Wear Behavior of AuAg/AgCuNiCe/Cu Commutator in DC Micromotor: A Case Study
In this paper, continuous running test was conducted using the disk drive spindle micromotors used in automobiles DVD. The commutator and brush were made of AuAg/AgCuNiCe/Cu and AgPd/CuNiSn layered composite respectively. In order to investigate the wear behavior of the commutator, the micromotors were dissected after ran continuously for different time. The worn surface of the commutator and the brush were characterized using an SEM equipped with EDS. Also, the cross section of the commutator was analyzed. It was shown that the AuAg layer was not totally worn off until 1500 h of running test. AuAg transferred from the commutator to the brush. It was interesting that Au was found on the silver layer where the depth of wear crater surpassed the thickness of the original AuAg layer. Small particles enriched in Cu, Ni and Ce were observed on the contact surface of AgCuNiCe layer, which was thought to improve the wear resistance of the commutator. The wear mechanism was mainly slight abrasion whereas no effect of arc was found on the sliding contact area.
Sihai Jiao, Zhengyi Jiang and Jinglong Bu
Y. Wang et al., "Wear Behavior of AuAg/AgCuNiCe/Cu Commutator in DC Micromotor: A Case Study", Advanced Materials Research, Vols. 146-147, pp. 825-828, 2011