The question of calculating the actuator  on the strength of reason, not lit 
in the technical literature, despite its relevance in everyday work
designer. He always causes a lot of questions from novice designers.
   The method of calculating the actuator is simple. This method of jamming .  Let us clarify
its essence. Actuator - a chain of devices that mechanically linked to each
with one another. At one end of the chain motor is (or electro-
magnet), and at the other end - the actuator.
    essence of the method.  Actuator mentally jams in any
randomly selected location, and the chain of devices is calculated on the strength of
loads developed by an electric motor (solenoid).
   Data on the torque developed by motor is sometimes found in
reference books, but in their absence, the time can be determined by the following
formula:
           N = M * w
where N - motor power, W
    M - rated torque at the motor shaft, Nm
    w - angular velocity of the motor shaft, rad / s
                          
   For most engines (such as asynchronous AC) should
take into account the magnification of starting torque to nominal,
which is proportional to the magnification inrush current (shown in
references).
   The correctness of the calculation load can be verified by diameter shafts elektrodvi-
engines, gearboxes, clutches and other standard devices.
   We should not forget about safety factor and the possibility of torque control
drive (use of protective and control devices).