Research On Optimization Design Of 210 Wheel Motor For E-bike

With the improvement of people's living standard,people's demand for energy is increasing day by day.The excessive consumption of energy causes climate warming and environmental pollution intensifies.The concept of green environmental protection is deeply rooted in the hearts of people,and the development and research of environmental friendly electric bicycle has been attracted more and more people's attention.The hub motor is the core part of the electric bicycle,its performance is critical to the operation of the vehicle.At present,the wheel motor is widely used in the market and has many disadvantages,such as low efficiency,high cost and short life.There is an urgent need to study a hub motor with stable performance,high reliability,low loss.And can meet the demands of some mountain riding and part of the market customers.This paper is combined with the requirements of production enterprises and has optimized design of a 210 permanent magnet hub motor to meet the requirements of different operating conditions such as climbing,mountain and hill.In this paper,the performance requirements of wheel motor under different operating conditions are analyzed in detail.Through the comparison of different driving modes and dynamic characteristics of the hub motor,and the driving scheme of the 210 permanent magnet wheel motor is established.Then the corresponding motor design parameters are established by analyzing the force condition of the motor.According to the design theory of the permanent magnet motor,the main structural dimensions of the motor are calculated.By means of the concept of unit motor,the initial electromagnetic design scheme of hub motor is determined by comparing the different polar groove matching scheme and winding scheme,and the RMxprt model is built.Then,according to the characteristics of many electromagnetic design variables of the wheel motor,this paper adopts the improved genetic algorithm to optimize,and writes the Matlab algorithm program.And the design scheme before and after optimization is compared and analyzed.With the help of Ansoft finite element software,the optimized electromagnetic parameters are simulated.Under the Maxwell 2D model,and the static and transient field of the hub motor is analyzed.In order to improve the running stability and reliability of 210 wheel motor,two new methods are studied theoretically to suppress the cogging torque of the hub motor.One is to optimize the auxiliary groove size of stator teeth by response surface method.One is under the condition that the shape of the permanent magnet is invariable.Different materials for permanent magnets are combined.The validity of the two methods is verified by the finite element method.Finally,the rationality of the design scheme of the 210 permanent magnet wheel motor is verified by test.