W. Sawaengsinkasikit

Adjustable energy control with ICBRM technique

This paper presents a control method for single-phase and three-phase AC voltage supply by mean of ICBRM variable energy control technique which provides suitable power supply feeding to load requirements, and also, improve the feeding efficiency resulting in increased energy saving. The Integral Cycle Binary Rate Modulation (ICBRM) signals are integral cycle compositions of 8-bit binary rate multiplier (BRM) and 50 Hz, three-phase AC voltage signals which are divided into 8 parts per cycle, so that 2040 patterns are provided for the single-phase and three-phase feeding applications. Experimental results shows that such methods can be properly implemented for lighting bulbs and three-phase induction motor with low energy loss. This mean that the technique provides high efficiency performance and conducts energy saving.

Asymmetrical two-phase induction motor speed controlled by multilevel inverter employing cascaded transformers

This research presented multilevel inverter using cascade transformers to supply the output voltage levels which are used to control speed of asymmetrical two-phase induction motor. Two sets of full bridge inverters and transformer with difference of number of turn ratio are combined to generate the voltage levels to supply each winding of asymmetrical two-phase induction motor. Triangular multicarrier sine pulse width modulation signal was generated by Arduino Due AT91SAM3X8E microcontroller and IC number IR2130 was used for power circuit. Multilevel inverter was presented to use a low level of input voltage as multilevel of output voltage is high that voltage stress on switches are reduced. The experiment shows the result of speed controlled by volt per hertz constant so as to be sure steady torque and PI method technique was used to closed-loop control.

Asymmetrical two-phase induction motor speed controlled with 4-leg voltage source inverter

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.

9-Level inverter for induction motor control

This article presents speed controlling for single phase induction motor. Principally, 9-level, diode-clamp inverter used to control voltages per frequency is widely used because of its high efficiency to control the motor. In this article, ARM7 model ADU7024 is used as microcontroller to generate eight pulse signals and send to the output voltage amplifier by co-connecting to the modulation module using IC 7408. The obtained output signals are combined to IOR 2130 to generate 15-volt output for driving each gate. The 9-level, diode-clamp is employed to control single-phase induction motor. Such method when was tested to 220-V, 1/3 Hp, 50 Hz motor shown that it could control the voltage per frequency properly. When using the 9-level, diode-clamp inverter controlled by modulation, the results shown that the output waveform were very similar to the sinusoidal wave comparing to the typical waveform, resulting to drive the load efficiently.

Multilevel regular-based binary multiplier for SPIM speed control

This paper presents multilevel regular-based binary multiplier switching method and parallel-full bridge inverter circuit for controlling speed of single-phase induction motor (SPIM). By constructing various types of 8 bit regular-based binary multiplier signal (RBM) modulated by single-phase multilevel signal, and then generating inverter output signal. This technique can improve the inverter output signals performance, which demonstrates in term of reduction of total harmonic distortion (THD) and lower-order harmonic when applying to control the motor, resulting to improve the motor efficiency and performance.

Programmable multi-frequency SPIM drive for suitable energy

Focuses on developing a methodology for control of speed of a single phase induction motor (SPIM) by using a binary rate multipliers (BRM) technique and a programmable multi-frequency technique (40-80 Hz) in order to control suitable energy supply to the motor. If voltage and current are known then power can be calculated by using the vector space method. The results (torque and speed) are fed back to two proportional-integral (PI) controllers in order to select BRM patterns that can be generated in up to 256 forms. Power factor at no load and full load is also increased. Thus, higher efficiency is achieved.

SPIM speed control by CBWM technique [single-phase induction motor]

A centroid-based binary weight multiplier (CBWM) switching technique was proposed, which is suitable for full-bridge inverter applications of single-phase induction motor (SPIM) speed control by using 8 bit CBWM to modulate a square single-phase waveform and produce a control signal pattern. This technique was evaluated, and its performance was compared with th existing binary rate multiplier switching technique. The performance evaluation and comparison examined the total harmonic distortion (THD), number of pulses per cycle of the inverter output waveform, and both apparent and reactive power. The objective of the new switching technique is to minimize the THD.