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Lately, a new diagnostic mean has been introduced for reliable fault diagnosis in delta-connected induction motors. This diagnostic mean is the zero-sequence current frequency spectrum. It will be shown in this paper that, the zero-sequence current waveform can be reliably used for identifying the induction motor's iron core saturation level. So in this work, simulations with the Finite Element Method...
This paper presents an improved dynamic model with incorporating the saturation effects for an induction motor (IM). The improved model is simulated with MAT-LAB/SIMULINK software for transient response in terms of electromagnetic torque, rotor speed and stator current at no-load and on-load. The obtained simulated results provide a clear evidence that the conventional unsaturated model fails to predict...
This paper presents a 2-D nonlinear time-harmonic finite element model of induction motor for use in the accurate dynamic simulation. In the proposed model, it is not necessary to rotate the rotor, the resistivity of the rotor material is modified in terms of the specified load condition. The nonlinear properties are represented by using the effective magnetization curve. The field-coupled circuit...
Active thermal protection techniques have been proposed for the thermal protection of induction motors. By injecting dc signals, the dc model of induction motors can be used to estimate the stator winding resistance, and thus the average stator winding temperature. The injected dc signals may lead to magnetic saturation, which may degrade a motor's performance and increase heat dissipation in the...
This paper presents the use of the coupled electric circuit with two-dimensional finite element electromagnetic field analysis (FEA) for determining the parameters of two-axis model of a three-phase cage induction motor. The designed geometric dimension of induction motor is modelled in the finite element domain. Each rotor conductor is connected in parallel and a resistance and an inductance are...
This paper presents a new method to simulate the transient process of blocking up for induction motor. The transient field-circuit coupled model taking account of magnetic characters is combined with finite element (FE) method. The local magnetic saturation and hysteresis in the steel core is considered by combining time-stepping method with Preisach model. The inductances and resistances of end windings...
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