched reluctance motor,design the size of the motor,and use Maxwell software to establish the motor body model,and conduct electromagnetic analysis on the torque,levitation force and decoupling performance of the motor.Characteristic analysis.According to the structure of the motor,the mathematical model of the torque and levitation force of the motor is deduced by using the virtual displacement method.According to the analysis of the mathematical model,there is a coupling relationship between the torque of the motor and the levitation current.Second,the torque and suspension system control of dual 8/4 maglev switched reluctance energy storage motors are modeled.According to the characteristics of time-division multiplexing of dual 8/4 maglev switch reluctance energy storage motors,the torque control system and suspension control system are designed separately.The angle-optimized chopping current control(CCC)and the direct instantaneous torque control(DITC)are used respectively for the torque system,and the control effects of the two methods are analyzed and compared.The suspension control system is divided into a continuous conduction interval and a commutation interval.In the continuous conduction interval of the motor,the torque is decoupled from the suspension force,and the suspension control adopts direct instantaneous torque control(Direct Suspension Force Control,DSFC);in the commutation In the interval,considering the coupling relationship between the torque freewheeling current and the levitation current,the design adopts the variable bias direct levitation force control method.Considering that the practical application of the energy storage motor is to recover energy during the braking process of the electric vehicle,the power of the motor needs to change with the change of the external input power,so a power tracking control method is proposed,and the power is controlled with the output power of the driving motor as the target.track control.Finally,a high-speed digital control system for dual 8/4 maglev switch reluctance energy storage motors is designed with dSPACE as the core,including power converters,optocoupler drives,displacement signal detection,position signal detection,current signal detection and other circuits.The torque system and suspension force system of the motor are verified,which confirms the feasibility of the prototype design.