Design And Loss Analysis Of High Speed Permanent Magnet Generator With Permanent Magnet Layered Bundling Structure

The high speed of the permanent magnet machine itself,larger power density,much smaller than medium and low speed motors of the same power,and can be directly connected to the load,eliminating the need for a shifting device.Due to these advantages of the high speed permanent magnet machine,it have good application prospects in the fields of aerospace,defense,flywheel energy storage,industrial and agricultural production and daily life.Simultaneously,these characteristics of the high speed permanent magnet machine make it have higher centrifugal force than the conventional motor,high eddy current loss of the rotor,low utilization of the core,and large fluctuation of the rectified voltage and current.This paper proposes a permanent magnet structure in which the rotor is layered and bundled with a mixture of magnetic powder,resin and carbon fiber.However,because the simulation model can not be built,this paper designs a 350kW,30000r/min high-speed permanent magnet generator with perm anent magnet and sheath layered structure for approximate analysis.And analyze the generator in three aspects:electromagnetic design,rotor strength and motor loss.The main research contents are as follows:In the first step,the structure of the generator is determined based on the characteristics of the high-speed permanent magnet generator,which relates to the determination of the rotor size and the determination of the pole of the generator.The stator core and winding are determined for 350kn.30000r/min.The new high-speed permanent magnet generator was verified by finite element analysis.The size and material of each part of the generator were determined,and verification of the rationality of generator design.In the second step,the rotor strength is analyzed from the mathematical model,and the model of rotor strength analysis of the generator is drawn by using ANSYS simulation software.The stress of the generator rotor was studied,and the relationship between different temperatures,different speedss different sheath thicknesses and different interferences and generator rotor stress were studied.Electromagnetic analysis verified the rationality of the layered lashing structure.Then,a mathematical formula for the stator iron loss involving the influence of each harmonic and the rotational magnetization of the generator on the motor is constructed.This mathematical formula is used to analyze the stator iron loss of the generator,and the software is executed for simulation analysis.The wind friction and rotor loss on the rotor surface of the generator are calculated by a formula method.The rotor eddy current loss simulation was verified by Ansoft finite element software.Finally,based on the eddy current loss theory and simulation analysis of generator rotor,the permanent magnet structure,slot width,air gap length and stator slideway are analyzed,protective sleeve conductivity and thickness of several factors on the new high-speed permanent magnet generator rotor.The influence of eddy current loss further verifies the rationality of the permanent magnet structure of the mixed material and optimizes the structure and parameters of the generator.