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Considerations for low-inertia AC drives in machine tool axis servo applications

1991; Institute of Electrical and Electronics Engineers; Volume: 27; Issue: 2 Linguagem: Inglês

10.1109/28.73609

1939-9367

George W. Younkin, W.D. McGlasson, R. D. Lorenz,

Control Systems in Engineering

The important differences encountered in applying AC permanent magnet servomotors that might have one-tenth of the shaft inertias of their torque-equivalent predecessors to machine tool axis servo applications are examined. Experimental results demonstrating these differences and corroborating the conclusions drawn are provided. Experimental testing was accomplished on a motor test stand and in a machine tool axis servo application. The test stand had two AC servomotors coupled in a motor/dynamometer configuration. Analytical and experimental results demonstrate that in addition to affecting the acceleration or command-following capabilities of the servomotor, reduction of shaft inertia affects the controller tuning robustness, bandwidths, and dynamic stiffness characteristics and also has implications for the drive/controller sampling rate. The process of selecting an appropriate servomotor for such axis servo applications is reviewed, and the factors that are affected by motor/magnet technology are summarized. >