Prognostics and life estimation of electrical machines
First Claim
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1. A method, comprising:
- measuring an operating parameter comprising at least one of a phasor current and phasor voltage of an electrical machine;
determining a diagnostic parameter indicative of a fault of the electrical machine based on the measured operating parameter by computing a plurality of present values indicative of the diagnostic parameter, each present value corresponding to a time instant during operation of the electrical machine;
selecting a data model for the diagnostic parameter;
estimating at least one constant of the data model based on the plurality of present values indicative of the diagnostic parameter;
estimating a future value indicative of the diagnostic parameter using the at least one estimated constant of the data model;
estimating end of life of the electrical machine when the future value exceeds a pre-determined threshold value; and
controlling the operating parameter of the electrical machine based on the estimated end of life.
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Abstract
The method includes measuring an operating parameter comprising at least one of a phasor current and phasor voltage of an electrical machine. The method further includes determining a diagnostic parameter indicative of a fault of the electrical machine based on the measured operating parameter. The method also includes estimating end of life of the electrical machine based on the diagnostic parameter using an error minimization method.
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Citations
20 Claims
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1. A method, comprising:
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measuring an operating parameter comprising at least one of a phasor current and phasor voltage of an electrical machine; determining a diagnostic parameter indicative of a fault of the electrical machine based on the measured operating parameter by computing a plurality of present values indicative of the diagnostic parameter, each present value corresponding to a time instant during operation of the electrical machine; selecting a data model for the diagnostic parameter; estimating at least one constant of the data model based on the plurality of present values indicative of the diagnostic parameter; estimating a future value indicative of the diagnostic parameter using the at least one estimated constant of the data model; estimating end of life of the electrical machine when the future value exceeds a pre-determined threshold value; and controlling the operating parameter of the electrical machine based on the estimated end of life. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system comprising:
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a current sensor for measuring a phasor current of an electrical machine; a voltage sensor for measuring a phasor voltage of the electrical machine; and a fault estimation module communicatively coupled to the current sensor and the voltage sensor and configured to; determine a diagnostic parameter indicative of a fault of the electrical machine based on at least one of the measured phasor current and the phasor voltage by computing a plurality of present values indicative of the diagnostic parameter, each present value corresponding to a time instant during operation of the electrical machine; select a data model for the diagnostic parameter; estimate at least one constant of the data model based on the plurality of present values indicative of the diagnostic parameter; estimate a future value indicative of the diagnostic parameter using the at least one estimated constant of the data model; estimate end of life when the future value indicative of the diagnostic parameter exceeds a pre-determined threshold value; and control at least one of the phasor current and the phasor voltage of the electrical machine based on the estimated end of life. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A non-transitory computer readable medium encoded with a program to instruct a processing unit to:
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measure an operating parameter comprising at least one of a phasor current and a phasor voltage of an electrical machine; determine a diagnostic parameter indicative of a fault of the electrical machine based on the measured operating parameter by computing a plurality of present values indicative of the diagnostic parameter, each present value corresponding to a time instant during operation of the electrical machine; select a data model for the diagnostic parameter; estimate at least one constant of the data model based on the plurality of present values indicative of the diagnostic parameter; estimate a future value indicative of the diagnostic parameter using the at least one estimated constant of the data model; estimate end of life of the electrical machine when the future value exceeds a pre-determined threshold value; and control the operating parameter of the electrical machine based on the estimated end of life.
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Specification