Induction Motor

Three phase Induction Motor 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 created by applying a three-phase current at the stators electromagnets. Therefore induces a current within the rotor’s conductors, which in turns generates rotor’s magnetic field that attempts to follow 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 more robust and can operate in virtually any environmental condition

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

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

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

AC Induction motors are Asynchronous Devices meaning that the rotor will not change at the precise same speed since the stator’s rotating magnetic field. Some difference in the rotor and stator rate is necessary to be able to generate the induction in to the rotor. The difference between your two is called 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 another of three modes:

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

Controlled Slip: a Closed Loop speed where voltage and frequency are managed in order to keep slip inside a narrow range while running at a desired speed.

Field Oriented Control (Vector Drive): a Closed Loop Velocity 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.

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