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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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    Influence of PWM characteristics on the core losses due to harmonic voltages in PWM fed induction motors
    (2000-01-01)
    Khomfoi, S.
    ;
    Kinnares, V.
    ;
    Viriya, P.
    The paper focuses on mechanisms of harmonic core losses due to PWM characteristics. The influence of PWM characteristics such as switching frequency, modulation depth and PWM strategy on core losses has been examined. The investigation into harmonic core losses based on no-load input power measurement with minimized rotor copper loss and rotational loss has been made. The experimental results show that the increment of core losses due to PWM harmonic voltages is significant compared to a sinusoidal supply and the modulation depth has significant effect on machine core losses.