Manufacture of magnetic cores from blanks of magnetically permeable sheet material

• US 4,747,207 A
• Filed: 12/01/1986
• Issued: 05/31/1988
• Est. Priority Date: 12/01/1986
• Status: Expired due to Term

• Current Assignee: Schonstedt Instrument Company
• Original Assignee: Schonstedt Instrument Company
• Inventors: Schonstedt, Erick O., Hamzezadeh, Mohammed M.
• Primary Examiner(s): Hall, Carl E.
• Application Number:
  US06/936,629
• Time in Patent Office: 547 Days
• Field of Search: 29/605, 29/607, 29/609, 29/418, 336/213, 336/234, 242/7.03, 242/7.07, 242/7.11
• US Class Current: 29/605
• CPC Class Codes: H01F 41/0213 Manufacturing of magnetic circuits made from strip(s) or ribbon(s) magnetic cores made by winding a ribbon H01F27/25
• CPC Class Codes: Y10T 29/49071 by winding or coiling
• CPC Class Codes: Y10T 29/49078 Laminated
• CPC Class Codes: Y10T 29/49799 Providing transitory integral holding or handling portion

Abstract

Magnetic cores are manufactured from blanks of magnetically permeable sheet material that have core preforms including strip elements that are partially separated from adjacent portions of the blank. Stabilizer strip elements are provided at opposite sides of the preform and are partially separated from adjacent portions of the blank. A tube is attached to one end of the blank and a weight to an opposite end of the blank. After removal of portions of the blank adjacent to the strip elements, the strip elements are wound upon the tube while tension is applied to the strip elements by virtue of the weight. After the winding, the strip elements of the core preform define a core configuration, and the remainder of the blank is removed.

Claims

1. A method of making a magnetic core, that comprises the steps of forming from magnetically permeable sheet material a blank having a magnetic core preform portion including strip elements of said material that are partially separated from adjacent portions of the blank, attaching one end of the blank to an elongated support, attaching a weight to an opposite end of the blank, winding the preform portion and other, stabilizing portions of the blank upon the support, while applying tension to the wound portions of the blank by virtue of the weight, until the preform portion and stabilizing portions are wrapped about the support, and maintaining the wound configuration of the perform portion of the blank while removing the remainder of the blank therefrom.

2. A method in accordance with claim 1, wherein the attaching step comprises threading the support through holes of the blank that are spaced along said one end of the blank.

3. A method in accordance with claim 1, wherein prior to the winding step an end of the preform portion is affixed to the support.

4. A method in accordance with claim 1, wherein said stabilizing portions include stabilizer strip elements at opposite sides of the strip elements of the preform portion and partially separated from adjacent portions of the blank, said stabilizer strip elements extending between said one end and said opposite end of the blank, and wherein prior to the winding step poritons of the blank are removed so as to leave only said strip elements extending between said one end and said opposite end of the blank.

5. A method in accordance with claim 4, wherein said blank is formed so that said strip elements of said perform portion define an X-configuration having a length extending between said one end and said opposite end of the blank and so that the stabilizer strip elements define with the strip elements of the X-configuration a pair of generally diamond configurations, and wherein prior to said winding step corresponding portions of said diamond configurations adjacent to said one end of the blank are affixed to said support.

6. A method in accordance with claim 1, wherein said support has a length dimension substantially greater than the corresponding dimension of the blank, and wherein after said wound configuration is maintained portions of the support that extend beyond said wound configuration are removed.