Research On Cooling And Temperature Control System Of Port-oriented Heavy-duty AGV Motor Driver

With the acceleration of economic globalization,the transportation volume of container terminals has also increased rapidly.How to improve port handling efficiency has always been the goal pursued by automated terminals.Among them,high-speed heavy-duty AGV(unmanned autonomous navigation vehicle)is one of the key equipment of the port automatic handling system,and the motor driver is a control part of the high-speed heavy-duty AGV motor.Its good performance is the overall stable operation and long operation of the autonomous navigation vehicle.An important guarantee for battery life.The IGBT module is the main heating component of the motor driver.Controlling its working temperature is always within the normal temperature range to help ensure the performance of the driver.This project takes port heavy-duty AGV motor driver as the research object,and uses the knowledge of heat transfer and fluid mechanics to conduct thermal resistance model of liquid cooling scheme,heat transfer characteristics of fin radiator,temperature field of IGBT module and its temperature control strategy.The research was carried out,and then the drive cooling and temperature control system was optimized.First of all,this paper designed the initial scheme of the motor driver liquid cooling temperature control system according to the actual working conditions,and selected the appropriate cooling method,cooling medium,radiator structure and materials under this scheme.Then use the simulation software FLUENT to conduct thermal analysis,study the temperature field distribution of the motor driver cooling temperature control system,and change the structural parameters of the fin heat sink,focusing on exploring the fin height,fin thickness,fin spacing,and substrate thickness to the IGBT mode The influence rule of the junction temperature of the group is a preliminary exploration for the next optimization design of the fin heat sink.Secondly,based on the principle of thermodynamics,a heat transfer calculation model of finned radiator fins is established in this paper,and the influence of structural parameters of finned radiators on heat transfer characteristics is analyzed from the perspective of thermodynamics.In order to eliminate the secondary factors and reduce the workload of subsequent optimization,the orthogonal and experimental methods were used to analyze the primary and secondary factors affecting the heat transfer characteristics of the fin radiator,and then the fin height,fin thickness,The regression equation of the number of fins on the junction temperature of the IGBT module is analyzed.The influence of various factors on the junction temperature of the IGBT module is analyzed.The regression equation is used to obtain the parameter combination of the fin radiator to achieve the best heat dissipation effect.Thirdly,in order to solve the problems of hysteresis and time variability of the temperature control system,a fuzzy PID control strategy is proposed to improve the response speed of the temperature control system.The fuzzy control algorithm was simulated by MATLAB,and the step response curve of the temperature control system was obtained.The simulation results show that the fuzzy control algorithm has no overshoot,shorter adjustment time and higher robustness.Finally,a test rig for the cooling and temperature control system of the motor driver was set up,and it was experimentally verified that the liquid cooling scheme can meet the design requirements.At the same time,in view of the harsh environment of the port,the cooling and temperature control system of the motor driver was designed for sealing and safety protection,and passed the test verification.