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Author: search.filters.author.Thammarat, C.Subject: search.filters.subject.PWM Inverter

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    An analysis of iron loss supplied by sinusoidal, square wave, bipolar PWM inverter and unipolar PWM inverter
    (2007-12-01)
    Khluabwannarat, P.
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    Thammarat, C.
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    Tadsuan, S.
    ;
    Bunjongjit, S.
    This paper presents a comparison of iron loss with sinusoidal supply (50 Hz) 1-phase square wave inverter supply 1-phase bipolar PWM inverter and 1-phase unipolar PWM inverter. In the experiment, using 0.5 mm.-thick Non-oriented magnetic steel and by setting equal maximum fundamental magnetic density for each test procedure, with 0.3, 0.45, 0.6, 0.9-modulation indexes and 1, 3 kHz. -inverter switching frequencies results show that the iron loss by 1-phase PWM inverter supply is less than other inverters, so this study is useful for selecting the PWM inverter with a lower iron loss. © 2007 RPS.
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    Single phase and three phase PWM inverter supply optimum selection for core losses reduction
    (2006-12-01)
    Suechoey, B.
    ;
    Thammarat, C.
    ;
    Tadsuan, S.
    ;
    Leelajindakrairerk, M.
    This paper presents the comparison of core loss with 1-phase bipolar inverter supply to 3-phase inverter supply (2- line). In the experiment, by using 0.30 mm.-thick grain oriented magnetic steel(M5) and by setting equal maximum magnetic density for each test procedure, with 0.3, 0.6, 0.9- modulation index and 1, 2, 3, 4, 5 kHz.- inverter switching frequency, the voltage and current are saved to data file. By using the function FFT program to analyze the data file, the test results shown that the core loss by 3-phase inverter supply (2-line) is less than that by 1-phase bipolar inverter supply, so this study is useful for selecting the PWM inverter to get the lower core loss.
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    Core loss prediction mathematical model design with single phase PWM inverter supply
    (2006-12-01)
    Suechoey, B.
    ;
    Thammarat, C.
    ;
    Tadsuan, S.
    ;
    Bunjongjit, S.
    This paper presents the core loss mathematical model design and the prediction of core loss with PMW Inverter supply. In the procedure, the 1-phase bipolar PWM inverter supply is used to supply the Epstein test apparatus with the 0.23 mm., 0.27 mm., 0.30 mm.-thick sheet, grain oriented magnetic steel, and 0.5 mm.-thick sheet, Non oriented magnetic steel. By setting the equal maximum magnetic density for each test procedure, with 0.3, 0.6, 0.9- modulation index and 1-9 kHz inverter switching frequency, the test results are shown that the core loss by the prediction is nearly the same that by the experiment, with 0.3, 0.6, 0.9- modulation index, so this mathematical model design is more useful and can be applied to the design work in electrical machine equipment.