Spindle variable speed system design and analysis for CNC lathe experiment system

ZHENG Yan-qin, TANG Xue-zhe
(School of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310014, China)

Abstract: Mainly for the demand of designing high-accuracy, fast-response CNC lathe spindle variable speed system, a speed control proposal of fitting frequency motor and transducer together was raised via analyzing the basic principles and frequency of the variable frequency speed control. According to the CNC lathe experimental system operating conditions, the lathe cutting force and spindle motor power were calculated, evidence for choosing spindle adjustable frequency motor of experiment system was provided. In the light of the selected motor character, the basic principle of choosing transducer was proposed, then a transducer was selected which matched the frequency motor in the rated capacity and rated current. It is a high-performance and general-purpose voltage transducer using vector control. Finally, briefly the design ideas for CNC lathe experimental platform were described. The frequency motor and transducer are reasonable, and its adjustable performance and starting torque can meet the requirements of the experimental system.
Key words: variable frequency speed control; adjustable frequency motor; transducer; CNC lathe