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In direct-drive electric propulsion systems, where there is no reduction gear to minimize and absorb the adverse effects due to cogging torque generated by the permanent magnet (PM) machine, minimization of cogging torque generation is of particular importance. In this paper, a novel axial magnet pole pairing method is proposed to minimize cogging torque generation in a special three-phase outer-rotor...
A novel twelve-stator-pole, twenty-two-rotor-pole (12/22) outer-rotor permanent-magnet flux-switching (PMFS) machine for electric propulsion in a lightweight electric vehicle is presented. Analytical equations are derived for the dimensioning of a 3-phase 5kW in-wheel motor. Optimisation techniques are employed to maximise the performance of the machine. The validity of the analytical equations is...
Cogging torque is a parasitic element that causes mechanical vibration, noise and undesirable starting effects in permanent magnet (PM) machines. Significant design efforts, therefore, are made to minimize cogging torque in high performance PM machines. In this paper, several cost effective displacement techniques are proposed for the design of axial-flux surface-mounted permanent-magnet (AFSMPM)...
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