Gearbox Noise Reduction By Electrical Drive Control
First Claim
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1. A system for damping audible noise from a drive train, the system comprising:
- a noise signal from said drive train;
a damping circuit producing a damping torque, wherein said damping torque is a phase shifted and amplified version of said noise signal; and
an electric machine coupled to said drive train, wherein said damping torque is applied to an air-gap torque of said electric machine thereby reducing said audible noise.
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Abstract
A system for damping audible noise from a drive train. One embodiment is a system with an audible noise signal from a drive train wherein a damping circuit produces a damping torque that is a phase shifted and amplified version of the noise signal that is applied to the air-gap torque of a generator or motor coupled to the drive train and effectively reduces the audible noise.
117 Citations
21 Claims
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1. A system for damping audible noise from a drive train, the system comprising:
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a noise signal from said drive train; a damping circuit producing a damping torque, wherein said damping torque is a phase shifted and amplified version of said noise signal; and an electric machine coupled to said drive train, wherein said damping torque is applied to an air-gap torque of said electric machine thereby reducing said audible noise. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for damping audible noise from a drive train, comprising:
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processing a noise signal from said drive train having a noise frequency; generating a corrective damping signal wherein said corrective damping signal has a phase shift and with a frequency approximately equal to said noise frequency; modulating a torque signal with said corrective damping signal to produce a modulated torque corrective signal; and applying said modulated torque corrective signal to an electrical machine coupled to said drive train thereby reducing said audible noise. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification