Electrical commutators and slip-rings
AssigneeNational Research Development Corporation
InventorJames John Bates
Life of this patent
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Abstract
A commutator or slip-ring has a contact face formed of at least two dissimilar electrically conductive materials which have different values of electrical resistance. The two materials each occupy different discrete areas with a brush bearing on both areas simultaneously. According to a further feature a commutator comprises pairs of segments of alternately high resistance and low resistance mounted in a machine which is arranged to rotate so that brushes bear firstly on a low resistance segment and then on a high resistance segment.
Claims12
An electrical machine including a commutator and electrical contact brushes bearing thereon, said commutator being movable with respect to the brushes and comprising a plurality of pairs of interconnected segments, said pairs being separated from one another by electrical insulation and individual segments of a pair having alternately low contact resistance and high contact resistance, said segments being positioned to enable the brush to contact the individual segments of a pair in sequence whereby the brush first contacts a low resistance segment and then a high resistance segment.
A sliding electrical contact member having a contact face formed of at least two dissimilar electrically conductive materials which have different values of electrical resistance each of which materials occupies a different discrete area of the contact face.
An electrical commutator comprising pairs of segments connected together, the individual segments of a pair having alternately low contact resistance and high contact resistance and the segments positioned to enable a brush to contact the individual segments of a pair in sequence.
Dependencies are inferred from the claim text.