Sünkroonmootoris

Sünkroonmootoris is a type of AC electric motor that operates at a constant speed, determined by the frequency of the AC power supply and the number of poles in the motor. Unlike induction motors, the rotor of a sünkroonmootoris rotates at exactly the same speed as the rotating magnetic field of the stator. This synchronous speed is calculated by the formula: speed (rpm) = (120 * frequency (Hz)) / number of poles.

The rotor of a sünkroonmootoris is typically magnetized, either by permanent magnets or by DC current supplied to field windings. This magnetized rotor locks in with the rotating magnetic field of the stator, forcing it to rotate at the synchronous speed. This characteristic makes sünkroonmootoris ideal for applications where precise speed control is essential, such as in clocks, timers, and record players. They are also used in larger industrial applications where constant speed is a requirement, like compressors and pumps.

A key advantage of sünkroonmootoris is their ability to operate at unity power factor or even leading power factor, which can improve the overall power factor of an electrical system. However, they require a starting mechanism, as they cannot start themselves from a standstill. This is often achieved using an auxiliary induction winding or by using a variable frequency drive.