Electric motor with brush card isolated from endframe

Details Electric motor with brush card isolated from endframe Electric motor with brush card isolated from endframe

1993-10-29

1995-05-09

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 43, 310 51, 310 91, H02K 0514, H02K 0524, H02K 1300

Patent

active

054143179

ABSTRACT:
There is presented an electric motor having a drive shaft, an armature and commutator fixed on the drive shaft, a metal housing disposed around the armature, permanent magnets disposed between the armature and the housing, and an endframe fixed to the housing. A discrete brush card is fixed to the housing and has a central cylindrical portion for retaining the commutator, and brush tubes extending radially from the central portion. The brush tubes are adapted to retain brushes and brush springs for urging the brushes into engagement with the commutator. The brush card is provided with tab portions having orifices therethrough and elastomeric grommets mounted thereon, the grommets having openings extending therethrough and aligned with the tab orifices. The endframe is provided with posts extending from an end wall thereof. The grommet openings are configured to receive, respectively, the posts to lock the grommets onto the posts. The grommets are at least in part disposed between the brush card and the endframe end wall to isolate the brush card from the endframe end wall.

REFERENCES:
patent: 3760209 (1973-09-01), Hult
patent: 3824416 (1974-07-01), van de Griend
patent: 4209723 (1980-06-01), Hamman
patent: 4303901 (1981-12-01), Grimm et al.
patent: 4340831 (1982-07-01), Kuhlmann et al.
patent: 4585968 (1986-04-01), Cambrodon
patent: 4602176 (1986-07-01), Baker
patent: 4922149 (1990-05-01), Isozumi et al.
patent: 5026476 (1991-06-01), Ishimoto et al.
patent: 5113106 (1992-05-01), Schmid

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