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An electrical actuator that converts electrical energy into rotational motion or sustained linear motion (linear motor). If the specific type of motor is known, it is helpful to use or add a more specific tag, such as dc-motor, brushless-dc motor or induction-motor.
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Speed control of a DC motor using variac
If it is a DC motor then 4 wires DOES make sense. 2 wires are for the field winding (the magnet made with DC) and the others are for the Armature (the ones that make power). … The Field winding will be hooked up to its own bridge, runnig full voltage all the time to maintain the magnetic field inside the motor. …