Research On Parameter Matching And Temperature Field Of Compound-Structure Induction Motor Used For Hybrid Vehicle

Hybrid electric vehicle(HEV),which not only has traditional fuel vehicles' power and endurance capacity but also high fuel economy,has become an irreplaceable transitional product in the transformation of automobile industry.It will certainly make a great contribution to energy conservation and emission reduction worldwide for a long time to come.Toyota Hybrid System(THS)is relatively advanced in the market,with a planetary gear and two separated electric motors.Some scholars suggest using Compound-Structure Motor(CSM)which is integrated with two motors and can replace planetary gears.The system with CSM motor is what we called Electric Variable Transmission(EVT).In this paper,the parameter matching and temperature field of CSIM(Compound Structure Induction Motor which is one of the Motor applied to EVT system)are mainly studied;The main research contents are as follows:Firstly,the parameters of CSIM have been keeping matched.Analyzing the Toyota Hybrid System II(THS-II),the coupling relationship between power split and mechanical has drawn a conclusion.Based on which,the parameters of CSIM has also been keeping matched with that of THS-II.The basic parameters like speed,torque etc.The feasibility of the matched parameters were confirmed through simulating,in comparing the fuel economy of EVT system based on CISM with Prius based on THS-II.Then,with the structure model of CSIM confirmed,the loss of CSIM,including copper loss,core loss,eddy current loss and mechanical loss were analyzed;the finite element analysis has also been carried out to analyze the size and distribution of loss.After that,the parameters related to the temperature field were analyzed also.The application of equivalent winding has simplified the structure of winding copper wire and insulation impregnating paint.The introduction of equivalent thermal conductivity coefficient to deal with the heat transfer in air gap has simplified the model.And the heat transfer coefficient of different materials consisting of each component in CSIM has been researched and verified.And the finite element simulation analysis of CSIM has been carried out,the feasibility of cooling method was verified.Finally,the temperature of CSIM under water-cooling condition is calculated and analyzed in equivalent thermal path method.After the equivalent thermal resistances of each component were verified,the equivalent thermal circuit diagram of CSIM has been established and the analysis have been made.By comparing the temperature of each component of CSIM between finite element simulation and equivalent thermal path method,The feasibility of the equivalent thermal path method is determined...