Abstract
A proper diagnosis of the state of an induction motor is of great interest to industry given the great importance of the extended use of this motor. Presently, the use of this motor driven by a frequency converter is very widespread. However, operation by means of an inverter introduces certain difficulties for a correct diagnosis, which results in a signal with higher harmonic content and noise level, which makes it difficult to perform a correct diagnosis. To solve these problems, this article proposes the use of a time-frequency technique known as Dragon Transform together with the functional ANOVA statistical technique to carry out a proper diagnosis of the state of the motor by working directly with the curves obtained from the application of the transform. A case study is presented showing the good results obtained by applying the methodology in which the state of the rotor bars of an inverter-fed motor is diagnosed considering three failure states and operating at different load levels.
Highlights
Published: 22 April 2021The induction motor fed by an inverter is presently a common and practically irreplaceable element in most industrial sectors and in electric traction
The motor has been tested under two load levels and three levels of fault severity
Much effort has been put in recent years in developing techniques for fault detection and diagnosis of the condition of induction motors, there are still challenges to be solved
Summary
Published: 22 April 2021The induction motor fed by an inverter is presently a common and practically irreplaceable element in most industrial sectors and in electric traction. The change in the electrical starting conditions and during continuous operation of the motor changes in turn the failure mechanisms. Focusing on the problems associated with the rotor, the fact that the starting current is much lower decreases stresses on the rotor cage [3]. Other problems arise mainly associated with the higher harmonic content, which increases the level of vibrations and the harmonic torques and temperature in the cage [4,5,6]. The fact that inverters allow operation with repetitive cycles has a negative influence. These stresses will be higher in cases where regenerative braking is used
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