Bar windings for electrical machines

• US 4,308,476 A
• Filed: 11/21/1975
• Issued: 12/29/1981
• Est. Priority Date: 12/04/1974
• Status: Expired due to Term

• Current Assignee: BBC Brown Boveri & Company Limited (ABB Limited)
• Original Assignee: BBC Brown Boveri & Company Limited (ABB Limited)
• Inventors: Schuler, Roland
• Primary Examiner(s): Skudy, R.
• Application Number:
  US05/634,186
• Time in Patent Office: 2,230 Days
• Field of Search: 310/45, 310/43, 310/60 A, 310/213, 310/214, 310/215, 310/64, 310/194, 174/34, 174/117
• US Class Current: 310/45
• 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: Y10S 174/22 Winding per se

Abstract

A large electrical machine, includes bar windings composed of twisted individual conductors with irregularities formed at the narrow edges of the bar winding. The bar winding is composed of individual insulated conductors and uninsulated conductors. A synthetic mica-resin putty pressed between the conductors fills the spaces between the conductors. Electrically conductive strips covering the putty are electrically connected to the uninsulated conductors.

Claims

1. A bar-shaped winding member for electrical machines, comprising a plurality of insulated conductive strands, a plurality of uninsulated conductive strands, a synthetic mica-resin putty, an electrically conductive strip, an electrically conductive synthetic resin adhesive, said strands having lengths and being twisted along their lengths and forming an elongated structure having a length and a width as well as a thickness, the length of the structure being greater than the thickness, the thickness being greater than the width, said conductive strands forming an outer surface at the width, said conductive strands forming irregularities at the outer surface of the width, said conductive strands having the irregularities filled with said synthetic mica-resin putty and said uninsulated conductive strands being covered by said electrically conductive strip and being electrically connected to said strip by means of the electrically conductive synthetic resin adhesive, said strip including a glass-fiber reinforced synthetic material.

2. A member as in claim 1, wherein said strip includes rounded outer corners.

3. A member as in claim 1 or claim 2, wherein a plurality of said strands are solid and a plurality of said strands are hollow, said solid conductors having individual insulation.