Apparatus for immobilizing a working shaft at a predetermined angular position
OwnerHeinz Daab, Bernd Scheiderinventors
Life of this patent
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Abstract
A positioning drive with an electronic regulator for controlling the r.p.m. of a working shaft has a regeneratively coupled amplifier with variable negative feedback adjustable from a normally high value to a minimum value for the final braking action, whereby the shaft is abruptly brought to rest at a predetermined angular position.
Claims13
Apparatus for immobilizing a shaft at a predetermined angular position, comprising an electric clutch motor whereof the clutch element transmissively coupled to the working shaft may be connected to a continuously driven main driving spindle of the clutch motor and/or to a braking member by the action of regulator operatively controlled by the difference between the actual speed of revolution and a predetermined nominal speed of revolution, to drive the working shaft substantially at a predetermined working speed of revolution, wherein the improvement comprises:
- said regulator having a regeneratively coupled control amplifier having means connected between the input and output thereof for generating a variable degree of negative feedback, and means for adjusting said feedback to a minimum value for the final braking action.
An electronic control system for a positioning drive for a rotating shaft, comprising means for producing a control signal indicative of r.p.m. of the shaft, a control amplifier operatively receiving said control signal and having a variable feedback circuit connected between the input and output thereof, a shaft clutch winding, an electromagnetic brake winding, a braking amplifier operatively connected between said brake winding and said control amplifier, a clutch amplifier substantially symmetrical to said braking amplifier operatively connected between said clutch winding and said control amplifier, signal inverting means interconnected between said control and clutch amplifiers, and means connected to said feedback circuit for automatically switching the level of feedback to a minimum value for final energization of said brake winding.
Dependencies are inferred from the claim text.