Internally damped stator, rotor, and transformer and a method of making
Assignee3M Innovative Properties Company
InventorsDonald T. Landin, Gordon G. Johnson, Jeffrey W. McCutcheon, Larry S. Hilderbrand
Life of this patent
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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.
Claims19
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.
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.
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.
Dependencies are inferred from the claim text.