Research In Vibration And Noise Of In-wheel Motor With Optimal Design

The development of the motor industry is drove,with the rapid development of the electric vehicle industry,because automobile enterprises launch a large number of new energy vehicle brands in front of the public with the call for national policy.It is gradually improved in motor technology at home and abroad,meanwhile,with the progress of performance such as Nd Fe B permanent magnet materials,the permanent magnet synchronous motor is become a hit research interest in the university scientific research institutes and research partment of the automobile industry.It has done a lot of research work in motor torque density,reduce the heat load,and promote efficiency by the whole industry.It is begun to focus on the vibration and noise of electric vehicle motors while paying attention to the operating performance of electric vehicles by both companies in the traditional automobile industry and universities and research institutes.It is affected the NVH（Noise,Vibration,Harshness）characteristics of an electric vehicles by the Vibration and Noise characteristics of electric vehicle motor directly,which has a great influence on the driving experience of drivers and passengers.It is taken as an example to explore the vibration and noise characteristics of the in-wheel motor by an outer rotor permanent magnet synchronous motor.The main work of the subject is as follows: Firstly,the radial electromagnetic force of the motor is theoretically analyzed,and the law of the influence of order and amplitude on the vibration and noise characteristics is determined.The modal analysis of in-wheel motor shells with different structures is carried out,and it is determined that this model can be used as the finite element calculation model of inwheel motor.ANSYS finite element software is used to simulate the vibration and noise characteristics of the in-wheel motor under load.Secondly,the influence factors and suppression measures of vibration and noise of inwheel motor are studied.The vibration and noise performance of in-wheel motors are compared under different rotor structures,different pole arc coefficients,different auxiliary slot schemes of stator teeth set and different control strategies.It is found that for the motor with the outer rotor structure: the vibration and noise characteristics of the surface-mounted motor are better than those of the built-in type.The rotor pole arc coefficient is 0.75,the vibration and noise characteristics of the motor are better.The asymmetrical rectangular auxiliary slot can be better optimized.The vibration and noise characteristics of the motor under the excitation of the current generated by the direct torque control,the vibration and noise characteristics of the motor are better.Finally,according to the previous research,the design of a 10-pole 36-slot in-wheel motor with a rated power of 10 k W and a rated speed of 500r/min is completed.According to the matching 15-inch wheel hub,the main dimensions of the motor are determined.The motor performance of the three pole-slot matching schemes is compared.The scheme of the motor winding is calculated.The no-load,load and vibration noise characteristics of the motor are simulated by ANSYS finite element software.The vibration and noise characteristics of the final solution are significantly improved.