Abstract
This paper studies the effect of rotor structure on the electromagnetic performances of a dual-rotor single-stator (DRSS) axial flux permanent magnet (AFPM) machine with segmented stator and concentrated winding. Consequent-pole PM (CPM) and Halbach array PM (HPM) are introduced in the rotor structure to improve the PM material utilization ratio and output torque, and the sensitivity analysis of some rotor geometrical structural parameters that have significant impact on the key performances is conducted. For the AFPM machine with SPM, CPM, CP-HPM and CP-IPM, several key electromagnetic characteristics including open-circuit airgap flux density, back-EMF, average torque, torque ripple, PM eddy current loss and PM demagnetization are compared under the same operating condition by using the finite-element method. It is demonstrated that compared with SPM, the AFPM with CPM has significant advantages in PM utilization and loss, although its performance in terms of torque and PM demagnetization is slightly sacrificed.
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