Optimization of the heat sink in servo drive unit using response surface method

JIN Jian, WANG Yong, ZHANG Hangjun, LIU Wenjie, MEI Qin

(School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China)

Abstract: Aiming at reducing the IPM temperature rise of the servo drive unit during the operation process, the numerical simulation technique was investigated. After the analysis of the influence of the geometric parameters of heat sink on the IPM temperature rise, a secondorder response surface model of the IPM temperature rise about the base height of the heat sink, number of fins and fin thickness was established by the 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 evaluated by the analysis of variance and goodness of fit test, and the optimized scheme of the heat sink was tested by the numerical simulation in the CFD software. The results indicate that the error margin of the model is less than 2.88% which means the mathematic relation between the IPM temperature rise and the geometric parameters of heat sink can be accurately fitted by the model, and in the optimized scheme, the IPM temperature rise is reduced by 5.48 ℃, which can effectively increase the reliability of the products and provide reference for the optimization of the heat sinks in the servo drive units or other similar structures.

Key words: servo drive unit; heat sink; uniform design; response surface methodology; thermal simulation