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Your search keyword '"Muhammad Faizan"' showing total 10 results
Start Over Author "Muhammad Faizan" Journal ieee transactions on energy conversion
10 results on '"Muhammad Faizan"'

3. A Simple Offline Test for Detecting Rotor Faults in Wound Field Synchronous Machines

Author

Shaikh, Muhammad Faizan, Kim, Han-Ju, Byun, Namhyuk, Lee, Sang Bin, Kim, Kyeongyeol, Kong, Taesik, Ko, Baekkyung, Kim, Kyunghoon, and Park, Hyung-IL

Abstract

Rotor field and damper windings are critical components of wound field synchronous machines (WFSM), where faults can degrade the performance and lead to forced outage of the machine. This necessitates timely and reliable fault detection as false positive indications can cause unwarranted economic losses in case the machine is disassembled prematurely. Applying multiple offline test methods in tandem with online monitoring can minimize the likelihood of false indications. In this letter, a simple offline test method based on the ac impedance of the rotor winding is presented. It is shown that field and damper winding faults can be detected and differentiated without machine disassembly. Experimental testing on three WFSMs verifies that the proposed method can provide a simple test for identifying field and damper winding faults with high sensitivity, and also complement existing tests for improving the reliability of fault diagnosis.

Published
2023
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5. A Non-Intrusive Leakage Flux Based Method for Detecting Rotor Faults in the Starting Transient of Salient Pole Synchronous Motors

Author

Sang Bin Lee, Jongsan Park, and Muhammad Faizan Shaikh

Subjects
Computer science, Rotor (electric), 020208 electrical & electronic engineering, Magnetic flux leakage, Energy Engineering and Power Technology, 02 engineering and technology, Field coil, Fault detection and isolation, Damper, law.invention, Control theory, Electromagnetic coil, law, 0202 electrical engineering, electronic engineering, information engineering, Electrical and Electronic Engineering, Synchronous motor, Induction motor
Abstract

Damper and field windings are critical components of wound field synchronous motors (WFSM), where failure can lead to forced outage of the motor and industrial process. Due to the relatively rare presence of WFSMs in industry compared to induction motors, research on fault detection techniques for WFSMs is not as active. Rotor fault detection in WFSMs is also difficult, as synchronous operation leaves damper bars inactive during steady state operation while a small number of shorted field windings do not cause noticeable asymmetry. Therefore, most of the field-wide accepted tests rely on off-line testing or visual inspection of the rotor, or require airgap flux measurements, which necessitate motor disassembly and/or installation of sensors. Hence non-intrusive test methods which do not require motor disassembly are sorely needed to guarantee continued operation of the motor and industrial process. In this article, novel test methods based on the use of the leakage flux measured via search coils placed externally on the motor frame are proposed. A non-intrusive method for detecting and distinguishing damper and field winding faults during motor starting is devised from the time and frequency domain analysis of leakage flux and current. The methods are verified via experimental testing on a 30-kW salient pole WFSM.

Published
2021

8. Alternative Test Methods for Monitoring the Condition of Brushless Exciters in Synchronous Machines.

Author

Kim, Han-Ju, Shaikh, Muhammad Faizan, Lee, Sang Bin, Platero, Carlos A., and Kim, Taehyung

Subjects
*TEST methods, *SYSTEM failures, *ROTATIONAL motion, *MACHINERY, *RELIABILITY in engineering, *MACHINE performance, *SYNCHRONOUS electric motors, *BRUSHLESS electric motors
Abstract

Although brushless excitation systems in synchronous machines have reduced the maintenance requirements and brush-related failures, they have increased the operating stresses on the excitation system components. Since the rotating excitation system is not accessible, it is difficult to detect excitation system failures such as open circuit diodes or open armature windings to prevent degradation in machine performance and reliability. Detection of such failures currently relies on monitoring the magnitude and harmonic content of the exciter field current. However, it is desirable to improve the reliability of fault detection with multiple test methods, considering the high cost of brushless exciter testing and repair due to the requirement of machine outage/disassembly. In this work, alternative off-line testing and on-line monitoring options are proposed for detection of excitation system failures. An off-line test based on ac excitation of the exciter field and on-line monitoring based on stator current and airgap flux analysis, are investigated, and fault indicators sensitive to excitation system failures are proposed for reliable fault monitoring. An experimental study on 3.8, 5.5, and 30 kW synchronous machines is given to validate the claims on the sensitivity and reliability of the proposed test methods. [ABSTRACT FROM AUTHOR]

Published
2022
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