Boonkhun, Churirat

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Preferred name
Boonkhun, Churirat
Alternative Name
Boonkhun, Churirut
Main Affiliation
Email
churirat.bo@kmitl.ac.th

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    Item type:Publication,
    Research of Magnetic and Electric Fields to Design and Develop the Prototype of Magnetic Resonance Imaging Device
    (2025-01-01)
    Chompoo-Inwai, Chai
    ;
    Chompoo-Inwai, Chow
    ;
    Suksathit, Witchayaphorn
    ;
    Kaewpromrat, Weerapat
    ;
    Maneerat, Saranyu
    This research presents a study and preliminary design of a main magnetic field generation system for an MRI machine using simulation software. The objective is to investigate the factors affecting magnetic field strength. Six coil models were preliminarily designed and simulated to analyze the magnetic field behavior. Simulation results were compared with experimental magnetic field measurements, showing that the software accurately reproduces the magnetic field. It was found that distributed winding improves field uniformity, and that both the number of coil turns and conductor size directly affect the strength of the main magnetic field in the air core.Based on the simulation outcomes, a prototype magnetic field generation system was designed. The proposed prototype consists of an aluminum core with a diameter of 110 mm and a height of 335 mm, suitable for arm imaging. The system uses a superconducting NbTi wire wound 6,516 turns in eight segments, with a current of 120 A. Cooling is achieved using a cryocooler model RDE-418D4 4K, which can reach temperatures as low as 4.2 K. This study provides essential guidance for the development of main magnetic field systems in future MRI devices.
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    The Impact Study of Electrical Vehicle Charging Stations Loading to Thailand’s Northeast Power System and DRG Integration Planning to Reduce Power Congestion
    (2023-01-01)
    Wannoi, Narumon
    ;
    Wannoi, Chaisit
    ;
    Chompooin-inwai, Chai
    ;
    Jirasuwankul, Nirudh
    ;
    Boonkhun, Churirat
    This article presents the impact study of electrical vehicle charging stations (EVCS) loading to the Thailand’s North eastern power system. Main purposes of this paper are to find the maximum number of EVCS that can be loaded to power system and to rank the critical areas under EVCS load changing by using the repeated power flow calculation technique. Results from the calculation are for the integration planning of distributed renewable generators (DRG) to reduce system congestion. Typically, the critical areas are buses or devices that violate of system control limits. The system control limits are consisting voltage limit and load percentage limit of power transfer devices. All critical areas are needed to improve system stability and reduce system congestion for support the EVCS growing. In this study, The EVCS have been installed on main roads in Thailand’s North-eastern area from Bangkok to Nong-Khai province with a length of 624 km. The EVCS were installed every 50 km, totally 11 stations, and connected to 115 kV substations in the system. The impact study results found that the system experienced with congestion problem on following elements: a) 11 critical buses at 115kV network, b) one critical bus at 230kV network and c) one transmission line is overload to 100 percent at 115kV network when each of EVCS station load increase to 30 MW. In addition, study results reveal that when installed DRG at the right and proper locations, these can reduce congestions situation, reduce system losses and enhance system stability
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    Performance Analysis and Fault Classification in a Large Electric Motor Using Vibration Assessment Technique
    (2021-01-01)
    Suechoey, Boonlert
    ;
    Siriporananon, Somsak
    ;
    Chupun, Pana
    ;
    Boonkhun, Churirat
    ;
    Chompooinwai, Chai
    This research paper presents an analysis of electric motors performance by the assessment of vibration characteristics caused by bearing faults, housing bearing looseness and rotor unbalance. In this study, an analysis of fault that occurred in electric motor has followed ISO 10816-3 Standard. Bring the used electric motors for testing and measuring the vibration of the electric motors by using the Spectrum Analysis & Field Balancing Analyzer model ADASH A440-VA4 Pro. The vibration results of 22kW, 55kW and 75kW motor imply the malfunction of bearing faults, housing bearing looseness, and rotor unbalance. The results obtained from the analysis will be used as references and guidelines for predictions of faults in the electric motors, including maintenance scheduling of electric motors.