Manop, Chalermchat

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Manop, Chalermchat
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Manop, C.
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Email
chalermchat.ma@kmitl.ac.th

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    A study of performance and comparison of VSI with improved current waveshape for three-phase rectifier
    (2008-10-30)
    Tangsiriworakul, Chanwit
    ;
    Manop, Chalermchat
    ;
    Rojviroon, Wanchanai
    ;
    Senavongse, Wongwit
    This paper studies and compares the efficiency of voltage source inverter with traditional 3-phase rectifier direct current circuit on the front end, with passive filter, and with improved current wave shape. The efficiency evaluation is tested using THD, power factor and under changing modulation index, switching frequency and changing load. There is also a comparison of the effect of delta modulation switching technique and SPWM method on direct current circuit. ©2008 IEEE.
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    Laboratory digital signal analysis with virtual spectrum analyzer
    (2005-12-01)
    Hengkietisak, Siriporn
    ;
    Tipyakanont, Surapol
    ;
    Tangsiriworakul, Chanwit
    ;
    Manop, Chalermchat
    ;
    Senavongse, Wongwit
    This paper present laboratory digital signal analysis with virtual spectrum analyzer which is created using LabVIEW program on digital oscilloscope TDS 5054. This research aims to develop a knowledge-base on digital signal analysis and the working of virtual instrumentation, a topic which is currently attracting wide interest due to its many good attributes including flexibility, modularity, and low cost. It also aims to make a good use of expensive digital oscilloscope TDS 5054. In this study, laboratory spectrum analysis is performed with variable sampling rate, effect of windows filter etc. The results are displayed by both time domain and frequency domain. There are samples of signal waveforms such as Sinusoidal Waveform, Square waveform, Six-step waveform, and PWM (pulse width modulation) waveform. These waveforms are important in the study of power electronics. The data are obtained using special module program to extract information from the digital oscilloscope. © 2005 IEEE.
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    A low cost prototype for testing stator winding shorted turns in 3-phase induction motors
    (2005-12-01)
    Manop, Chalermchat
    ;
    Senavongse, Wongwit
    ;
    Kinnares, Vijit
    ;
    Tangsiriworakul, Chanwit
    This paper presents a prototype of stator winding shorted turns detector for three-phase induction motors. The focus condition is turn-to-turn short circuit, because this condition is the initial problem. The diagnosis technique is detectable from the voltage sum of the three instantaneous line to star-point voltage. In the testing, the supply is sinusoidal waveform and the motor must be star connected with floating neutral. Before diagnosis, this instrument will also determine the level of supply voltage imbalance, if it is over the limit, the test instrument will not diagnose shorted turns. From experimental results, 3-hp and 5-hp induction motors were used for testing this equipment which is capable of accurately identifying percentage of stator winding shorted turns. © 2005 IEEE.