D.C. Motor with primary and auxiliary magnetic poles

Details D.C. Motor with primary and auxiliary magnetic poles D.C. Motor with primary and auxiliary magnetic poles

1996-04-30

1998-03-03

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310254, 310256, 310156, 310152, H02K 2304

Patent

active

057239290

ABSTRACT:
A direct current motor for vehicle engine starters includes a plurality of primary and auxiliary magnetic poles made of permanent magnets arranged between a cylindrical yoke and a cylindrical sleeve inside which an armature is rotatably supported. In order to fixedly support each auxiliary magnetic pole in position between circumferentially adjacent two of the primary magnetic poles, the primary magnetic pole is formed with slanted faces on both circumferential sides thereof to provide a radially inwardly decreasing circumferential width and the auxiliary magnetic pole is formed with slanted faces on both circumferential sides thereof to provide a radially inwardly increasing circumferential width, so that the primary magnetic poles presses the auxiliary magnetic poles radially inwardly when the slanted faces abut each other. Alternatively, the auxiliary magnetic poles may be pressed radially inwardly by concave portions formed integrally with the yoke, pressing members interposed radially inside the yoke, or engagement tongues extending integrally from the sleeve.

REFERENCES:
patent: 4542314 (1985-09-01), Corbach et al.
patent: 4707630 (1987-11-01), Tomite et al.
patent: 4777717 (1988-10-01), Okamoto et al.
patent: 5109172 (1992-04-01), Pace
patent: 5276375 (1994-01-01), Hartel
patent: 5475276 (1995-12-01), Shiga et al.

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