Simplified axial flux spectrum method to detect incipient stator inter-turn short-circuits in induction machine

Assaf, T.; Henao, H.

doi:10.1109/isie.2004.1571918

Cited by 56 publications

(27 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Since a turn fault also creates some asymmetry in the machine and thus some axial leakage flux, the monitoring of this flux can be used for detecting turn faults. This technique has been the topic of several publications [88], [89].…”

Section: Signature Analysis 1) Axial Leakage Fluxmentioning

confidence: 99%

A Survey on Testing and Monitoring Methods for Stator Insulation Systems of Low-Voltage Induction Machines Focusing on Turn Insulation Problems

Grubic

Aller

Lü

et al. 2008

IEEE Trans. Ind. Electron.

407

178

View full text Add to dashboard Cite

Abstract-A breakdown of the electrical insulation system causes catastrophic failure of the electrical machine and brings large process downtime losses. To determine the conditions of the stator insulation system of motor drive systems, various testing and monitoring methods have been developed. This paper presents an in-depth literature review of testing and monitoring methods, categorizing them into online and offline methods, each of which is further grouped into specific areas according to their physical nature. The main focus of this paper is on testing and monitoring techniques that diagnose the condition of the turn-to-turn insulation of low-voltage machines, which is a rapidly expanding area for both research and product development efforts. In order to give a compact overview, the results are summarized in two tables. In addition to monitoring methods on turn-to-turn insulation, some of the most common methods to assess the stator's phase-to-ground and phase-to-phase insulation conditions are included in the tables as well.

show abstract

Section: Signature Analysis 1) Axial Leakage Fluxmentioning

confidence: 99%

A Survey on Testing and Monitoring Methods for Stator Insulation Systems of Low-Voltage Induction Machines Focusing on Turn Insulation Problems

Grubic

Aller

Lü

et al. 2008

IEEE Trans. Ind. Electron.

407

178

View full text Add to dashboard Cite

show abstract

“…The most widely used method for detection of motor asymmetry in rotor/stator is identification of side band harmonics or related fault harmonics by analysis of motor current signature (MCSA)at steady state through FFT technique [2 -6] which is non-invasive. Other techniques used for fault detection are axial flux monitoring [7], acoustics [8] and vibration measurement [9],measurement of torque profile [10], voltage monitoring [4].This require special transducer or sensor to be fitted in and around the motor which is costly and delicate which interrupt the operation [11], besides these methods are also invasive. Due to power frequency leakage, side band harmonics or harmonics close to fundamental supply frequency are completely masked because of low amplitude, specially for small /medium power motor operating at light load or no load.…”

Section: Dynamic Unbalancementioning

confidence: 99%

Identification of Mass - Unbalance in Rotor of an Induction Motor Through Envelope Analysis of Motor Starting Current at no Load

Ahamed¹,

Mitra²,

Sengupta³

et al. 2012

JESTR

View full text Add to dashboard Cite

This paper developed a new technique for identification of mass-unbalance in rotor of an induction motor through envelope analysis using motor starting current at no-load The unbalanced magnetic pull due to centrifugal force developed produces excessive vibration in the rotor as well in the stator. This magnetic pull is very high at the starting which moves the rotor in the whole air gap, resulting changes in the air gap flux distribution in the stator and in the rotor. This induces voltage and generation of new signature pattern of motor current. The present method overcomes the difficulty of FFT analysis at steady state due to spectral leakage as the starting current is very high even at no load. Though DWT analysis is producing good results for transient motor starting current analysis, but selection of mother wavelet is not an easy task, if not proper, may introduce serious error. In the present improved method, the wavelet selection is not an important criteria. Envelope is the argument of the complex analytic signal which is obtained by using original motor current as the real and its Hilbert transform as the imaginary part. Since Envelope analysis works on narrow band instantaneous low frequencies, for which DWT was performed to extract low frequencies below 50 Hz. using higher order wavelet at higher level. Simultaneously this method has higher detectability and higher resolution and it can also deal with small data efficiently, so it can be used online as well as offline.. This method has been tested in a laboratory prototype.

show abstract

“…Their main advantages are the noninvasive investigation and the simplicity of implementation. The noninvasive evaluation of the motor healthy state is based on the property that any fault changes the magnetic field in the near vicinity of the machine [17][18][19][20][21][22][23]. In this context, this paper studies the influence of a broken bar fault and the rotor dynamic eccentricity in squirrel-cage induction motors.…”

Section: Introductionmentioning

confidence: 99%

Finite Element Analysis and Experimental Study of the Near-Magnetic Field for Detection of Rotor Faults in Induction Motors

Pusca¹,

Romary²,

Fireteanu³

et al. 2013

PIER B

View full text Add to dashboard Cite

Abstract-This paper deals with the finite element analysis and experimental study concerning the influence of the broken bar and rotor dynamic eccentricity faults on the magnetic field outside a squirrel-cage induction motor. The spatial distribution of the magnetic field, the time variation of the magnetic flux density at a point outside the machine and the time variation of the electromotive force delivered by a coil sensor are evaluated based on the finite element models of the healthy and faulty states of the motor. The increase of amplitude from the healthy to the faulty states of some low frequency harmonics measured in the near-magnetic field is emphasized. For broken bar fault, the increase of the amplitudes of specific harmonics of the coil sensor electromotive force, with frequency lower than 25 Hz, is experimentally confirmed.

show abstract

Simplified axial flux spectrum method to detect incipient stator inter-turn short-circuits in induction machine

Cited by 56 publications

References 4 publications

A Survey on Testing and Monitoring Methods for Stator Insulation Systems of Low-Voltage Induction Machines Focusing on Turn Insulation Problems

A Survey on Testing and Monitoring Methods for Stator Insulation Systems of Low-Voltage Induction Machines Focusing on Turn Insulation Problems

Identification of Mass - Unbalance in Rotor of an Induction Motor Through Envelope Analysis of Motor Starting Current at no Load

Finite Element Analysis and Experimental Study of the Near-Magnetic Field for Detection of Rotor Faults in Induction Motors

Contact Info

Product

Resources

About

Simplified axial flux spectrum method to detect incipient stator inter-turn short-circuits in induction machine

Cited by 56 publications

References 4 publications

A Survey on Testing and Monitoring Methods for Stator Insulation Systems of Low-Voltage Induction Machines Focusing on Turn Insulation Problems

A Survey on Testing and Monitoring Methods for Stator Insulation Systems of Low-Voltage Induction Machines Focusing on Turn Insulation Problems

Identification of Mass -­ Unbalance in Rotor of an Induction Motor Through Envelope Analysis of Motor Starting Current at no Load

Finite Element Analysis and Experimental Study of the Near-Magnetic Field for Detection of Rotor Faults in Induction Motors

Contact Info

Product

Resources

About

Identification of Mass - Unbalance in Rotor of an Induction Motor Through Envelope Analysis of Motor Starting Current at no Load