| 摘要 |
A motor control system for controlling a plurality of drive motors in a web tensioning system includes individual motor control circuits for each motor in the system. The web tensioning system includes a main exit drive motor and a plurality of helper drive motors. A single tensiometer is positioned near the exit motor to sense web tension at this point. Each helper motor control circuit is connected to this exit tensiometer to receive the exit tension as a tension feedback. Based solely upon this feedback value and a speed feedback from the associated motor, each motor control circuit is programmed to independently provide tension based control for its associated helper motor to compensate for its proportionate share of system induced drag on the web, resulting in uniform tension on the web throughout its path. Each motor control circuit can be switched between the tension based control and a speed based control format.
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