commutator

[ kom-yuh-tey-ter ]

/ ˈkɒm yəˌteɪ tər /

noun

Electricity.

a device for reversing the direction of a current.
(in a DC motor or generator) a cylindrical ring or disk assembly of conducting members, individually insulated in a supporting structure with an exposed surface for contact with current-collecting brushes and mounted on the armature shaft, for changing the frequency or direction of the current in the armature windings.

Mathematics. the element equal to the product of two given elements in a group multiplied on the right by the product of the inverses of the elements.

Origin of commutator

First recorded in 1830–40; commutate + -or²

Words nearby commutator

commutation, commutation ticket, commutative, commutative group, commutative law, commutator, commutator group, commute, commuter, commuter airplane, commuter belt

Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for commutator

As armature, commutator, and shaft rotate, the brushes connect first with one segment of the commutator and then with the other.
General Science|Bertha M. Clark
It is best to have these ends terminate on the commutator side of the frame.
The Boy Mechanic, Book 2|Various
In this case each of the motor circuits is connected to two diametrically opposite bars of the commutator.
The inventions, researches and writings of Nikola Tesla|Thomas Commerford Martin
In this figure the brushes are arranged to make contact with the outer surface of the ring C, which is the commutator.
Appletons' Popular Science Monthly, January 1900|Various

The commutator part of the motor should be enclosed so that there may be no possibility of a spark igniting the film.
Motion Picture Operation, Stage Electrics and Illusions|Henry C. Horstmann

British Dictionary definitions for commutator

commutator

/ (ˈkɒmjʊˌteɪtə) /

noun

a device used to reverse the direction of flow of an electric current

the segmented metal cylinder or disc mounted on the armature shaft of an electric motor, generator, etc, used to make electrical contact with the rotating coils and ensure unidirectional current flow

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for commutator

commutator

[ kŏm′yə-tā′tər ]

The arrangement of contact points in an electric motor connecting an external direct current power supply and the rotating electric coils that use the power, used to generate the AC voltages needed by the coils. The commutator is located at the rotating shaft of the motor, where two power contacts are swept underneath two metal brushes, supplying positive and negative voltage to the coils. When the motor has rotated 180 degrees, the power contacts are each moving under the opposite brush, reversing the polarity of the voltage supplied to the coils.

In a group or an algebra, an element of the form ghg-1h-1 where g and h are elements of the group or algebra. If g and h commute, the commutator is the identity element. The commutator is often written [g, h].

单词	commutator
释义	commutator [ kom-yuh-tey-ter ] / ˈkɒm yəˌteɪ tər / noun Electricity. a device for reversing the direction of a current. (in a DC motor or generator) a cylindrical ring or disk assembly of conducting members, individually insulated in a supporting structure with an exposed surface for contact with current-collecting brushes and mounted on the armature shaft, for changing the frequency or direction of the current in the armature windings. Mathematics. the element equal to the product of two given elements in a group multiplied on the right by the product of the inverses of the elements. Origin of commutator First recorded in 1830–40; commutate + -or² Words nearby commutator commutation, commutation ticket, commutative, commutative group, commutative law, commutator, commutator group, commute, commuter, commuter airplane, commuter belt Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 Example sentences from the Web for commutator As armature, commutator, and shaft rotate, the brushes connect first with one segment of the commutator and then with the other. General Science\|Bertha M. Clark It is best to have these ends terminate on the commutator side of the frame. The Boy Mechanic, Book 2\|Various In this case each of the motor circuits is connected to two diametrically opposite bars of the commutator. The inventions, researches and writings of Nikola Tesla\|Thomas Commerford Martin In this figure the brushes are arranged to make contact with the outer surface of the ring C, which is the commutator. Appletons' Popular Science Monthly, January 1900\|Various The commutator part of the motor should be enclosed so that there may be no possibility of a spark igniting the film. Motion Picture Operation, Stage Electrics and Illusions\|Henry C. Horstmann British Dictionary definitions for commutator commutator / (ˈkɒmjʊˌteɪtə) / noun a device used to reverse the direction of flow of an electric current the segmented metal cylinder or disc mounted on the armature shaft of an electric motor, generator, etc, used to make electrical contact with the rotating coils and ensure unidirectional current flow Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Scientific definitions for commutator commutator [ kŏm′yə-tā′tər ] The arrangement of contact points in an electric motor connecting an external direct current power supply and the rotating electric coils that use the power, used to generate the AC voltages needed by the coils. The commutator is located at the rotating shaft of the motor, where two power contacts are swept underneath two metal brushes, supplying positive and negative voltage to the coils. When the motor has rotated 180 degrees, the power contacts are each moving under the opposite brush, reversing the polarity of the voltage supplied to the coils. In a group or an algebra, an element of the form ghg-1h-1 where g and h are elements of the group or algebra. If g and h commute, the commutator is the identity element. The commutator is often written [g, h]. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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