System and method for maintaining plural driven components at reference positions
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United States of America Patent
Stats
-
Feb 20, 1996
Grant Date -
N/A
app pub date -
Aug 8, 1994
filing date -
Aug 8, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The disclosure involves a machine, e.g., a portal crane, having two components such as bridge support legs or rail-riding trucks. Each component is driven by a separate motor and each is moving at a speed, perhaps a different speed. A method for maintaining the speeds of the two components substantially equal to one another includes the steps of providing a differential signal representing a difference between the speeds of the two components and generating an equalizing signal reducing the speed of the higher-speed component. Preferably, a second equalizing signal is also generated to increase the speed of the lower-speed component. A new drive system is also disclosed. The method and system are particularly useful for maintaining the 'squareness' of a double-leg portal crane.
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Cited Art Landscape
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