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Electrical machines are classified into two..

Motor.
Generator.
There are two kinds of motor.

AC motor.
DC motor.
There are two types of three phase motor.

Synchronous motor.
Asynchronous motor.
The essential difference between asynchronous and synchronous motor , slip presents in asynchronous engine .At running condition slide of an asynchronous motor lies from 0 to at least one 1. . In asynchronous motor both starting and working torque is required. Asynchronous motor has moderate starting torque . Asynchronous motor is certainly a single fed electric motor.In asynchronous motor field is stationary armature rotates .

Three phase synchronous machines have a stationary three phase armature and a wound rotor. They are of two types:

synchronous generator or Alternator: Primary workhorse of the power 12v Motor generation industry; they are rotated mechanically by a primary mover at synchronous acceleration and it creates three phase electricity. Picture of PMA used in cars:
2. Synchronous motor: These are continuous speed three phase devices capable of working at synchronous velocity. They are mostly found in constant rate mechanical drives. They are better compared to induction motors.
A synchronous machine has derived its name from the concept that the rotor will rotate in synchronicity with the rotating magnetic field.

In other words, for a 2 Pole machine (electric motor) the rotating magnetic field rotates at 3000 rpm; the rotor of synchronous machine also rotates at the same quickness i.electronic. 3000 rpm. This is achieved through special constructional features in manufacturing this types of machines. There is no slip in synchronous machines like regular induction motors.

Normally three phase supply is available commercially and the design is also designed for the same. That is why ‘three phase’ is certainly added with synchronous machine name.