F - Mech Eng,Light,Heat,Weapons – 16 – H
Patent
F - Mech Eng,Light,Heat,Weapons
16
H
74/153, 341/91
F16H 59/04 (2006.01) G05B 5/01 (2006.01)
Patent
CA 1279209
ABSTRACT OF THE DISCLOSURE 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.
553194
Gowling Lafleur Henderson Llp
Reliance Electric Industrial Company
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