Direct current dynamoelectric machine of permanent magnet type

Details Direct current dynamoelectric machine of permanent magnet type Direct current dynamoelectric machine of permanent magnet type

1982-10-19

1985-01-01

Duggan, Donovan F.

Electrical generator or motor structure

Dynamoelectric

Rotary

310254, H02K 2128

Patent

active

044917562

ABSTRACT:
A d.c. dynamoelectric machine of permanent magnet type comprises an armature and a plurality of field poles, wherein each of the poles comprises a main pole part (a permanent magnet) composed by an integral combination of a first magnet formed of a magnetic material having a large coercive force and a second magnet formed of a magnetic material providing a high residual flux density and having an axial length larger than that of the armature core, and an auxiliary pole part juxtaposed and coupled to the permanent magnet and having a permeability higher than the reversible permeability of the permanent magnet, and an air gap for intercepting the path of leakage flux is defined between the permanent magnet and the auxiliary pole part.

REFERENCES:
patent: 3469129 (1969-09-01), Humphreys
patent: 3567979 (1971-03-01), Jaffe
patent: 3594599 (1971-07-01), West
patent: 3663851 (1972-05-01), Persson
patent: 3939371 (1976-02-01), Murakami
patent: 4110718 (1978-08-01), Odor et al.
patent: 4112320 (1978-09-01), Mohr
patent: 4237397 (1980-12-01), Mohr

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