单词	commutator
释义	commutator /ˈkɒmjʊˌteɪtə / noun 1An attachment, connected with the armature of a motor or dynamo, through which electrical connection is made and which ensures the current flows as direct current.It may also increase efficiency of machines as there won't be frictional effects of brushes, commutators, etc, on the motor itself.... He went on to build an electric motor in 1832 and invented the commutator, an integral part of most modern electric motors. One of the places you need them is in modern small motors which don't have a commutator. 1.1A device for reversing the direction of flow of electric current.The commutator must switch current to the correct drive magnets in the correct direction at the correct time in order to produce desired rotor movement.... Note how the commutator reverses the current each time the coil turns halfway.
随便看	mammitis mammock mammogen mammogenesis stupefaction stupefactive stupefier stupefy stupefying stupefyingly stupendous stupendously stupendousness stupid stupidity stupidly stupidness stupor stuporific stuporous Sturbridge sturdied sturdily sturdiness sturdy

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