Design And Research Of Vehicle Flywheel Battery Motor And Supporting System

Due to the shortage of energy and the growing problem of global warming,pollution-free electric vehicles and energy-saving hybrid vehicles have become one of the future development trends of the automobile industry.Flywheel batteries have broad application prospects in electric vehicles and hybrid vehicles due to their advantages of high specific energy,large specific power,short charging time,and no environmental pollution.The high-speed motor as a key part to realize the charge and discharge of the flywheel battery seriously affects the work efficiency of the flywheel battery.As the support system of the flywheel battery,the magnetic bearing also directly affects the performance of the flywheel battery.In order to ensure the stable operation of the flywheel battery under the condition of multi-interference vehicles,high requirements are placed on the performance of the high-speed motor and the topology design of the magnetic suspension support system.The main research contents of this article are as follows:Firstly,the research background of vehicle flywheel battery is introduced,and the working principle of vehicle flywheel battery is explained in detail.It summarizes the research status and development trend at home and abroad,discusses the key technical difficulties of vehicle-mounted flywheel batteries,and points out the significance and purpose of this study.Secondly,this paper summarizes the selection of vehicle flywheel battery motor and the vertical placement of flywheel battery can reduce the dynamic load caused by the foundation movement and its gyro effect Based on the above analysis,the on-board flywheel battery is placed "vertically" The topological structure of vertical and compact type suitable for on-board application is determined.This paper points out the design requirements of 3-DOF magnetic bearing: high stability and low energy consumption,which points out the direction for the specific design of magnetic bearing in the following paragraphs.The selection,design and optimization requirements of on-board flywheel battery motor are summarized to lay a foundation for the design and optimization of subsequent motor.Thirdly,Select the permanent magnet brushless DC motor as the driving motor of the vehicle flywheel battery system,select and parameterize the various parameters of the motor and analyze the electromagnetic performance of the no-load magnetic density and the effect of the load armature reaction,and optimize the permanent magnet of the motor Design,select the output torque,no-load cogging torque and permanent magnet area as the optimization targets,and use multi-objective genetic algorithm analysis results show that the cogging torque is greatly reduced,so that the output torque ripple is also reduced accordingly,the optimization result Meet the requirements of vehicle flywheel battery system.Finally,to meet the requirements of high-speed stable operation and low power consumption of the vertically placed vehicle flywheel battery system rotor,a new three-degree-of-freedom magnetic bearing-damper device was proposed.It not only has the function of controlling the suspension of the magnetic suspension rotor,but also the damping unit can effectively suppress the vibration,thereby reducing the amplitude by an order of magnitude.Different from the general symmetric permanent magnet structure,the upper and lower asymmetric permanent magnets used in this article can reduce the axial power loss under the same bearing capacity design,and the power loss can be reduced by 45%.