Phase Induction in Motor

Three phase induction motors have a very simple construction composed of a stator protected with electromagnets, and a rotor composed of conductors shorted at each end, arranged as a “Induction in Motor squirrel cage”. They focus on the principle of induction where a rotating electro-magnetic field it developed through the use of a three-stage current at the stators electromagnets. This in turn induces a current within the rotor’s conductors, which in turns produces 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 construction. They are more robust 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 free of maintenance motors unlike dc motors due to the absence 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 Devices and therefore the rotor will not switch 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 generate the induction in to 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 where a command causes a simultaneous, fixed-ratio Frequency and Voltage alter.

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 preferred speed.

Field Oriented Control (Vector Drive): a Closed Loop Swiftness and Torque control that functions 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 about how AC Induction Motors are constructed and work.

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