MONITORING HEALTH OF ELECTRICAL EQUIPMENT
First Claim
Patent Images
1. A device comprising a motor or generator and an apparatus to monitor the health of the device comprising:
- a plurality of stator windings of the device;
a plurality of sensors to detect root-mean-square (RMS) current values for each of the plurality of stator windings of the device; and
a processor to;
receive the RMS current values from the plurality of sensors;
convert the RMS current values to peak current values;
determine a modified direct current, Id, and a modified quadrature current, Iq, based on the peak current values and using a predetermined phase angle in place of an actual measured phase angle;
compute a fault indicator based on the modified direct current, Id, and the modified quadrature current, Iq, wherein the fault indicator represents a level of current imbalance between the plurality of stator windings due to winding faults; and
transmit the fault indicator to a display device.
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Abstract
Techniques for monitoring the health of a device comprising a motor or generator are described. An apparatus to monitor the health of the device includes a plurality of sensors to detect root-mean-square (RMS) current values for a plurality of stator windings of the device. The apparatus also includes a processor to receive the RMS current values from the plurality of sensors and compute a fault indicator based on the RMS current values. The fault indicator represents a level of current imbalance between the plurality of stator windings due to winding faults.
50 Citations
25 Claims
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1. A device comprising a motor or generator and an apparatus to monitor the health of the device comprising:
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a plurality of stator windings of the device; a plurality of sensors to detect root-mean-square (RMS) current values for each of the plurality of stator windings of the device; and a processor to; receive the RMS current values from the plurality of sensors; convert the RMS current values to peak current values; determine a modified direct current, Id, and a modified quadrature current, Iq, based on the peak current values and using a predetermined phase angle in place of an actual measured phase angle; compute a fault indicator based on the modified direct current, Id, and the modified quadrature current, Iq, wherein the fault indicator represents a level of current imbalance between the plurality of stator windings due to winding faults; and transmit the fault indicator to a display device. - View Dependent Claims (2, 4, 6, 7, 8, 9, 10)
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3. (canceled)
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5. (canceled)
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11. A method of monitoring the health of a motor, comprising:
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generating AC drive currents and delivering the drive currents to a plurality of stator windings of the motor to drive the motor at a specified motor speed; receiving root-mean-square (RMS) current values from a plurality of sensors, wherein each RMS current value represents an RMS current on each of the plurality of stator windings; converting the RMS current values to peak current values; determining a modified direct current, Id, and a modified quadrature current, Iq, based on the peak current values and using a predetermined phase angle in place of an actual measured phase angle computing a fault indicator based on the modified direct current, Id, and the modified quadrature current, Iq, wherein the fault indicator represents a level of current imbalance between the plurality of stator windings due to winding faults; and transmitting the fault indicator to a display device. - View Dependent Claims (12, 14, 16, 17, 18, 19, 20)
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13. (canceled)
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15. (canceled)
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21. A tangible, non-transitory, computer-readable medium comprising instructions that, when executed by a processor, direct the processor to operate a health monitor for a device comprising a motor or generator, the instructions to direct the processor to:
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detect root-mean-square (RMS) current values for a plurality of stator windings of the device; convert the RMS current values to peak current values; determine a modified direct current, Id, and a modified quadrature current, Iq, based on the peak current values and using a predetermined phase angle in place of an actual measured phase angle; compute a fault indicator based on the modified direct current, Id, and the modified quadrature current, Iq, wherein the fault indicator represents a level of current imbalance between the plurality of stator windings due to winding faults; and transmit the fault indicator to a display device. - View Dependent Claims (23, 25)
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22. (canceled)
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24. (canceled)
Specification