2, the synchronous electric machinery that rotor does not need excitation
Rotor not electromotor can apply the synchronism of excitation to go up at single-phase power source, also can apply go up at polyphase power source. In this kind of electromotor, the stator that has a kind stator winding and split phase electromotor or polyphase electromotor is similar, have rotor of a squirrel cage at the same time, and the surface of rotor cuts plane, if pursue,2 are shown. It is to belong to so show extremely rotor, rotor magnetic pole magnetizes steel make it by a kind, and often can keep magnetic. Squirrel cage winding uses generation to start torsion, and when the rotate speed with rotate certain when electromotor, rotor is shown extremely achieve synchronism with respect to the voltaic frequency that follows stator coil. Show extremely polarity comes out by stator induction, should go up with stator because of its amount extremely number is equal, when electromotor turns to its due speed, squirrel cage winding lost action, maintain rotating is recumbent rotor and magnetic pole follow stator magnetic pole, those who make is synchronous.
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