Finite Element Analysis And Research On Hybrid Excitation Brushless Claw Pole Generator

Because of the increasing demands on vehicle safety and comfort,the electronic control devices and electrical equipment in the vehicle are increased,the power consumption is increased,and the generator in this overload state work,reduce service life;in addition,more and more vehicles on the road,resulting in traffic congestion,the vehicle will frequently start,and a long time at low speed,so that the battery discharge is large,can not output the rated voltage and power.To solve these problems,we need to use high-power,large generators,but not only increase manufacturing costs,and limited space inside the vehicle,so that the engine in the installation,maintenance is not convenient.Therefore,without reducing the output power of the case,to reduce its size;or in the original volume,the development of higher power generators will become an important area of automotive research.This paper studies the hybrid excitation claw pole generator with a special structure,the generator air gap magnetic field is provided by the parallel magnetic field and the permanent magnetic field,the permanent magnet easily reversible demagnetization,and adopts brushless structure,low failure rate.Compared with the traditional electric excitation claw pole generator,power density high speed,good performance,has the advantages of small excitation loss;compared with the permanent magnet claw pole generator has the advantages of air gap magnetic field can be adjusted.Based on the JMAG three-dimensional electromagnetic field finite element software and through the performance test,focus on the analysis and calculation of the parallel type hybrid excitation brushless claw pole generator structure characteristics,the characteristics of magnetic field regulation under different excitation current,no-load characteristic,load characteristic,stator iron eddy current loss and the no-load magnetic flux leakage coefficient under different structural parameters.Compared with the same structure parameters of the electric excitation brushless claw pole generator,the hybrid excitation brushless claw pole generator can produce higher air gap magnetism flux density and induced electromotive force;when the average flux density of air gap is the same,the excitation current is much smaller than that of the electric excitation brushless claw pole generator,which effectively reduces the excitation loss of the generator;change the exciting current,both can enhance the air gap magnetic field,but also can weaken the air gap magnetic field,the magnetic field in air gap can be controlled in a large range,which solves the shortcoming that the permanent magnetic claw pole generator can not adjust the magnetic field.Finally,the design of orthogonal test,based on the support vector machine(SVM)non parametric modeling and the particle swarm optimization algorithm(PSO)for hybrid excitation brushless claw pole generator for structural optimization.