Non-invasive detection of rotor cage faults in inverter fed induction machines at no load and low speed

2009 ◽  
Author(s):  
Thomas M. Wolbank ◽  
Peter Nussbaumer ◽  
Hao Chen ◽  
Peter E. Macheiner
Keyword(s):  
Induction Machines ◽  
Low Speed ◽  
Non Invasive ◽  
Rotor Cage

Investigation Method of Transient Modes in Induction Machines with Rotor Cage Asymmetry

2016 ◽  
pp. 433-451
Author(s):  
Iliya Boguslawsky ◽  
Nikolay Korovkin ◽  
Masashi Hayakawa
Keyword(s):  
Induction Machines ◽  
Investigation Method ◽  
Rotor Cage

scholarly journals Reduced-Order Model of Rotor Cage in Multiphase Induction Machines: Application on the Prediction of Torque Pulsations

2020 ◽  
Vol 25 (1) ◽  
pp. 11 ◽  
Author(s):  
Abdelhak Mekahlia ◽  
Eric Semail ◽  
Franck Scuiller ◽  
Hussein Zahr
Keyword(s):  
Induction Machine ◽  
Induction Machines ◽  
Reduced Order Model ◽  
Order Model ◽  
Two Phase ◽  
Reduced Order ◽  
Three Phase ◽  
Torque Pulsations ◽  
Sinusoidal Current ◽  
Rotor Cage

For three-phase induction machines supplied by sinusoidal current, it is usual to model the n-bar squirrel-cage by an equivalent two-phase circuit. For a multiphase induction machine which can be supplied with different harmonics of current, the reduced-order model of the rotor must be more carefully chosen in order to predict the pulsations of torque. The proposed analysis allows to avoid a wrong design with non-sinusoidal magnetomotive forces. An analytical approach is proposed and confirmed by Finite-Element modelling at first for a three-phase induction machine and secondly for a five-phase induction machine.

Operation of an induction motor supplied by voltage with interharmonics

2018 ◽  
Vol 2 (1) ◽  
pp. 47-53 ◽  
Author(s):  
Tomasz Drabek
Keyword(s):  
Induction Motor ◽  
Fundamental Frequency ◽  
Skin Effect ◽  
Induction Machines ◽  
Positive Sequence ◽  
Rotor Speed ◽  
Negative Sequence ◽  
Three Phase ◽  
Total Multiplicity ◽  
Rotor Cage

The paper discusses the effects of interharmonics, i.e. frequencies higher than the fundamental frequency, not being its total multiplicity, in the voltage supplying the induction motor. The emergence of interharmonics in a three-phase grid is mainly the result of the swinging of peak mains voltages. In induction machines, this results in the occurrence of currents with interharmonic and subharmonic frequencies, the generation of alternating moments, the swinging of the rotor speed and the change in the RMS value of the current of the fundamental frequency. The paper explores these phenomena simulation, taking into account the skin effect of currents in the rotor cage. The research was carried out both for interharmonics with a positive sequence of phases as well as for the negative sequence. The paper is a continuation of work [1].

Inertia identification for the speed observer of the low speed control of induction machines

1996 ◽  
Vol 32 (6) ◽  
pp. 1371-1379 ◽  
Author(s):  
Nam-Joon Kim ◽  
Hee-Sung Moon ◽  
Dong-Seok Hyun
Keyword(s):  
Speed Control ◽  
Induction Machines ◽  
Low Speed

scholarly journals Detection of Mechanical Abnormalities in Induction Motors by Electric Measurements

1999 ◽  
Vol 5 (1) ◽  
pp. 41-52 ◽  
Author(s):  
Andrzej M. Trzynadlowski
Keyword(s):  
Induction Motors ◽  
Input Power ◽  
Motor Drives ◽  
Operating Conditions ◽  
Induction Motor Drives ◽  
Non Invasive ◽  
Stator Current ◽  
Rotor Imbalance ◽  
Rotor Cage ◽  
Invasive Diagnostics

The paper gives an overview of the issues and means of detection of mechanical abnormalities in induction motors by electric measurements. If undetected and untreated, the worn or damaged bearings, rotor imbalance and eccentricity, broken bars of the rotor cage, and torsional and lateral vibration lead to roughly a half of all failures of induction motor drives. The detection of abnormalities is based on the fact that they cause periodic disturbance of motor variables, such as the speed, torque, current, and magnetic flux. Thus, spectral analysis of those or related quantities may yield a warning about an incipient failure of the drive system. Although the traditional non-invasive diagnostics has mostly been based on the signature analysis of the stator current, other media can also be employed. In particular, the partial instantaneous input power is shown, theoretically and experimentally, to offer distinct advantages under noisy operating conditions. Use of torque and flux estimates is also discussed.

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