Stator winding for an electric machine

• US 4,347,454 A
• Filed: 08/16/1979
• Issued: 08/31/1982
• Est. Priority Date: 08/17/1978
• Status: Expired due to Term

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Nagel, Gunter, Gellert, Klaus, Pollmeier, Franz J.
• Primary Examiner(s): Skudy, R.
• Application Number:
  US06/067,145
• Time in Patent Office: 1,111 Days
• Field of Search: 310/193, 310/194, 310/214, 310/45, 310/208, 310/179, 310/180, 310/271, 310/198, 310/91, 310/254, 310/216, 310/196, 310/189, 310/192, 310/42, 310/259, 339/106, 174/135, 336/197, 361/2, 361/112, 361/212
• US Class Current: 310/193
• CPC Class Codes: H02K 15/0012 Manufacturing cage rotors
• CPC Class Codes: H02K 3/32 Windings characterised by the shape, form or construction of the insulation
• CPC Class Codes: H02K 3/48 in slots
• CPC Class Codes: Y10S 174/20 Stator
• CPC Class Codes: Y10S 174/22 Winding per se

Abstract

The bars or coils of the stator winding of an electric machine are provided, in the region of the slots, with one or more additional wrappings having a larger cross-section than the slot. These wrappings are set in corresponding recesses in the laminated stack, whereby the bars are made secure in the axial direction.

Claims

1. A stator winding assembly for an electric machine comprising:

a stack of stator laminations formed with at least one slot having a given cross-section along its length, the cross-section of the slot being enlarged at at least one point along the slot to provide at least one recess in the laminations, each such recess surrounding the slot and bounded on its sides and bottom by the lamination stack; and

a winding inserted in the slot, the winding comprising at least one insulated conductor having a protective outer corona coating, and at least one portion of the winding, at at least one point corresponding to the position of a recess having an enlarged cross-section comprising a wrapping of insulating tape adapted to engage and lock in the recess to secure the winding against motion in the axial directon.

2. A stator winding assembly in accordance with claim 1 in which there is only one recess and the recess is located in the center of the stack of laminations, and in which the portion of enlarged cross-section is located centrally on the winding.