Induction Motor

Three phase induction motors employ a simple construction composed of a stator covered with electromagnets, and a rotor made up of conductors shorted at each end, arranged as a “squirrel cage”. They work on the theory of induction in which a rotating electro-magnetic field it developed by applying a three-phase current at the stators electromagnets. Therefore induces a current in the rotor’s conductors, which in turns generates rotor’s magnetic field that attempts to check out stator’s magnetic field, pulling the rotor into rotation.

Benefits of AC Induction Motors are:

Induction motors are basic and rugged in building. They are better quality and can operate in any environmental condition

Induction motors are cheaper in expense due to simple rotor construction, absence of brushes, commutators, and slip rings

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

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

AC Induction motors are Asynchronous Devices meaning that the rotor will not switch at the specific same speed since the stator’s rotating magnetic field. Some difference in the rotor and stator rate is necessary in order to develop the induction in to the rotor. The difference between your two is named the slip. Slip should be kept within an optimal range to ensure that the motor to use efficiently. 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 control causes a simultaneous, fixed-ratio Frequency and Voltage modify.

Controlled Slip: a Shut Loop speed where voltage and frequency are controlled in order to keep slip inside a narrow range while Induction Motor operating at a preferred speed.

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

Observe this video from Learning Engineering for a visual illustration about how AC Induction Motors are constructed and function.

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