Design Of High-precision Magnetic Levitation Tracking System

In the 21st century,the research on space in various countries has become more fierce and the space flight detection activities in various countries have become more frequent.The existing space target tracking system still uses traditional gear transmission,and cold welding between gears is prone to occur in space.At the same time,the existing tracking and targeting system cannot accurately track the target,and the reliability of the traditional gear transmission is not high.If the operation failure occurs in the remote space and is difficult to repair,it will cause a very large loss.Solving the problems of space cold welding and inability to accurately track targets in the space target detection system has become a prerequisite for determining whether the space target tracking system can work normally for a long time.Magnetic levitation technology can solve the problem of cold welding in space.The magnetic suspension bearing is used in the space target tracking system to replace the mechanical gear transmission mechanism of the existing system,avoiding mechanical contact and solving the problem of cold welding in space.At the same time,it has the advantages of fast response speed,low energy consumption,low noise,long life,no lubrication,no oil pollution,especially suitable for high-speed,vacuum,ultra-clean and other special environments such as space target tracking system.In order to achieve precise positioning and tracking of targets,electromechanical actuators can use stepper motors that convert electrical pulse signals into corresponding angular or linear displacements.Design a high-performance and high-resolution subdivision driver to achieve high-precision subdivision of the stepping motor and achieve precise positioning and tracking of targets.The high-precision magnetic levitation tracking system composed of magnetic levitation bearings,stepping motors,drives,etc.can solve the problem of cold welding in space and achieve precise positioning and tracking of targets at the same time.This article designs a tracking system based on magnetic bearings and stepper motors.Using magnetic bearings,it solves the problems of cold welding and low reliability between gears that mesh with each other in the low temperature environment of space.Using a controllable current source to achieve a high-precision and high-resolution stepper motor subdivision drive method,to achieve low speed and short-distance motion stop and start.A three-degree-of-freedom hybrid magnetic levitation bearing simulation model was established and analyzed.In traditional magnetic levitation systems,two radial magnetic bearings and one axial magnetic bearing are generally used to achieve five degrees of freedom.But three magnetic bearings will increase the length of the rotor shaft and increase the volume of the magnetic levitation system.The hybrid magnetic levitation bearing with three degrees of freedom is used to replace a radial magnetic bearing and an axial magnetic bearing in a magnetic levitation system,thereby reducing the size of the magnetic bearing system.Moreover,the hybrid magnetic bearing has the advantages of reducing the power consumption of the power amplifier and reducing the number of turns of the electromagnet,and is particularly suitable for use in a miniaturized,low power consumption system.A magnetic levitation tracking system device was designed,and a two-phase hybrid stepping motor drive system simulation model was built in matlab/simulink with a modular idea.Finally,experimental tests are performed,and the experimental results are analyzed and summarized.