Abstract
An inter-turn fault (ITF) is one of the most frequent induction motor faults; thus, many previous works have studied its model and diagnosis. However, previous works, simplifying the specific distorted flux distribution by the ITF, presented induction motor fault models and focused on the fault signal analysis for diagnoses. Consequently, these results are only adequate for the pretested motor and sensitive to fault signal distortion. This paper presents an induction motor ITF model in the stationary DQ frame, for a model-based diagnosis. Furthermore, to describe the distorted flux distribution along the air gap by the ITF, the rotor flux linkages are described in the independent DQ frame of every pole, and the mutual flux linkages among the rotor, stator, and ITF windings are specifically modeled. Hence, the proposed full model has many current states and mutual inductances to describe the high pole number motor. A simplified model is also proposed for easier usage in the diagnosis, with light ITF to overcome this complexity. Finally, simulation and experiments are performed to verify the presented induction motor ITF fault models.
Highlights
Induction motors have been used in manufacturing industries, household appliances, and recently, electric vehicles, because of their benefits in terms of cost, reliability, and simplicity of control [1,2]
To describe the distorted flux distribution along the air gap by the inter-turn fault (ITF), the rotor flux linkages are described in the independent DQ frame of every pole, and the mutual flux linkages among the rotor, stator, and ITF
They work as a main mechanical power source; any fault of induction motors directly leads to a significant downtime of the entire system
Summary
Induction motors have been used in manufacturing industries, household appliances, and recently, electric vehicles, because of their benefits in terms of cost, reliability, and simplicity of control [1,2]. The stator windings are multiple-wound copper wires in slots coated by a very thin insulation material, to avoid being short-circuited. The abovementioned methods are simple and powerful, but they have some limitations in establishing the fault criteria and demand for pre-experimental data To complement these issues, induction motor models with an ITF, such as the impedance model, winding function model, and the equivalent circuit model, have been studied by many researchers [21,25,26,27]. The full model could be complex in the case of a high pole number induction motor To reduce this full model complexity in the fault diagnosis, a simplified model is proposed, with fewer rotor DQ current states. Simulation and experiments are performed to verify the presented induction motor ITF fault models
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