Non-Invasive monitoring and diagnosis of electric machines by measuring external flux density
First Claim
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1. A method for monitoring an electric machine, comprising:
- measuring a magnetic field associated with the electric machine at one or more points external to the electric machine, wherein a respective magnetic field value is associated with each of the one or more points;
comparing the one or more measured magnetic field values to one or more corresponding expected values; and
determining, based at least in part on the comparison, whether a fault is present in the electric machine.
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Abstract
System and methods for monitoring electric machines are provided. A magnetic field associated with the electric machine is measured at one or more points external to the electric machine, wherein a respective magnetic field value is associated with each of the one or more points. The one or more measured magnetic field values are compared to one or more corresponding expected values, and a determination of whether a fault is present in the electric machine is made based at least in part on the comparison.
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Citations
20 Claims
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1. A method for monitoring an electric machine, comprising:
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measuring a magnetic field associated with the electric machine at one or more points external to the electric machine, wherein a respective magnetic field value is associated with each of the one or more points; comparing the one or more measured magnetic field values to one or more corresponding expected values; and determining, based at least in part on the comparison, whether a fault is present in the electric machine. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system for monitoring an electric machine, comprising:
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a plurality of sensors operable to measure a magnetic field associated with the electric machine at a plurality of respective points external to the electric machine; and a control unit operable to; receive the plurality of measurements from the plurality of sensors, determine a combined value of the magnetic field based at least in part on the plurality of measurements, compare the combined value to one or more expected values of the magnetic field, and determine, based at least in part on the comparison, whether a fault is present in the electric machine. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method for monitoring an electric machine, comprising:
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determining at least one value for a magnetic field associated with the electric machine; comparing the at least one determined value to at least one corresponding expected value; and determining, based at least in part on the comparison, whether a fault is present in the electric machine. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification