Design And Research Of Electronic Water Pump Motor On New Energy Vehicle

Automotive electronic water pumps are the power source of water circulation systems for new energy vehicles and other emerging models.Permanent magnet brushless DC motors(BLDC)are the mainstream drive motors for automotive electronic water pumps,and they are the future development trend of motors.However,due to various limitations,the efficiency of existing electronic water pumps on the market is often less than 35%,and the efficiency of dedicated motors for water pumps is often less than 70%.This situation restricts the development of electronic water pumps.Therefore,the research and induction of the design method of the special motor for high-efficiency water pumps is very important for the development of electronic water pumps.Firstly,the viscous damping theory is selected as the basic theory of this paper,and the calculated motor size directly meets the requirements of the desired mechanical characteristics.Simultaneously,the investigation and disassembly of various automotive electronic water pumps in the market can obtain the general performance indicators,prices and design concepts of such motors to guide the design.Secondly,according to the theoretical research,a design calculation program for the electromagnetic structure of the motor was written in MATLAB IDE.The theoretical calculation results,motor constants,and design concepts established by market research were input into the special software RMxprt for parametric design of the motor.In this way,the initial design performance of the motor can be obtained through simulation analysis.Then,using the “parameter optimization” function of the software,the influence trends between various performance parameters and multiple design parameters of the motor can be obtained.Using these trends can change the initial design and make the design more mature.Pass the motor design parameters to ANSYS Workbench,use the data correlation analysis module to analyze the rotor parameters,and then select the optimal variables based on the results of the parameter analysis,and return these variables to ANSYS Electronics Desktop to participate in the Multi-objective Genetic Algorithm(MOGA)based motor optimization design,and the obtained results are simulated and analyzed after simulation.The optimized motor meets the design requirements.Among them,all simulation analyses in RMxprt were verified with electromagnetic finite element analysis in Maxwell.Finally,after the optimization design,the rotor structure is designed using the rotor parameters obtained by the optimization design.The independently designed rotor was replaced and tested in the environment of an electronic water pump of the BMW N52 engine,and compared with the performance test results of the original electronic water pump,the performance changes and efficiency improvements of the electronic water pump with the new rotor compared to the original product were obtained.The difference between the virtual simulation results and the actual experimental results is small.In this paper,the design method of electronic water pump motors for new energy vehicles is studied through programming development,parameterized design,finite element analysis(FEA),and multi-objective optimization design.The method of designing the electromagnetic structure of pump-specific motors is explored.The difference between the simulation results and experimental results is small,which proves the feasibility of the design method studied.This method can provide a reliable reference for the development of permanent magnet brushless DC motors.