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Speed-Sensorless Torque Monitoring on CNC Lathe using Internet  

홍익준 (서울시립대학교 대학원 기계정보공학과)
권원태 (서울시립대학교 기계정보공학과)
Publication Information
Journal of the Korean Society for Precision Engineering / v.21, no.5, 2004 , pp. 99-105 More about this Journal
Abstract
Internet provides the useful method to monitor the current states of the machine tool no matter where a personnel monitors it. In this paper, a monitoring method of the torque of the machine tool's spindle induction motor using interne is suggested. To estimate the torque accurately, spindle driving system of an CNC lathe is divide into two parts, induction motor part and mechanical part attached to the induction motor spindle. Magnetizing current is calculated from the measured 3 phase currents without speed sensor used to estimate the torque generated by an induction motor. In mechanical part of the system, some of the torque is used to overcome friction and remaining torque is used to overcome cutting force. An equation to estimate friction torque is drawn as a function of cutting torque and rotation speed. Graphical programming is used to implement the suggested algorithm. to monitor the torque of an induction motor in real time and to make the estimated torque monitored on client computers. Torque of the spindle induction motor is well monitored on the client computers in about 3% error range under various cutting conditions.
Keywords
CNC lathe; Internet; Condition monitoring; Spindle motor current; Cutting torque;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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