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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.
    ;
    Thammarat, C.
    ;
    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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    Comparision of power loss of three-phase induction motor of four techniques with PWM inverter supply
    (2007-12-01)
    Tadsuan, S.
    ;
    Suechoey, B.
    ;
    Saelee, V.
    ;
    Chompoo-Inwai, C.
    The purpose of this research is to study the power loss in three-phase induction motors linked with a three-phase PWM inverter by adjusting various fundamental wave voltages of the motors. The experimental procedures used four adjustment techniques as: 1. Constant DC link voltage inverter and adjusting the modulation amplitude 2. Constant modulation amplitude equal 1 and adjusting DC link voltage of inverter 3. Sixstep inverter and 4. Constant modulation amplitude equal 2.3 (over mod land adjusting DC link voltage of inverter. The four techniques were used to adjust V/f-type fundamental waves. The results indicated that the adjustment technique showing the power input, power output, power loss and efficiency of the motor. © 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.
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    PWM-CAD1: An interactive and efficient PWM inverter training kit
    (2000-01-01)
    Kaitwanidvilai, S.
    ;
    Khan-Ngern, W.
    In this paper, the presentation of inverter performance in visual, Matlab with Simulink program and EPROM digital control circuit are used as the computer aided training, simulation and designation which called as PWM-CAD1 kit. The presentation shows the circuit, waveform, mathematics equations of waveform, and inverter performance of switching patterns in the both of simulation and practical results included in PWM-CAD1. The important point of this kit for education is that the students can interactively modify overall necessary parameter of inverter design. The all output properties and waveform are clearly shown both of simulation results and practical waveform on the inverter circuit in the kit. Finally, this kit will be used as an interactive tool that arranged in good way for learning, designation and simulation.