Phase Induction in Motor

Three phase induction Induction in Motor motors employ a simple construction made up of a stator covered with electromagnets, and a rotor composed of conductors shorted at each end, arranged as a “squirrel cage”. They work on the basic principle of induction where a rotating electro-magnetic field it created through the use of 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 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 virtually any environmental condition

Induction motors are cheaper in expense due to simple rotor construction, lack of brushes, commutators, and slip 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 environments as they do not have brushes which can cause sparks

AC Induction motors are Asynchronous Machines meaning that the rotor does not convert at the exact same speed since the stator’s rotating magnetic field. Some difference in the rotor and stator quickness is necessary to be able to produce the induction into the rotor. The difference between the two is called the slip. Slip should be kept in a 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 where a control causes a simultaneous, fixed-ratio Frequency and Voltage alter.

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

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

Find this video from Learning Engineering for a visual illustration on how AC Induction Motors are constructed and work.

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