Electromagnetic Analysis And Structure Optimization Of A Deflection Type Double Stator Switched Reluctance Generator

As an important way to obtain green energy,wind power generation has the advantages of wide distribution,clean environment protection,renewability and so on.At present,it has been valued by countries around the world and has a good development prospect.Switched reluctance generators have the advantages of simple structure,low cost,strong system reliability,and high power generation efficiency in the application of wind power.In order to obtain the maximum wind energy and improve the efficiency of power generation,this paper proposes a deflection type double stator switched reluctance generator suitable for wind power generation.The main research contents are summarized as follows:1)The operating principle and control method of the SRG are described.The characteristics of inductance,voltage and phase current are analyzed by establishing a linear mathematical model.Based on this,a deflection type double stator switched reluctance generator is proposed.The generator adopts the structure of double stator and spherical design to ensure the deflection of the rotor in a certain range.A simulation model is established in the finite element software to analyze the output characteristics of the generator.2)The core magnetic flux and air gap magnetic flux density of the generator are calculated using the analytic method of electromagnetic field theory.A mathematical model in the form of a magnetic flux waveform matrix is established to get the magnetic flux waveforms of the stator and rotor.The finite element method is used to simulate the model,and the magnetic flux density vector distribution of the stator and rotor,the regularity of the magnetic flux density at each point of the core,and the air gap magnetic flux density under different working conditions are obtained.The accuracy of the mathematics model and finite element model is verified by comparing the analytical results with the finite element method results,which shows that the generator has good magnetic field characteristics.3)In order to further improve the working efficiency of this generator,this paper introduces the response surface method into the structure optimization process,and introduces its principle.The stator core loss of the generator is selected as the optimization target,and the parameter variables are selected according to the Taguchi algorithm.Thecentral composite design method is used to construct the test sample points,and the response surface numerical models of the inner stator core loss and the outer stator core loss are established respectively.By analyzing the variance and the interaction of structural parameters,the better structural parameters of the generator are determined.4)The prototype of the generator is fabricated,and a prototype experimental platform is built.The generator is dragged by a servo motor to rotate,and the output voltage under different working conditions is measured in the separate excitation mode.The accuracy of the mathematical model calculation and finite element model simulation of the generator is verified.