一种电子束焊机磁聚焦装置的控制电源

A Control Power Supply for Magnetic Focusing Device of Electron Beam Welder

电子束焊机磁聚焦装置中铁磁材料的励磁电流与磁感应强度不是线性关系,导致电子束斑的焦距重复性精度差。励磁绕组中交替通入正反向电流进行退磁来消除磁滞回线的影响,实现了励磁绕组的励磁电流与磁感应强度呈单值对应关系,同时励磁绕组电源采用精密电流检测元件并配合恒流控制方法保证电流稳定,确保磁聚焦装置磁场强度工作误差小于0.1%.

The excitation current of ferromagnetic material in magnetic focusing device of electron beam welding machine is not linear with magnetic induction intensity,which leads to poor repeatability accuracy of electron beam spot. In the excitation winding,alternating forward and reverse currents are applied to demagnetization to eliminate the influence of the hysteresis loop,and the excitation current of the excitation winding has a single value corresponding to the magnetic induction intensity,at the same time,the excitation winding power supply adopts precise current detecting element,and the constant current control method is used to ensure the current stability,and the working error of the magnetic field intensity of the magnetic focusing device is less than 0.1%.