BROKEN ROTOR BAR DETECTION BASED ON CURRENT SIGNATURE ANALYSIS OF AN ELECTRIC MACHINE
First Claim
1. A method for detecting faults in a rotor bar of an electric machine, the method comprising:
- acquiring electrical signals representative of an operating condition of the electric machine;
eliminating symmetrical components from the electrical signals by squaring an instantaneous value of a data point from the electrical signals and summing the squared values;
eliminating discontinuities in the electrical signals by applying a window function to the squared values to obtain a weighted representation of the electric signals;
normalizing the weighted representation to obtain spectral information; and
analyzing the spectral information to detect fault in the rotor bar.
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Abstract
A method for detection of rotor bar faults in an electric machine is provided. The method includes acquiring electrical signals from the electric machine that are representative of the operative condition of the machine. The symmetrical components from the electrical signals are eliminated by squaring an instantaneous value of each data point from the electrical signals and summing the squared values. The method further includes the step of eliminating discontinuities in the electrical signals by applying a window function to compute weighted representation of the squared values. Furthermore, the method includes the step of normalizing the weighted representation to obtain spectral information. The faults in the rotor bar are detected by analyzing the spectral information obtained after normalization.
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Citations
15 Claims
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1. A method for detecting faults in a rotor bar of an electric machine, the method comprising:
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acquiring electrical signals representative of an operating condition of the electric machine; eliminating symmetrical components from the electrical signals by squaring an instantaneous value of a data point from the electrical signals and summing the squared values; eliminating discontinuities in the electrical signals by applying a window function to the squared values to obtain a weighted representation of the electric signals; normalizing the weighted representation to obtain spectral information; and analyzing the spectral information to detect fault in the rotor bar. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system for detecting faults in a rotor bar of an electric machine, the system comprising:
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one or more sensors for acquiring electrical signals representative of an operating condition of the electric machine; a controller comprising; a processing sub-system configured to; eliminate symmetrical components from the electrical signals by squaring an instantaneous value of each data point from the electrical signals and summing the squared values; eliminate discontinuities in the electrical signal to obtain a weighted result by applying a window function to squared values on the electrical signal; normalize the electrical signals to extract spectral information; and detecting one or more faults in the rotor bar based on analysis of the extracted spectral information. - View Dependent Claims (12, 13, 14, 15)
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Specification