Question

How does an induction motor works??​

Answer 1

Answer:

Three phase induction motors have a very simple construction composed of a stator covered with electromagnets, and a rotor composed of conductors shorted at each end, arranged as a "squirrel cage". They work on the principle of induction where a rotating electro-magnetic field it created by applying a three-phase current at the stators electromagnets. This in turn induces a current inside the rotor's conductors, which in turns produces rotor’s magnetic field that tries to follow stator’s magnetic field, pulling the rotor into rotation.

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Benefits of AC Induction Motors are:

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

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

They are maintenance free motors unlike dc motors due to the absence 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 meaning that the rotor does not turn at the exact same speed as the stator's rotating magnetic field. Some difference in the rotor and stator speed is necessary in order to create the induction into the rotor. The difference between the two is called the slip. Slip must be kept within an optimal range in order for the motor to operate efficiently. Roboteq AC Induction controllers can be configured to operate in one of three modes:

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

Controlled Slip: a Closed Loop speed where voltage and frequency are controlled in order to keep slip within a narrow range while running at a desired 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.  

See this video from Learning Engineering for a visual illustration on how AC Induction Motors are constructed and work.

                          (in comaday brumm brmmmmm brm brm )

Answer 2

Do you know how electric motors work? The answer is probably yes and no! Although many of us have learned how a basic motor works, from simple science books and web pages such as this, many of the motors we use everyday—in everything from factory machines to electric trains—don't actually work that way at all. What the books teach us about are simple direct current (DC) motors, which have a loop of wire spinning between the poles of a permanent magnet; in real life, the majority of high-power motors use alternating current (AC) and work in a completely different way: they're what we call induction motors and they make very ingenious use of a magnetic field that rotates. Let's take a closer look!