Research On Armature Flight Speed Detection Tchnology For Six-pole Electromagnetic Emission System

The electromagnetic emission system has attracted much attention both at home and abroad because of its great application potential.Among them,the induction coil transmission system is its important research content.Induction electromagnetic transmission system,the drive coil structure,armature structure,control system and other parameters for electromagnetic emission performance has a greater impact.Among them,the control system is particularly important for the design of the trigger discharge location,premature or late trigger will reduce the efficiency of the launch system,accurate measurement of the armature movement position and accurate control of capacitor discharge to play high-speed electromagnetic emission performance is of great significance.To accurately pinpoint the drive coil,it is necessary to increase the accuracy of the armature flight state(speed and position)measurement.Therefore,this paper through the photoelectric detection speed and combined with the external program to achieve accurate control of the pulse capacitor discharge,to ensure that the armature movement to the best position,the drive coil can be triggered in time.Based on the analysis of electromagnetic emission and the construction of the experimental platform,build a set of complete export based on the FPGA dual speed measurement system.Firstly,research status electromagnetic launch systems armature velocity and position measurements,comparison of existing measurement methods,a suitable method is proposed for measuring the speed of the armature outlet multistage multipole moments electromagnetic transmission system.Secondly,Based on the theoretical analysis of the laser truncation method,combined with the working principle of the rotary encoder,two kinds of reflection sensors are used to reflect the different luminous fluxes of different materials such as aluminum ring and reflective film.The design of the dual sensor and single sensor for the armature straight line speed and rotation speed To measure,and the use of low-speed,high-speed two different measurement programs,build a set of FPGA-based armature outlet two-speed measurement systemThirdly,the finite element software Ansoft Maxwell is used to establish the three-dimensional model of two-stage hybrid six-pole moment transmitting system.Imported finite element software Infolytica Magnet for comparison and joint simulation analysis.Adjusting the initial angle and the trigger position of the slotted armature,obtaining the lower straight line speed and the rotational speed,determining the optimal initial rotation angle of the armature and the optimal trigger position of the second stage driving coil.Through the linear speed,the use of FPGA timing control subordinate capacitor discharge,optimize the performance of the launch system.The intensity of the electromagnetic field in the trailing region of the two-stage drive coil is simulated and the influence of the launch system on the velocity measurement system is discussed.Finally,on the basis of the actual simulation,a small two-stage hybrid six-pole electromagnetic emission experiment platform is built;respectively,using two sensors and the two-speed single sensor measuring the outlet,Through the analysis of the simulation results and experimental results,verify the feasibility of single-sensor simultaneous measurement of two-speed.