DC motor with permanent magnet retaining structure

Details DC motor with permanent magnet retaining structure DC motor with permanent magnet retaining structure

1975-11-10

1978-01-31

Duggan, Donovan F.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 42, 310257, H02K 2126

Patent

active

040717941

ABSTRACT:
In a permanent magnet DC motor adapted for easy "drop-in" assembly within a generally cylindrical case having open and closed axial ends, a magnet retention member comprises a ring disposed within the case adjacent its closed end and provided with a plurality of resilient arms extending axially toward the open end, said arms grouped in pairs around the ring, each pair of arms disposed to receive an arcuate permanent magnet therebetween. The machine further includes an end cover adapted to close the open end of the case and provided with a plurality of fingers projecting axially between the pairs of resilient arms and being effective to bias the resilient arms to hold the arcuate magnets tightly against the inside of the case, the end cover further including a plurality of shoulders effective to cooperate with the ring to hold the arcuate magnets axially securely therebetween. The magnet retention member may include one or more studs projecting axially through openings in the closed end of the case to circumferentially orient the magnet retention apparatus and serve as mounting studs for the dynamoelectric machine.

REFERENCES:
patent: 3100270 (1963-08-01), Case et al.
patent: 3135887 (1964-06-01), Schaffan
patent: 3401281 (1968-09-01), Martin et al.
patent: 3445693 (1969-05-01), Crawshaw et al.
patent: 3489937 (1970-01-01), Mahev et al.
patent: 3631277 (1971-12-01), Ferdig et al.

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