Wawan Purwanto, Risfendra, Donny Fernandez, Dwi Sudarno Putra, and Toto Sugiarto, “DESIGN AND COMPARISON OF FIVE TOPOLOGIES ROTOR PERMANENT MAGNET SYNCHRONOUS MOTOR FOR HIGH- SPEED SPINDLE APPLICATIONS ”, INTERNATIONAL JOURNAL OF GEOMATE, vol. 13, no. 40, pp. 148–154, Nov. 2017.