Three-phase asynchronous motor is a kind of motor that relies on the simultaneous access to 380V three-phase ac power supply (phase difference of 120 degrees), because the rotor and stator of three-phase asynchronous motor rotating magnetic field in the same direction, different speed into rotation, there is a slip, so called three-phase asynchronous motor.

Three-phase asynchronous motor manufacturers according to the three phase asynchronous motor rotor structure, can be divided into squirrel cage motor and winding motor.

According to the protection type of three-phase asynchronous motor, it can be divided into open-type (IP11) three-phase asynchronous motor, protected three-phase asynchronous motor (IP22 and IP23), enclosed three-phase asynchronous motor (IP44), explosion-proof three-phase asynchronous motor. Open type (IP11) : low price, good heat dissipation conditions, because the rotor and winding are exposed to the air, can only be used for dry, little dust, no corrosive and explosive gas environment.

Protective type (IP22 and IP23) : good ventilation and heat dissipation conditions can prevent water droplets, iron scraps and other external debris from falling into the inside of the motor. It is only suitable for dry environment with little dust and no corrosive and explosive gas. Enclosed type (IP44) : it is widely used in humid, dusty, vulnerable to wind and rain erosion, corrosive gas and other harsh working environment. According to the ventilation and cooling mode of three-phase asynchronous motor, it can be divided into self-cooling three-phase asynchronous motor, self-fanning three-phase asynchronous motor, non-fanning three-phase asynchronous motor and duct-ventilated three-phase asynchronous motor.

According to the installation structure of three-phase asynchronous motor, it can be divided into horizontal three-phase asynchronous motor, vertical three-phase asynchronous motor, three-phase asynchronous motor with foot, three-phase asynchronous motor with flange. According to the insulation level of three-phase asynchronous motor, it can be divided into E class, B class, F class and H class three-phase asynchronous motor. According to the work quota, can be divided into continuous three-phase asynchronous motor, discontinuous three-phase asynchronous motor, intermittent three-phase asynchronous motor.

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