Phase Induction in Motor

Three phase induction motors have a very simple construction made up 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 made 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 follow stator’s magnetic field, pulling the rotor into rotation.

Great things about AC Induction Motors are:

Induction motors are basic and rugged in construction. They are better quality and can operate in virtually any environmental condition

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

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

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

AC Induction motors are Asynchronous Machines and therefore the rotor will not change at the specific same speed as the stator’s rotating magnetic field. Some difference in the rotor and stator quickness is necessary in order to produce the induction in to the rotor. The difference between the two is named the slip. Slip must be kept within an optimal range to ensure that the motor to use efficiently. 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 order causes a simultaneous, fixed-ratio Induction in Motor Frequency and Voltage modify.

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

Field Oriented Control (Vector Drive): a Closed Loop Speed 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 on how AC Induction Motors are constructed and work.

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