The paper presents a new approach in the analysis of a transient state in a system where the feeding source is a transducer-IGBT inverter and load is introduced through the induction motor with itsR-Lparameters. Induction motors with different parameters of powers and power factors are tested. MATLAB simulation of the three-phase inverter that feeds the induction machine has replaced the missing lab equipment with which mathematical model of this system was verified. According to the selected parameters of the inverter and induction machine and through the simulation in the MATLAB program, the results are obtained in the form of diagrams that verify the model of a transient state of the induction machine operation when it operates as a motor which is presented as a variableR-Lload. The transient process of the system three-phase bridge inverter whose active-inductive load is the induction machine in the conditions of the change of the load parameters is analyzed. The model of the transient process in the system formed by the inverter in PWM (Pulse Width Modulation) converter and induction machine is developed in the time domain and phase coordinates.
Abstract-The paper we presents mathematical model for analysis of transitional processes in three-phase induction motor, that is, wave forms of currents and voltages in time domain and phase coordinates. Model is suitable for relay protection of the motor from disturbances and for estimation of electrical energy quality in the distribution network. New constructions of induction motors present more progressive technical solutions comparing with classical variants and reliable entity only within selected system of protection from expected disturbances (failures and disorders followed by asymmetries). Measuring process is not required due to application of simulation in selected MATLAB package.
This paper presents a study on structural changes occurring in a rapidly quenched metastable AlSilO M g alloy during heating cycles within the temperature range from room temperature to 800 K. M easurement o f electrical resistivity o f a ribbon show ed that structural stabilization takes place at temperatures ranging from 450 K to 650 K. The isotherms o f the electrical resistivity measured at temperatures 473 K, 483 K and 498 K revealed two stages o f structural stabilization i.e. a kinetic process and diffusion process. Measurement o f the thermoelectromotive force o f the thermocouple made from the investigated alloy and a copper conductor by a mechanical jo in in g was used to determine relative changes in the electron density o f states o f the quenched sample after successive heat treatments.The sam e alloy sample was subjected to successive heat treatments a t temperatures up to 503 K, 643 K, 683 K and 763 K. The change in the thermopower suggested that each heating was fo llo w ed by an increase in free electron density in the alloy. Therefore, the abrupt decline in electrical resistivity was induced by an increase in both the mean free electron path and fre e electron density during the thermal stabilization o f the structure.
The structural transformations of the Fe81B13Si4C2 amorphous alloy under nonisothermal as well as under isothermal conditions were studied. The amorphous alloy was stable up to a temperature of about 450ºC when the structural transformations began. The primary crystallization starts by forming Fe3Si as main phase (more than 80 wt %), and two minor phases Fe2B and Fe3B. With the increase of the temperature the phase composition as well as ratio of present phases is changed and above 600oC it was confirmed the presence only two stable phases, Fe3Si and Fe2B. It was shown that all observed structural transformations have significant influence on the electric and magnetic properties of alloy. The electric resistivity of the crystallized alloy is lower than the amorphous one. The crystallized alloy possesses better magnetic susceptibility and retains the ferromagnetic properties in whole investigated temperature range
Preliminary communicationIn this paper a fundamental mathematical model (algorithm) for determination of condition of induction machine as well as the simulation procedure for measurement of certain values in program MATLAB has been presented. A scheme of measuring system and results of simulation application are presented on output lists. Thus, measuring system gradually develops and improves as combination of information and results of previous steps in modeling with new elements essential for development of researches when induction machine is fed through PWM inverter. Keywords: algorithm; induction machine; inverter; measurement; simulation Simuliranje utjecaja viših harmonika na prijelazni proces indukcionog stroja napajanog iz PWM inverteraPrethodno priopćenje U radu je prikazan osnovni matematički model (algoritam) za određivanje stanja indukcionog stroja kao i postupak simulacije mjerenja pojedinih vrijednosti u programu MATLAB. Na izlaznim listama prikazana je shema mjernog sustava i rezultati primjene simulacije. Na taj način se mjerni sustav postupno razvija i usavršava kao kombinacija informacija i rezultata prethodnih koraka u modeliranju s novim elementima značajnim za razvoj dijagnostičkog sustava kada se indukcioni stroj napaja pomoću PWMinvertera.
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