高精密电磁离合器非线性转矩特性

Nonlinear torque performance of high-precision electromagnetic clutch

利用精密电磁离合器的轴对称有限元模型,对目标电磁离合器的非线性转矩特性进行了分析,并用试验方法验证了数值分析结果.考虑微小空隙时的轴对称模型给出的转矩分析结果比试验方法得到的转矩平均高出7.52%,这表明本模型可以充分预测实际的转矩大小.同时也对21V,24 V和27 V下电枢所受磁场力与空隙(转子与电枢间)的非线性关系曲线进行了数值分析.

The non-linear friction torque of a high precision electromagnetic clutch is studied by using an axi-symmetric finite element model. By discussing the rationality of analysis process and analytical resuits, analytically predicted static friction torques are compared with experimental torques. Air gaps of each mechanical parts are considered in the axi-symmetric FEM model. The predicted torques by FEM model are 7.52% higher than experimental torques, which proves the validity of FEM model. Non-linear magnetic force distributions related to air gap （between rotor and armature）under applied voltages of 21 V,24 V and 27 V are also presented.