Core for an electrical induction device

Patent metadata

Field	Value
Publication number	US-9941043-B2
Application number	US-201515326886-A
Country	US
Kind code	B2
Filing date	Jul 1, 2015
Priority date	Jul 16, 2014
Publication date	Apr 10, 2018
Grant date	Apr 10, 2018

Abstract

A core for an electrical induction device has a plurality of lamination stacks which are each formed by laminated sheets. The lamination stacks lie on top of each other parallel to the layer plane of the laminated sheets. At least one of the lamination stacks is segmented and has at least two partial lamination stacks, the two partial lamination stacks respectively lying opposite each other with their stack end faces standing transverse, in particular perpendicular, to the layer plane of the laminated sheets. The stack end faces of the two partial lamination stacks have a spacing between each other through which a gap is formed extending between the two partial lamination stacks perpendicular to the layer plane. The gap forms a cooling channel or at least a section of a cooling channel, the channel longitudinal extension thereof extending transversely, in particular, perpendicular to the layer plane of the laminated sheets.

First claim

The invention claimed is:

1. A core for an electrical induction device, the core comprising:
a multiplicity of lamination stacks each formed of laminated sheets, said lamination stacks lying one on the other parallel to a layer plane of said laminated sheets;
at least one of said lamination stacks being segmented and having at least two partial lamination stacks;
said two partial lamination stacks lying opposite one another with facing lamination end sides that are transverse to the layer plane of said laminated sheets,
the lamination end sides of said two partial lamination stacks having a spacing distance therebetween, forming a gap between said two partial lamination stacks that extends perpendicular to the layer plane of said laminated sheets; and
said gap forming a cooling channel, or at least a section of a cooling channel, with a longitudinal direction thereof extending transversely to the layer plane of said laminated sheets.

2. The core according to claim 1 , wherein:
said lamination end sides of said two partial lamination stacks are perpendicular to the layer plane of said laminated sheets; and
said cooling channel has a longitudinal direction extending perpendicularly to the layer plane of said laminated sheets.

3. The core according to claim 1 , wherein a width of said lamination stacks is different between certain said lamination stacks, so as to form steps between lamination stacks which lie on one another.

4. The core according to claim 3 , wherein a cross section of the core is matched to a circular cross section at least in sections owing to a formation of said steps.

5. The core according to claim 1 , wherein a number of different lamination widths in said partial lamination stacks is at most one third of a number of steps.

6. The core according to claim 1 , wherein a number of different lamination widths in said partial lamination stacks is at most three.

7. The core according to claim 1 , wherein lamination widths in said partial lamination stacks are identical.

8. The core according to claim 1 , wherein:
at least two lamination stacks which are disposed on one another have an identical number of partial lamination stacks of identical width, but are nevertheless of different width; and
in the case of the relatively wide lamination stack, at least two partial lamination stacks are separated from one another by said cooling channel or one of said cooling channels.

9. The core according to claim 1 , wherein:
the core, as viewed from an inside to an outside, alternately has a lamination stack of a first kind and a lamination stack of a second kind;
in said lamination stack of the first kind, at least two partial lamination stacks are separated from one another by a gap forming said cooling channel; and
in said lamination stack of the second kind, at least two partial lamination stacks lie on one another without a gap.

10. The core according to claim 9 , wherein:
in said lamination stack of the first kind, all of said partial lamination stacks are separated from one another by a gap; and
in said lamination stack of the second kind, all of said partial lamination stacks lie on one another without a gap.

11. The core as claimed in claim 9 , wherein at least two said lamination stacks of the first and second kind which lie on one another have an equal number of partial lamination stacks of identical width.

12. The core according to claim 1 , wherein:
said laminations are formed by a thin-walled strip material; and
each of said lamination stacks is wound from said strip material.

13. The core according to claim 12 , wherein said thin-walled strip material is an amorphous strip material.

14. The core according to claim 1 , which further comprises at least one additional cooling channel having a longitudinal direction extending parallel to the layer plane of said laminated sheets.

15. The core according to claim 1 , wherein:
said lamination stacks are bent in sections with a given bending radius, and wherein the bending radii of at least two said lamination stacks that lie on one another are selected so as to form a hollow space, in a bending region between said at least two lamination stacks;
wherein said hollow space is connected to one of said cooling channels or all of said cooling channels and is configured to enable makes it possible for a coolant to be fed into the cooling channel or cooling channels through the hollow space.

16. The core according to claim 15 , wherein said hollow space is an arcuate gap.

17. The core according to claim 1 , wherein said partial lamination stacks comprise a widest partial lamination stack and a narrowest partial lamination stack, and wherein a width of the widest partial lamination stack is an integer multiple of the narrowest partial lamination stack.

18. The core according to claim 1 , wherein:
wherein said partial lamination stacks are wound and stabilized and fixed by tensioning belts;
wherein said tensioning belts are arranged on said lamination stacks such that a position of said tensioning belts is respectively offset in relation to said tensioning belt of an adjacent said partial lamination stack and said tensioning belts are configured to form a cooling channel in a space between said partial lamination stacks.

Assignees

• Siemens Ag

Inventors

• Findeisen Joerg

Classifications

• H01F27/08 Primary

  Cooling (heat-transfer elements F28F); Ventilating (structural details of casings H01F27/02) · CPC title

• H01F3/02

  made from sheets · CPC title

• H01F27/245

  made from sheets, e.g. grain-oriented (H01F27/26 takes precedence) · CPC title

• H01F27/2455

  using bent laminations · CPC title

• H01F17/06

  with core substantially closed in itself, e.g. toroid · CPC title