Granted Patent B2

US 12,266,464 · App. 17/608,562 · Granted Apr 1, 2025

Inventors: Jörg Buschbeck (Nuremberg, DE); Gotthard Rieger (Munich, DE); Carsten Schuh (Baldham, DE); Thomas Soller (Bayern, DE); Rolf Vollmer (Gersfeld, DE)

Assignee: SIEMENS AKTIENGESELLSCHAFT

H01F27/2804H01F17/0013H02K1/04H02K15/02H01F2027/2809H02K2213/03

Abstract

Claims (16)

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.

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (13)