Journal ArticleDOI
Modeling of induction machines including stator and rotor slot effects
Subhasis Nandi
- Vol. 40, Iss: 4, pp 1058-1065
TLDR
In this paper, the authors investigated the effect of slot permeance on the production of principal slot harmonics (RSH) in three-phase and single-phase induction motors.Abstract:
Three-phase as well as single-phase induction machines form the backbone of a substantial portion of the adjustable-speed drives' applications. Among the current estimation techniques available for speed-sensorless induction motor drives, speed measurement based on rotor or principal slot harmonics (RSH or PSH) detection in machine line current happens to be a prominent one. In practice, two predominant RSH can be seen. The present paper attempts to investigate the effect of slot permeance on the production of RSH. Simulation studies on a small motor but with a popular stator, rotor slot, and pole combination suggest that their effect is less significant compared to rotor space harmonics effect. Also, out of the two aforementioned RSH, the cause of the less significant slot harmonic is shown to be the negative-sequence-current-induced reverse rotating field. Voltage unbalances and constructional imperfections can cause negative-sequence current even in a healthy machine. Thus, although the less significant RSH is absent in the simulated line current of an idealized machine running from a balanced supply, it can be detected in an actual machine.read more
Citations
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Journal ArticleDOI
Performance Analysis of a Three-Phase Induction Machine With Inclined Static Eccentricity
TL;DR: In this article, the authors investigated the performance of a three-phase induction machine with nonuniform static eccentricity along axial direction or inclined SE, and the relationship between the number of rotor bars and poles and the existence of fault-related current harmonics was discussed.
Journal ArticleDOI
Stator-Current Spectrum Signature of Healthy Cage Rotor Induction Machines
TL;DR: The objective of this paper is to make a clear and rigorous characterization and classification of the harmonics present in a healthy cage rotor induction motor spectrum as a starting point for diagnosis.
Journal ArticleDOI
Application of the Teager–Kaiser Energy Operator to the Fault Diagnosis of Induction Motors
Manuel Pineda-Sanchez,Ruben Puche-Panadero,Martin Riera-Guasp,J. Perez-Cruz,J. Roger-Folch,Joan Pons-Llinares,Vicente Climente-Alarcon,Jose A. Antonino-Daviu +7 more
TL;DR: In this article, a new method for demodulating the stator current prior to its spectral analysis is proposed, using the Teager-Kaiser energy operator, which is able to remove the mains component of the current with an extremely low usage of computer resources.
Journal ArticleDOI
An improved model of induction motors for diagnosis purposes – Slot skewing effect and air–gap eccentricity faults
TL;DR: In this article, an improved method for the modeling of axial and radial eccentricities in induction motors is described, based on an extension of the modified winding function approach (MWFA) which allows for all harmonics of the magnetomotive force (MMF) to be taken into account.
Journal ArticleDOI
Unified winding function approach for dynamic simulation of different kinds of eccentricity faults in cage induction machines
Jawad Faiz,Mansour Ojaghi +1 more
TL;DR: In this paper, the authors used a modified winding function theory to calculate the time-dependent inductances of an industrial induction motor with a general eccentricity fault, including static, dynamic and mixed eccentricities, in a unified manner.
References
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Book
Parameter Estimation, Condition Monitoring, and Diagnosis of Electrical Machines
TL;DR: In this article, the effects of time harmonics on various space-phasor loci, harmonic amplitude estimation Monitoring of the rotor speed and the rotor angle Monitoring various machine parameters Diagnosis, condition monitoring Bibliography Index
Journal ArticleDOI
Vibration and current monitoring for detecting airgap eccentricity in large induction motors
TL;DR: In this paper, a study carried out to detect air gap eccentricity in large 3-phase induction motors was carried out and the philosophy of using a unified online monitoring strategy was presented and the reasons for selecting line current and frame vibration as the monitored parameters are discussed.
Journal ArticleDOI
Detection of Rotor Slot and Other Eccentricity-Related Harmonics in a Three-Phase Induction Motor with Different Rotor Cages
TL;DR: In this article, the authors used coupled magnetic circuit simulation results for a four pole, three phase induction motor with 44, 43, and 42 rotor slots under healthy, static, dynamic and mixed eccentricity conditions.
Journal ArticleDOI
A novel method for modeling dynamic air-gap eccentricity in synchronous machines based on modified winding function theory
N.A. Al-Nuaim,Hamid A. Toliyat +1 more
TL;DR: In this paper, the effect of dynamic air-gap eccentricity on the inductances of a salient-pole synchronous machine using the modified winding function approach (MWFA) has been discussed.
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