High power density cooling of electrical machines using ceramic tubes of high thermal conductivity
First Claim
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1. A generator, comprising:
- at least one armature structure comprising a plurality of conductors; and
at least one hollow heat transfer duct thermally coupled to said at least one armature structure;
wherein said at least one hollow heat transfer duct comprises a material having a thermal conductivity of at least 20 W/mK and an electrical breakdown strength of at least 60 V/mil, and wherein the material is selected from the group consisting of ceramic, alumina, berrylia, aluminum nitride, silicon carbide, and combinations thereof.
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Abstract
A high power density generator contains an armature structure having a plurality of conductors and at least one heat transfer tube thermally coupled to the conductors. The tube is hollow so as to allow a heat transfer fluid to pass through it. The tube is made of a material having a thermal conductivity λ of at least 20 W/mK, an electrical breakdown strength of at least 60 V/mil, and a mechanical strength adequate for handling, manufacturing and operation. In an embodiment of the invention, the tube is made of a ceramic material.
20 Citations
24 Claims
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1. A generator, comprising:
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at least one armature structure comprising a plurality of conductors; and at least one hollow heat transfer duct thermally coupled to said at least one armature structure; wherein said at least one hollow heat transfer duct comprises a material having a thermal conductivity of at least 20 W/mK and an electrical breakdown strength of at least 60 V/mil, and wherein the material is selected from the group consisting of ceramic, alumina, berrylia, aluminum nitride, silicon carbide, and combinations thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A generator, comprising:
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at least one armature structure comprising a plurality of conductors; and at least one hollow heat transfer duct thermally coupled to said at least one armature structure; wherein said at least one hollow heat transfer duct comprises a ceramic material having a thermal conductivity of at least 20 W/mK and an electrical breakdown strength of at least 60V/mil. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A generator, comprising:
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at least one of an armature structure comprising a plurality of conductors and a core portion; and at least one hollow heat transfer duct thermally coupled to either one of said at least one armature structure and said core portion; wherein said at least one hollow heat transfer duct comprises a material having a thermal conductivity of at least 20 W/mK and an electrical breakdown strength of at least 60 V/mil, and wherein the material is selected from the group consisting of ceramic, alumina, berrylia, aluminum nitride and silicon carbide, and combinations thereof. - View Dependent Claims (21, 22, 23, 24)
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Specification