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Author: search.filters.author.Sawaengsinkasikit, W.Subject: search.filters.subject.PI

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    Asymmetrical two-phase induction motor speed controlled with 4-leg voltage source inverter
    (2015-09-28)
    Kaenthong, K.
    ;
    Tipsuwanporn, V.
    ;
    Numsomran, A.
    ;
    Sawaengsinkasikit, W.
    This research is design and construct of Sine Pulse Width Modulation (SPWM) 4-leg voltage source inverter for controlling speed of asymmetrical two-phase induction motor. The Sine PWM switching signal is generated by ARM7 (Adu7024) microcontroller which is programmable and cheap, while having high frequency to generating switching signal. Two ICs No. IR2130 are used for motor driving part. The characteristics of output current signal are nearly closed to sinusoidal pattern resulting to high efficiency for motor control. In order to control the speed of induction motor, ratios of voltage to frequency (V/f) are controlled and constant torques are obtained by implementing technique of PI close-loop control.
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    New fine adjustment technique for heating process
    (2000-01-01)
    Tipsuwanporn, V.
    ;
    Jamjan, K.
    ;
    Piyarat, W.
    ;
    Suesut, T.
    ;
    Tarasantisukand, C.
    This paper proposes controlling of temperature in an oven by using Integral - Cycle Binary Rate Modulation (ICBRM method and ac line with frequency 50 Hz, Microcontroller MCS-51 controls Binary Rate Multiplier ( B M according to Proportional Integral controller (Po function . Discrete signals are used in the system modeled by using Ziegler Nichols principle for analyzing the stability before designing the system. This procedure makes it easy to investigate system response. The system is implemented by 8 bits digital circuit which gives 1024 patterns of ac signal for controlling the generation of energy for 3,000 watts thermal coil every 20 ms of each cycle. We divide scan time (Tsn) in to 4 intervals, 5 ms interval is selected to generate 256 patterns ICBM. Because of this method gives the ripple lower than 2% it generates less noise for system. Moreover, we can consider whole system from the time model of control procedure and ICBM algorithm40-200 OC with f I OC error in the I cubic meter oven.