A device that commutates an electric current, esp. a split-ring metallic conductor that spins rapidly with the armature of a DC motor or generator while in contact with the fixed brushes.
Webster's New World
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.
Other Word Forms of Commutator
Commutator Sentence Examples
The armature carries on its shaft a commutator made of silver slips, and the current is fed into the armature by means of brushes of silver wire.
In this new form of bobbin, the armature consisted of a ring of iron wire wound over with an endless coil of wire and connected to a commutator consisting of copper bars insulated from one another.
The effect is most easily shown by connecting a voltaic cell to a thermopile for a short interval, then quickly (by means of a suitable key, such as a Pohl commutator with the cross connectors removed) disconnecting the pile from the cell and connecting it to a galvanometer, which will indicate a current in the reverse direction through the pile, and approximately proportional to the original current in intensity, provided that the other conditions of the experiment are constant.
Expanding an iterated commutator produces a complicated and long expression.
A group whose commutator factor group is finite can only have finite nilpotent quotient groups.