THERMALLY MATCHED COMPOSITE SLEEVE
First Claim
Patent Images
1. A rotor for an electrical machine comprising:
- a rotor core substantially comprised of a first material;
a plurality of permanent magnets carried on the rotor core, the plurality of permanent magnets substantially comprised of a second material that is different from the first material; and
a sleeve about the rotor core and the plurality of permanent magnets and comprising a fiber-reinforced composite layer about the rotor core and the plurality of permanent magnets, at least a portion of the sleeve about the rotor core and the permanent magnets having a coefficient of thermal expansion that is substantially equal to the coefficient of thermal expansion of the plurality of permanent magnets.
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Accused Products
Abstract
A sleeve about an electric machine rotor core and the plurality of permanent magnets has a fiber-reinforced composite layer about the rotor core and the plurality of permanent magnets. At least a portion of the sleeve about the rotor core and the permanent magnets has a coefficient of thermal expansion that is substantially equal to the aggregate coefficient of thermal expansion of the rotor core and the plurality of permanent magnets.
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Citations
18 Claims
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1. A rotor for an electrical machine comprising:
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a rotor core substantially comprised of a first material; a plurality of permanent magnets carried on the rotor core, the plurality of permanent magnets substantially comprised of a second material that is different from the first material; and a sleeve about the rotor core and the plurality of permanent magnets and comprising a fiber-reinforced composite layer about the rotor core and the plurality of permanent magnets, at least a portion of the sleeve about the rotor core and the permanent magnets having a coefficient of thermal expansion that is substantially equal to the coefficient of thermal expansion of the plurality of permanent magnets. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A rotor for an electrical machine comprising:
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a rotor core substantially comprised of a first material; a plurality of permanent magnets carried on the rotor core, the plurality of permanent magnets substantially comprised of a second material that is different from the first material; and a sleeve about the rotor core and the plurality of permanent magnets and comprising a fiber-reinforced composite layer about the rotor core and the plurality of permanent magnets, at least a portion of the sleeve about the rotor core and the permanent magnets having a coefficient of thermal expansion that is substantially equal to the aggregate coefficient of thermal expansion of the rotor core and the plurality of permanent magnets. - View Dependent Claims (9, 10, 11, 12, 13, 18)
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14. A method of retaining elements of an elongate electric machine rotor, the method comprising:
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retaining a plurality of permanent magnets to a core of the rotor with a sleeve comprising a fiber-reinforced composite layer, the fiber-reinforced composite layer having a coefficient of thermal expansion that is substantially equal to the coefficient of thermal expansion of the permanent magnets; and expanding the fiber-reinforced composite layer substantially along the length of the core of the rotor in response to a change in temperature in approximately the same amount as the permanent magnets expand along the length of the core of the rotor in response to the change temperature. - View Dependent Claims (15, 16, 17)
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Specification