Research On Optimization Of Flywheel Of Electric Vehicle Auxiliary Energy Storage System

With the development of China's economy,the continuous construction of infrastructure,especially road construction,facilitates transportation and promotes the rapid development of the automotive industry.The development of fuel-based vehicles has led to many environmental problems.It is imperative to develop new types of environmentally-friendly energy.The emergence of electric vehicles has significantly reduced the emissions of fuel vehicles and injected new impetus into the sustainable development of green.When the electric car is driving on the city road,the frequency of the brake operation is high,and the energy of the brake brake is mainly wasted by the brake disc friction brake.In order to use the brake energy for secondary use,the flywheel energy storage form will be adopted.It is stored.As a kind of physical energy storage method,flywheel energy storage has become the focus of new energy for scholars because of its high energy storage density,fast charge and discharge speed,high efficiency and environmental protection,and long service life.In order to study the use of flywheel energy storage in electric vehicles,an experimental platform for electric vehicle flywheel assisted energy storage system was built.The experimental platform was used to simulate the recovery process of electric vehicle braking energy,thus storing energy for flywheels in electric vehicles.The practical application of the above makes a theoretical foundation.In the construction of the experimental platform,the kinematics control strategy of the control system is analyzed.The PID control strategy of the position loop is proposed,and its key hardware and software are expounded.On the basis of the construction of the experimental platform,in order to improve the energy recovery rate of the electric vehicle flywheel auxiliary energy storage system,the structure of the energy storage flywheel of the key component of energy storage is optimized.The improved differential evolution algorithm was used to optimize the energy storage flywheel structure with Matlab and Ansys finite element analysis software under the condition of safety factor 2.After optimization by algorithm,the energy storage flywheel structure with the highest mass storage density is obtained.On the basis of the algorithm-optimized energy storage flywheel,the structure of the energy storage flywheel spoke is designed to increase the effective radius of gyration,and finally the strength is checked to obtain the spoke structure.The mass storage energy density can be significantly improved,but the number of spokes has little effect on improving the mass storage energy density.The improved differential evolution algorithm and the spoke structure jointly optimize the design of the energy storage flywheel,which can effectively improve the mass storage energy density of the energy storage flywheel,and provide a new idea for designing the structure of the energy storage flywheel.Finally,through the strength check,the 3-spoke energy storage flywheel has a significant increase in mass storage energy density of 53.71%compared with the equal-quality disk energy storage flywheel.In order to study the difference of energy recovery between mechanical energy storage flywheel and magnetic energy storage flywheel,and to study the new hybrid flywheel energy storage mechanism,a new type of magnetic energy storage flywheel was designed,which was analyzed by Ansys Maxwell 16 finite element analysis.The software compares and analyzes the magnetic energy storage flywheels of different magnetization modes,and selects the optimal model3 to magnetize the permanent magnets.In order to reduce the influence of harmonics on the rotation of the magnetic energy storage flywheel,the orthogonal design method is used to further optimize the modulated iron block.Finally,the main harmonic value of the radial magnetic flux density in the magnetic energy storage flywheel of the optimized energy storage is increased by 6.77%,and the main harmonic value of the radial air flux density of the external air gap is increased by 7.53%,which significantly reduces the rotation of the magnetic energy storage flywheel.The moment undulation,the maximum kinetic energy that can be stored is 553.24J.This study designed and analyzed a new type of magnetic energy storage flywheel,which laid a theoretical foundation for the practical study of magnetic field modulated energy storage flywheel.