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US 5,175,460 AGranted
Flat yoke type DC machine
AssigneeAsmo Co., Ltd.
InventorToshiyasu Ishizuka
Life of this patent
Estimating the term…
Abstract
A DC motor including a rotatable armature, a pair of permanent magnets functioning as magnetic stator poles, and a flat yoke having a pair of opposed arcuate sections and a pair of opposed flat sections, for receiving the armature. Each of the arcuate sections is formed with a slit extending parallel to the rotational axis of the armature to increase the magnetic reluctance. The magnetic reluctance against a magnetic flux generated by the cross magnetomotive force is increased to reduce the armature reaction by the slits.
Claims7
A DC machine comprising:
- a flat yoke having a pair of arcuate sections and a pair of flat sections that define an inner periphery of said yoke;
- magnetic stator poles provided on the inner periphery of said flat yoke;
- an armature supported in said flat yoke for rotation about a rotational axis wherein said armature has a core, said core having a longitudinal thickness parallel to said rotational axis;
- and
- magnetic reluctance means located in said yoke for increasing a reluctance of a magnetic circuit through which passes a magnetic flux generated by a cross magnetomotive force, said magnetic reluctance means being located in each of said arcuate sections of said flat yoke adjacent said magnetic stator poles.
2 more elements
Dependencies are inferred from the claim text.