定子径向变齿槽宽比削弱对转双转子同步发电机感应电压谐波研究OA

[Objective]To address the issue of high harmonic content in the air-gap magnetic field and deteriorated induced voltage waveform caused by the traditional constant slot-tooth width ratio structure,this study designs an axial-flux counter-rotating dual-rotor synchronous generator(CR-DRSG)with a stator-radially variable slot-tooth width ratio(S-RVSWR).[Methods]A three-phase 6-slot fractional-slot concentrated winding modular stator was proposed,featuring a variable slot-tooth width ratio structure where the tooth width remained constant and the slot width increased linearly with the stator's circumferential radius.Distributed-winding rotors with 24 slots were placed on both sides of the stator,with dominant pole pairs of 2 and 4,respectively.The magnetic fields generated by DC excitation of the dual rotors were coupled with the stator's dominant pole pair fields.The integral cancellation mechanism of non-working harmonic fluxes was derived using the magnetomotive force-permeance model and radial integration theory.The electromagnetic performance of the traditional and new structures was compared and analyzed through three-dimensional finite element simulations and a prototype experiment platform.[Results]The simulation and experimental results demonstrated that the S-RVSWR structure significantly improved the induced voltage waveform,making it closer to a sine wave.Compared to the traditional constant slot-tooth width ratio structure,the total harmonic distortion of the no-load phase voltage(5 Hz)was reduced from 24.31%to 5.20%,with the amplitudes of the 5th,7th,and 11th harmonics notably decreased.[Conclusion]The structure effectively suppresses low-frequency harmonics in the induced voltage by leveraging the integral cancellation effect generated by the stator's radial geometric non-uniformity.And the effetiveness of the S-RVSWR design has been verified.