环氧树脂制备电机槽楔高温力学性能研究

Research on Elevated Temperature Mechanical Properties of Motor slot Wedge Prepared by Epoxy Resin

环氧树脂制备电机槽楔的力学性能与温度变化规律的研究较少。为了明确环氧树脂力学性能与温度的变化规律,该研究采用两种型号(0902、482)的槽楔在20℃和155℃条件下测试了其力学性能:抗压强度、抗弯强度、冲击韧性、线性剪切强度;在20℃、120℃和155℃条件下进行了蠕变实验,建立了寿命预测模型。实验结果表明:0902试件的压缩和线性剪切强度均优于482试件,冲击韧性劣于482试件;0902的压缩、线性剪切性能对温度的敏感性比482小,抗弯强度、冲击韧性对温度敏感性比482大。建立了0902和482试件不同温度下寿命的预测模型,均具有较好拟合优度。为寿命预测提供了依据,对槽楔在电力系统、电机设备中的使用具有非常重要的参考意义。

There are still few researches on the mechanical properties and temperature variation of motor groove wedge prepared by epoxy resin.In order to clarify the changes of mechanical properties and temperature of epoxy resin,two types of slot wedges(0902 and 482)were used to test their mechanical properties at 20℃and 155℃:linear shear strength,compressive strength,impact strength and bending strength.The creep experiments were carried out at 20℃,120℃and 155℃,and the life prediction models were established.The experimental results show that the compressive strength and linear shear strength of 0902 sample are better than 482 sample,but the impact toughness and bending strength is worse than 482 sample.The compression and linear shear properties of 0902 are less sensitive to temperature than 482,but the bending strength and impact toughness are more sensitive to temperature than 482.Lifetime prediction models of 0902 and 482 at different temperatures were successfully established,and both had good goodness of fit.It provides a basis for life prediction,and has a very important reference significance for the use of slot wedge in power system and motor equipment.