Induction Motor

Three phase induction motors employ a simple construction made up of a stator protected with electromagnets, and a rotor composed 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. This in turn induces a current inside 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 simple and rugged in construction. 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 slip 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 don’t have Induction Motor brushes which can cause sparks

AC Induction motors are Asynchronous Devices and therefore the rotor does not turn at the specific same speed because the stator’s rotating magnetic field. Some difference in the rotor and stator velocity is necessary in order to produce the induction into the rotor. The difference between the two is called the slip. Slip should be kept in a optimal range in order for the motor to use effectively. Roboteq AC Induction controllers can be configured to operate in another of three modes:

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

Controlled Slip: a Closed Loop speed where voltage and frequency are controlled to keep slip within a narrow range while running at a preferred speed.

Field Oriented Control (Vector Drive): a Closed Loop Speed and Torque control that functions 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.

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