3823 直流モータのフラッシュオーバ現象 : 回転子の影響を考慮した場合

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This paper deals with the pattern formation of a commutator of direct current motors. The pattern formation refers to the polygonal deformation phenomenon of the commutator's surface. The cylindrical surface of the commutator is deformed into a certain convex polygon during operation. Direct current motors are used for main motors, compressor motors and motor generators of trains. If this phenomenon occurs, the train cannot continue driving any more. In some cases, the power supply at substation is cut-off. The authors describe the modeling of the system, regarding this phenomenon as an unstable vibration of brushes due to the time lag. In this modeling, authors take the effect of rotating shaft into account. Through the calculations it was made clear that (1) the unstable vibration tends to occur around the natural frequencies of the brush and the rotating shaft, and (2) the commutator's polygonal number in the actual machine agreed well with the calculated unstable regions.
2000-07-31