The High Power-density Drive Motor Design Of Automatic Mechanism Of The External-Powered Gatling

With the advantages of high firing frequency,high muzzle velocity,fast response and short firing preparation time,External-Power Gatling Weapons are widely using in terminal defense systems.However,for a long time,the motor system in the External-Power Gatling Weapons has been poorly adapted to the load characteristics,resulting in large fluctuations in its outputspeed and output-torque,which affects the firing dispersion and accuracy.In addition,the power density and integration of the motor system is low,which cannot meet the demand of miniaturization and lightweight development of equipments.In order to solve the above problems,this paper,based on the special properties of rotary tube weapons,breaks through the traditional motor design method and designed a drive motor design of automatic mechanism of the External-Powered Gatling Weapons with high power density and high torque density,while ensuring the starting performance and response speed of the motor.The specific work carried out is as follows:1)A flat-wire motor with a rated power of 20 k W,rated speed of 6500 rpm and rated torque of 30 Nm are designed for the demand of automatic mechanism of an External-Power Gatling Weapons.Using the Maxwell analysis method,the electromagnetic performance and output performance of the flat-wire was analyzed in detail under no-load and load.(2)In order to improve the power density of the flat-wire motor and the output performance of the whole machine,the electromagnetic load is increased as well as the multiobjective optimization method is used.Firstly,in this paper,reduce the overall weight of the flat-wire motor and directly improve the power density of the motor by increasing the electromagnetic load of the flat-wire motor.Then,the optimal structural parameters are calculated using NSGA-II multi-objective optimization algorithm with cogging torque,no-load back EMF,rated torque,and torque ripple as optimization targets to improve the motor output performance.The final power-density achieved by the flat-wire motor is 7.3k W/kg and the torque-density is 13.67Nm/kg.(3)In order to analyze the effect of internal temperature on motor output performance of flat-wire motors under transient operating regime,the equivalent thermal conductivity and equivalent heat dissipation coefficient of the internal material of the flat-wire motor are calculated using the thermal principle,and then a multi-physical field coupling model is established using the electric-magnetic-thermal-solid multi-physical field coupling analysis method to analyze the internal temperature rise of the flat-wire motor under different operating conditions and to calibrate the motor rotor strength.(4)In order to study the starting performance and response speed of the flat-wire motor,a Maxwell-Simplorer-Simulink simulation platform based on the MTPA control strategy is built in the Simplorer environment to realize the organic combination of the control strategy and motor design.And simulation analysis of flat-wire motors under no-load,rated load is performed,the simulation results verify the rationality of the high power density flat-wire motor design.