Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1989-03-02
1990-12-25
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Rotary
310186, H02K 110, H02K 2126, H02K 2304
Patent
active
049805932
ABSTRACT:
A direct current dynamoelectric machine is disclosed including plural main poles on a field frame with a wound armature rotatably mounted therein. The main poles utilize high-strength permanent magnets which are thick enough to supply a magnetic field, but having means at an edge portion thereof (such as at the trailing edge on a D.C. motor) for increasing the air gap towards that edge to resist demagnetization resulting from armature reaction. Particularly, the permanent magnets of the main poles include a concentric portion of constant thickness and a flared portion of the same constant thickness, wherein the flared portion joins the concentric arc portion in a tangential manner. The dynamoelectric machine also includes permanent magnet interpoles between the main poles, wherein each permanent magnet for each interpole is supported nearby the armature surface by a means that is magnetically non-conductive so that flux from the permanent magnet interpole is limited by an effectively large air gap to a value appropriate for the strength of an interpole.
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LaBalle Clayton E.
Stephan Steven L.
The Balbec Corporation
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