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see generatorgenerator,
in electricity, machine used to change mechanical energy into electrical energy. It operates on the principle of electromagnetic induction, discovered (1831) by Michael Faraday.
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; motor, electricmotor, electric,
machine that converts electrical energy into mechanical energy. When an electric current is passed through a wire loop that is in a magnetic field, the loop will rotate and the rotating motion is transmitted to a shaft, providing useful mechanical work.
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in engineering. (1) The rotating part of motors and machines, in which are located the members that receive energy from the working medium (for instance, the rotor in a Wankel engine) or that transmit energy to a working medium (for instance, the rotor in a rotary pump). In motors, the rotor is connected to a driving shaft; in machines, it is connected to a driven shaft. Rotors are made in the shape of drums, disks, or wheels.

(2) The rotating part of, as a rule, an alternating-current machine. It is usually a cylindrical body with grooves that contain the winding.



the rotating part of an electric machine. As a rule, the concept of a rotor refers to alternating-current machines; in direct-current machines, the rotor is called an armature.

The rotor of an induction machine is usually fabricated from electrical sheet steel and has the shape of a cylinder with grooves that contain the winding. Depending on the type of winding used, induction machines are classified as either phase-wound or squirrel-cage machines. A phase-wound rotor has a three-phase winding with the same number of sections as are in the stator. The sections are usually Y-connected, and their terminals are connected to a starting rheostat through collector rings and brushes. The winding of a squirrel-cage rotor consists of metal bars that are short-circuited at each end.

Rotors in synchronous machines are classified as salient-pole and nonsalient-pole rotors. A salient-pole rotor consists of a yoke and of poles attached to the yoke and equipped with field windings. A nonsalient pole rotor is usually fabricated as a unit from a single steel forging. Grooves for field winding are milled into the forging.


Kostenko, M. P., and L. M. Piotrovskii. Elektricheskie mashiny, 3rd ed., parts 1–2. Leningrad, 1972–73.



(aerospace engineering)
An assembly of blades designed as airfoils that are attached to a helicopter or similar aircraft and rapidly rotated to provide both lift and thrust.
Disk with a set of input contacts and a set of output contacts, connected by any prearranged scheme designed to rotate within an electrical cipher machine.
Disk whose rotation produces a variation of some cryptographic element in a cipher machine usually by means of lugs (or pins) in or on its periphery.
The rotating member of an electrical machine or device, such as the rotating armature of a motor or generator, or the rotating plates of a variable capacitor.
(mechanical engineering)


i. A system of rotating airfoils whose primary function is to produce lift (e.g., propellers and helicopter rotors).
ii. The portion of a turbine or compressor that spins.
iii. A rotating disc or drum to which a series of blades are attached (e.g., compressor, turbine, turbopump, alternator).
iv. A local air mass rotating about a substantially horizontal axis.


1. the rotating member of a machine or device, esp the armature of a motor or generator or the rotating assembly of a turbine
2. a device having blades radiating from a central hub that is rotated to produce thrust to lift and propel a helicopter
3. the revolving arm of the distributor of an internal-combustion engine
4. a violent rolling wave of air occurring in the lee of a mountain or hill, in which the air rotates about a horizontal axis
References in periodicals archive ?
In fact, I will always uphold the use of rotors because a machine cannot [replace] the human factor in this Kapampangan tradition,' he said.
The studied machine is an ordinary industrial four-pole (2p = 4) induction machine utilizing aluminium single-cage with deep rotor bars to meet the high rotor locked torque with low starting current and low rated slip.
2) The vibration displacement waveforms of rotors exhibit the "waveform cutting" characteristics.
The 51mm diameter rotor provides 36mm of clearance between the scraping blade and the rotor's surface; providing 44 percent more annular space for product and enabling free passage for even large pieces of product.
Originally, the rotors of a tangential mixer turned at different speeds within the mixing chamber, mimicking the friction ratio of a two-roll mill.
Rotor Spinning machine spins yarns from the sliver and the winding mechanism of the machine produces wound cone or cheese.
The magnetic flux density distribution for both the solid and the composite rotors are thus the same.
While we waited for the hand signal to pull chocks and chains, I noticed someone outside the rotor arc pointing at the tail section of the aircraft.
It is well known that the rotor current during starting can be as much as four until seven times the normal full load current and that the effects of these large currents are represented by very large thermal stresses in the rotor circuit.
headquarters, a network of plants and satellite sales offices around the world help Riverside Products manufacture and deliver its rotors and parts to customers, including offices in the United Kingdom.
In a modern variant of that practice, scientists have chemically harnessed bacteria to a micromotor so that they can make the device's rotor slowly turn.
Buyers had little patience for the engine's poor fuel economy, ordinary performance (0-60 mph took almost 13 seconds thanks to the lack of torque and lazy semiautomatic three-speed), thirst for oil (a lot of it found its way past the rotor seals, a problem--in smaller proportions--to this day for rotary engines), and its propensity to self-destruct.