Core for an electrical induction device
A core for an electric induction device includes a multiplicity of magnetizable metal sheets which form a stack of metal sheets resting on each other. Spacers that are each disposed between two metal sheets form at least one cooling channel which can be subjected to a greater thermal load and at the same time allows improved cooling. Said spacers are made, at least in part, of metal.
1. A core for an electrical induction device, the core comprising:
a multiplicity of magnetizable metal sheets forming a stack of metal sheets resting on each other; and
spacers being at least partially metallic and configured a flat bars, each of said spacers being disposed between two respective metal sheets, said spacers forming at least one cooling channel, and said spacers each having a side facing a respective metal sheet and an electrically insulating insulation layer disposed on said side.
2. The core according to claim 1 , wherein said spacers are at least partially formed of a magnetizable material, and said magnetizable material is formed of layered magnetizable metal sheets.
3. The core according to claim 2 , wherein said magnetizable material assumes a preferred direction of magnetization.
4. The core according to claim 3 , which further comprises:
a limb and a yoke formed by said metal sheets;
a joint formed between said metal sheets of said limb and said yoke; and
said preferred direction of magnetization and said joint forming an angle between 70 degrees and 110 degrees.
5. The core according to claim 1 , wherein said spacers are fitted with at least one spring element.
6. The core according to claim 1 , wherein said spacers are formed of an expanded metal mesh or a wire mesh.
7. The core according to claim 6 , wherein said expanded metal mesh or wire mesh is secured in an elastically bent position in said stack of metal sheets.
8. The core according to claim 1 , wherein said spacers have a fixing section projecting out of the core.
9. The core according to claim 8 , wherein said fixing section forms a hook or an eye for attachment or lifting of the core.
10. The core according to claim 8 , wherein said fixing section forms a mounting bracket for attachment to the electrical induction device.
11. The core according to claim 1 , wherein said spacers are disposed in mutually parallel first and second planes as seen in a cross-sectional view, and said spacers in said first plane are configured in an offset configuration in relation to said spacers in said second plane.
12. The core according to claim 1 , wherein said spacers are at least partially configured as hollow sections.
13. The core according to claim 1 , wherein said spacers are formed of a multiplicity of mutually spaced-apart spacer segments being interconnected by connecting webs, said spacer segments have a height, and said connecting webs have a height corresponding to at most 50% of said height of said spacer segments.
14. The core according to claim 2 , wherein said spacers include an inner region formed of a non-magnetic metallic material.
15. The core according to claim 3 , wherein said spacers include an inner region formed of a non-magnetic metallic material.
16. The core according to claim 4 , wherein said spacers include an inner region formed of a non-magnetic metallic material.
17. The core according to claim 8 , which further comprises:
an upper yoke having a lower edge and a side facing a high voltage winding when installed in a transformer;
said upper yoke having spacers on said side being extended beyond said lower edge and having a region of overlap with said yoke forming an arch over said winding partially covering said yoke.
18. The core according to claim 9 , which further comprises:
an upper yoke having a lower edge and a side facing a high voltage winding when installed in a transformer;
said upper yoke having spacers on said side being extended beyond said lower edge and having a region of overlap with said yoke forming an arch over said winding partially covering said yoke.
19. The core according to claim 10 , which further comprises:
an upper yoke having a lower edge and a side facing a high voltage winding when installed in a transformer;
said upper yoke having spacers on said side being extended beyond said lower edge and having a region of overlap with said yoke forming an arch over said winding partially covering said yoke.