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Detection of Incipient Faults in Three-Phase Motors Through Analysis of Stator Currents

Abstract:

The detection of incipient faults in three-phase induction motors is a fundamental pillar in the preventive maintenance at the industrial level. Three-phase motors are used in most industrial processes, and thus it is essential to know in advance the fault being generated by the motor, with the objective of avoiding a production stop, there are in the market equipment that help to detect incipient faults, but their cost is very high and it is necessary to process in a computer the information obtained from the equipment to determine the fault. The proposed prototype is a low-cost and easy to use system which detects two types of electric faults, broken bars and short circuits in the windings. Authors describe the general architecture of the prototype, parameters for determining the fault and give details about the implementation and tests of the prototype in WEG W22 High Eff motors. The results obtained show that when the amplitude of the power spectrum in the sidebands varies at particular frequencies, an incipient fault is determined.