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Active magnetic bearings can not only solve the bearing wear and life problems but also reduce the loss and noise of bearings, which makes it more and more popular in the use of high speed motor. In this paper, the design procedure and control method are presented for four-axis magnetic bearings designed for a 200kW/40000rpm high speed motor. The working principle and actuator model of magnetic bearings...
As wind turbines increase their power rating, their size and mass increase as well. Therefore, the higher reliability is needed in order to minimize maintenance. Direct-drive PM (DDPM) generators are a good solution to this problem because they omit the gearbox. The large generator mass has been also a difficult problem limiting the practical use of DDPM generators, which makes them difficult to build,...
This paper deeply discusses the effect of eccentricity, including static, dynamic and mixed eccentricity on the performance of FSCW SPM servo motor analytically and using finite element analysis (FEA) to validation. The effect of different kinds of eccentricity on magnetic field including magnet field and armature reaction field is described with three factor called modulation factor. The frequency...
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