Magnetic sheet stack, method for manufacturing a magnetic sheet stack and electric machine

Patent metadata

Field	Value
Publication number	US-12266464-B2
Application number	US-202017608562-A
Country	US
Kind code	B2
Filing date	Apr 16, 2020
Priority date	May 6, 2019
Publication date	Apr 1, 2025
Grant date	Apr 1, 2025

Abstract

Various embodiments of the teachings herein include a magnetic sheet stack for an electric machine comprising: a plurality of magnetic sheets electrically insulated from one another by being spaced apart from one another predominantly with a non-vanishing clearance; a respective set of ceramic spacers distributed between each of the plurality of magnetic sheets from an adjacent sheet in the stack; and a respective gas layer filling a gap between a predominant part of a planar extent of each of the plurality of magnetic sheets allowing a cooling fluid to be circulated between the adjacent sheets.

First claim

What is claimed is:

1. A magnetic sheet stack for an electric machine, the sheet stack comprising:
a plurality of magnetic sheets electrically insulated from one another by being spaced apart from one another predominantly with a non-vanishing clearance;
a respective set of ceramic spacers distributed between each of the plurality of magnetic sheets from an adjacent sheet in the stack; and
a respective gas layer filling a gap between a predominant part of a planar extent of each of the plurality of magnetic sheets allowing a cooling fluid to be circulated between the adjacent sheets.

2. The magnetic sheet stack as claimed in claim 1 , wherein the respective gas layer comprises air.

3. The magnetic sheet stack as claimed in claim 1 , wherein the ceramic spacers are held in a force-fit manner between adjacent sheets of the stack.

4. The magnetic sheet stack as claimed in claim 1 , wherein the spacers comprise aluminum oxide and/or zirconium oxide and/or magnesium oxide and/or yttrium oxide and/or boron nitride and/or yttrium aluminum garnet and/or silicon nitride and/or silicon dioxide.

5. The magnetic sheet stack as claimed in claim 1 , wherein spacers comprise particles of electrically insulating material.

6. The magnetic sheet stack as claimed in claim 1 , wherein the particles have a diameter of no more than 300 micrometers.

7. The magnetic sheet stack as claimed in claim 6 , wherein diameters of the particles have a size distribution which is a monomodal or at least approximately Gaussian distribution with a mean value of at least 0.5 micrometers and/or no more than 20 micrometers.

8. The magnetic sheet stack as claimed in claim 1 , wherein the particles are essentially spherical.

9. A method for manufacturing a magnetic sheet stack, the method comprising:
distributing a suspension of ceramic particles onto one or more magnetic sheets;
stacking the magnetic sheets to form the magnetic sheet stack; and
pressing the stacked magnetic sheets together.

10. The method as claimed in claim 9 , wherein distributing the suspension includes spraying and/or printing the suspension and/or dipping the magnetic sheets into the suspension.

Assignees

• Siemens Ag

Inventors

• Buschbeck Jörg
• Rieger Gotthard
• Schuh Carsten
• Soller Thomas
• Vollmer Rolf

Classifications

• H02K1/04 Primary

  characterised by the material used for insulating the magnetic circuit or parts thereof · CPC title

• H02K2213/03

  Machines characterised by numerical values, ranges, mathematical expressions or similar information · CPC title

• H02K15/02

  of stator or rotor bodies · CPC title

• H01F2027/2809

  on stacked layers · CPC title

• H01F17/0013

  with stacked layers · CPC title