Internally damped stator, rotor, and transformer and a method of making

• US 6,499,209 B1
• Filed: 10/16/2000
• Issued: 12/31/2002
• Est. Priority Date: 12/19/1997
• Status: Expired due to Fees

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Landin, Donald T., Hilderbrand, Larry S., McCutcheon, Jeffrey W., Johnson, Gordon G.
• Primary Examiner(s): Vidovich, Gregory M.
• Assistant Examiner(s): Kenny, Stephen
• Application Number:
  US09/688,485
• Time in Patent Office: 806 Days
• Field of Search: 295/96, 295/97, 295/98, 294/28, 294/27, 291/50, 296/09, 310/51, 310/254, 310/261
• US Class Current: 29/596
• CPC Class Codes: H02K 1/04 characterised by the material used for insulating the magnetic circuit or parts thereof
• CPC Class Codes: Y10T 29/49009 Dynamoelectric machine

Abstract

The present invention provides internally damped stators, rotors, and transformers; internally damped cores from which they may be made; and a method of making the aforementioned.

Claims

1. A method of making an internally damped core comprising the steps of:

(a) providing a first laminate section and a second laminate section, wherein the first laminate section is formed by a method comprising the steps of

(i) preparing a first laminate comprising a magnetic layer and a layer of vibration damping material bonded thereto; and

(ii) cutting the first laminate section from the first laminate, the first laminate section having a shape; and

wherein the second laminate section is formed by a method comprising the steps of

(i) preparing a second laminate comprising

(A) a first outer magnetic layer;

(B) a second outer magnetic layer; and

(C) a layer of vibration damping material positioned between the outer magnetic layers;

(ii) cutting the second laminate section from the second laminate,

wherein the second laminate section has shape which is substantially the same as the shape of the first laminate section, wherein the second magnetic layer of the second laminate section has a burr thereon caused by the cutting,

(b) joining the first laminate section and the second laminate section to form a core in such a manner that the burr is not on the outside of the core;

wherein the core is selected from the group consisting of stator cores, rotor cores and transformer cores.

2. The method of claim 1 wherein the laminate sections are joined via vibration damping material.

3. The method of claim 1 wherein the core has edges and wherein the edges are rounded.

4. The method of claim 1 which further comprises the step of winding wire around the core.

5. The method of claim 1 wherein the laminate sections are joined via vibration damping material.

6. A method of making an internally damped core comprising the steps of

(a) providing at least two laminate sections, wherein each laminate section is independently selected from the group consisting of first laminate sections and second laminate sections;

and

wherein each first laminate section is independently formed by a method comprising the steps of

(i) preparing a first laminate comprising a magnetic layer and a layer of vibration damping material bonded thereto; and

(ii) cutting a first laminate section from the first laminate, the first laminate section having a shape; and

wherein each second laminate section is independently formed by a method comprising the steps of

(i) preparing a second laminate comprising

(A) a first outer magnetic layer;

(B) a second outer magnetic layer; and

(C) a layer of vibration damping material positioned between the two outer magnetic layers;

(ii) cutting the second laminate section from the second laminate,

wherein the second laminate section has a shape which is substantially the same as the shape of the first laminate section, and wherein the second magnetic layer of the second laminate section has a burr thereon caused by the cutting;

(b) joining the laminate sections together to form a core in such a manner that no exposed burr is present on the core;

wherein the core is selected from the group consisting of stator cores, rotor cores and transformer cores.

7. The method of claim 6 wherein the laminate sections are joined via vibration damping material.

8. The method of claim 6 wherein the core has edges and wherein the edges are rounded.

9. The method of claim 6 which further comprises the step of winding wire around the core.

10. The method of claim 6 wherein the stator sections are joined via vibration