改性聚酰亚胺基复合材料在超声电机中的应用

Application of Modified Polyimide Based Composites in Ultrasonic Motor

针对超声电机的输出性能较差的问题,分析接触界面摩擦特性后制备了改性聚酰亚胺(PI)基复合材料。选用PI作为基体材料并优化功能组分配比,提高了摩擦界面的弹性模量和摩擦系数。采用超声波精密加工的方法在PI基复合材料表面加工不同面积密度的正方形织构。利用销盘式旋转摩擦试验机测试了接触界面的摩擦特性,并利用性能测试平台对超声电机的输出性能进行了测试。实验结果表明,改性PI基复合材料具有良好的承载能力和更高的摩擦系数,尤其是织构化超声电机的输出性能得到明显改善,其最高能量转换效率可达到47.12%,效率大于40%的输出力矩范围也增大到0.4~1.3 N·m。

In response to the problem of poor output performance of ultrasonic motors(USM),modified polyimide(PI)based composite were fabricated after analyzing the tribological properties of the contact interface.The elastic modulus and friction coefficient of the friction interface were improved by using PI as the matrix material and optimizing the formula ratio.Square textures with different area densities were processed on PI-based composite surface by ultrasonic precision machining.The friction characteristics of the contact interface were tested with a pin-on-disk rotating tribometer.The output performance of USM were tested using the performance test platform.The experimental results show that modified PI-based composite has good bearing capacity and higher friction coefficient.In particular,the output performance of the textured USM has been significantly improved.The highest energy conversion efficiency can reach 47.12%,the output torque range with an efficiency greater than 40%is also increased to 0.4–1.3 N·m.