Structure Design And Optimization Of Electromagnetic Array Needle Drive

Aiming at the problem that it is difficult to improve the efficiency of the existing knitting machine,this paper breaks the limitation of the traditional knitting machine's needle driving principle,and proposes a new electromagnetic array type hybrid magnetic levitation needle driving method.By measuring the rising height of the needle,it can control and change the magnitude and direction of the current loaded by the electromagnetic coil and the lateral displacement of the machine head in real time,so as to improve the efficiency So that the needle can act according to the set knitting process.This paper studies the spatial magnetic field distribution of the electromagnetic coil and permanent magnet rubidium iron boron,analyzes the relationship between the motion height of the permanent magnet needle and the electromagnetic force in the hybrid magnetic levitation drive system of the permanent magnet needle and the electromagnetic coil,obtains the important technical indexes of the permanent magnet needle drive process,and designs an electromagnetic array needle drive structure for reference.On the basis of this structure,based on the distribution law of the axial magnetic induction intensity of the permanent magnet needle and the electromagnetic coil,the mathematical model of the magnetic field of the permanent magnet needle,the electromagnetic field mathematical model of the electromagnetic coil,the electromagnetic permanent magnetic suspension driving mathematical model and the magnetic field model of the electromagnetic array needle are established,and the kinematics equation of the permanent magnet needle is obtained,which provides important reference for the study of the motion law of the permanent magnet needle We need the theoretical basis of the theory.Based on the driving model of Maglev needle,based on the single type of permanent magnet needle driving structure,the control of the current of the magnetic coil driving the maglev needle is designed.A closed-loop controller of the magnetic levitation needle current based on STM32 and the full bridge driving circuit is designed.The simulation model of control system and PID is established in Simulink software.Under the condition of current excitation,the time sequence diagram of the current response of the electromagnetic coil is obtained.The simulation results show that the controller can control the current of the needle suspension quickly and stably.Based on the single electromagnetic permanent magnet needle driving structure studied in the early stage,a new type of electromagnetic array type needle driving structure is designed.The structure creates driving force through array electromagnetic coil,increases the suspension driving force of the needle,improves the speed of the needle movement and improves the knitting efficiency of knitting machinery.Secondly,the optimal knitting axial driving force is obtained by optimizing the driving structure of electromagnetic array,so as to achieve the optimal structure design.On the basis of the optimal structure,the mathematical model derivation and finite element simulation are carried out by the coupling magnetic field of the train driving structure,the structure of the knitting machine based on the array hybrid electromagnetic suspension drive is expanded and designed.A simple experimental platform is built to test the driving performance of the electromagnetic array knitting machine,which verifies the rationality and feasibility of the scheme.