A Reconfigurable Motor for Experimental Emulation of Stator Winding Interturn and Broken Bar Faults in Polyphase Induction Machines

Yeh, Chia-Chou; Sizov, Gennadi Y.; Sayed-Ahmed, Ahmed; Demerdash, Nabeel A. O.; Povinelli, Richard J.; Yaz, E.; Ionel, Dan M.

doi:10.1109/tec.2008.2001443

Cited by 44 publications

(8 citation statements)

References 18 publications

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“…In the industry and according to the literature [6,7,8,9], rotor winding faults are very common problem. Most commonly used method for detection of broken rotor bars is method based on current signature analysis (MCSA) [10,11,12,13,14,15,16,17].…”

Section: Introductionmentioning

confidence: 99%

Application of Differential Magnetic Field Measurement (DMFM method) in winding fault detection of AC rotating machines as part of expert monitoring systems

Elez

Študir

Tvorić

2022

joe

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Stator and rotor winding damages in rotating machines are result of electrical, mechanical, and thermal stress. Online magnetic field monitoring via permanently installed measuring coils inside air gap is a well-established methodology which enables winding fault detection. The paper deals with a new method for detection of stator and rotor winding inter-turn short circuits of synchronous machines and slip rings induction machines, as well as rupture of rotor bars and cage ring of induction machines. The method novelty is based on differential measurement of magnetic field by using two serial connected measuring coils. They are installed on the places (stator or rotor teeth) in the machine which have, by absolute value, equal magnetic vector potential. The distance between the measuring coils is n·tp, where tp is a pole pitch, and n = 1, 2, 3, 4,... is a multiple of the pole pitch. Measuring the coil-induced voltage enables us to detect stator and rotor winding faults, which means that measured voltage is approximately zero without fault and increases in the presence of fault. Analysis of the measuring signal allows us to detect and locate fault. With this new method it is possible with high sensitivity to determine winding fault, which enables more reliable fault detection. For example, in comparison with the motor current signature analysis method (the most widely used method for motor faults detection), this new method gives 200 times higher sensitivity to fault occurrence. Also, by using the DMFM method, faults can be detected in the time domain and there is no need for spectral or other complex signal analysis. This is very important because the measuring equipment used for machine fault detection can be simple and more economically acceptable. The DMFM method enables fault detection for even small machines with small expense in a very effective way. The only downside of the DMFM method is the fact that machine should be disassembled in order to install measuring coils. This problem is solved during the machine overhaul or during the manufacturing of the machine, when sensors can be easily implemented in the machine. For machines with large air gap, measuring coils can be installed without a machine disassembly. For the purpose of the method testing, numerous finite-element (FE) simulations on the 2- and 3-D machine models have been carried out to verify the method. Powerful numerical tools generate realistic results with properly selected starting and boundary conditions. By FEM models, actual machines with embedded measuring coils where created and simulated. The voltage induced inside the measuring coils is calculated for different machine states, load point and with and without a fault (broken rotor bar or inter-turn short circuit). Also, this method was experimentally validated via series of laboratory tests performed on the real electric machines specially designed for fault study (broken rotor bars, broken ring and inter-turn short circuits in a stator and rotor winding). Additionally, this method is applied on more than 20 real machines in industry. Due to the large amount of measured data, in this paper, it will be presented only one measurement performed on an induction motor on which we have detected one broken rotor bar. The thickness of the measuring coil designed in the printed circuit board technique is 0.3 mm. The number of turns is from 3 to 10. This new method and performed FEM calculations together with the experimental measurements improve fault detection portfolio knowledge that can be used in monitoring and diagnostics of rotating machines. Furthermore, this patent-pending method is already implemented in three innovative products placed on market (expert monitoring systems), so this method is fully confirmed in practice.

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Section: Introductionmentioning

confidence: 99%

Application of Differential Magnetic Field Measurement (DMFM method) in winding fault detection of AC rotating machines as part of expert monitoring systems

Elez

Študir

Tvorić

2022

joe

View full text Add to dashboard Cite

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“…During the past 20 years, there have been continuing efforts at studying and diagnosing of induction motor faults , and in particular, substantial research work is devoted to induction motor bar breakages and on the development of non‐intrusive diagnostic techniques . Some of these were based on the finite‐element (FE) techniques , whereas others were on the multi‐loop method .…”

Section: Introductionmentioning

confidence: 99%

Study of broken bars in three-phase squirrel-cage induction motors at standstill

Xie¹,

Gu²,

Cao

2012

Int. Trans. Electr. Energ. Syst.

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This paper investigates the characteristic performance of broken bar faults in induction motors at standstill by 2D time-stepping finite-element and experiential approaches. Three identical rotors with the same stator are employed to generate one healthy-rotor, one-broken-bar and two-broken-bar fault cases in a three-phase 1.1-kW squirrel-cage induction motor. The focus is placed on how the broken bar affects air-gap flux density, stator and rotor currents, torque and magnetic force, as well as iron and rotor bar losses. Numerical results are validated by some experimental measurements obtained from a dedicated test rig.

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“…Windings, magnetic circuit and motor mechanical system (mainly bearing failures) faults are the three main categories of faults of induction motors [7]. According to a survey [18] more than 36% of motor failures are related to the stator windings insulation. Turn-to-turn, coil-to-coil, line-to-line, line-to-ground and single or multi-phase windings open circuit faults are considered the main categories of stator windings faults.…”

mentioning

confidence: 99%

Dynamic investigation of Georges phenomenon related to three-phase wound-rotor induction motor

Abdel-Wahab

Abdo

Hanafy

2020

Journal of Electrical Systems and Inf Technol

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The squirrel cage induction motors have dominated the industry due to their wellknown advantages, but in some application wound-rotor induction motor (WRIM) is still more used. The capability of the large WRIMs in developing a high starting torque at low starting currents by the means of adding external resistances in series with the rotor windings makes them ideal for some applications. Besides limiting the starting current, this resistance can also be used in controlling the motor speed. These advantages make the WRIMs suitable for large power industrial application such as cranes, pumps, conveyors and hoists [1]. Asymmetrical operation of induction machine results in unbalanced air gap flux, consequently unbalanced supply currents, increased losses, increased torque pulsations

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A Reconfigurable Motor for Experimental Emulation of Stator Winding Interturn and Broken Bar Faults in Polyphase Induction Machines

Abstract: -The advantages and demerits of a 5-hp

Cited by 44 publications

References 18 publications

Application of Differential Magnetic Field Measurement (DMFM method) in winding fault detection of AC rotating machines as part of expert monitoring systems

Application of Differential Magnetic Field Measurement (DMFM method) in winding fault detection of AC rotating machines as part of expert monitoring systems

Study of broken bars in three-phase squirrel-cage induction motors at standstill

Dynamic investigation of Georges phenomenon related to three-phase wound-rotor induction motor

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