Rotor assembly having bonded lamination stack
First Claim
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1. A method of fabricating a rotor assembly, comprising:
- applying a dielectric bonding agent to surfaces of a plurality of laminations;
wherein the dielectric bonding agent and the laminations have substantially matching coefficients of thermal expansion;
stacking the plurality of laminations; and
applying a thermal cycle to said stack of laminations of sufficient temperature to cure said dielectric bonding agent such that the laminations maintain a bond in operating temperatures up to 1000 degrees Fahrenheit.
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Abstract
A rotor assembly includes a stack of laminations that are bonded together by a dielectric bonding agent. The laminations and the dielectric bonding agent have matching coefficients of thermal expansion.
31 Citations
17 Claims
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1. A method of fabricating a rotor assembly, comprising:
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applying a dielectric bonding agent to surfaces of a plurality of laminations;
wherein the dielectric bonding agent and the laminations have substantially matching coefficients of thermal expansion;
stacking the plurality of laminations; and
applying a thermal cycle to said stack of laminations of sufficient temperature to cure said dielectric bonding agent such that the laminations maintain a bond in operating temperatures up to 1000 degrees Fahrenheit. - View Dependent Claims (2, 3, 4, 5)
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6. A method of fabricating a rotor assembly, comprising:
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annealing a plurality of laminations;
applying a dielectric bonding agent to surfaces of each lamination of the plurality of laminations;
applying a dielectric bonding agent to the surfaces of end caps;
wherein the dielectric bonding agent and the laminations have substantially matching coefficients of thermal expansion;
stacking the plurality of laminations into a stack;
placing one end cap at each end of the stack;
applying pressure on both end caps to compress the stack;
heating the stack and the end caps to a temperature sufficient to cure the dielectric bonding agent;
such that the cured bonding agent is able to maintain the bond of the stack and of the end caps at operating temperatures up to 1000 degrees F.; and
removing the heating and pressure from the end caps and the stack. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. A method of fabricating a rotor assembly, comprising:
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annealing each lamination of a plurality of laminations;
applying a dielectric bonding agent to the surfaces of each lamination of the plurality of laminations;
wherein the dielectric bonding agent and the laminations have approximately equal coefficients of thermal expansion;
stacking the laminations; and
applying a thermal cycle to the stacked laminations to cure the dielectric bonding agent;
wherein the temperature at which said thermal cycle is performed provides a cured bond that can endure operating temperatures up to 1000 degrees Fahrenheit. - View Dependent Claims (14, 15, 16, 17)
applying the dielectric bonding agent to end caps;
stacking the end caps at each end of the stacked laminations; and
additionally applying the pressure load to the end caps during the thermal cycle.
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17. The method of claim 16, further comprising removing excess bonding agent from the stacked laminations.
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