commutator

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com·mu·ta·tor

 (kŏm′yə-tā′tər)
n.
1. A cylindrical arrangement of insulated metal bars connected to the coils of a direct-current electric motor or generator, providing a unidirectional current from the generator or a reversal of current into the coils of the motor.
2. Mathematics In a commutative or noncommutative group, an element of the form ghg-1h-1 where g and h are elements of the group. If g and h commute, the commutator is the identity element.

commutator

(ˈkɒmjʊˌteɪtə)
n
1. (Electronics) a device used to reverse the direction of flow of an electric current
2. (Electrical Engineering) 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

com•mu•ta•tor

(ˈkɒm yəˌteɪ tər)

n.
1.
a. a device for reversing the direction of a current.
b. (in a DC motor or generator) a ring or disk assembly that works to change the frequency or direction of current in the armature windings.
2. Math. 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.
[1830–40]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.commutator - switch for reversing the direction of an electric currentcommutator - switch for reversing the direction of an electric current
electric switch, electrical switch, switch - control consisting of a mechanical or electrical or electronic device for making or breaking or changing the connections in a circuit
References in classic literature ?
'Dudley wanted to show me the commutator on the exhaust-box or the windscreen, or something, and he was just bending over when Eustace jumped out from nowhere and pinned him.
Next, let us introduce a criterion that deals with the boundedness of the commutators of the operators satisfying [L.sup.P] [right arrow] [L.sup.q] off-diagonal estimates, which can be proved in [15].
All Visum surgical light systems come standard with five pole commutators at each 360 degree rotational point to allow for cleaner data and video signal transmission.
Features include bonded neodymium iron boron magnets and diamond-turned commutators for maximum brush life.
A-C motors have no brushes or commutators that can be a source of failure in conventional bush-type d-c units.
The authors in [3] also proved that Calderon-Zygmund operator and commutators are bounded in [L.sup.p]([mu]) for 1 < p < [infinity].
Motor commutators are diamond turned after armature assembly to promote optimum concentricity and long brush life.
Commutators are diamond turned after armature assembly to ensure optimum concentricity and long brush life.
It is well known that commutators play a very important role in harmonic analysis and PDEs.
These switches control the armature current and the motor's torque and speed, eliminating the need for life limiting and electrically arcing mechanical brushes and commutators. These switches are externally controlled via non-contact means.