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An axial flux permanent magnet (AFPM) machine with dual rotors and single air-cored stator is studied in this paper. The machine is applied for vertical-shaft small power off-grid wind generating system. A 2-dimensional (2D) finite element analysis (FEA) method is proposed to approximately solve to the 3-dimensional (3D) magnetic field inside the AFPM machine. And a 2D analytical method is also presented...
This study presents the investigation on the magnetic force phenomenon in permanent magnet (PM) wind turbine generators. Owing to the presence of PMs, the inherent and ever-existing magnetic force between the stator and rotor becomes one of the most critical phenomena in these generators. Whether it is during the assembly process throughout the manufacturing stages or when the generator is in operation,...
In small ratings, direct-driven wind power applications multiple permanent magnet generators have become very attractive. Connected directly to the turbine axis, this type of electrical machine contribute to low price energy (the energy loss is diminished through the conversion, the turbine performance is increased) and to the reduction of the noise - this would be a very important aspect in case...
The rotational loss is one of the most important problems in high-power flywheel energy storage system (FESS) which supplies the electrical energy from the mechanical rotation energy. In our FESS with PM synchronous motor/generator (PMSM/G) and non-contacting system, the rotational loss is mainly generated in the laminated iron stator when PM rotor mounted on the flywheel is rotated. Therefore, this...
This paper develops a model for torque pulsations simulation in a permanent magnet synchronous generator, due to the rotor's eccentricity. One pole of the machine is represented in finite element magnetic field analysis in order to define stator voltage time variations with the air-gap width. A circuit model is also developed in Matlab/Simulink environment enabling to account for rotor eccentricity...
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