Electrical motor is electrical rotation machine working on the principle of electromagnetic induction and converts electric power into mechanical. AC machines are any machines powered by alternating current (AC). AC motor with independent internal drives is the one whose internal drive winding is galvanically separated from armature. Rotation speed regulation of AC motor with independent internal drive is characteristic of rotation speed of AC motor with independent internal drive in idle drive dependant of the flow with constant armature voltage.

Rotational speed of DC motor with independent excitation can be regulated by the voltage of armature. Increase in voltage will increase the speed and decrease in voltage will reduce the speed.

By decreasing the excitation we get a larger rpm. RPM :

By increasing the extiation we get a smaller rpm. RPM :