电热形状记忆合金驱动的磁流变液离合器传动性能研究

To solve the problem of the too small rotational torque of a single cylindrical magnetorheological fluid clutch, a cylindrical - disc magnetorheological fluid transmission method driven by electrothermal shape memory alloy is proposed. By using the thermal driving characteristics of the shape memory alloy, the working gap of the magnetorheological fluid changes from a single cylinder to multiple working gaps of cylinder - disc, improving the transmission performance. Based on the shape memory effect, the relationship between the thrust of the electrothermal shape memory alloy and the temperature is obtained. Through the finite element analysis of the magnetic field, the magnetic field intensity and distribution of the cylindrical - disc magnetorheological fluid transmission device are obtained. Based on the Bingham model, the relationship between the transmission torque of the magnetorheological fluid and parameters such as magnetic field intensity and structural dimensions is obtained. The research results show that the torque transmitted by the cylindrical - disc magnetorheological fluid transmission device is increased by 42% compared with that transmitted by a single cylindrical magnetorheological fluid transmission device.

为解决单一圆筒式磁流变液离合器转动转矩过小的问题,提出了一种电热形状记忆合金驱动的圆筒-圆盘式磁流变液传动方法,利用形状记忆合金的热驱动特性使磁流变液的工作间隙由单一圆筒变成圆筒-圆盘多工作间隙,提高了传动性能;基于形状记忆效应,得出了电热形状记忆合金推力与温度的关系;通过磁场有限元分析,得出了圆筒-圆盘磁流变液传动装置的磁场强度及分布情况;基于Bingham模型,得出了磁流变液传动转矩与磁场强度、结构尺寸等参数的关系。研究结果表明:圆筒-圆盘式磁流变液传动装置传递的转矩比单一的圆筒式磁流变液传动装置传递的转矩提升了42 %。