变齿距电磁作动器集中参数热模型的构建与分析

Modeling and analysis of lumped thermal parameter of variable tooth electromagnetic actuator

中文关键词: 变齿距电磁作动器  集中参数热模型  样机试验  敏感性分析  冷却方式

英文关键词: variable tooth electromagnetic actuator  lumped parameter thermal model  prototype test  sensitivity analysis  cooling method

中文摘要:

      根据变齿距电磁作动器的几何结构和传热特点,建立其集中参数热模型。对加工好的样机温度进行了试验测量,并将集中参数热模型的计算结果与试验数据进行了对比,结果表明,在不同线圈电压下,作动器线圈和外壳温度的最大相对误差仅为8.40%和9.22%,证明了所建立模型的有效性。利用所建立的集中参数热模型,研究了作动器温升对各个热阻的敏感性。结果表明作动器温升对外壳与环境之间的散热热阻最为敏感,当其增加20%时,线圈温度和外壳温度将分别增加6.10%和8.40%,而其它热阻对作动器的线圈和外壳温度的影响都非常小。最后,对变齿距电磁作动器的冷却方式进行了探讨,高电密的情况下,在外壳设计散热肋片是提高冷却效果的实用方式。

英文摘要:

      The lumped parameter thermal model was established according to the geometric structure and heat transfer characteristic of variable tooth electromagnetic actuator. The temperature test bench of the processed prototype was set up to validate the accuracy of the developed lumped parameter thermal model. The experimentally measured coil temperature and the surface temperature of shell were compared with the calculated values of the lumped parameter thermal model at different coil voltages and the maximum deviation of coil temperature is 8.40%, the surface temperature of the shell is 9.22%. The sensitivity of temperature rise to thermal resistances was studied by the lumped parameter thermal model. The results showed that the temperature rise of variable tooth electromagnetic actuator is most sensitive to the thermal resistance between the shell and the environment, and the coil and surface temperature would rise 6.10% and 8.40% respectively when the thermal resistance was increased 20%, and the other thermal resistances have little impact on the temperature rise of the actuator. Finally, the cooling methods of variable tooth electromagnetic actuator were studied and adding fins to the surface of the actuator shell is a practical method to improve the cooling effect. temperature of shell is 9.22%. The sensitivity of temperature rise to thermal resistances were studied by the lumped parameter thermal model. The results showed that the temperature rise of variable tooth electromagnetic actuator is most sensitive to the thermal resistance between shell and environment, and the coil and surface temperature would rise 6.10% and 8.40% respectively when the thermal resistance was increased 20%, and the other thermal resistances have little impact on the temperature rise of the actuator. Finally, the cooling methods of variable tooth electromagnetic actuator were studied and adding fins to the surface of the actuator shell is a practical method to improve the cooling effect.