Drum commutator and method for producing the same
First Claim
1. A method for producing a drum commutator comprising a barrel-shaped support body (1) made of insulating compression-molding material, a plurality of metal conductor segments (3, 3′
- ) and an equal number of carbon segments (4), which are joined to the conductor segments (3, 3′
) in electrically conductive relationship, comprising the following steps;
producing a metal conductor blank comprising a plurality of conductor segments, each two of which adjacent to one another are joined to one another via a bridge part (20), the distance from the radial inside faces of the bridge parts (20) to the commutator axis (2) corresponding substantially to the distance from the radial outside faces of the conductor segments (3, 3′
) to the commutator axis (2);
producing a carbon shell with a substantially regular cylindrical outside face (26), at least the radial inside face and one axial end face of the carbon shell being metallized;
joining the conductor blank together with the carbon shell in the axial direction to form electrically conductive contact zones (17) between the conductor segments (3, 3′
) and the metallized end face of the carbon shell;
injection molding of a support body (1) made of insulating compression-molding material onto the composite part comprising the conductor blank and the carbon shell in an injection-molding die, the metallized radial inside face of the carbon shell being covered with compression-molding material;
removing the bridge parts (20) with formation of an annular, closed, substantially regular cylindrical surface (19) with alternating zones of compression-molding material and metal;
forming the carbon segments (4) by incising the carbon shell with axial cuts (16) extending in radial direction as far as the support body (1) and running in axial planes disposed between each two conductor segments (3, 3′
), the annular, closed, substantially regular cylindrical surface (19) with alternating zones of compression-molding material and metal being at least partly preserved.
1 Assignment
0 Petitions
Accused Products
Abstract
The invention relates to a drum commutator comprising a cylinder-shaped support base (1) produced from an insulating pressed material, a plurality of metal conductor segments (3) with terminal lugs (8) disposed thereon and an equal amount of carbon segments (4) that are electrically connected to the conductor segments (3). The drum commutator, adjacent to the terminal lugs (8), further comprises an annular, closed substantially regularly cylindrical surface (19) with alternating pressed material zones and metal zones, as well as a metallized inner surface of the carbon segments (4) that communicates with the support base (1). When producing such a drum commutator, the conductor segments (3) are preferably first connected to a conductor blank via bridge portions which are removed once the conductor blank has been assembled with a carbon cylinder and the support base has been injection-molded onto it.
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Citations
20 Claims
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1. A method for producing a drum commutator comprising a barrel-shaped support body (1) made of insulating compression-molding material, a plurality of metal conductor segments (3, 3′
- ) and an equal number of carbon segments (4), which are joined to the conductor segments (3, 3′
) in electrically conductive relationship, comprising the following steps;producing a metal conductor blank comprising a plurality of conductor segments, each two of which adjacent to one another are joined to one another via a bridge part (20), the distance from the radial inside faces of the bridge parts (20) to the commutator axis (2) corresponding substantially to the distance from the radial outside faces of the conductor segments (3, 3′
) to the commutator axis (2);
producing a carbon shell with a substantially regular cylindrical outside face (26), at least the radial inside face and one axial end face of the carbon shell being metallized;
joining the conductor blank together with the carbon shell in the axial direction to form electrically conductive contact zones (17) between the conductor segments (3, 3′
) and the metallized end face of the carbon shell;
injection molding of a support body (1) made of insulating compression-molding material onto the composite part comprising the conductor blank and the carbon shell in an injection-molding die, the metallized radial inside face of the carbon shell being covered with compression-molding material;
removing the bridge parts (20) with formation of an annular, closed, substantially regular cylindrical surface (19) with alternating zones of compression-molding material and metal;
forming the carbon segments (4) by incising the carbon shell with axial cuts (16) extending in radial direction as far as the support body (1) and running in axial planes disposed between each two conductor segments (3, 3′
), the annular, closed, substantially regular cylindrical surface (19) with alternating zones of compression-molding material and metal being at least partly preserved. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- ) and an equal number of carbon segments (4), which are joined to the conductor segments (3, 3′
-
9. A drum commutator for an electrical machine, comprising a barrel-shaped support body (1) made of insulating compression-molding material, a plurality of metal conductor segments (3, 3′
- ) with terminal lugs (8) disposed thereon, and an equal number of carbon segments (4), which are joined to the conductor segments (3, 3′
) in electrically conductive relationship, characterized by an annular, closed, substantially regular cylindrical surface (19) disposed adjacent to the terminal lugs (8) and comprising alternating zones of compression-molding material and metal, as well as by a metallized radial inner surface that belongs to the carbon segments (4) and is joined to the support body. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
- ) with terminal lugs (8) disposed thereon, and an equal number of carbon segments (4), which are joined to the conductor segments (3, 3′
Specification