Miniature rotary machinery with brushgear

Details Miniature rotary machinery with brushgear Miniature rotary machinery with brushgear

1986-12-02

1988-06-07

Budd, Mark O.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 40MM, H02K 1300

Patent

active

047498994

ABSTRACT:
Miniature rotary machinery with brushgear comprising two arm guides, to which power supply voltage is fed, provided on the inside of a motor case cover; and brush arms having brushes at the tip thereof and brush arm eyes, for rotatably engaging with the arm guides, at the other end thereof, and spring receptacles, made of an insulating material, at the center thereof; both ends of an arc-shaped leaf spring being engaged with the spring receptacles to impart pushing force to the brushes by the resiliency thereof; the brush arm eyes being disposed so as to make contact with the arm guides at a predetermined angle; each of the brush arm eyes having a formed portion whose crosssection includes two mutually intersecting tangent lines making contact with the circular crosssection of the arm guide so that two-point contact is established between the formed portion and the arm guide, when viewed in the crosssectional direction; and if necessary projections or ridges provided on the outer circumferential surface of the arm guides, or on the inner circumferential surface of the brush arms so as to ensure positive electrical contact between the arm guides and the brush arm eyes.

REFERENCES:
patent: 1798394 (1931-03-01), Angus
patent: 3450916 (1969-06-01), Mabuchi
RCA Technical Notes, No. 262, Jun. 1959.

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