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Direct-drive permanent magnet (DDPM) generators have been widely adopted in the wind power applications due to the higher reliability, and lower maintenance cost, compared to that of the doubly fed induction generators (DFIG) with the gearbox [1]. However, the magnets are vulnerable to be demagnetized under the short circuit condition. Due to the reliability concerns, the demagnetization performance...
Large-scale superconducting direct-drive (SCDD) generators have received lots of attention in recent years, featuring high torque density, efficiency and reliability [1]. Due to the application of SC field windings, airgap flux density is large and often more than 2 Tesla (no more than 1 T in traditional machines), which could result in huge electromagnetic radial forces and vibrations in SCDD generators...
For the complex structure of the large capacity turbo-generator in end region, the accurate calculation of the leakage magnetic field became key factor in large generator design. Affected by the leakage magnetic field, there is a problem that the end stator ladder packets, copper screen, press plate has a local high temperature. The three-dimensional electromagnetic field of a 330 MW water-hydrogen-hydrogen...
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