Analysis Of Coupled Field For The Motor-transmission Integrated Design

Increasingly serious environmental and economic problems have prompted urban traffic toward the development of clean, efficient and sustainable direction, also contributed to the promotion and application of new energy transportation technology. Pure electric vehicles with its light weight, low noise, zero emissions, etc. become the main force of the future of urban transportation. Currently, most of the power and transmission system of pure electric vehicle are achieved by the matching of motor and transmission of fuel vehicles. Its performance can be improved to a certain extent through some optimization matching methods, but the installation dimensions and weight will hinder its development. Therefore, in the future motor-transmission integrated design for pure electric vehicles will be the direction of development of design of drive system for pure electric vehicle.This thesis studied the motor-transmission integrated design theory with the traditional mechanical design theory and multi-field coupling method, and proposed a design method considering multi-field coupling effect; determined the transmission program, and used the equivalent circuit method to pre-design electromagnetic parameters with the vehicle parameters, designed and verified the parameters of structure and dual-clutch by using traditional mechanical design method; discussed and calculated the main loss in the system; established the limited element analysis model by using the finite element method; did the coupling analysis with the load-transfer method, and got the distribution of steady state and transient temperature field, thermal stress and heat distortion case of the key components of the system; discussed the coupled finite element analysis results, and ultimately verified the feasibility of the program.