绝缘工程陶瓷电火花铣削直流伺服电机控制系统研究

DC Servo Motor Control System for Electric Discharge Milling of Insulating Engineering Ceramics

绝缘工程陶瓷电火花铣削技术是作者开发出的一种新型加工技术.直流伺服电机控制系统是该加工技术的一个重要组成部分,它对绝缘工程陶瓷电火花铣削的效率、精度和表面质量等有很大的影响.在对绝缘工程陶瓷电火花铣削加工技术的工作原理和特点进行分析研究的基础上,研制出了直流伺服电机控制系统,介绍了该控制系统的功率放大、PWM脉宽调制电路和电磁兼容电路的设计原理.采用该控制系统对绝缘A l2O3陶瓷和SiC陶瓷进行了电火花铣削加工工艺试验,给出了脉冲宽度对加工生产率和表面粗糙度的影响关系.试验结果表明:该直流伺服电机控制系统具有结构简单、可靠、跟踪精度高、系统响应速度块、调速范围宽、低速稳定性好等优点,可满足绝缘工程陶瓷电火花铣削加工的要求.

A new technique of electric discharge （ED） milling insulating engineering ceramics has been recently developed by the authors. DC servo motor control system is an important part of the process. It is a primary factor that affects the material removal rate, machining precision and surface quality for ED milling of insulating engineering ceramics. Based on the analysis and research of the working principle and characteristics for electric discharge milling insulating engineering ceramics, a DC servo motor control system is developed. The design principles of the power amplifying circuit, pulse width modulation （PWM） circuit and electromagnetic compatibility（EMC） for the servo control system are introduced. The technologic experiments for ED milling of insulating Al2O3 and SiC ceramics have been done. The effects of pulse ontime on machining productivity and surface roughness have been investigated. The experimental results show that the DC servomotor control system has simple structure, high reliability, high precision in track, quickly responds to speed, widely speed regulation, and good stability in low speed. The servo control system can meet the demand for electrical discharge milling of insulating engineering ceramics.