End turn insulation for a dynamoelectric machine

• US 4,588,916 A
• Filed: 01/28/1985
• Issued: 05/13/1986
• Est. Priority Date: 01/28/1985
• Status: Expired due to Fees

• Current Assignee: General Motors Corporation (General Motors Company)
• Original Assignee: General Motors Corporation (General Motors Company)
• Inventors: Lis, Robert J.
• Primary Examiner(s): Budd, Mark O.
• Application Number:
  US06/695,272
• Time in Patent Office: 470 Days
• Field of Search: 310/260, 310/270, 310/194, 310/208, 310/215, 310/179
• US Class Current: 310/260
• CPC Class Codes: H02K 3/38 around winding heads, equalising connectors, or connections thereto
• CPC Class Codes: Y10S 174/20 Stator

Abstract

A paper separator for insulating the stator winding end turns of a dynamoelectric machine at the point of their overlap. The paper is formed with a fold line and cut so that when the paper is properly folded and inserted between overlapping end turns, and a tie cord is tightened around the end turn bundle, the cord seats in a separator notch and bends a separator tab into engagement with one of the end turns to protect the winding insulation from damage due to contact with the cord.

Claims

1. For a dynamoelectric machine having a slotted stator, a plurality of insulated stator windings supported by the stator slots such that winding end turns extending exteriorly of the stator from adjacent stator slots overlap before returning to different stator slots, such overlapping end turns being tied together with a cord at the point of overlap to prevent relative movement therebetween during operation of the machine, and winding separators inserted between overlapping end turns prior to the tying thereof for increasing the insulation therebetween, the improvement wherein:

the winding separator is formed of flat insulative material comprising a main body defined by a generally straight stator facing edge and a curved edge generally resembling the contour of a stator winding end turn, and a tab extending in the plane of said main body from the stator facing edge thereof, said tab being formed in part by a portion of said main body such that folding said tab back onto said main body along the stator facing edge thereof prior to insertion of the winding separator between the winding end turns operates to define a notch in said stator facing edge which is overlapped by a complementary portion of said tab, so that when the cord is tied around the winding end turns, it seats in the notch of the inserted winding separator and thereby bends the complementary tab portion into engagement with one of the overlapping winding end turns so that the complementary tab portion is positioned between the cord and the end turn, thereby providing increased insulation between the overlapping end turns and preventing the winding insulation from becoming damaged by contact with the cord.

2. A winding separator of the flat insulative type for insertion between the overlapping end turns of a dynamoelectric machine wherein the end turns are then bound together by a tie cord to prevent relative movement therebetween, the separator including a main portion and a dependent portion having an interface therebetween defined by a fold line and a generally V-shaped cut extending from one end of the fold line into the main portion so that the dependent portion may be folded along the fold line against the main portion to define a generally V-shaped notch in the main portion and a complementary tab in the dependent portion, and the separator may be inserted between two overlapping end turns such that one of the end turns is positioned adjacent the dependent portion in alignment with the edge of the notch in the main portion extending from the fold line, and the tie cord may be assembled such that the cord seats in the notch of the main portion and bends the tab of the dependent portion against the adjacent end turn as the cord is tightened thereby to position the tab between the tie cord and the end turn for providing increased insulation between the overlapping end turns and protecting the end turn insulation from damage caused by the tightened cord.

3. A winding separator of the flat insulative type for insertion between insulated stator winding end turns of a dynamoelectric machine at the point of their overlap wherein the overlapped end turns are then bound together by a tie cord to prevent relative movement therebetween, the separator including a main portion and a dependent portion having an interface therebetween defined by a fold line and a generally V-shaped cut extending from one end of the fold line into the main portion so that the dependent portion may be folded along the fold line in a radially inward direction with respect to the machine axis against the radially inward face of the main portion to define a generally V-shaped notch in the main portion and a complementary tab in the dependent portion, and the separator may be inserted between two overlapping end turns such that the radially inward end turn is positioned adjacent the dependent portion in alignment with the edge of the notch in the main portion extending from the fold line, and the tie cord may be fed between the separator notch and the machine stator in a radially outward to radially inward direction such that the cord seats in the notch of the main portion and bends the tab of the dependent portion against the radially inward end turn as the cord is tightened thereby to position the tab between the tie cord and the end turn for providing increased insulation between the overlapping end turns and protecting the end turn insulation from damage caused by the tightened cord.

4. A winding separator of the flat insulative type for insertion between the insulated stator winding end turns of a dynamoelectric machine at the point of their overlap wherein the overlapped end turns are then bound together by a tie cord to prevent relative movement therebetween, the separator including a main portion and a dependent portion having an interface therebetween defined by a fold line and a generally V-shaped cut extending from one end of the fold line into the main portion so that the dependent portion may be folded along the fold line in a radially outward direction with respect to the machine axis against the radially outward face of the main portion to define a generally V-shaped notch in the main portion and a complementary tab in the dependent portion, and the separator may be inserted between two overlapping end turns such that the radially outward end turn is positioned adjacent the dependent portion in alignment with the edge of the notch in the main portion extending from the fold line, and the tie cord may be fed between the separator notch and the machine stator in a radially inward to radially outward direction such that the cord seats in the notch of the main portion and bends the tab of the dependent portion against the radially outward end turn as the cord is tightened thereby to position the tab between the tie cord and the end turn for providing increased insulation between the overlapping end turns and protecting the end turn insulation from damage caused by the tightened cord.