Analysis Of Loss Of High Speed Permanent Magnet Generator For Aviation

As is well known,motor is widely used in people’s life and industrial production,which is one of the most important electrical power equipment.Due to the development and improvement of electromagnetic properties,mechanical properties of electromagnetic materials,motor drive mode and the update optimization of algorithm and research of high speed bearing,the possibility of wide application of high speed motor is greatly improved.High speed permanent magnet motor has the advantages of fast dynamic response,high power density,small size,simple structure,strong high-speed performance and fault tolerance,and is able to adapt to harsh working conditions,so is has the advantage of technology in high speed application.High speed permanent magnet motor has great potential in military applications such as ship and aerospace.However,there are still a lot of technical problems in structure strength,temperature rise,power loss,protection of permanent magnet under the condition of high speed,which restrict the development and application of motor in related fields.At the same time,with the continuous improvement of the technology level of high-speed permanent magnet generator,the amount of high-speed motor in industrial production activities is increasing day by day,which greatly enhances the necessity of high-speed motor development.In this paper,a 45 kW,8000r/min,6-pole high speed permanent magnet synchronous generator(PMSG)is used as the research object.The various losses of PMSG are analyzed.Firstly,the copper loss,iron loss and mechanical loss of permanent magnet synchronous generator are analyzed.Secondly,the winding copper loss of the generator is calculated by the formula method.Model the generator through ansoft maxwell,simulate the core loss and the eddy loss of the permanent magnet by using the finite element analysis method,and analyze the change rule of the core loss and the eddy loss of the permanent magnet at different speeds,the cause of eddy loss and the influence of slot size on eddy loss of permanent magnet are also analyzed.By analyzing the distribution of electric density on permanent magnet and the calculation of eddy loss on permanent magnet and sheath,it is proved that permanent magnet sheath can effectively protect permanent magnet and reduce eddy loss of the generator.For the study of wind loss,the three-dimensional model of generator is established and be subdivided by gambit software,the wind loss of the generator was calculated through the fluent finite element method and the analytical method,the effects of air in two end cavities of generator,rotor speed,rotor surface roughness,rotor wind spurs on wind loss of generator are analyzed.Finally,the rationality of the proposed method is proved by comparing the data calculated by the two methods.