Induction Motor

Three phase induction motors employ a simple construction composed of a stator protected 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 produced by applying a three-phase current at the stators electromagnets. This in turn induces a current in the rotor’s conductors, which in turns creates rotor’s magnetic field that tries 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 construction. They are better quality and can operate in virtually any environmental condition

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

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

Induction motors could be operated in polluted and explosive environments as they do not have Induction Motor brushes which can cause sparks

AC Induction motors are Asynchronous Devices and therefore the rotor will not turn at the exact same speed because the stator’s rotating magnetic field. Some difference in the rotor and stator velocity is necessary to be able to create the induction in to the rotor. The difference between your two is called the slip. Slip must be kept within an optimal range to ensure that the motor to use effectively. Roboteq AC Induction controllers could be configured to operate in another of three modes:

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

Controlled Slip: a Shut Loop speed where voltage and frequency are controlled to keep slip inside a narrow range while working 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.

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

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