The bowl feeder as well as its linear version based on the hysteresis of the involved spring-magnet device-system. Changing the frequency of the vibrations of the magnetic device you can make that the parts in the feeder will vibrate in standstill or will move backwards. A big difference in the load will do the same. Instead of electromagnets they use piezoelectric devices too, or for really big feeders simply an electro motor with a unbalanced weight on its axis.
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