Abstract A commutator in which a base member having a mounting portion of substantial axial extent and an annular planar surface axially facing the mounting portion has electrically conductive commutating segments secured to the mounting portion. Each commutating segment has a planar surface at an end thereof closely adjacent the annular planar surface, and the end planar surface is adhesively bonded to the annular planar surface by a relatively thin layer of adhesive material which is electrically conductive and has high dielectric strength. The thickness of the adhesive layer is sufficiently small that the bonds between the layer and the adjacent surfaces are substantially stressed in shear during operation of the commutator in a dynamoelectric machine.
Inventors
👤 Q Cole
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-11-06 04:09
CPC Classifications
H; H01; H01R; H01R39/00; H01R39/02; H01R39/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
26 words
A commutator as defined by claim 1 in which the thickness of said layer of adhesive material is in the range of 0.020 inch or less.
Claim 2
Dependent Claim
24 words
A commutator as defined by claim 1 in which said adhesive material is selected from the group of adhesives consisting of epoxies and polyimides.
Claim 3
Dependent Claim
49 words
A commutator as defined by claim 3 in which said mounting portion of said base member comprises a cylindrical outer surface, a layer of said adhesive material being interposed between each of said commutating segments and said cylindrical surface to adhesively bond said commutating segments to said cylindrical surface.
Claim 4
Dependent Claim
73 words
A commutator as defined by claim 4 in which said base member is formed of a material characterized by extreme rigidity and thermal stability relative to said adhesive material, the diameter of said cylindrical surface being at least one hundred times greater than the thickness of said layer of adhesive material so that the commutator substantially exhibits during operation in a dynamoelectric machine the mechanical and thermal stability characteristics of said base member.
Claim 5
Dependent Claim
52 words
A commutator as defined by claim 5 in which the diameter of said base member is at least 2.000 inches and the thickness of each of said adhesive layers between said commutating segments and, respectively, said cylindrical surface and said annular planar surface is in the range of 0.020 inch or less.
Claim 6
Dependent Claim
27 words
A commutator as defined by claim 6 further comprising spacing means disposed in said layer of adhesive material for establishing a minimum thickness of said adhesive layer.
Claim 7
Dependent Claim
31 words
A commutator as defined by claim 6 in which said base member is comprised of steel having a coating of alumina on both said annular planar surface and said cylindrical surface.