Epäsynkronimoottorit

Epäsynkronimoottorit, also known as induction motors, are a type of electric motor widely used in various industrial and domestic applications. Their operation relies on the principle of electromagnetic induction to produce torque. Unlike synchronous motors, the rotor in an induction motor rotates at a speed slightly slower than the rotating magnetic field of the stator. This difference in speed is called slip, and it is essential for generating the induced current in the rotor that creates the magnetic field necessary for torque production.

The stator of an induction motor consists of a set of windings that, when supplied with AC power, create a rotating magnetic field. The rotor typically comprises conductive bars or windings short-circuited at the ends, forming a cage-like structure (hence the common term "squirrel-cage motor"). As the stator's magnetic field sweeps across the rotor conductors, it induces a voltage and current in them. This induced current, in turn, generates its own magnetic field in the rotor, which interacts with the stator's field, causing the rotor to spin. The speed of the motor is determined by the frequency of the AC supply and the number of poles in the stator winding, as well as the slip. Induction motors are favored for their robustness, simplicity, low cost, and reliability, making them a dominant choice for many applications.