Three Phase Asynchronous Motor

In asynchronous motors the induction principle is used, whereby a conductor is placed in an electromagnetic field which is then influenced by a force, which tries to move it through the magnetic field. In the AC induction motor the magnetic field is placed in the stationary part (stator). The conductors influenced by the electromagnetic force are located in the rotor.

The stator consists (usually) of 3 windings (phases) displaced 120 electrical degrees apart. When fed by a 3 phase alternating current they induce a current in the conductors of the rotor. The interaction of the magnetic field produced by the stator and the current carrying conductors in the rotor causes the rotor to be 'dragged' round by the stator field.

Applications include hoists, cranes conveyer belts, traction control, washing machines, HVAC systems.

See detailed circuit diagrams below and device recommendations.

3 Phase Motor Control