Design and Research of Modular Multiphase Permanent Magnet Direct Drive Generator

Offshore wind power generation is the main development direction of wind power industry in the future. This paper mainly studies on the modularization and lightweight of offshore permanent magnet direct drive Wind Turbines. Compared with traditional double three phase generator, polyphase generator has obvious advantages such as strong fault tolerance, higher torque density, smaller torque ripple, higher efficiency, etc. Based on the design theory of multi-phase generator, the design scheme of modular 6-phase permanent magnet direct drive generator is proposed in this paper. Based on field-circuit coupling, the magnetic density, cogging torque and no-load voltage of 6-phase PM direct driven generator are calculated in this paper. Based on the fluid field analysis, the water-cooling scheme of the 6-phase permanent magnet direct drive generator is established to calculate the temperature rise distribution of the generator under high power density.