CHANNEL, SHAPED, LAMINATED, HIGH TEMPERATURE SLOT WEDGE FOR DYNAMOELECTRIC MACHINES

• US 3,735,169 A
• Filed: 04/14/1971
• Issued: 05/22/1973
• Est. Priority Date: 04/04/1971
• Status: Expired due to Term

• Current Assignee: Domenico Cipriani, Roy Leonard Balke
• Original Assignee: Domenico Cipriani, Roy Leonard Balke
• Inventors: Balke, Roy Leonard, Cipriani, Domenico
• Primary Examiner(s): Duggan, D. F.
• Application Number:
  US05/133,820
• Time in Patent Office: 769 Days
• Field of Search: 310/214,215,43
• US Class Current: 310/214
• CPC Class Codes: H02K 15/0018 Applying slot closure means in the core; Manufacture of slot closure means
• CPC Class Codes: H02K 3/487 Slot-closing devices

Abstract

A rigid, laminated, thin '"'"''"'"''"'"''"'"'slot wedge'"'"''"'"''"'"''"'"' construction is described along with the method for fabricating it from flexible, normally difficult to form plastics. The laminated wedge is channel shaped with well defined corners to provide firm seating of the wedge in the slots of a dynamoelectric machine. A rigid, laminated channel shaped slot wedge having excellent corner definition is produced from thin, flexible high temperature plastics such as '"'"''"'"''"'"''"'"'Kapton'"'"''"'"''"'"''"'"' polyimide film or '"'"''"'"''"'"''"'"'Nomex'"'"''"'"''"'"''"'"' polyamide sheets by laminating them with an adhesive which is rigid when cured. The laminate is baked and the adhesive cured while it is held in the desired channel form by a clamping fixture. This imparts the desired rigidity and long term corner definition to the wedge while yet retaining the desired high temperature qualities of the individual laminations.

Claims

1. A dynamoelectric machine including:

a. a stator core having means for defining a plurality of coil receiving slots, said slots having overhanging teeth portions partially enclosing said slots, b. insulating slot liner means positioned along the interior surfaces of said slots, c. coil windings positioned within said slots and insulated from the interior surfaces thereof by said slot liner means, d. slot wedge means for closing the top of said slot means comprising;

1. a thin, laminated, high temperature, channel shaped slot wedge having longitudinal rigidity and sharp corners positioned under said slot teeth with the corners of said channel conforming to said slot teeth to securely anchor said wedge against the teeth, said wedge partially overlapping said slot liner, 2. said slot wedge being formed of a plurality of layers of thin, high temperature, normally resilient layers of plastic, 3. a cured, rigid adhesive positioned between and securing said layers to retain the normally resilient layers in a rigid, channel shape with sharply defined corners.

2. said slot wedge being formed of a plurality of layers of thin, high temperature, normally resilient layers of plastic,

3. a cured, rigid adhesive positioned between and securing said layers to retain the normally resilient layers in a rigid, channel shape with sharply defined corners.

4. The dynamoelectric machine according to claim 2 wherein the layers of said channel shaped slot wedge comprise polyimide films.

5. The dynamoelectric machine according to claim 2 wherein the maximum thickness of the laminated slot wedge does not exceed 20 mils.

6. The dynamoelectric machine according to claim 1 wherein the layers of said laminated slot wedge are secured by an epoxylated novolac resin which is rigid when cured.

7. The dynamoelectric machine according to claim 1 wherein the layers of the laminated slot wedge are secured by a thermosetting epoxy varnish which is rigid when cured.