减振材料位置对微电机金属电刷振动影响研究

为了提高微电机寿命和使用效率，对微电机中的金属电刷片位置阻尼效果进行研究。建立Rayleigh阻尼模型与材料损耗因子的关系。采用MSC.Marc有限元分析软件中的瞬态动力学模块，对橡胶材料在电刷片上的位置进行仿真优化设计。利用Polytec 激光扫描振动仪分别对橡胶在原位置与优化后的位置电刷片的振动量进行无接触振动测量，结果显示优化后，在3倍频处的振动幅值正转（CW）减少可以达到12.1 %，反转（CCW）减少可以达到11.2 %。证明该优化设计法能有效地改进电刷片的振动性能，对工程实践具有一定的参考价值。

Study On location of Damping Material for Vibration of Metal Brush Of Micromotor

In order to increase the lifespan and efficiency of micromotors, the damping effect of the metal brushes of micromotors is studied. The relationship between Rayleigh damping model and dissipation factor of materials is established. The location of rubber damper in the structure is simulated and optimized by means of the transient dynamic analysis module of MSC.Marc. Meanwhile, the vibration magnitudes of the metal brushes are measured with Polytec Scanning Vibrometer when the rubber damper attached at the original and optimal locations respectively. The results show that the vibration magnitude of triple frequency after the optimization can be reduced to 12.1 % (clockwise rotation) and 11.2 % (counterclockwise rotation) respectively. This method can improve the vibration performance of metal brushes. It is of significance for engineering practice.