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

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3 Author(s)
Younkin, George W. ; Giddings & Lewis, Fond du Lac, WI, USA ; McGlasson, W.D. ; Lorenz, R.D.

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

Published in:

Industry Applications, IEEE Transactions on  (Volume:27 ,  Issue: 2 )

Date of Publication:

Mar/Apr 1991

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