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The paper presents an induction machine enhanced mathematical model, which uses frequency dependent electrical parameters. The program has been implemented using Matlab-Simulink software, by creating a new simulation block that has added electrical and mechanical parameters, as input data. Electrical parameters are determined by no-load and shortcircuit tests run at different frequencies, while mechanical...
The paper presents a functional analysis of a singlephase inverter of mid-range power and its optimization based on three performance criteria. The studied inverter is an IMD (Inverter Mono-Phase Digital) with a bridge of IGBT transistors used for supplying vital consumers for guiding, control and safety of railway transport. The inverter operation is analyzed under different load situations together...
This paper presents an analysis of the influence that variations of the geometrical parameters of a Permanent Magnet Synchronous Generator (PMSG) have on the values of the cogging torque and induced electromotive force (emf). The following parameters were varied for this study: stator teeth width, stator slots isthmus width, length of permanent magnets pole arc and rotor yoke width. The effects of...
The paper presents a study of heating for induction machine, using the theory of the two thermal bodies. This theory gives good results for low power machines. The differential equations of heat are discussed and a simple thermal equivalent circuit is proposed for the machine. From the experimental tests, the equation of heating in the theory of the two thermal bodies is determined for the induction...
New developments in ultralow power electronic devices can now use much solution to energy harvesting systems designed to interface directly with a piezoelectric transducer. However, these environmental energy sources are typically very low power. Recently, a significant number of piezoelectric devices based on lead titanate zirconate (PZTN) have been designed with the purpose of the piezoelectric...
The paper presents an experimental determination of the parameters of the mathematical model of the induction machine, taking into account magnetic saturation and skin effect. The magnetization inductance, the differential magnetization inductance, and the resistances and leakage inductances of the multi-shunt circuits which simulate the skin effect in the rotor, are determined. The induction machine...
The paper presents an experimental procedure for determining the moment of inertia and mechanical losses versus speed characteristic, in electrical machines. The experiment uses the retardation test and a Matlab/Simulink algorithm for computing the deceleration curve.
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