Plural brush DC machine and commutator assembly
AssigneeUnion Carbide Corporation
InventorAugust Frederick Manz
Life of this patent
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Abstract
In a direct current machine having plural brushes arranged for sliding engagement over the surface of the commutator assembly along separate paths; wherein the commutator assembly comprises a multiple number of commutator bars with each bar having a current transfer surface divided into conducting and nonconducting sections, each section being located in one of the separate paths, and with the sections of adjacent commutator bars so arranged to provide a checkerboard pattern of conducting and nonconducting sections over the commutator assembly surface. The brushes are interconnected to the machine load through a predetermined circuit network which controls the short circuit current.
Claims7
In a direct current machine comprising:
- a field structure;
- an armature adapted for rotation within said field structure and having an armature winding consisting of a plurality of armature coils;
- a single commutator mounted for rotation with said armature and divided into a multiple number of commutator bars each insulated from one another;
- said armature coils being electrically coupled to said commutator bars;
- and at least two commutating brush sets arranged for relative sliding engagement against the current transfer surface of each commutator bar along separate paths respectively, the improvement comprising:
- wherein the current transfer surface of each commutator bar includes at least one conducting section and one nonconducting section respectively with each section lying in a separate path and with the abutting sections of adjacent commutator bars arranged so as to form a checkerboard pattern of conducting and nonconducting sections along the separate paths traversed by each brush set;
- and circuit means for electrically coupling said brush sets to one another.
Dependencies are inferred from the claim text.