Variable speed drive

Details Variable speed drive Variable speed drive

1986-12-02

1988-09-13

Braun, Leslle A.

Machine element or mechanism

Rotary member or shaft indexing, e.g., tool or work turret

Preselected indexed position

474 12, 474 18, 318624, F16H 1106, G05B 501

Patent

active

047700653

ABSTRACT:
A mechanically adjustable variable speed drive includes an electric actuation apparatus which can be controlled by an analog embodiment or a digital circuitry embodiment. A speed change actuator is automatically and mechanically adjustable, such as with a controlled servomotor. A tachometer determines the actual rotational speed of a drive shaft, which is compared in a digital controller with a manually set desired rotational output speed. The digital controller (or an analog circuit in the case of the analog embodiment) controls the servomotor to adjust the mechanically adjustable variable speed drive. An automatic deadband means inhibits driving of the servomotor whenever the tachometer signal and the desired speed setting signal is within a predetermined deadband, which deadband is adaptively changed responsive to various conditions. The rotational information, both desired and actual, may be displayed, with display of the desired speed prior to actual operation of the drive being used to accurately preset the desired speed.

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Brochure entitled "SmartTrol Drive System Regulator" authored by T. B. Wood's Sons Company, Chambersburg, PA.
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44Technical Guide for "DISCTRAC" Mechanical Adjustable Speed Drive, Reliance Electric Co., 1985.

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