| Since the 21 st century,environmental and energy issues have become an important topic of global concern.Energy storage is an important way to realize the efficient utilization of energy and solve the energy crisis.As the representative of high-efficiency green energy storage,flywheel energy storage is widely used in electric vehicles,wind power generation,UPS power supply,rail transit and other fields,especially in automotive applications has great potential.In view of the problems existing in the flywheel energy storage device at present,a flywheel energy storage device combining flywheel and magnetic coupling drive mechanism(FES-MCD)is proposed in this paper.The new device has the functions of electric drive type and mechanical flywheel energy storage system.The main research work includes:By comparing the advantages and disadvantages of the existing mechanical and electric drive flywheel energy storage devices,a flywheel magnetic coupling drive,which combines flywheel and magnetic coupling drive mechanism,is proposed.From the perspective of magnetic field analysis,the transmission principle of the core component of the device-magnetic coupling transmission mechanism is analyzed,and the operational characteristics of the device are analyzed by graphical method,which provides a theoretical basis for the design of FES-MCD.Combining the flywheel energy storage magnetic coupling drive with the double rotor motor,a FES-MCD modified EV power system is proposed.The working mode of the system under different working conditions is analyzed in detail,and the dynamic model of the system is established.Combining the application requirements of the system on a certain electric vehicle,the performance target design parameters of the FES-MCD prototype are extracted,and the overall structural design of the FES-MCD and the strength analysis of the key components are completed.The structural parameters of the V-type built-in permanent magnet rotor are optimized.Based on centrifugal force and deformation coordination mechanism,the analytical expression of the V-type built-in permanent magnet rotor is derived,and the correctness of the analysis method is verified by finite element simulation.The response surface method is used to quantitatively analyze the electromagnetic properties of two pairs of pole V built-in permanent magnet rotors,and the relationship between the structural parameters of the rotor and the peak torque is obtained.Finally,based on the improvement of rotor structure and electromagnetic performance,a multi-objective optimization model is established,which provides a reference for the structural optimization of V-type built-in permanent magnet rotor in magnetic gears.The simulation experiment was carried out on the prototype,and its steady-state performance and dynamic response characteristics of each rotor during start-up,energy storage and discharge conditions were analyzed.The Maxwell software is used to analyze the magnetic field distribution characteristics of the inner,middle and outer air gaps of the magnetic coupling transmission mechanism and the peak torque of the rotor.The joint simulation model of the device is established by the time-step finite element method,the control of three-rotor and the joint simulation calculation of magnetic coupling is realized.The results show that the operating characteristics of FES-MCD are consistent with the theoretical analysis. |
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