Induction Motor

Three phase induction motors have a very Induction Motor simple construction made up of a stator covered with electromagnets, and a rotor made up of conductors shorted at each end, arranged as a “squirrel cage”. They focus on the principle of induction where a rotating electro-magnetic field it developed by applying a three-phase current at the stators electromagnets. Therefore induces a current within the rotor’s conductors, which in turns produces rotor’s magnetic field that tries to check out 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 better quality and can operate in any environmental condition

Induction motors are cheaper in expense due to simple rotor construction, lack of brushes, commutators, and slip rings

They are free of maintenance motors unlike dc motors due to the absence of brushes, commutators and slip rings

Induction motors can be operated in polluted and explosive conditions as they do not have brushes that may cause sparks

AC Induction motors are Asynchronous Machines and therefore the rotor will not switch at the specific same speed as the stator’s rotating magnetic field. Some difference in the rotor and stator acceleration is necessary to be able to make the induction in to 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 effectively. Roboteq AC Induction controllers can be configured to operate in another of three modes:

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

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

Field Oriented Control (Vector Drive): a Closed Loop Rate and Torque control that functions 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 work.

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