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In this paper there is presented a method for analyzing dynamic regimes of asynchronous machines, by using the equations with saturation, which have the stator current and the rotor flux as state variables. In the first part, this mathematical model is detailed. There are presented below a series of simulations obtained by means of some Matlab programs carried out starting from this model. The simulations...
An universal structure of the speed observer is proposed for induction machines. The speed observer is based on extended model of induction machine, in which additional variables are added to a set of state variables. Properties of the proposed observer are presented using simulations of full control systems for the induction machine and experimental results.
In this study the cage faults occurred by the broken rotor bars are investigated for small and medium power asynchronous motors. The Flux 2D magnetic analysis software is used for calculating the magnetic and operating parameters of an induction motor having a cage fault. Magnetic analysis is conducted for the normal rotor, the rotor with single broken bar, the rotor with two, three and four broken...
The diagnosis of rotor asymmetries in induction machines through the use of methods based on the study of the startup current has become an issue of special interest. These techniques may provide, in certain situations (unbalance supply voltages, load torque oscillations...), substantial advantages in comparison with the classical method, based on the Fourier spectrum of the steady-state current....
This paper refers to the teaching of electromagnetic structure of induction machine, of steady state characteristics and of dynamic and transient machine behaviors based on finite element models and analysis of simulation results. Magnetoharmonic and transient models are used to solve field-circuit, respectively field-circuit-rotating motion problems.
Induction motor required continuous running frequently comes with reclosing process due to interrupted supply in power frequency. However, large current and torque of the motor incidentally appear in the process. The paper firstly analyzes reclosing dynamic process of induction machine at the time of the absence supply and presence stator residual voltage. Then, the calculation model of stator residual...
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