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In order to reduce temperature rise of motor coils and controller IGBT, improve heat dissipation performance of the cooling channel for motors and controllers, and ensure that the cooling channel has low flow resistance, this paper takes the cooling channel structure of the driving system of a micro electric vehicle and a motor integrated with a controller as the research objects, and establishes a fluid-structure coupling analysis model of motors and controllers through CFD method. The internal velocity field, flow resistance characteristics, motor winding temperature field and IGBT temperature field under the original structure of the cooling channel are analyzed. The collaborative optimization method is used to intelligently optimize the structural parameters of the cooling channel for the motor and the controller, and seek the cooling channel structure with low flow resistance and efficient cooling performance. The results show that the original structure of the cooling channel has local vortexes and ffow dead zones, the ffow resistance of the cooling channel t is 31.87 kPa, and the maximum temperature of the motor winding is 120.04 °C. Under the condition of meeting the goal of an optimization of manufacturing process and ffow resistance, a structure with the most significant improvement of winding temperature rise is selected as the final optimization result. After optimization, local vortexes and flow dead zones of the cooling channel are improved, the flow is smoother, and the ffow velocity is more uniform. The flow resistance decreases significantly, and the ffow resistance decreases by about 12.5 kPa or 39.4% compared with the original model. The maximum temperature at the winding end of the optimized motor reduces by 3.28 °C or 2.7%. The research results can provide a theoretical reference for the design and improvement of the cooling structure of motors and controllers for new energy vehicles. [ABSTRACT FROM AUTHOR]

Aero-train is a new transportation with high speed and low energy consumption is based on the wing-in-ground effect(WIG). The Aero-train concept proposed Tohoku University in Japan in the first place and the relevant research carried out the support of the Japanese government. In this paper, the aerodynamic optimization design of LA203A is carried out by using genetic algorithm and numerical simulation method, the simulation analysis ground effect optimized airfoil, the influence of the ground clearance and the attack angle on the drag, lift and lift drag ratio of the -train and the aerodynamic characteristic is improved . CFD technology to the aerodynamic characteristic of AERO-1 with wings and optimized wings and the flow field characteristics around the front and rear wing, the aerodynamic characteristics of Aero-train with optimized wing, the wind tunnel test was in Jilin University. The lift-drag ratio of optimized airfoil which optimized by genetic algorithm method is 26% higher than the airfoil. The provides theoretical basis for the analysis of wing-in-ground effect and the research Aero-train. [ABSTRACT FROM AUTHOR]