Research On Key Technology Of Direct Drive Electronic Jacquard Machine Based On Cylindrical Linear Motor

Aiming at the current electronic jacquard machines,which are caused by the mechanical transmission mechanism,the opening height is limited,the opening time cannot be adjusted flexibly,the transmission efficiency is low,and the parts are highly worn.It is proposed to use a linear motor-based direct-drive blade pulling mechanism to replace the traditional mechanical transmission mechanism,and the feasibility of the linear motor direct-drive blade pulling mechanism to replace the mechanical transmission mechanism is verified through mathematical modeling,simulation analysis and experimental verification.Firstly,according to the vector method and Newton-Euler method,the kinematics and dynamics analysis and modeling of the transmission mechanism of the traditional electronic jacquard machine are carried out.After entering the prototype parameters,the kinematics and dynamics performance of the pull-down blade of the existing electronic jacquard machine transmission mechanism is calculated.Based on this,the performance requirements for the new linear motor direct-drive pull-blade mechanism drive device are proposed.The model of the transmission mechanism of the traditional electronic jacquard machine is established through virtual prototype technology,and the correctness of the kinematics and dynamics mathematical model of the traditional electronic jacquard machine transmission mechanism is verified through simulation analysis.The calculation and simulation of the prototype show that the difference between the calculation results of the two is less than 0.5%,and the displacement,peak velocity and peak acceleration of the existing pull blade are 115 mm,916.8 mm/s and16750 mm/s2,respectively.Therefore,the new type adopted The performance of the linear motor direct-drive pull-blade mechanism drive device should meet the requirements of driving the pull-blade to achieve the above performance.Then,based on the applicability of various types of linear motors in different scenarios,combined with the application scenarios of this topic,a cylindrical synchronous linear motor with an outer winding hollow type transverse magnetization is selected as the driving device.In order to select appropriate motor parameters,the relationship between motor thrust performance and various parameters is studied.Using the ampere molecular current hypothesis,the superposition of the magnetic field and the Lorentz force equation,the analytical formula for the thrust calculation of this type of linear motor is derived.This type of linear motor model is established by electromagnetic finite element simulation software,and the simulation analysis result is compared with the numerical calculation result.The result shows that the numerical calculation result of the motor thrust is 8.6% lower than the simulation calculation result.Therefore,the established mathematical model of motor thrust calculation can play a certain theoretical guidance role for motor parameter design.Finally,the applicability of each control strategy is analyzed,and the rotor field-oriented vector control method is selected to control the linear motor in combination with the existing use scenarios.After establishing the control mathematical model of the cylindrical linear motor,the simulation control model of the motor is established through simulink and its reliability is analyzed.After selecting the experimental materials and building an experimental platform for experimental verification,the results show that: under the vector control mode of the rotor field orientation,the cylindrical synchronous linear motor with the hollow transverse magnetization of the outer winding can drive the blade to achieve the required Sports performance.