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The mathematical models of the induction machine (IM) developed on the basis of the experimental frequency-response characteristics at standstill condition (SSFR) are proposed in this paper. At zero speed the transfer function of (IM) is used to obtain an exact linear parametric model. The latter ones are recommended for investigating the transient processes occurring at connections of (IM) to the...
The paper presents thermal studies of three-phase induction motor during steady-state and transient regimes using Motor-CAD environment. The graphical interfaces for data input (motor geometry, materials properties) are also shown. The supposed duty cycles are S1, S2, and S3 (continuous, short-time and intermittent periodic duty respectively). As output data the temperatures for various motor parts...
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.
Control systems for the induction motor fed by current source converter based on a multiscalar models are presented in this paper. The topology of current source inverter is shown. Equations of multiscalar model of the induction motor are derived. The multiscalar model is the new approach to the control of induction motor based on DC-link current and rotor flux vector. The speed observer system is...
Sensorless control of ac machines which is able to work even at zero speed can be realized using high frequency excitation. Different schemes have been presented recently, which use transient excitation caused by the switching of the voltage source inverter. Transient excitations of only one pair of test vectors are applied for each measurement in this paper. The signals resulting from transient excitation...
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...
This paper is introducing a fast Matlab toolbox to analysis the transient behavior of three-phase electrical machinery (EM). The well known models with several differential equations of voltage and current in rotor reference frame along with the torque and speed equations is used in matrix form to model the EM such synchronous machine, induction machine and DC machine. In order to fast simulation...
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