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Detection and classification of faults in induction motor by means of motor current signature analysis and stray flux monitoring

100%

Ishkova I. , Vítek O.

tom R. 92, nr 4

166--170

In this paper the detection and classification of faults in induction motor using motor current signature analysis and monitoring of stray flux are presented. During the research motors with static, dynamic and mixed eccentricity were measured. The results were analyzed and compared with the data obtained from the simulated motor models. The behavior of sidebands of principal slot harmonics was examined. The results are presented in the form of graphs that illustrate the effectiveness and advantage of the method for diagnosis of the motor and detection of faults in it.

W artykule przedstawiono metodę detekcji I klasyfikacji defektów silników indukcyjnych na podstawie analizy prądu i strumienia rozprposzonego. Możliwe jest wykrywanie statycznych i dynamicznych ekcentryczności. Zmierzone parametry były porównywane z danymi otrzymanymi metoda symulacji.

Comparison of governing equations for lagrangian/eulerian approaches to engine modeling

80%

Macek J. , Polašek M. , Vítek O. , Hvėzda J.

Journal of KONES

2002

tom Vol. 9, No. 1-2

172-180

Differential equations of thermodynamic simulation in the form applicable to both Eulerian and Lagrangian ap-proaches. Linking conditions concerning numerical methods of finite volume methods. The danger of spurious transfer phenomena due to numerical approximation. The general set of equations solved towards derivatives in the Lagrangian approach. Application to a quasi-D model for the flame propagation. Direct and indirect tasks – simu-lation of in-cylinder parameters for known flame parameters or for evaluation of relative flame propagation veloc-ity from measured ROHR and flame front position. Assessment of geometry for both zones (volumes, surfaces) in a general 3-D shape of a combustion chamber using CAD system.