储能飞轮系统热分析

Thermal analysis of energy storage flywheel system

从储能飞轮的热源电机和电磁轴承的损耗进行分析,确定主要的传热方式。用ANSYS软件手段对储能飞轮系统进行温度场和热应力简化模拟分析。研究结果表明:若产生的热量没有及时散出,随着环境温度的逐渐增高,上支座最大等效应力也随之增大。当环境温度升高到100℃时,最大等效应力达到414. 6 MPa,造成上支座的变形和机械轴承的预紧力增大,进而影响到轴承旋转精度和飞轮转子的稳定性;下支座随环境温度及载荷温度的升高,电机定子对电机转子的热辐射也随之增强,最高达140℃。温度过高使磁铁寿命缩短,影响储能飞轮系统的稳定运行。

The loss of heat source motor and magnetic bearing of energy storage flywheel is analyzed,and the main heat transfer mode is determined.Using ANSYS software to simulate and analyze the temperature field and thermal stress of energy storage flywheel system.The results show that:If the heat generated does not dissipate in time,the maximum equivalent stress of the upper support will increase with the increase of ambient temperature.When the ambient temperature rises to 100℃,the maximum equivalent stress reaches 414.6 MPa,which results in the deformation of the upper support and the increase of the preload of the mechanical bearing,thus affecting the rotational accuracy of the bearing and the stability of the flywheel rotor.With the increase of ambient temperature,the thermal radiation from motor stator to motor rotor also increases,up to 140 C.High temperature shortens the life of magnet and affects the stable operation of energy storage flywheel system.