There are two basic types of electric motors that work with polyphase alternating current, synchronous motors and induction motors.
The synchronous motor is basically a three-phase alternator that works in reverse, where the field magnets are arranged on a rotor and excited by direct current, and the armature coils are divided into three parts and fed with three-phase alternating current. The change of the three current waves in the armature will cause a variable magnetic reaction with the poles of the field magnets, causing the field to rotate at a constant speed, determined by the frequency of the current in the alternating current power line. hose reels parts
The speed of a synchronous motor that is constant will be advantageous in certain appliances, but this type of motor can not be used in applications where the mechanical load on the top of the engine arrives can be very large, since the motor reduces its speed when is low. Synchronous motors may operate with a single-phase power source in view of the inclusion of the circuit elements adapted to achieve a rotational magnetic field.