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Broken rotor bar detection based on current signature analysis of an electric machine

A rotor bar, electrical signal technology, used in motor generator testing, motor control, measuring electricity, etc.

Inactive Publication Date: 2014-10-15
GE ENERGY POWER CONVERSION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When a motor has a faulty rotor bar, the aforementioned techniques are not necessarily able to distinguish between normal operating characteristics and faulty characteristics

Method used

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  • Broken rotor bar detection based on current signature analysis of an electric machine
  • Broken rotor bar detection based on current signature analysis of an electric machine
  • Broken rotor bar detection based on current signature analysis of an electric machine

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Embodiment Construction

[0028] Reference will now be made in detail hereinafter to exemplary embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers are used throughout the drawings to refer to the same or like parts.

[0029] A spectral analysis based technique for high sensitivity detection of rotor broken bar faults in electromechanical machines (EMMs) is described herein. This technique provides for differentiating the condition of a faulty EMM rotor bar from a normal or acceptable condition based on a possibly subtle change in the magnitude of the electrical signature received from the EMM. The main components in electrical signals received from typical electromechanical machines are power fundamental and harmonics, eccentricity harmonics, slot harmonics, saturation harmonics, and other components from unknown sources, including environmental noise. Since such principal components exist both before and after the...

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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.

Description

technical field [0001] The present invention relates generally to the field of monitoring electric machines, and more particularly to broken rotor bar detection in electric machines based on current signature analysis. Background technique [0002] Electromechanical systems are widely used in a variety of applications, such as power generation systems, manufacturing units, factories, electronic appliances, oil rigs, and the like. Electromechanical systems can experience a variety of failures such as drive train failures, bearing failures, broken rotor bars, etc. It is of paramount importance to detect faults in the motor to ensure that losses caused by such faults are minimized to the greatest possible extent. Different techniques currently used for fault detection include but are not limited to vibration and noise analysis, electromagnetic field monitoring and axial flow measurement, temperature measurement, infrared identification and spectral analysis of currents in mach...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/34
CPCG01R31/343G01R31/34H02P29/021H02P29/0241
Inventor P.内蒂S.格鲁比奇张品佳
Owner GE ENERGY POWER CONVERSION TECH
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