Dynamoelectric machine core and coil assembly

• US 4,008,409 A
• Filed: 04/09/1975
• Issued: 02/15/1977
• Est. Priority Date: 04/09/1975
• Status: Expired due to Term

• Current Assignee: General Electric Company
• Original Assignee: General Electric Company
• Inventors: Rhudy, Ralph G., Casanova, Hans H.
• Primary Examiner(s): Skudy, R.
• Application Number:
  US05/566,454
• Time in Patent Office: 678 Days
• Field of Search: 310/179, 310/180, 310/45, 310/184, 310/260, 310/187, 310/270, 310/189, 310/196, 310/194, 310/214, 310/215, 427/127, 428/244, 428/266, 428/268, 336/84 C, 336/205, 336/84, 174/117, 174/117 FF, 174/117 F, 174/120, 174/110, 174/113, 174/34, 174/120 SC, 174/127
• US Class Current: 310/45
• CPC Class Codes: H02K 11/40 Structural association with grounding devices
• CPC Class Codes: H02K 3/32 Windings characterised by the shape, form or construction of the insulation
• CPC Class Codes: H02K 3/40 for high voltage, e.g. affording protection against corona discharges
• CPC Class Codes: H02K 5/225 Terminal boxes or connection arrangements specially adapted for submersible motors H02K5/132
• CPC Class Codes: Y10S 174/20 Stator
• CPC Class Codes: Y10S 174/28 Plural semiconductive layers
• CPC Class Codes: Y10S 174/30 having insulation with a particular dimension or geometry

Abstract

A dynamoelectric machine core and coil assembly characterized by having a separately insertable conformable side filler, such as resin impregnated fiber glass provided with a plurality of ridges of an electrically semi-conductive, pressure-deformable elastomer bonded to one side thereof. In the assembly the conformable side filler is compressed between the side of a coil-receiving laminated core slot and the relatively smooth sides of coil windings mounted in the slot. As thus compressed, the side filler forms a good thermally conductive path between the somewhat irregular coil sides and the core to thereby prevent undesirable temperature rises. The side fillers also prevent insulation-destroying vibration of the coils in the slots, and due to the semi-conductive nature of the side fillers, they prevent the formation of corona across any voids that might exist between the sides of the coil insulation and the sides of the coil-receiving slots.

Claims

1. A dynamoelectric machine core and coil winding assembly comprising a core stack of magnetic metal laminations formed with coil-receiving slots therein, an electrical winding of interconnected coils having their sides disposed, respectively, in said slots and having their end turns extending beyond the ends of the core stack, a rigid coating of insulating material disposed around each coil side to insulate the coils from the core stack, in combination with generally flat mats of semi-conducting material each having a plurality of ridges of electrically semi-conductive, pressure-deformable room temperature vulcanizing silicone rubber bonded to one side thereof, said rubber bonded to the mats comprising 50 to 80 percent by weight silicone rubber loaded with 20 to 30 percent carbon powdered material, said mats being positioned respectively, one in each of said slots with the rubber coated side of each mat compressed against the side of a slot by the coil side mounted therein.

2. An assembly as defined in claim 1 wherein each of said mats is substantially as wide as the depth of the slot in which it is disposed.

3. An assembly as defined in claim 2 wherein each of said mats is formed of fiber glass having a resin coating cured thereon, said resin coating being filled with a conducting material to make the coating electrically semi-conductive.

4. An assembly as defined in claim 2 wherein each mat is in the range of 10 to 20 mils thick, and each ridge bonded to said mats is generally triangular in cross-section with the maximum vertical axis of said triangular cross-sections being in the range of 30 to 70 mils in height.

5. An assembly as defined in claim 2 wherein the ends of each of said mats are spaced, respectively, between 1 and 5 inches from the ends of said slot.

6. An assembly as defined in claim 4 wherein the room temperature vulcanizing rubber bonded to the mats comprises 50 to 80% by weight silicone rubber loaded with 20 to 30% by weight carbon powder.

7. An assembly as defined in claim 4 wherein said ridges are substantially parallel and extend the full length of the mat on which they are mounted, there being approximately 20 ridges per inch of width on each mat.