Basic knowledge about the motor（9）

Basic knowledge about the motor

30. The rotor of synchronous motor has two types: hidden pole and salient pole.

31. The equivalent phase number of the squirrel cage rotor is equal to the number of slots, and the equivalent number of turns per phase is 1/2.

32. Three-phase symmetrical AC winding, symmetrical three-phase AC current, whose fundamental wave magnetomotive force is a circular

rotating magnetomotive force, whose direction of rotation is from the axis of the leading phase winding to the axis of the lag phase, and then to the next The axis of a lagging phase.

33. The three-phase winding of the three-phase transformer has two connection methods: star and triangle; the magnetic circuit has two structures, a group and a heart.

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