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Induction Motor

Three phase induction 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 principle of induction in which a rotating electro-magnetic field it produced by applying a three-phase current at the stators electromagnets. This in turn induces a current inside the rotor’s conductors, which in turns generates rotor’s magnetic field that attempts to check out stator’s magnetic field, pulling the rotor into rotation.

Benefits of AC Induction Motors are:

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

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

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

Induction motors can be operated in polluted and explosive environments as they do not have brushes which can cause sparks

AC Induction motors are Asynchronous Machines and therefore the rotor will not convert at the precise 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 your two is called the slip. Slip should be kept in a optimal range in order for the motor to operate effectively. Roboteq AC Induction controllers can be configured to operate in one of three modes:

Scallar (or Volts per Hertz): an Open up loop mode where a Induction Motor china Control causes a simultaneous, fixed-ratio Frequency and Voltage change.

Controlled Slip: a Closed Loop speed where voltage and frequency are managed to keep slip within a narrow range while operating at a preferred speed.

Field Oriented Control (Vector Drive): a Closed Loop Speed 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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