Optimization Design Of Dual Rotor Permanent Magnet Motor For UUVs

The propulsion motor is an important part of Unmanned Underwater Vehicles.The performance of propulsion motor determines the maximum speed and maximum operation time.Dual Rotor Permanent Magnet motor(DRPM)a new type of propulsion motor that was used in some types of underwater vehicles.the traditional iterative design method can not provide fast and accurate design for the new structure motor.This paper presents a fast and effective multi-objective optimization method based on Multi-physics of DRPM,meanwhile the latest research results from domestic and abroad are used.This method takes into account the latest material technology,manufacture level,temperature rise and mechanical structure,and the theoretical calculation and experimental research is adopted(1)The magnetic analysis model of DRPM is studied and the accuracy of the analytical model is verified by the existing prototype.The analytical model is used to solve the design of silicon steel sheet and electrical parameters.The characteristics of iron loss and copper loss in high power DRPM are analyzed in detail,and corresponding copper loss and iron loss calculation are put forward.A magnetic Sensitivity analysis is carried out when the error of manufacturing and material performance are introduced.(2)A CFD method is used to analyze the convective heat transfer coefficient of rotating parts in DRPM.The convective heat transfer coefficient and the loss calculation value are given to the thermal analysis finite element model to calculate the temperature rise of the motor.The temperature rise characteristic of DRPM is analyzed,and the equivalent thermal network model with UUV is established.The temperature rise of the motor is calculated by using the established thermal network mode.The results are compared with the finite element model,and the calculation accuracy is verified to be good accuracy.The temperature rise of the motor under the maximum error of the loss and convective heat transfer coefficient is provided for the insulation level.(3)According to the design characteristics of DRPM,a DRPM electromagnetic-thermal-mechanical model is established.The electromagnetic properties of DRPM can be solved quickly and accurately according to these geometric parameters.The multi-objective NSGA-Ⅱ and improved MOPSO method to DRPM is used for DRPM multi-objective optimization design,and get the Pareto solution set of the frontier.The results show that the design method is greatly improved compared with the finite element method.Using the thermal network model to help select the final solution.The sensitivity analysis for the efficiency and windings temperature rise caused by various parameter errors is studied.(4)The optimized design method was used to optimize the power DRPM of 200 KW.The motor for experiment was manufacturing,and the control system based on DSP and CPLD was designed.The performance of the design motor was verified by using DRPM integrated test system.