Electromagnetic Design And Optimization Of Permanent Magnet Synchronous Generator For Range Extender

Extended-range electric vehicles are a good solution to solve current pure electric vehicles with short driving range,long charging time,and limited charging equipment.The range extender,as a battery charging device,plays an important role in increasing the driving range.Its core components and control system are the most difficult points in the development of range extender technology.The design of generators for range extenders requires high efficiency,stable output voltage,and compact size.Permanent magnet synchronous motors are currently widely used motor types and are also the mainstream of future motors.Therefore,the main research work of this paper takes the permanent magnet synchronous generator for range extender as the object for design and optimization.Firstly,by reading the literature,it summarizes the current research status of range extender generators and related technologies at home and abroad.At the same time,it explains the importance of reducing the voltage regulation rate for the stability of the output voltage of the permanent magnet synchronous generator;Secondly,for a certain micro low-speed electric vehicle,starting from the actual power demand of the vehicle,the power level of the two major components of the range extender,the engine and the generator,was determined,and the rated parameters of the generator to be designed were determined to improve the pertinence of range extender;Then,combined with the basic theoretical knowledge of motor design,the electromagnetic analysis software ANSYS Maxwell was used to design the electromagnetic parameters of an outer rotor permanent magnet synchronous generator for range extender,and the corresponding two-dimensional finite element model was established.Analyzed the transient field of the rated load and obtained its magnetic density cloud diagram,voltage curve,loss curve and efficiency MAP diagram,etc.,and developed a prototype for no-load test to verify the rationality of the electromagnetic parameters of the designed generator And the accuracy of the simulation model;Finally,based on the designed outer rotor permanent magnet synchronous generator,Maxwell was used to quantitatively analyze the influence of different electromagnetic parameters on the voltage adjustment rate,and the multi-parameter optimization of the motor was carried out based on the Taguchi-PSO method.First,the sample data is established through orthogonal experiments,and then the sample data is fitted by the Fourier model to obtain an optimized approximate model.Finally,a set of optimized parameters is obtained by using particle swarm algorithm and verified by finite element simulation.The results show that sue the Taguchi-PSO method,the voltage regulation rate is reduced from 9.67% to 4.45%,and the amount of permanent magnets is reduced by5.80%,which has almost no effect on the motor efficiency.