焊接系统中直流电机转速控制的研究  

Study on rotating speed control of DC motor in welding system

作　　者：李林[1] 

机构地区：[1]成都纺织高等专科学校电子信息与电气工程系,四川成都611731

出　　处：《电焊机》2011年第8期97-100,共4页Electric Welding Machine

摘　　要：在CO2焊接和埋弧焊接系统中,精确控制行走电机和送丝电机的速度是提高焊接质量的重要保证,传统直流电机转速控制方法是通过转速表测量电机的转速后反馈控制,该控制方法存在精度差、不易调试等缺点。采用锁相环闭环控制直流电机的转速,其控制方法是:由于行走电机和送丝电机的转速比较慢,因此,编码器不通过减速机构直接安装在直流电机的转轴上,从而测得电机的转速,与设定速度作PI控制产生PWM波形控制H型双极可逆驱动电路开关管的导通时间,从而精确控制直流电机的转速。试验表明,该方法控制精确高,能稳定、可靠、实时地控制电机转速。In CO2 welding and submerged arc welding system,precise control of the speed of the moving motor and wire feeding motor is an important guarantee to improve the welding quality of dc motor speed control,the traditional method is detecting motor speed with tachometer to feedback control system,this control method is poor,not easy to adjust the control accuracy.This article adopts the phase locked loop closed-loop to control dc motor speed,and its control method is：because of the moving motor and wire feeding motor speed is slower,therefore,not through the slow institutions encoder directly installed in dc motor shaft,which measured the speed of the motor,and setting speed make PI control to produce the PWM waveform to control H bipolar reversible driving circuit switch＇s runs.Thus accurately control dc motor speed,the experimental result indicates that the method can accurately control high,stable,real-time controlling motor speed.

关 键 词：直流电机 编码器 锁相技术 H型DC/DC变换器 

分 类 号：TG409[金属学及工艺—焊接]