Design And Research Of Double Stator Permanent Magnet Synchronous Wind Generator

As a new energy source,wind energy has the advantages of cleanness,renewability and abundant reserves.Compared with common single stator permanent magnet synchronous motors,double stator permanent magnet synchronous motors have the advantages of high power,high efficiency and high power density.This paper designs a double stator permanent magnet synchronous wind turbine.In order to select the rotor structure of the designed Double-stator Permanent Magnet Synchronous generator,the influence of the internal and external stator armature reactions of the Double-stator Permanent Magnet Synchronous Wind Generator with double-layer permanent magnet series magnetic circuit structure on the air gap magnetic field was studied in depth.In other cases,it can be divided into four cases,and the mathematical analytic formula of air gap magnetic density is obtained.The influence of armature reaction on air gap magnetic field is further analyzed through its matrix form.Through the above analysis and research,the rotor structure of the dual-stator permanent magnet synchronous wind turbine designed in this paper is determined to adopt the double-layer permanent magnet series magnetic circuit structure.The electromagnetic design and calculation of the main parameters of the dual-stator permanent magnet synchronous wind turbine are completed.According to the characteristics of its operation,the design features and requirements are analyzed.The main dimensions of the motor,the selection of electromagnetic load,permanent magnet materials,stator slots and armature windings are analyzed in detail.The parameters of the motor are calculated,such as volume,quality and efficiency.Finally,some mainparameters of the motor are summarized in tabular form.Finite element analysis of the dual-stator permanent magnet synchronous motor is carried out,the finite element model of the motor is established,and the operation characteristics of the motor are analyzed.The conclusions are verified by analyzing and comparing the internal and external air gap flux density waveforms in four cases.The no-load back EMF of the motor is optimized by increasing the eccentricity and the voltage distortion rate under different eccentricities.Finally,the optimum eccentricity scheme is selected to make the no-load EMF waveform of the inner and outer stators closest to the sinusoidal wave.According to the equivalent magnetic circuit model of dual-stator permanent magnet synchronous motor(PMSM),the magnetic saturation is considered by using the magnetization characteristic curve of ferromagnetic material.The simulation model is established.The simulation results are compared with the finite element calculation results,which proves the validity of the simulation model.