M. Siregar, D. R. Wohon, and T. Nur, “A New Technique to Reduce the Cogging Torque of Integral Slot Number in Permanent Magnet Synchronous Machine”, Int. J. Adv. Sci. Eng. Inf. Technol., vol. 10, no. 4, pp. 1436–1443, Aug. 2020.