Why High Inertia Dc Servos are Supplanting Hydraulic Drives on Machine Tool Slides
The latest thing in machine tool control is, of all things, a high inertia d.c. motor. Once considered an anathema to servo engineers, high inertia is proving to be very desirable when associated with the drives applied to machine tool slides. High inertia motors provide the necessary torque without gears. They assure a servo stability that makes high velocity loop gains easy to obtain, and they have the inherent ruggedness necessary for reliable performance. Remarkably it took twenty years to find this out. A short review of the history of the development of machine tool slide drives will make this quite clear.
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