System of driving by electric motor machines which work in a periodic manner at torque variable as a function of the angle of rotation
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United States of America Patent
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Apr 26, 1994
Grant Date -
N/A
app pub date -
Mar 6, 1992
filing date -
Mar 13, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Machines having torques variable as a function of the angle of rotation such as piston driving mechanisms like compressors, cam driving mechanisms, printing machines and looms, are driven by an electric motor in such a way that a trend in angular velocity which is dependent upon the angle of rotation, in particular also a constant angular velocity of the main driving shaft (2) of the driven machine, may be predetermined. To do this the angle of rotation (3) as well as the torque (4) are picked up off the main shaft (2) and fed to an adaptive control system (S) which, starting from the desired values (s0) of the angular velocity as a function of the angle of rotation, applies a corresponding correcting variable (Y) to the electric motor (1) and iteratively adapts it periodically in order to bring the trend in angular velocity of the main shaft (2) into agreement with the desired value (s0).
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