Modeling and Evaluation of Stator and Rotor Faults for Induction Motors

Jing Tang, Jie Chen, Kan Dong, Yongheng Yang, Haichen Lv and Zhigang Liu
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Jing Tang: School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China
Jie Chen: School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China
Kan Dong: China Academy of Railway Sciences Co. Ltd., Beijing 100081, China
Yongheng Yang: Department of Energy Technology, Aalborg University, 9220 Aalborg, Denmark
Haichen Lv: Beijing Qiansiyu Electric Co. Ltd., Beijing 100082, China
Zhigang Liu: School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China

Energies, 2019, vol. 13, issue 1, 1-20

Abstract: The modeling of stator and rotor faults is the basis of the development of online monitoring techniques. To obtain reliable stator and rotor fault models, this paper focuses on dynamic modeling of the stator and rotor faults in real-time, which adopts a multiple-coupled-circuit method by using a winding function approach for inductance calculation. Firstly, the model of the induction machine with a healthy cage is introduced, where a rotor mesh that consists of a few rotor loops and an end ring loop is considered. Then, the stator inter-turn fault model is presented by adding an extra branch with short circuit resistance on the fault part of a stator phase winding. The broken rotor bar fault is then detailed by merging and removing the broken-bar-related loops. Finally, the discrete models under healthy and faulty conditions are developed by using the Tustin transformation for digital implementation. Moreover, the stator and rotor mutual inductances are derived as a function of the rotor position according to the turn and winding functions distribution. Simulations and experiments are performed on a 2.2-kW/380-V/50-Hz three-phase and four-pole induction motor to show the performance of the stator and rotor faults, where the saturation effect is considered in simulations by exploiting the measurements of a no load test. The simulation results are in close agreement with the experimental results. Furthermore, magnitudes of the characteristic frequencies of 2 f 1 in torque and (1 ± 2 s ) f 1 in current are analyzed to evaluate the stator and rotor fault severity. Both indicate that the stator fault severity is related to the short circuit resistance. Further, the number of shorted turns and the number of continuous broken bars determines the rotor fault severity.

Keywords: motor modeling; stator faults; rotor faults; short circuit; broken rotor bar; winding function approach; saturation effect (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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