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servo motors change their rpm as instructed

servo motors recieve instructions from a controller to do some action

servo motors generally have feedback so the controller can see where they need to go

servo motors can be electric air or hydrolic powered

an example:

cars have a cruse control

you set a desired speed of travel

the vacuum powered servo motor controls the throttle of the gas engine

the transmission controls the ratio of gearing so the engine is not overloaded

at some point when conditions are satisified you will get the correct speed ...

if you go over the desired speed the vacuum powered servo motor backs off

which eventually controls the differential driving rpm of the rear wheels

here again the servo motor can be considered to be the valve on the vacuum bladder or the entire drive train

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11y ago

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