A dual consequent pole variable flux Vernier machine for wide speed range

Article type: Research Article

Authors: Kwon, Jung-woo^a | Jun, Cha-seung^a | Kwon, Byung-il^a;

Affiliations: [a] Department of Electronic Systems Engineering, Hanyang University, Ansan, Korea

Correspondence: [*] Corresponding author: Byung-il Kwon, Department of Electronic Systems Engineering, Hanyang University, 55 Hanyangdeahak-ro, Sangnok-gu, Ansan, Gyeonggi-do, 15588, Korea. E-mail: [email protected]

Abstract: This paper proposes a variable-flux Vernier machine with dual consequent pole configuration to realize wide speed-range operation. The rotor has a consequent pole structure with high coercive force (HCF) material composed permanent magnets (PMs), whereas the stator has PMs positioned between the flux modulation poles. Stator-mounted PMs are made of low coercive force (LCF) materials that can be easily demagnetized or magnetized for variable-flux machines. By changing the magnetization state of the LCF PMs, suppression of magnetic flux was increased to reach higher-speed operation. Demagnetization of the stator LCF PMs reduced the total magnetic flux to reach a higher speed range. In addition, reverse magnetization allowed the machine to achieve further speed-range enhancement. The proposed machine was improved with a parametric selection process. Machine performance of each magnetization state was analyzed by way of speed torque curves and efficiency maps.

Keywords: Consequent pole, variable flux, Vernier machine, wide speed range

DOI: 10.3233/JAE-171165

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 59, no. 3, pp. 903-912, 2019