鼠笼异步磁力联轴器三维温度场有限元分析

Analysis on 3-D Temperature Field of Squirrel-cage Asynchronous Magnetic Coupling

为得到鼠笼异步磁力联轴器工作时内部温度分布情况,首先通过理论计算确定了该联轴器的热源、导热系数和散热系数,然后借助ANSYS软件对其进行三维温度场模拟分析,得到磁力联轴器整体和各部分的温度分布,并通过场分析法,将温度场沿定义的路径进行映射,得到不同路径下的温度分布规律。结果表明:导条的最高温度为82.42℃,永磁体的最高温度为51.47℃,远小于永磁体的居里温度。沿径向由内转子轴孔到外转子外边界,温度分布是先高后低,具有明显的区域性,导条区域的温度最高且温差最小,气隙区域的温差最大;沿导条周向的温度分布呈周期性变化,其曲线近似为正弦曲线,周期为导条数。分析结果对大功率下的鼠笼异步磁力联轴器的温度场分析具有指导意义。

In order to obtain the internal temperature field distribution of the squirrel-cage asynchronous magnetic coupling in working, the heat source and the heat conductivity and the heat transfer coefficients of the magnetic coupling were firstly determined by the theoretical calculation. And then the finite element method was used to simulate the 3-D temperature field, so the temperature distribution values of the each part were obtained. Through the field analysis, the temperature distribution rule was obtained under different paths. The results show that the highest temperature of copper bar is 82.42℃ and the highest temperature of permanent magnet is 51.47℃ which is far away from the Curie temperature. Along the radial direction, from the axle hole of inner rotor to the boundary of outer rotor, the temperature distribution shows apparent regional characteristic from high to low. The differences in temperature between the air gap areas are the greatest; and the highest temperature region is located in copper bar, but the differences in temperature are the minimum. Along the circumferential direction, the temperature distribution of copper bar is a periodic variation as a sine curve. The cycle is the number of copper bar. The analysis results have a guiding significance for the temperature field analysis of high power squirrel-cage asynchronous magnetic couplings.