大功率矿用盘式永磁偶合器软启动瞬态温度场研究

Research on Transient Temperature Field in Soft Start of High-power Mine Disc Permanent Magnet Coupling

针对大功率矿用盘式永磁偶合器软启动过程中高热损耗、实时变化温度仿真难题,提出将热损耗函数导入瞬态温度场的计算方法。首先对热损耗变化进行理论计算,可知软启动热损耗随时间变化呈三次方函数关系;然后采用流固耦合速度仿真得到散热系数为136.01 W/(m2·K);最终完成软启动瞬态温度分布计算,可知最高温度为70.4℃,软启动30 s完成后,铜盘温度为63.7℃,温升在安全运行标准允许范围内,为大功率永磁偶合器软启动温度调控研究提供了理论依据。

Aiming at the simulation problem of high heat loss and real-time change of temperature during the soft start process of high-power mine disc permanent magnetic coupling, a calculation method of introducing heat loss function into transient temperature field was proposed. Firstly, the theoretical calculation of the heat loss change shows that the soft start heat loss changes with time as a cubic function. Then the fluid-structure coupling speed simulation was used to obtain a heat dissipation coefficient of 136.01 W/(m2·K). Finally the soft start transient temperature distribution calculation was completed,the maximum temperature is 70.4 ℃,after 30 s of soft start, the temperature of the copper plate is 63.7 ℃,and the temperature rise is within the allowable range of safe operation standards,which provides a theoretical basis for the study of soft start temperature control of high-power permanent magnet couplings.