Design And Research On Dual-Rotor Permanent-Magnet Wind Generator

Wind power as one of the most promising renewable energy technologies, it isattracted attention around the world. Compare to single rotor permanent magnetsynchronous wind generator, dual-rotor permanent-magnet synchronous wind generatorsthat are novel machines can improve machine torque density and efficiency, reducecost-effective materials and manufacturing costs. Becoming a hotspot in recent years andthere is a broad prospect for development.However, for high-power dual-rotor, permanent magnet synchronous wind generator，Because of the complexity of structure and process, the research is not very comprehensive,just stay at the stage of theory and small power prototype experiment. Electromagneticdesign of dual-rotor motor is studied particularly. Finally, the program of dual-rotor motoris designed by deducing equations and writing program of dual-rotor motor. The somepeculiar performances of dual-rotor permanent magnet synchronous wind generator areresearched in this paper. In order to reduce the amount of material and cost of thedual-rotor motor, different programs are designed. The main contents are as follows.Firstly, after the principles of operation, configurations and features are discussed. Thekey design equations of dual-rotor, permanent magnet synchronous wind generator thatcontain output voltage, no-load power generation electromotive force and short-circuitcurrent multiplier are deduced. Contrasting with the finite element method, There is smalldifference between them.Secondly, The inside and outside power allocation problem of the dual-rotor motor isstudied. The design processes of dual-rotor permanent magnet synchronous windgenerator are written by the software of MATLAB. Comparing the d-q axis armaturereaction reactance that is computed by the design processes to the d-q axis armaturereaction reactance that is computed by the finite element calculation, Two values are veryclose, The correctness of program is proved to some extent.Finally,A50pole180slot1.5MW,150r/min dual-rotor, radial-Flux, toroidally-wound,permanent-magnet synchronous wind generator scheme and a60pole72slot 1.5MW,150r/min dual-rotor, traditional dual sets of windings permanent-magnetsynchronous wind generator scheme are designed by debugging program, comparing thescheme and computing by finite element method. Some conclusions have been summed upby comparing these two motors. The cogging torque can be reduced availably by changingthe angles of permanent magnets, In order to reduce amount of NdFeB, the cost of thepermanent magnet can be reduced by replacing the NdFeB permanent magnet materials bythe built-in ferrite. The amount of material and cost of different schemes are studied.Compare to single rotor motor, dual-rotor permanent-magnet synchronous wind generatorscan reduce cost-effective materials and manufacturing costs and improve machine torquedensity.