John J Hurst

US Patent:

8373529, Feb 12, 2013

Filed:

Jan 29, 2010

Appl. No.:

12/657932

Inventors:

John Shirley Hurst - Indian Trail NC, US
Jurgen Klaus Vollrath - Indian Trail NC, US

Assignee:

Hexaformer AB - Upplands Väsby

International Classification:

H01F 30/12
H01F 27/24

US Classification:

336 5, 336212

Abstract:

In a three phase transformer core, amorphous metal strips are wound into rings that are combined into frames and assembled to define cores with leg cross sections that have more than 4 sides to facilitate winding transformer windings onto the legs using winding tubes. The amorphous metal layers are secured relative to one another and the core made more rigid using resin, silicon steel layers included in the amorphous metal core, or by using strapping or tying devices.

US Patent:

20090273431, Nov 5, 2009

Filed:

May 2, 2008

Appl. No.:

12/151066

Inventors:

John Shirley Hurst - Indian Trail NC, US

International Classification:

H01F 27/24
H01F 41/02

US Classification:

336216, 336233, 29607

Abstract:

In a continuous flux path transformer core, at least part of the core is implemented in non-grain oriented steel.

US Patent:

20160020020, Jan 21, 2016

Filed:

Jun 18, 2015

Appl. No.:

14/743635

Inventors:

Keith D. Earhart - Waxhaw NC, US
John S. Hurst - Monroe NC, US

International Classification:

H01F 41/02

Abstract:

In a single phase transformer core and transformer, thin-strip metal is wound into multiple rings of different widths and arranged to define a ring-like structure having a stepped, substantially circular cross-section without any cuts or gaps in the magnetic path, or the core is wound from a tapered strip that is configured to define a substantially circular cross-section when wound, while in a three phase transformer core and transformer two inner frames, each made of one or more wound rings are arranged side-by-side and an outer frame of one or more rings is wound around the two inner frames, the core being covered with epoxy prior to winding coils on it.

US Patent:

20140197144, Jul 17, 2014

Filed:

Jan 14, 2013

Appl. No.:

13/694876

Inventors:

Keith D. Earhart - Waxhaw NC, US
John S. Hurst - Indian Trail NC, US

International Classification:

B23K 26/38

US Classification:

21912172, 21912167

Abstract:

In a method and system for slitting thin strip magnetic steel such as transformer core material, a laser is mounted above the material and the material is wound from a pay-out reel to one or more take-up reels.

US Patent:

20140111297, Apr 24, 2014

Filed:

Oct 18, 2012

Appl. No.:

13/573986

Inventors:

Keith D. Earhart - Waxhaw NC, US
John S. Hurst - Indian Trail NC, US

International Classification:

H01F 27/25
H01F 41/02
H01F 41/06

US Classification:

336212, 29605, 242434

Abstract:

In a transformer core and transformer, a wound transformer core is formed from magnetic steel strips that are wound into multiple rings of different widths and arranged to define a ring-like structure having a stepped, substantially circular cross-section without any cuts or gaps in the magnetic path, or the core is wound from one or more tapered strips that are wound to define a cross-section that is circular, oval, egg-shaped, or square-shaped with truncated corners.

Author:

John Hurst

ISBN #:

0060951168

Author:

John Hurst

ISBN #:

0207140502

Author:

John Hurst

ISBN #:

0207148066

Author:

John Hurst

ISBN #:

0300049781

Author:

John Hurst

ISBN #:

0713461144

Author:

John Hurst

ISBN #:

0732919398

Author:

John Hurst

ISBN #:

0957801807

Author:

John Hurst

ISBN #:

0957801815