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US 4,782,254 AGranted
Direct-current dynamo electric machine, and method of manufacture
AssigneeRobert Bosch GmbH
InventorsHelmut Kreuzer, Klaus-Peter Meier
Life of this patent
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Abstract
The commutating poles of vehicular-type d-c motors, for example for trolley buses or trolley cars, are made by winding, on edge, a copper strip, permitting the wound copper strip to resiliently, spring-like expand so that the individual spiral loops thereof will be slightly spaced from each other, and then exposing the copper strip in a fluidized bed to an insulating powder, for example polyethylene or polyurethane, which is subsequently cured in a hardening or sintering process.
Claims4
Direct-current dynamo electric machine, particularly vehicular-type motor, having
- at least two commutating poles (4) and a commutating pole winding (5) on each one of the commutating poles, wherein each commutating pole (4) is made by the steps of
- winding a strip of conductive material (6), having essentially rectangular cross-sectional configuration, on edge,
- permitting the thus-formed edge-wound winding to resiliently expand to form a spiral winding loop having major surfaces facing one another,
- exposing said expanded spaced spiral winding loops to a fluidized bed in which a powder, comprising a curable, hardenable insulating material, is suspended, said powder precipitating in the fluidized bed on said expanded winding loops,
- hardening and curing said powder to form a uniform coalesced insulating coating on the conductive material (6) forming the commutating pole winding, and
- mounting the thus-insulated edge-wound winding on a commutating pole core (4).
3 more elements
Dependencies are inferred from the claim text.