Cholahan, V., & Charoensiri , Y. (2026). Voltage/Frequency Speed Control of CNC Machining Center’s Spindles Retrofitted by Delta ASD-S 4.5kW High Performance VFD. Industrial Technology Valaya Alongkorn Journal, 2(1), 1–13. retrieved from https://ph03.tci-thaijo.org/index.php/itec-journal/article/view/4702