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Description
This paper presents the research work for a novel dual-stator composite-rotor synchronous machine (DSCRSM). Ferrite permanent magnets (PMs) are used for the composite rotor with flux barriers, while the axis of each PM pole is located as 45 degree (electrical) with respect of the axis of the corresponding flux barrier. Compared with the conventional permanent magnet-assisted synchronous reluctance machine (PMASynRM), the proposed DSCRSM is capable to provide a higher output torque when the same amount of ferrite magnets consumed. The electromagnetic torque of the DSCRSM is consisted of two components, namely, magnetic and reluctance torques. The superiority of the DSCRSM is obtained by the utilization of a composite rotor that is capable of full use of torque components, as both magnetic and reluctance torques can reach their maximum values near or at the same current phase angle. To evaluate the contribution, Finite element method (FEM) is utilized in this study to investigate the torque and torque components for both PMASynRM and DSCRSM, while the two machines consume the same amount of ferrite magnets. Compared with the referenced PMASynRM, the maximum output torque of the proposed DSCRSM is increased by 19.6%. Moreover, torque ripple of the developed DSCRSM is also obviously reduced. Therefore, the proposed DSCRSM exhibits higher average output torque with lower torque ripple when compared with the conventional PMASynRM consuming the same amount of ferrite magnets. Machine performances, including electromotive forces (EMFs), power losses and efficiencies of both machines are also further researched and compared in this study. Eight composite rotor topologies with different flux barrier configurations are analyzed and compared, and the desirable rotor design is obtained with the least torque ripple for DSCRSM.
