BANDED TRANSFORMER CORES

• US 3,792,399 A
• Filed: 08/28/1972
• Issued: 02/12/1974
• Est. Priority Date: 08/28/1972
• Status: Expired due to Term

• Current Assignee: Colonel William T. Mclyman
• Original Assignee: Colonel William T. Mclyman
• Inventors: McLyman, Colonel William T.
• Primary Examiner(s): Kozma, Thomas J.
• Application Number:
  US05/284,245
• Time in Patent Office: 533 Days
• Field of Search: 336/210 24/286,2S,20,256,257 100/8 310/217
• US Class Current: 336/210
• CPC Class Codes: H01F 27/263 Fastening parts of the core together
• CPC Class Codes: H01F 41/0206 Manufacturing of magnetic cores by mechanical means magnetic cores per se H01F27/24
• CPC Class Codes: Y10S 174/25 Transformer

Abstract

A banded transformer core formed by positioning a pair of mated, similar core halves on a supporting pedestal, encircling the core halves with a strap, selectively applying tension thereto, whereby a compressive force is applied about the periphery of the core for reducing the innate air gap between the core halves, and welding the strap at a cruciform joint. A d.c. magnetic field is employed in supporting the core halves during initial phases of the banding operation, while an a.c. magnetic field subsequently is employed for detecting dimension changes occurring in the air gaps as tension is applied to the strap.

Claims

1. A banded tranformer core comprising:

A. a pair of similar core halves of a selected configuration disposed in coplanar relation with the ends thereof being abutted to form a core of a closed-loop configuration;

B. an endless strap encircling said core and applying a compressive force of a predetermined magnitude to the periphery of the core, said strap having means defining along opposite edges thereof a pair of longitudinally spaced, outwardly directed notches disposed in mutually-received relation defining a cruciform joint; and

C. means adjacent to said joint uniting said strap.

2. The core of claim 1 wherein said means uniting said strap includes means defining a weld.

3. The core of claim 1 wherein each of said core halves includes an intermediate segment, and the intermediate segments of said pair of core halves are oriented in diametric opposition.

4. The core of claim 3 wherein each intermediate segment terminAtes in a pair of mutually spaced linear segments, whereby said core conforms to an oblong configuration having a pair of mutually spaced linear segments arranged in substantial parallelism.

5. The core of claim 3 wherein each intermediate segment is of an arcuate configuration and said core further comprises a spacer of an arcuate configuration interposed between said strap and the adjacent surface of each of said intermediate segments.

6. A banded transformer core of an oblong configuration comprising:

A. a pair of mated core halves, each core half being shaped to conform to a U-shaped configuration having a pair of linear end segments arranged in substantial parallelism and an intermediate segment of an arcuate configuration joining said pair of end segments, each of said end segments including a substantially planar face disposed in an abutted contiguous engagement with an adjacent face of an end segment; and

B. a continuous, tensioned strap encircling said core wherein said strap is united at a cruciform joint including means defining a pair of oppositely directed, mutually received openings formed in said strap, and a weld securing over-lapped portions of said strap, one to the other.