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Influence of Third Space Harmonic on Properties of Five-Phase Induction Machine
Schreier, Luděk ; Chomát, Miroslav ; Bendl, Jiří
The paper deals with the necessity to consider higher space harmonic waves of a current layer, magnetic flux density and yoke flux in a five-phase induction motor fed from a tenpulse frequency converter. It is shown that especially the third space harmonic influences currents and torque of the machina considerably. The influence depends on connection arrangements of the converter and stator of the five-phase induction machine. Theoretical results are verified by experimental measurements.
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Induction Machine Operation Mode Type Effect Onto The Losses
Skalka, Miroslav ; Schreier, Luděk ; Janda, M. ; Ondrůšek, Č.
This paper deals with analysis of losses behavior of Induction Machine for both operation mode types (motor/generator). The purpose of this work is the definition of eqiuvalent circuit parameters and theirs non-linear behavior depending on various factors - slip, mechanical torque, temperature. In this paper would be presented behavior of iron losses and joule losses of rotor and stator with specific parameters behavior. The whole analysis is done in ANSYS (by FEM) and MATLAB program.
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Příspěvek k analýze asynchronního stroje se dvěma třífázovými statorovými vinutími
Schreier, Luděk ; Bendl, Jiří ; Chomát, Miroslav ; Skalka, Miroslav
This paper analyses situation in induction machines with two three-phase windings on the stator fed by two totally independent voltage sources. To analyze the situation in these machines, the method of space vectors has been used. The paper shows a mathematic description of such a machine based on a system of differential equations. The waveforms of currents and torque of the machine for various time shifts of voltages of both the feeding sources are shown. The results of the simulation show the necessity to exactly maintain the optimal time shift of both the voltages.
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Influence of Induction Machine Operation Mode Type Onto The Equivalent Circuit
Skalka, Miroslav ; Schreier, Luděk ; Janda, M. ; Ondrůšek, Č.
This paper deals with analysis of Induction Machine equivalent circuit parameters for both operation mode types (motor/generator). The purpose of this work is the definition of equivalent circuit parameters and theirs non-linear behavior depending on various factors - slip, mechanical torque, temperature. The temperature influence for longitudinal resistances is done - which means, the stator and rotor resistance value depends on passing current. At the end an electromagnetic field comparison for the same operation point in both operation mode types will be presented. The whole analysis is done in ANSYS (by FEM) and MATLAB program.
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Electromagnetic Field Calculation of IM for Different Equivalent Circuit Parameters
Skalka, Miroslav ; Schreier, Luděk ; Ondrůšek, Č.
This paper contains a calculation of electromagnetic field distribution of Induction machine for different equivalent circuit parameters due to the loads - each step is calculated for different rotor and stator currents. The definition of parameters and the real values of rotor and stator currents were presented on the XVI. Inter. Symposium on Electric Machinery in Prague. These data were used for a calculation of electromagnetic field distribution of Induction Machine (IM) by finite element method in ANSYS.
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Vliv vybraných parametrů na vlastnosti asynchronního generátoru
Schreier, Luděk ; Bendl, Jiří ; Chomát, Miroslav
The paper deals with the problems associated with the estimation of the magnetizing current in generator operation of induction machines. According to some experts, the magnetizing current in generator operation is considerably bigger than that in motor operation and this fact must be taken into consideration while designing the magnetic circuit. It is shown that this opinion is not justified in case of generators with output power about 30 kW and higher.
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Příspěvek k analýze ustáleného chodu asynchronního stroje
Schreier, Luděk ; Bendl, Jiří ; Chomát, Miroslav
The paper deals with the problems associated with the estimation of the magnetizing current in generator operation of induction machines. According to some experts, the magnetizing current in generator operation is considerably bigger than in motor operation and this fact must be taken into consideration while designing the magnetic circuit. It is shown that this opinion is not in many cases quite justified and thus it is not necessary to overrate the magnetic circuit and an induction machine originally designed as a motor can be used as a generator without derating.
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