| 摘要 |
A small electric motor having a plurality of commutator segments disposed at equal intervals in the angular positional direction on an insulating cylinder fixedly fitted to the rotating shaft of a motor rotor, and brushes for making electrical contact with the commutator segments, wherein reservoirs for holding an electrically conductive mixture are provided by boring the insulating cylinder in such a manner that the reservoirs extend to the adjoining commutator segments, the electrically conductive mixture being injected into the reservoirs so that the mixture is deposited in such a manner that the mixture bridges each commutator segments and covers the intervening portions between the commutator segments, the reservoirs being disposed in the locations at which the commutator segments and the brushes do not contact.
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