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Torque ripple is the parasitic element that causes mechanical vibration, acoustic noise and even latent operational failure in permanent magnet (PM) machines. Consequently, considerable design efforts should be made to minimize torque ripple of the machines for high performance applications. In this paper, one cost effective torque ripple reduction technique is proposed and investigated for an axial...
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...
An improved model for the back-electromagnetic-force (back-EMF) and cogging torque characteristics of a novel axial flux permanent magnet (AFPM) synchronous machine with a segmental laminated stator is presented. Based on a 3-D finite-element analysis (FEA) modeling approach that takes into the anisotropic properties of the machine's laminated cores, the proposed model provides superior performance...
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)...
This paper concerns the design and analysis of a 1 kW high speed air-cored surface mounted axial flux permanent magnet (AFPM) synchronous machine intended to be used in a man- portable power platform. With a double rotor and a slot-less stator structure, the machine is designed with a maximum speed of 50,000 rpm. Both analytical equations and three dimensional (3-D) electromagnetic finite element...
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