Phase Induction in Motor

Three phase induction 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 theory of induction in which a rotating electro-magnetic field it created by applying a three-phase current at the stators electromagnets. This in turn induces a current within the Induction in Motor rotor’s conductors, which in turns produces 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 simple and rugged in structure. They are more robust 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 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 which can cause sparks

AC Induction motors are Asynchronous Devices meaning that the rotor does not change at the specific same speed since the stator’s rotating magnetic field. Some difference in the rotor and stator swiftness is necessary to be able to create the induction into the rotor. The difference between the two is named the slip. Slip should be kept in a optimal range in order for the motor to use effectively. Roboteq AC Induction controllers could be configured to operate in one of three modes:

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

Controlled Slip: a Shut 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 Acceleration and Torque control that functions by optimizing the rotating field of the stator vs. this of the induced field in the rotor.

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

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