An induction electric motor or asynchronous motor can be an AC electric motor in which the electric energy in the rotor had a need to generate torque is obtained by electromagnetic induction from the magnetic field of the stator winding. … An induction motor’s rotor could be either wound type or squirrel-cage type.
Great things about AC Induction Motors are:
Induction motors are basic and rugged in construction. They are more robust and can operate in any environmental condition
Induction motors are cheaper in cost due to simple rotor construction, absence of brushes, commutators, and slide rings
They are free of maintenance motors unlike dc motors because of the lack of brushes, commutators and slip rings
Induction motors can be operated in polluted and explosive environments as they do not have brushes that may cause sparks
AC Induction motors are Asynchronous Devices and therefore the rotor will not switch at the precise same speed since the stator’s rotating magnetic field. Some difference in the rotor and stator swiftness is necessary in order to make the induction into the rotor. The difference between the two is named the slip. Slip should be kept within an optimal range to ensure that the motor to operate effectively. Roboteq AC Induction controllers can be configured to operate in one of three modes:
Scallar (or Volts per Hertz): an Open up loop mode where a order causes a simultaneous, fixed-ratio ac motor Frequency and Voltage modify.
Controlled Slip: a Shut Loop speed where voltage and frequency are managed in order to 
keep slip inside a narrow range while working at a desired speed.
Field Oriented Control (Vector Drive): a Closed Loop Quickness 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 about how AC Induction Motors are constructed and function.