Electric load damper for damping torsional oscillation
First Claim
1. An electric load damper assembly, comprising:
- a synchronous generator operable to provide a plurality of phases of electrical output in response to a mechanical input from a rotating shaft;
an electric load damper including a phase leg for each of the plurality of phases, each phase leg comprising;
a resistive load;
a snubber; and
at least one solid state switch connected in parallel with the snubber, the at least one solid state switch and snubber being collectively connected in series with the resistive load; and
a controller operable to receive a signal indicative of a rotational speed oscillation of the synchronous generator, and operable to selectively reduce a torsional oscillation of the shaft by diverting electrical current from the synchronous generator through the resistive load of each of the plurality of phases in response to the signal exceeding a predefined rotational speed oscillation threshold.
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Accused Products
Abstract
An electric load damper assembly includes a synchronous generator operable to provide a plurality of phases of electrical output in response to a mechanical input from a rotating shaft. An electric load damper includes a phase leg for each of the plurality of phases. Each phase leg includes a resistive load, a snubber and at least one solid state switch. The at least one solid state switch is in parallel with the snubber, and the at least one solid state switch and snubber are collectively in series with the resistive load. A controller is operable to receive a signal indicative of a rotational speed oscillation of the synchronous generator, and is operable to selectively reduce a torsional oscillation of the shaft by diverting electrical current from the synchronous generator through the resistive load of each of the plurality of phases in response to the signal exceeding a predefined threshold.
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Citations
19 Claims
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1. An electric load damper assembly, comprising:
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a synchronous generator operable to provide a plurality of phases of electrical output in response to a mechanical input from a rotating shaft; an electric load damper including a phase leg for each of the plurality of phases, each phase leg comprising; a resistive load; a snubber; and at least one solid state switch connected in parallel with the snubber, the at least one solid state switch and snubber being collectively connected in series with the resistive load; and a controller operable to receive a signal indicative of a rotational speed oscillation of the synchronous generator, and operable to selectively reduce a torsional oscillation of the shaft by diverting electrical current from the synchronous generator through the resistive load of each of the plurality of phases in response to the signal exceeding a predefined rotational speed oscillation threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of damping torsional oscillation, comprising:
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receiving a signal indicative of a rotational speed oscillation of a synchronous generator, the synchronous generator being driven by a rotating shaft; and diverting electrical current from each of a plurality of phases of the synchronous generator through a plurality of resistive loads, each resistive load corresponding to one of the plurality of phases to reduce a torsional oscillation of the shaft in response to the oscillations exceeding a predefined rotational speed oscillation threshold. - View Dependent Claims (12, 13, 14, 15)
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16. An aircraft torsional oscillation damping system, comprising:
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a gas turbine engine having at least one rotating shaft; at least one synchronous generator operable to provide a plurality of phases of electrical output in response to a mechanical input from a rotating shaft; at least one electric load damper, each of the at least one synchronous generators having an associated electric load damper, the at least one electric load damper including a phase leg for each of the plurality of phases, each phase leg comprising; a resistive load; a snubber; and at least one solid state switch in parallel with the snubber, the at least one solid state switch and snubber being collectively in series with the resistive load; and a controller operable to receive a signal indicative of a rotational speed oscillation of the synchronous generator, and operable to selectively reduce a torsional oscillation of the shaft by diverting electrical current from the synchronous generator through the resistive load of each of the plurality of phases in response to the signal exceeding a predefined rotational speed oscillation threshold. - View Dependent Claims (17, 18, 19)
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Specification