Design Of Stepping Motor For Magnetic Bearing And Driver

With the continuous development of productivity,every country has turned their attention to the exploration of the universe and the development of space resources.Meanwhile,the research on the detection technology of the outer space of the earth is becoming more and more popular.These studies,which have important scientific research value,provide a tremendous impetus to the development of astronomy,cosmology,material science,life science and ideological science.The space target detection system plays a fundamental and critical role.As is known,spacecrafts flying in space have to withstand unique and extreme environments,such as extreme temperatures,overweight,weightlessness,microgravity and cosmic ray radiation.A gear transmission mechanism,which exists in the current space detecting device,tends to become cold welding where the gears mesh with each other under special circumstances.Once the occurring problem is not repaired in time,the satellite of scientific research and detection will suffer a huge loss.Due to its unique advantages,it is especially suitable for magnetic suspension bearing technology to be used in special environments,such as high speed,vacuum and ultra-clean.In order to achieve accurate positioning and tracking of the target,by using a stepping motor that strictly responds to the pulse signal,we design a high-performance and high-resolution drive,supplemented by a magnetic suspension bearing.Finally,we design a magnetic levitation tracking system.The paper aims to analyze and explain the overall structure of the magnetic levitation tracking system which is designed according to the needs.In this paper,the various parts of the magnetic levitation tracking system are designed,including the motor part and the magnetic suspension bearing parts,between which there is no magnetic field coupling.Therefore,it can be designed independently.Meanwhile,the structure and composition of the magnetic suspension bearing portion were determined.The magnetic levitation tracking system consists of two magnetic suspension bearing stepping motors.Based on the hybrid stepping motor,the overall structure of the motor is determined and the parameters of each part of the motor are calculated in detail.The parameter design includes main dimension design,punch design and winding design.The preliminary performance calculation is carried out by using the design parameters,and the results show that the design is feasible.The paper also studies the principle of subdivision drive in the stepping motor drive mode.The hybrid stepping motor is mathematically modeled.Besides,the hybrid stepping motor model and the subdivision driver model are built in the simulink simulation platform.Hybrid stepping motor model consists of electrical and mechanical parts.The subdivision driver model includes a current subdivision module,a current hysteresis control module,and an H-bridge power drive module and so on.The paper completed the simulation of the two-phase hybrid stepping motor in the subdivision driving mode and analyzed its results.According to the designed parameters,the required two-phase hybrid stepping motor prototype is machined.Meanwhile,the experimental test and analysis of the hybrid stepping motor driver SM808D,controller DKC-S100 and power supply are carried out.During the experiment,the rotation angle of the motor is too small to be distinguished and measured.In order to facilitate the observation of the experimental results,a simple device for angle measurement is designed.In order to simulate the working state of weightlessness environment,and because the load torque is very small,no-load experiment is adopted.In a large number of experimental data,four groups of representative data with subdivisions of 32,64,128 and 256 were selected for comparative analysis.The analysis results show that the existing equipment does not perform well in the high subdivision state.The reasons are analyzed and the research prospects are put forward.These experimental results provide valuable reference for subsequent research.