Three phase induction Induction Motor motors have a very simple construction made up of a stator covered with electromagnets, and a rotor composed of conductors shorted at each end, arranged as a “squirrel cage”. They focus on the principle of induction in which a rotating electro-magnetic field it produced by applying a three-stage current at the stators electromagnets. Therefore induces a current inside the rotor’s conductors, which in turns generates rotor’s magnetic field that tries to check out stator’s magnetic field, pulling the rotor into rotation.

Great things about AC Induction Motors are:

Induction motors are basic and rugged in building. They are more robust and can operate in any environmental condition

Induction motors are cheaper in expense because of simple rotor construction, lack of brushes, commutators, and slide rings

They are maintenance free motors unlike dc motors due to the absence of brushes, commutators and slip rings

Induction motors can be operated in polluted and explosive environments as they don’t have brushes that may cause sparks

AC Induction motors are Asynchronous Machines and therefore the rotor will not convert at the exact same speed as the stator’s rotating magnetic field. Some difference in the rotor and stator rate is necessary in order to make the induction in to the rotor. The difference between your two is named the slip. Slip must be kept within an optimal range to ensure that the motor to operate efficiently. Roboteq AC Induction controllers could be configured to operate in one of three modes:

Scallar (or Volts per Hertz): an Open loop mode where a order causes a simultaneous, fixed-ratio Frequency and Voltage alter.

Controlled Slip: a Closed Loop speed where voltage and frequency are managed to keep slip within a narrow range while working at a desired speed.

Field Oriented Control (Vector Drive): a Closed Loop Swiftness and Torque control that works by optimizing the rotating field of the stator vs. this of the induced field in the rotor.

Discover this video from Learning Engineering for a visual illustration on how AC Induction Motors are constructed and work.