Correlation between arcing phenomena and electromagnetic noise ofopening electric contacts

摘要

The authors observed the electromagnetic noise and surface changefor a Cu-C electric contact as a simulation model of a commutator motor.In case of Cu-C (anode-cathode), the duration of sporadic burst noisegenerates from arc discharge. The patterns of the burst noise at thestart of the arc are classified into three types, and the pattern ofsurface change corresponds to each pattern. When burst noise durationincreases, the melted area has a wide distribution on the electrodesurfaces and the authors have found a correlation between burst noiseand the electrode surface area. From these results, the authors proposeda method of noise control by controlling the melted area and showed afundamental noise control technique by electrode design withconsideration of the electrode form