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

• US 6,191,510 B1
• Filed: 12/19/1997
• Issued: 02/20/2001
• 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., McCutcheon, Jeffrey W., Johnson, Gordon G., Hilderbrand, Larry S.
• Primary Examiner(s): ENAD, ELVIN GENARGUE
• Application Number:
  US08/994,496
• Time in Patent Office: 1,159 Days
• Field of Search: 310/64, 310/51, 310/254, 310/261, 310/45
• US Class Current: 310/51
• 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. An internally damped core having at least one inner layer of vibration damping material comprising a viscoelastic material contained therein, wherein the viscoelastic material has a loss factor of at least about 0.1 at a temperature of about 20°

C. and a frequency falling within a range of about 1-10,000 Hz, and wherein the core is selected from the group consisting of stator, rotor and transformer cores.

2. An internally damped transformer comprising the core of claim 1, wherein the core is a transformer core, and wire wrapped around the core.

3. The core of claim 1 wherein the vibration damping material further comprises a thermally conductive additive.

4. The core of claim 1 wherein the vibration damping material further comprises a magnetic additive.

5. An internally damped core, wherein the internally damped core comprises a laminate comprising:

(a) two outer magnetic layers;

(b) an inner layer of vibration damping material comprising a viscoelastic material positioned between the two outer magnetic layers, wherein the viscoelastic material has a loss factor of at least about 0.1 at a temperature of about 20°

C. and a frequency falling within a range of about 1-10,000 Hz;

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

6. The core claim 5 wherein the magnetic layers are non-oriented.

7. The core of claim 5 wherein the core has edges and wherein the edges are rounded.

8. An internally damped core, wherein the internally damped core comprises a laminate comprising:

(a) two outer magnetic layers;

(b) at least two inner vibration damping material layers comprising a viscoelastic material positioned between the two outer magnetic layers, wherein the viscoelastic material has a loss factor of at least about 0.1 at a temperature of about 20°

C. and a frequency falling within a range of about 1-10,000 Hz;

(c) at least one magnetic layer positioned interior to the outer magnetic layers;

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

9. The internally damped core of claim 8 wherein each vibration damping material layer is positioned between two magnetic layers.

10. The core of claim 8 wherein each magnetic layer comprises a ring having poles extending therefrom.

11. The core of claim 10 wherein each ring has at least 4 poles extending therefrom.

12. The core of claim 10 wherein each ring has at least 8 poles extending therefrom.

13. An internally damped stator comprising the core of claim 10, wherein the core is a stator core, and wire wrapped around the poles of the core.

14. An alternator having the stator of claim 13 installed therein.

15. A motor having the stator of claim 13 installed therein.

16. An internally damped rotor comprising the core of claim 10, wherein the core is a rotor core, and wire wrapped around the core.

17. A motor having the rotor of claim 16 installed therein.

18. The core of claim 8, which comprises at least 8 magnetic layers and at least 7 vibration damping material layers.

19. The core of claim 8 which comprises at least 20 magnetic layers and at least 19 vibration damping material layers.