Phase Induction in Motor

Three phase induction Induction in Motor motors have a very 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 principle of induction where a rotating electro-magnetic field it developed through the use of 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 follow stator’s magnetic field, pulling the rotor into rotation.

Benefits of AC Induction Motors are:

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

Induction motors are cheaper in expense because of simple rotor construction, lack of brushes, commutators, and slide rings

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

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

AC Induction motors are Asynchronous Machines and therefore the rotor does not turn at the specific same speed since the stator’s rotating magnetic field. Some difference in the rotor and stator speed is necessary to be able to make the induction in to the rotor. The difference between the two is named the slip. Slip should be kept in a optimal range to ensure that the motor to operate efficiently. Roboteq AC Induction controllers could be configured to operate in one of three modes:

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

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

Field Oriented Control (Vector Drive): a Closed Loop Rate and Torque control that works 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 on how AC Induction Motors are constructed and work.

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