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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 ?
Provide 2 copies DTR generator rotor after modernization.
The use of separate drives turning each rotor independently, so that the relative speed and/or orientation of the rotors can be changed during the mixing cycle, can be employed.
John Stelk, Riverside Products manager of engineering and a 30-year company veteran, says the extra weight of the Revolution Rotor translates into additional momentum and inertia, which ultimately reduces the electrical current needed to run the rotor, leading to electrical savings for shredders.
Following is a brief description of the results from copper rotor motors tested in application.
lower passage ratio) and the relationship was independent of rotor speed, rotor type and passing velocity.
A helicopter attempted to aid in descent of the airship by hovering overhead and forcing it down with rotor wash.
The North American rotor blade annual installations declined 47% in 2010 largely due to the financial crunch and decline in natural gas prices in the US.
Since the Victoria Mathias installed the towers and nacelles in the past few months, the second installation vessel Friedrich Ernestine is installing the rotor blades of the wind turbines.
The 51mm diameter rotor provides 36mm of clearance between the scraping blade and the rotor's surface; providing 44% more annular space for product and enabling free passage for even large pieces of product.
These include modified and/or new rotor designs, improved chamber designs, improved rotor cooling and improved product discharging, to name a few.
Fourteen models of open, solid, or staggered rotor designs.