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This paper presents finite element models for the study of heating of the squirrel-cage rotor of the induction machines during motor startup. The transient magnetic and the magnetoharmonic models of the induction machine are used in the studies of squirrel cage adiabatic heating and magnetothermal rotor heating. The multiphysics model, which rigorously reflects the transient heating of the rotor,...
In this paper, high-order fault-related current harmonics are used for the diagnosis and discrimination between two different faults in induction machines: rotor asymmetries and mixed eccentricities, both when only these faults are simultaneously present in the machine and when they are combined with other non-fault related phenomena. The idea is to track the evolutions of both the high-order fault-related...
The paper presents a mathematical model of large power induction motor. The purpose of the proposed model is an analysis of multi-motor system supplied by auxiliary electrical system of power plant. Non-linear model takes into consideration saturation effect and deep-bar effect. Apparent form of model equations simplifies the structure of algorithm and shortens time of calculations. The model keeps...
This paper presents a novel V/f controlled induction motor for improvement of speed characteristics. The proposed method is an auto-boost voltage method to compensate the voltage drop of stator impedance and a slip frequency compensation method to decrease the speed error caused by the change of load. The operating region of proposed method is discussed by using vector locus. The stability of the...
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