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Author: search.filters.author.Kinnares, V.Subject: search.filters.subject.PWM

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    A simple and low cost of delta modulator for static PWM inverter
    (2004-12-01)
    Choochuan, C.
    ;
    Kinnares, V.
    ;
    Pirajnanchai, V.
    The problem of switching frequency over the fundamental period of the modulation signal in fixed band delta modulation is improved by adding a triangular carrier wave to the sinusoidal reference and forcing the integrator output to follow the sum of these two signals is proposed in this paper. The proposed method is applied to the voltage source inverters for variable-speed three-phase induction motor drives applications(VSD).
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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.