Slot sealing material, slot seal and method for producing a slot seal

Patent metadata

Field	Value
Publication number	US-10050488-B2
Application number	US-201415025070-A
Country	US
Kind code	B2
Filing date	Sep 15, 2014
Priority date	Sep 27, 2013
Publication date	Aug 14, 2018
Grant date	Aug 14, 2018

Abstract

The invention relates to a slot sealing material (7) for an electric machine, which for accommodating an electric conductor arrangement (3) comprises at least one slot (2) having a slot opening (5). Said slot sealing material contains a magnetic filler, especially a soft-magnetic filler, and a reaction resin mixture comprising at least one resin component and a curing agent component. To improve the temperature resistance and mechanical strength of the slot sealing material, a dianhydride is used as curing agent component.

First claim

What is claimed is:

1. A slot sealing material for a slot of an electric machine to accommodate an electric conductor arrangement, said slot sealing material comprising:
a magnetic filler;
a reaction resin mixture comprising at least a resin component and a curing agent component, said curing agent component containing a dianhydride; and
a zeolith as a desiccant.

2. The slot sealing material of claim 1 , wherein the magnetic filler is a soft-magnetic filler.

3. The slot sealing material of claim 1 , wherein the dianhydride is at least one composition selected from the group consisting of 3,3′,4,4′-benzophenonetetracarboxylic dianhydride (CAS 2421-28-5), pyromellitic dianhydride (CAS 89-32-7), and 3,3′,4,4′-biphenyl tetracarboxylic dianhydride (CAS 2420-87-3).

4. The slot sealing material of claim 1 , wherein the curing agent component is an epoxy resin.

5. The slot sealing material of claim 1 , further comprising organic and/or inorganic nanoparticles in order to improve a flow behavior of the reaction resin mixture and an impact resistance.

6. The slot sealing material of claim 1 , having a glass transition temperature equal to or greater than 200° C.

7. The slot sealing material of claim 1 , wherein the magnetic filler is contained at a proportion of at least 85% by weight.

8. The slot sealing material of claim 1 , wherein the magnetic filler is present in the form of bimodal to multimodal particle size distributions.

9. The slot sealing material of claim 1 , further comprising fibrous fillers having a fiber length of between 50 μm and 10000 μm.

10. The slot sealing material of claim 1 , further comprising fibrous fillers having a fiber length of between 100 μm and 3000 μm.

11. A slot seal for sealing a slot in an electric machine, said slot seal comprising a slot sealing material comprising a magnetic filler, a reaction resin mixture comprising at least a resin component and a curing agent component, said curing agent component containing a dianhydride, and a zeolith as a desiccant.

12. The slot seal of claim 11 , wherein the magnetic filler is a soft-magnetic filler.

13. The slot seal of claim 11 , wherein the dianhydride is at least one composition selected from the group consisting of 3,3′,4,4′-benzophenonetetracarboxylic dianhydride (CAS 2421-28-5), pyromellitic dianhydride (CAS 89-32-7), and 3,3′,4,4′-biphenyl tetracarboxylic dianhydride (CAS 2420-87-3).

14. The slot seal of claim 11 , wherein the curing agent component is an epoxy resin.

15. The slot seal of claim 11 , wherein the slot sealing material comprises organic and/or inorganic nanoparticles in order to improve a flow behavior of the reaction resin mixture and an impact resistance.

16. The slot seal of claim 11 , having a glass transition temperature equal to or greater than 200° C.

17. The slot seal of claim 11 , wherein the magnetic filler is contained at a proportion of at least 85% by weight.

18. The slot seal of claim 11 , wherein the magnetic filler is present in the form of bimodal to multimodal particle size distributions.

19. The slot seal of claim 11 , wherein the slot sealing material comprises fibrous fillers having a fiber length of between 50 μm and 10000 μm.

20. The slot seal of claim 11 , wherein the slot sealing material comprises fibrous fillers having a fiber length of between 100 μm and 3000 μm.

21. A method, comprising:
mixing at least one resin component and a curing agent component containing a dianhydride to form a reaction resin mixture;
combining the reaction resin mixture with a magnetic filler, and a zeolith as a desiccant to produce a slot sealing material;
placing an electric conductor arrangement in a slot of an electric machine; and
sealing a slot opening of the slot by placing the slot sealing material into the slot.

22. The method of claim 21 , further comprising heat-treating the slot sealing material, after being placed into the slot, at a temperature of 70° C. to 250° C.

23. The method of claim 21 , wherein the magnetic filler is a soft magnetic filler.

24. The method of claim 21 , further comprising heat-treating the slot sealing material, after being placed into the slot, at a temperature of 120° C. to 160° C.

Assignees

• Siemens Ag

Inventors

• Huber Juergen
• Klaussner Bernhard
• Schirm Dieter

Classifications

• H02K3/493 Primary

  magnetic · CPC title

• C08K3/34

  Silicon-containing compounds · CPC title

• C08K7/02

  Fibres or whiskers · CPC title

• C08K3/08

  Metals · CPC title

• H02K3/30

  Windings characterised by the insulating material · CPC title