1 Introduction
Three-phase asynchronous motor (Triple - phase asynchronous motor) is to rely on access to 380 v three-phase ac power at the same time (phase difference of 120 degrees) power of the motor, as a result of the three-phase asynchronous motor rotor and the stator rotating magnetic field in the same direction, different speed into a spin, slip, so that three-phase asynchronous motor.
When the three-phase stator winding of the motor after ventilation with balanced three-phase alternating current (ac), will produce a rotating magnetic field, the rotating magnetic field cutting rotor winding, thus produce induced current in the rotor winding, rotor winding is closed path), the rotor of current-carrying conductor under the effect of the stator rotating magnetic field will produce electromagnetic force, as to form the electromagnetic torque on the motor shaft, motor rotation, and the motor rotation direction is the same as the rotating magnetic field direction.
When the conductor cuts the magnetic force line in the magnetic field, the induction current is generated in the conductor, and the name of the "induction motor" comes from this. The combined action of induced current and magnetic field forces the motor rotor.