System and method for measuring dynamic loads in a magnetic bearing
First Claim
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1. A system for measuring dynamic loads in a rotordynamic system having a rotor, comprising:
- a magnetic bearing disposed around the rotor and having a plurality of magnets; and
at least one fiber optic strain gage associated with a pole of a respective one of the plurality of magnets, the fiber optic strain gage operable to detect a strain on the pole resulting from the dynamic loads.
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Abstract
A system for measuring dynamic loads in a rotordynamic system having a rotor includes a magnetic bearing disposed around the rotor and having a plurality of magnets and at least one fiber optic strain gage associated with a pole of a respective magnet. The fiber optic strain gage is operable to detect a strain on the respective pole resulting from the dynamic loads. The detected strain is indicative of the dynamic loads.
15 Citations
26 Claims
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1. A system for measuring dynamic loads in a rotordynamic system having a rotor, comprising:
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a magnetic bearing disposed around the rotor and having a plurality of magnets; and
at least one fiber optic strain gage associated with a pole of a respective one of the plurality of magnets, the fiber optic strain gage operable to detect a strain on the pole resulting from the dynamic loads. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system for measuring dynamic loads in a rotordynamic system having a rotor, comprising:
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a magnetic bearing disposed around the rotor and having a plurality of magnets, each magnet having two poles and formed from a plurality of metal plates;
a first fiber optic strain gage disposed within a pole of a first magnet such that an end of the first fiber optic strain gage is proximate an end of the pole of the first magnet;
a second fiber optic strain gage disposed within a pole of a second magnet such that an end of the second fiber optic strain gage is proximate an end of the pole of the second magnet, the second fiber optic strain gage oriented approximately ninety degrees from the first fiber optic strain gage with respect to the rotor; and
wherein the first and second fiber optic strain gages are operable to detect first and second strains on their respective poles resulting from the dynamic loads. - View Dependent Claims (9, 10)
a third fiber optic strain gage disposed within a pole of a third magnet such that an end of the third fiber optic strain gage is proximate an end of the pole of the third magnet, the third fiber optic strain gage oriented approximately 180 degrees from the first fiber optic strain gage with respect to the rotor; and
a fourth fiber optic strain gage disposed within a pole of a fourth magnet such that an end of the fourth fiber optic strain gage is proximate an end of the pole of the fourth magnet, the fourth fiber optic strain gage oriented approximately 180 degrees from the second fiber optic strain gage with respect to the rotor.
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10. The system of claim 8, further comprising a third fiber optic strain gage disposed within a pole of a third magnet such that an end of the third fiber optic strain gage is proximate an end of the pole of the third magnet, and wherein the first, second, and third fiber optic strain gages are oriented approximately 120 degrees from one another with respect to the rotor.
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11. A method for measuring dynamic loads in a rotordynamic system having a rotor, comprising:
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disposing a magnetic bearing around the rotor, the magnetic bearing having a plurality of magnets;
associating at least one fiber optic strain gage with a pole of a respective one of the plurality of magnets; and
detecting, via the fiber optic strain gage, a strain on the pole resulting from the dynamic loads. - View Dependent Claims (12, 13, 14, 15, 16, 17)
associating two fiber optic strain gages with poles of two of the magnets; and
orienting, with respect to the rotor, the two fiber optic strain gages approximately ninety degrees from one another.
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16. The method of claim 11, wherein associating the at least one fiber optic strain gage with the pole of the respective one of the plurality of magnets comprises:
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associating four fiber optic strain gages with poles of four of the magnets; and
orienting, with respect to the rotor, the four fiber optic strain gages approximately ninety degrees from one another.
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17. The method of claim 11, wherein associating the at least one fiber optic strain gage with the pole of the respective one of the plurality of magnets comprises:
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associating three fiber optic strain gages with poles of three of the magnets; and
orienting, with respect to the rotor, the three fiber optic strain gages approximately 120 degrees from one another.
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18. A method for measuring dynamic loads in a rotordynamic system having a rotor, comprising:
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disposing a magnetic bearing around the rotor, the magnetic bearing having a plurality of magnets, each magnet having two poles and formed from a plurality of metal plates;
disposing a first fiber optic strain gage within a pole of a first magnet such that an end of the first fiber optic strain gage is proximate an end of the pole of the first magnet;
disposing a second fiber optic strain gage within a pole of a second magnet such that an end of the second fiber optic strain gage is proximate an end of the pole of the second magnet;
orienting, with respect to the rotor, the second fiber optic strain gage approximately ninety degrees from the first fiber optic strain gage; and
detecting, via the first and second fiber optic strain gages, first and second strains on their respective poles resulting from the dynamic loads. - View Dependent Claims (19, 20)
disposing a third fiber optic strain gage within a pole of a third magnet such that an end of the third fiber optic strain gage is proximate an end of the pole of the third magnet;
orienting the third fiber optic strain gage approximately 180 degrees from the first fiber optic strain gage with respect to the rotor;
disposing a fourth fiber optic strain gage within a pole of a fourth magnet such that an end of the fourth fiber optic strain gage is proximate an end of the pole of the fourth magnet; and
orienting the fourth fiber optic strain gage approximately 180 degrees from the second fiber optic strain gage with respect to the rotor.
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20. The method of claim 18, further comprising:
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disposing a third fiber optic strain gage within a pole of a third magnet such that an end of the third fiber optic strain gage is proximate an end of the pole of the third magnet; and
orienting the first, second, and third fiber optic strain gages approximately 120 degrees from one another with respect to the rotor.
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21. A method for calibrating a fiber optic strain gage associated with a magnetic bearing supporting a shaft, the method comprising:
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applying a force to the shaft;
measuring a first magnitude of the force with a calibrated system associated with the magnetic bearing;
detecting a strain on a pole of a magnet of the magnetic bearing with the fiber optic strain gage;
determining a second magnitude of the force based on the detected strain;
comparing the first magnitude and the second magnitude; and
adjusting the fiber optic strain gage based on the comparison. - View Dependent Claims (22, 23, 24, 25, 26)
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Specification