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Using electrical motors to drive gearing may be an excellent choice when cost is a consideration. Electrical wires can be laid more easily and electrical systems are relatively clean.
Use of hydraulics may be excellent where power and simplicity is important.
Most of actuators operate in a linear (straight line) manner. Hydraulic rams, and pneumatic diaphragms work in this manner. There are also some that are constructed to operate in a rotary manner.
Electrical motors normally operate in a rotary manner. However if a linear motion is needed, this can be obtained by means of spur gears, rack and pinion arrangements, crank and other means.
Actuators can provide power to move final control elements, but do they know when to stop?
A good control system will provide sensing and feedback loop to tell actuator when to stop its actions.
Well folks, be in control!
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