EPE Association: EPE-PEMC 2002: Special Session: Diagnosis of Induction Motor

EPE-PEMC 2002: Special Session: Diagnosis of Induction Motor
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   A Method for the Simulation of Inter-Turn Short Circuits in Squirrel Cage Induction Machines
By E. Destobbeleer; G. Barakat; G. Houdouin; B. Dakyo [View]
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Abstract: This paper deals with an improved method enabling the simulation of inter-turn short circuits in the stator windings of induction machines. This method is based on the coupled magnetic circuit theory. The system of differential equations describing the induction machine in presence of inter turn short circuits in the stator windings is given. The calculation of the machine inductances is based on the integration of the magnetic energy density stored in the airgap. The airgap magnetic energy is determined by means of the winding functions method. The theoretical foundations of this airgap magnetic energy based calculation of the machine inductances are presented. In addition, the doubly slotted air-gap is taken into account by the use of a sophisticated airgap permeance analytical model derived from several finite elements simulations. Because of the inductances calculation is highly time consuming, a numerical representation method of the inductances is also proposed in order to avoid calculating inductances during the differential equations system integration. The proposed model allow the authors to study precisely the inter-turn short circuits signature in various machine quantities such as stator currents, torque, speed, etc. Finally, the simulation results of the proposed model are validated by means of a 4 kw specially rewound induction motor which is loaded by a DC generator.

   A robust steady state detection in electromechanical system diagnosis
By M. Artioli; F. Filippetti [View]
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Abstract: Some highlights will be given on two simple ideas to formulate light algorithm for some kinds of signal processing, like the detection of steady-state or other global condition of the signal. On one hand, these algorithms can be useful to find global characteristics as end point of the signal processing, on the other hand, they can be used as pre-processing techniques to simplify the job of other processing techniques that can be applied next.

   An Approach to Dynamic Simulation of Dynamic Eccentricity in Induction Machines
By G. M. Joksimovic [View]
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Abstract: The paper describes an approach based on winding function theory for the dynamic simulation of dynamic rotor eccentricity in cage rotor induction machines. It is shown that this complex dynamic regime could be modeled using the mutual inductance curves of symmetrical machine using proper scaling techniques.

   Detection of induction motors broken bars by electromagnetic torque estimation using kalman filtering
By M. Eltabach; A. Charara; I. Zein [View]
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Abstract: This work addresses the problem of failure prediction in line-operated three-phase induction machine using electromagnetic signals spectral analysis. We study the detection of rotor imperfection by spectral analysis of the electromagnetic torque computed by two rotor flux estimators. In the first approach, the Kalman filter is used assuming that the mechanical velocity is known. The second approach uses Extended Kalman Filter (EKF) for speed estimation. Simulation and experimental results show the robustness of the EKF and the great capability of these two methods to detect this type of faults.

   On Space Harmonics Model Of A Three Phase Squirrel Cage Induction Motor For Diagnosis Purpose
By A. Abed; H. Razik; G. Didier; A. Rezzoug [View]
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Abstract: This paper presents two models for the simulation of a squirrel cage induction motor including the first space harmonics. The first model uses the generalised Park’s transformation applied to the rotor which allows to have a low computing time. The second model takes into account all the parameters of the squirrel cage and requires a huge computational power. It improves the precision of the all induction motor simulated variables. These two models are tested when the asynchronous machine presents rotor defects of broken bar type. We will show that the generalised Park’s transformation applied to the rotor is less appropriate for the fault diagnosis. Indeed, the analysis by Fast Fourier Transform of the stator current does not show up the sidebands due to the space harmonics instead of the complete model. A comparison between the two models and the experimental results are carried out in order to show the influence of each one for the diagnosis of defect.

EPE-PEMC 2002: Special Session: Diagnosis of Induction Motor
You are here: EPE Documents > 04 - EPE-PEMC Conference Proceedings > EPE-PEMC 2002 - Conference > EPE-PEMC 2002: Special Session: Diagnosis of Induction Motor
	[return to parent folder]

	A Method for the Simulation of Inter-Turn Short Circuits in Squirrel Cage Induction Machines By E. Destobbeleer; G. Barakat; G. Houdouin; B. Dakyo	[View] [Download]
Abstract: This paper deals with an improved method enabling the simulation of inter-turn short circuits in the stator windings of induction machines. This method is based on the coupled magnetic circuit theory. The system of differential equations describing the induction machine in presence of inter turn short circuits in the stator windings is given. The calculation of the machine inductances is based on the integration of the magnetic energy density stored in the airgap. The airgap magnetic energy is determined by means of the winding functions method. The theoretical foundations of this airgap magnetic energy based calculation of the machine inductances are presented. In addition, the doubly slotted air-gap is taken into account by the use of a sophisticated airgap permeance analytical model derived from several finite elements simulations. Because of the inductances calculation is highly time consuming, a numerical representation method of the inductances is also proposed in order to avoid calculating inductances during the differential equations system integration. The proposed model allow the authors to study precisely the inter-turn short circuits signature in various machine quantities such as stator currents, torque, speed, etc. Finally, the simulation results of the proposed model are validated by means of a 4 kw specially rewound induction motor which is loaded by a DC generator.

	A robust steady state detection in electromechanical system diagnosis By M. Artioli; F. Filippetti	[View] [Download]
Abstract: Some highlights will be given on two simple ideas to formulate light algorithm for some kinds of signal processing, like the detection of steady-state or other global condition of the signal. On one hand, these algorithms can be useful to find global characteristics as end point of the signal processing, on the other hand, they can be used as pre-processing techniques to simplify the job of other processing techniques that can be applied next.

	An Approach to Dynamic Simulation of Dynamic Eccentricity in Induction Machines By G. M. Joksimovic	[View] [Download]
Abstract: The paper describes an approach based on winding function theory for the dynamic simulation of dynamic rotor eccentricity in cage rotor induction machines. It is shown that this complex dynamic regime could be modeled using the mutual inductance curves of symmetrical machine using proper scaling techniques.

	Detection of induction motors broken bars by electromagnetic torque estimation using kalman filtering By M. Eltabach; A. Charara; I. Zein	[View] [Download]
Abstract: This work addresses the problem of failure prediction in line-operated three-phase induction machine using electromagnetic signals spectral analysis. We study the detection of rotor imperfection by spectral analysis of the electromagnetic torque computed by two rotor flux estimators. In the first approach, the Kalman filter is used assuming that the mechanical velocity is known. The second approach uses Extended Kalman Filter (EKF) for speed estimation. Simulation and experimental results show the robustness of the EKF and the great capability of these two methods to detect this type of faults.

	On Space Harmonics Model Of A Three Phase Squirrel Cage Induction Motor For Diagnosis Purpose By A. Abed; H. Razik; G. Didier; A. Rezzoug	[View] [Download]
Abstract: This paper presents two models for the simulation of a squirrel cage induction motor including the first space harmonics. The first model uses the generalised Park’s transformation applied to the rotor which allows to have a low computing time. The second model takes into account all the parameters of the squirrel cage and requires a huge computational power. It improves the precision of the all induction motor simulated variables. These two models are tested when the asynchronous machine presents rotor defects of broken bar type. We will show that the generalised Park’s transformation applied to the rotor is less appropriate for the fault diagnosis. Indeed, the analysis by Fast Fourier Transform of the stator current does not show up the sidebands due to the space harmonics instead of the complete model. A comparison between the two models and the experimental results are carried out in order to show the influence of each one for the diagnosis of defect.