The difference between single-phase and three-phase motors is the voltage level is different, the use of different occasions, the structure is not the same, single-phase working voltage 220V, three-phase working voltage 380V.
Single phase motor generally refers to single phase asynchronous motor powered by single-phase AC power supply (AC220V). This kind of motor usually has two phase winding on the stator, and the rotor is ordinary squirrel cage type. The distribution of the two phase windings on the stator and the power supply are different, and different starting characteristics and operating characteristics can be produced.
Refers to the three-phase motor, when the three-phase stator winding (the difference between the 120 electrical degrees), pass into the three-phase alternating current, will produce a rotating magnetic field, the rotating magnetic field cutting rotor windings, thus the induced current in the rotor winding (the rotor winding is closed path).
The main application of three-phase motor: such as agricultural machinery, food machinery, fan, water pump, machine tool, mixer, air compressor, etc..
The biggest difference between the two:
High efficiency, energy saving, good performance, small vibration, low noise, long life, high reliability, easy maintenance, high starting torque and so on.