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Jump to: navigation, search Rotor (lower left) and stator (upper right) of an electric motor Rotor from Hoover Dam generatorThe rotor is the non-stationary part of a rotary electric motor, electric generator or alternator, which rotates because the wires and magnetic field of the motor are arranged so that a torque is developed about the rotor's axis. In some designs, the rotor can act to serve as the motor's armature, across which the input voltage is supplied.
A rotor can act to serve as the motor's armature. Guess you can see how I got confused.