Research On Application Of New Permanent Magnet Coupling Flywheel Energy Storage Device For Vehicle

Braking energy recovery technology is an effective way to relieve environmental and energy pressure.flywheel energy storage as a more green and efficient way of energy storage is widely used in many fields,especially in the automotive application has great potential.Combining the advantages of permanent magnet coupling drive technology and flywheel energy storage,this thesis innovatively proposed a new type of permanent magnet coupling flywheel energy storage device for vehicles,and carried out the following studies:Firstly,the structure and mechanism of the permanent magnet coupling transmission mechanism are described.The mechanism has the function of torque transmission and separation.Its core components are active shaft,driven shaft and permanent magnet ring.By adjusting the position of the magnetic ring of the permanent magnet,an axial force is generated on the contact end face of the main and driven shafts,thereby generating a friction torque,thereby realizing a change in the transmission relationship between the two shafts.based on the calculation theory and method of magnetization effect and steady magnetic field,this thesis deduces the calculation formula of axial force and friction torque.Secondly,based on the finite element analysis software Ansys Maxwell to build the simulation model of the core components.Simulation analysis of magnetization phenomenon,magnetic line distribution,axial force and friction torque of permanent magnet ring in three different positions.In addition,the influence of different permanent magnet ring parameters and transmission shaft diameter on axial force and friction torque is analyzed,which provides a basis for the design of a new type of permanent magnet coupled flywheel energy storage device for vehicles in this thesis.Again,the mechanical design scheme of a new type of permanent magnet coupled flywheel energy storage device for vehicles is determined.The contents include overall structure design,permanent magnet coupling drive mechanism design,energy storage flywheel design,gear train transmission ratio design,etc.Drawing 3D model of the device based on Catia modeling Software using virtual prototype technology.The post-processing method was adopted to simulate the disassembly and movement process of the device,and the stress analysis of the supporting rod and energy storage flywheel of the key stressed components in the device was carried out to verify the rationality and feasibility of the device design.Again,combined with the vehicle driving conditions,the driving process is divided into several time periods to analyze the working state and energy flow process of energy storage flywheel and permanent magnet coupling transmission mechanism in each time period.According to the dynamic principle,the calculation formula of effective energy recovery is derived,and the control strategy of permanent magnet coupled transmission mechanism is formulated.Finally,based on NEDC working condition,Matlab / simulink software is used to simulate and analyze the energy recovery effect of the new permanent magnet coupled flywheel energy storage device for vehicles.Simulation results show that the effective recovery energy of the device can reach 70000 J to 105000 J.At the same time,the effective recovery energy is negatively correlated with the combination position of permanent magnet magnetic ring,and positively correlated with the rotational inertia of energy storage flywheel and the gear train transmission ratio.