CHOLAHAN, V.; CHAROENSIRI , Y. Voltage/Frequency Speed Control of CNC Machining Center’s Spindles Retrofitted by Delta ASD-S 4.5kW High Performance VFD. วารสารเทคโนโลยีอุตสาหกรรม วไลยอลงกรณ์, [S. l.], v. 2, n. 1, p. 1–13, 2026. Disponível em: https://ph03.tci-thaijo.org/index.php/itec-journal/article/view/4702. Acesso em: 17 ก.ย. 2026.