Phase Induction in Motor

Three phase induction Induction in Motor motors employ a 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 focus on the basic principle of induction in which a rotating electro-magnetic field it made by applying a three-phase current at the stators electromagnets. Therefore induces a current inside 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.

Great things about AC Induction Motors are:

Induction motors are simple and rugged in building. They are more robust and can operate in virtually any environmental condition

Induction motors are cheaper in expense because of simple rotor construction, absence 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 environments as they do not have brushes that may cause sparks

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

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

Controlled Slip: a Shut Loop speed where voltage and frequency are controlled to keep slip inside a narrow range while working at a desired 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.

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

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