I have a rotating shaft that I need to apply a rotational force to which varies depending upon the shaft position. However, the shaft will be rotated back and forth, or all the way around, randomly, at any speed, by forces much larger than the motor applies. In other words, the motor is not expected to successfully control the position or movement of the shaft, just apply a given rotational force in either direction, depending on the shaft position. I have successfully accomplished this with air cylinders, but that solution is overly complex for production. Can anyone think of a motor type that can handle this?
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