A new technology for motor rotor bar fault detection under no load conditions

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Electric motors are commonly used in various domestic and industrial applications. The problem raised byMahon Electric Co Ltd. (in Thunder Bay, Ontario) is how to detect a broken rotor bar fault under low or noload conditions, which is also an ongoing problem in the industry, and a challenging task in this research field.A lower load corresponds to a smaller slip, which makes it more difficult to detect rotor fault. To tackle thischallenge, the objective of this project, in collaboration with Mahon Electric, is to develop a new slip spectral(SS) technique for broken rotor bar fault detection, under low or no loading. The proposed SS techniqueapplies both electric current and vibration signals for fault detection. Specifically, 1) a smart sensor will bedeveloped for more accurate rotor speed recognition and slip estimation; 2) Adaptive denoising filteringtechnique will be proposed to improve signal-to-noise ratio of the complex signal path from the faulty rotor barto the current sensors; 3) A new approach will be suggested to demodulate average spectral characteristics overthe bands with impulses for rotor bar fault detection under no load conditions. This project will be undertakenwith close collaboration with Mahon Electric. The related research and testing will be performed in thecompany. The rich hands on experience the company's staff will be very helpful to make productive results ofthis project. The proposed SS technology can also be used for general online motor health conditionmonitoring to recognize the motor defect at its earliest stage so as to prevent machinery performancedegradation, malfunction, or even devastating failures. The SS technology can benefit a wide array of Canadiancompanies to gain a competitive advantage in the related market by improving production quality and systemreliability, and reducing costs.