An electrical rotor is a the revolving part of an AC generator or electrical motor. Rotating inside the stator, it consists of a grooved shaft or axle, in which enamelled copper wire is wound. In a generator, the rotor induces electricity in the stator winding. In an electrical motor, the difference in polarity, which constantly alternates with the electron flow direction in the stator, makes the rotor turns about at a high speed inside the stator casing. In motors, the rotatory energy of a rotor has a lot of useful application, as in electrical tools, such as drills, grinders, electrical saw, lathe, etc.