High-power Outer Rotor Permanent Magnet Direct Drive Wind Turbine Design And Optimization

Energy, the basic requirement of the human life, is also the material foundation to the national economical development, energy security is closely related to national economic stability. Wind power as a renewable, clean energy, has become an important form of energy for sustainable development. Wind turbines trend is Brushless and adoption without Gearbox direct drive low speed wind turbines, and the permanent magnet direct drive synchronous generator(PMDDSG) is a typical representative of the models.Outer rotor permanent magnet direct drive synchronous generator, its magnet, outer rotor and the original moving mechanical coupling as a whole, blade mounted directly on the engine base, to improve wind energy utilization. Compared with the inner rotor machine, outer rotor is easier to achieve multi-pole installation, the stator volume is reduced, enabling high efficiency low cost operation.For the outer rotor structure according to its own characteristics and high-power permanent magnet synchronous wind turbine design requirements, size of the generation stator and rotor, permanent magnet materials’s shape, electromagnetic load, poles/slots ratio, the selection of the armature winding, and so on, were studied and analyzed. Adopt equivalent magnetic circuit method based motor design software--RMxprt. to complete2MW outer rotor permanent magnet synchronous generator preliminary design. Parametric analysis and design with the magnetization direction of the permanent magnets and the stator axial length length, determine an optimal design. Build2MW outer rotor permanent magnet Synchronous generator2D model by used the finite element analysis software Maxwell2D,and had a detail analysis with its electromagnetic field. Were obtained in the static magnetic field with each phase winding inductance and calculated the transient Held generator no-load and rated load when running. Using field-circuit method studied and analyzed the different poles slots combination effect on the permanent magnet synchronous generator’s magnetic Held distribution and output characteristics.Finally, the manufacture of permanent magnet synchronous generator, permanent magnet materials, the major cost of a generator, controlling a permanent magnet material can effectively control the consumption of the manufacturing cost of the generator. Took stator groove, permanent magnet shape as variables, optimized2MW outer rotor permanent magnet synchronous generator effective material cost with genetic algorithms, simulation results show that the permanent magnet consumption and the total effective material generator manufacturing costs are fell by5.8%and3.3%.