Rotor

Rotor may refer to:

Engineering

 * Rotor (electric), the non-stationary part of an alternator or electric motor, operating with a stationary element so called the stator
 * ROTOR, a former radar project in the UK following the Second World War
 * Rotor (antenna)
 * In mechanical engineering, the rotor is a part of a machine that rotates about its own axis.
 * Helicopter rotor, the rotary wing(s) of a rotorcraft such as a helicopter
 * Rotor (turbine), the rotor of a turbine powered by fluid pressure
 * Rotor (crank), a variable-angle bicycle crank
 * Rotor (brake), the disc of a disc brake, in U.S. terminology
 * Rotor (brake mechanism), a device that allows the handlebars and fork to revolve indefinitely without tangling the rear brake cable - see Detangler
 * Rotor (distributor), a component of the ignition system of an internal combustion engine
 * Pistonless rotary engine

Computing

 * Rotor machine, the rotating wheels used in certain cipher machines, such as the German Enigma machine
 * Rotor (Enigma machine), a rotating part of the German Enigma machine
 * Rotor (software project), the former code name for Microsoft's shared source implementation of its Common Language Infrastructure

Chemistry

 * The rotating part of a centrifuge, which also holds the samples
 * Rigid rotor, a mathematical model for rotating systems (usually molecules)

Medicine

 * Rotor syndrome, a rare liver disorder

Mathematics

 * Rotor (mathematics), an even-graded multivector used to produce rotations and some other affine transformations
 * Curl (mathematics), known as rotor in some countries, a vector operator that shows a vector field's rate of rotation

Other uses

 * SC Rotor Volgograd, a Russian football club
 * Rotor (Sonic the Hedgehog), a fictional character from the Sonic the Hedgehog universe
 * Rotor (ride), the trade name for an amusement ride
 * Rotor (meteorology), a turbulent horizontal vortex that forms in the trough of lee waves
 * Rotor, a space colony in Isaac Asimov's novel Nemesis
 * R.O.T.O.R., a 1987 science fiction/action movie