Electrical steel lamination stacks with magnetic insulator coating for electrical apparatus cores

Patent metadata

Field	Value
Publication number	US-12237103-B2
Application number	US-202217583080-A
Country	US
Kind code	B2
Filing date	Jan 24, 2022
Priority date	Jan 24, 2022
Publication date	Feb 25, 2025
Grant date	Feb 25, 2025

Abstract

A core for an electrical apparatus includes a plurality of electrical steel sheets having a ferromagnetic or ferrimagnetic coating applied to both sides of the electrical steel sheets. The electrical steel sheets are arranged in a stack to form a laminated stack. The ferromagnetic or ferrimagnetic coating is applied to both sides of the electrical steel sheets. The coating may comprise MnZn ferrites, NiZn ferrites, MgMnZn ferrites, CoNiZn ferrites, Co ferrites, Ni ferrites, Yttrium iron garnets (Y3Fe5O12) or other ferromagnetic or ferrimagnetic coating materials.

First claim

What is claimed is:

1. A core for an electrical apparatus comprising:
a plurality of electrical steel sheets arranged in a stack to form a laminated stack; and
a magnetic insulator coating applied to both sides of the electrical steel sheets, wherein a relative magnetic permeability of the coating is between μ r =500 to 20,000, wherein
the magnetic insulator coating allows magnetic flux to pass in a normal direction to a plane of the laminated stack to increase saturation flux density of the laminated stack.

2. The core of claim 1 wherein the coating is electrically insulating and has a finite and greater than 1 dielectric constant.

3. The core of claim 1 wherein the coating consists of:
MnZn ferrites;
NiZn ferrites;
MgMnZn ferrites;
CoNiZn ferrites;
Co ferrites;
Ni ferrites; or
Yttrium iron garnets (Y3Fe5O12).

4. The core of claim 1 wherein the coating has a thickness of between is 0.05 and 5 micrometers.

5. The core of claim 1 wherein the core is adapted to be used in a transformer.

6. The core of claim 1 wherein the core is adapted to be used in an inductor.

7. The core of claim 1 wherein the core is adapted to be used in a stator.

8. The core of claim 1 wherein the core is adapted to be used in a rotor.

9. A core for an electrical apparatus comprising:
a plurality of electrical steel sheets arranged in a stack to form a laminated stack; and
an electrically insulative magnetically permeable coating applied to both sides of the electrical steel sheets, wherein a relative electrical permittivity of the coating is finite and greater than 1, and the relative magnetic permeability of the coating is between μ r =500 to 20,000, wherein
the magnetic insulator coating allows magnetic flux to pass in a normal direction to a plane of the laminated stack to increase saturation flux density of the laminated stack.

10. The core of claim 9 wherein the coating consists essentially of:
MnZn ferrites;
NiZn ferrites;
MgMnZn ferrites;
CoNiZn ferrites;
Co ferrites;
Ni ferrites; or
Yttrium iron garnets (Y3Fe5O12).

11. The core of claim 9 wherein the coating has a thickness of between 0.05 and 5 micrometers.

12. The core of claim 9 wherein the core is adapted to be used in a transformer.

13. The core of claim 9 wherein the core is adapted to be used in an inductor.

14. The core of claim 9 wherein the core is adapted to be used in a stator.

15. The core of claim 9 wherein the core is adapted to be used in a rotor.

16. A core for an electrical apparatus comprising: a plurality of electrical steel sheets arranged in a stack to form a laminated stack; and
an electrically insulative magnetically permeable coating applied to both sides of the electrical steel sheets, wherein the coating comprises:
MnZn ferrites;
NiZn ferrites;
MgMnZn ferrites;
CoNiZn ferrites;
Co ferrites;
Ni ferrites; or
Yttrium iron garnets (Y3Fe5O12), wherein
the magnetic insulator coating allows magnetic flux to pass in a normal direction to a plane of the laminated stack to increase saturation flux density of the laminated stack.

17. The core of claim 16 wherein the coating has a thickness of between 0.05 and 5 micrometers.

18. The core of claim 16 wherein the relative magnetic permeability of the coating is between μ r =500 to 20,000.

Assignees

• Ford Global Tech Llc

Inventors

• Zhu Leyi
• Leonardi Franco
• Degner Michael W

Classifications

• H02K1/02

  characterised by the magnetic material · CPC title

• H01F41/0233

  Manufacturing of magnetic circuits made from sheets (magnetic cores made from sheets H01F27/245; soft magnetic alloys in the form of sheets H01F1/16) · CPC title

• H01F10/20

  Ferrites · CPC title

• H02K2213/03

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

• C09D5/23

  Magnetisable or magnetic paints or lacquers · CPC title