Research On Heat Dissipation Of Servo Driver Based On Numerical Simulation

Servo Driver,as a linker between the NC system and servo motor,is one of the most important functional parts of NC machine.Its reliability determines the quality and reliability of NC machine.With the development of technology,NC servo driver tends to develop towards high reliability and high power density.Thermal analysis and management have become a tough problem for the growth of the reliability.Based on this back ground,thermal investigation of the thermal failure,parameters optimization of the cooling system were conducted.According to the failure of the rectifier module at the low current levels,the problem was considered by numerical simulation.The results show that the poor heat dissipation is the main casuse of the failure,and the structure of double thermal interface materials(TIM)is the important reason for the high temperature rise.The thickness and thermal conductivity of TIM has great effect on the chip heat dissipation.There is a non-linear relationship between the thermal conductivity of TIM and the temperature rise of the module.Aiming at optimizing the multi-objective parameters of the cooling system of the inverter module,the numerical simulation model was investigated.After the analysis of the influence of the geometric parameters of heat sink and air flow on the IPM temperature rise,a third-order response surface model of the IPM temperature about the base height of the heat sink,number of fins and fin thickness was established by combination of uniform design of experiments and polynomial fitting.A method was presented to optimize the heat sink based on the response surface.The accuracy of the model was evaluted by the analysis of variance and goodness of fit test,and the optimized scheme was tested by the numerical simulation in the CFD software and experiment.The results indicate that this method has the advantages of less test times and reliable prediction accuracy,and the performance of the cooling system is improved obviously after the optimization.In the background to improve the thermal reliability of the NC servo driver,the thermal analysis of the rectifier module failure,the optimization of the multi-objective parameter of the cooling system were studied by numerical simulation and experiment.The research results are meaningful for the reliability growth of the NC servo driver.