Synchronous motor is an ac motor with the same rotating speed as the stator rotating field. The rotation speed of the rotor is n=60f/p with the logarithmic p and the power frequency f.
The speed n depends on the power frequency f, so the power supply frequency must be constant, the speed is constant, and it has nothing to do with the load.
It has the characteristics of high operation stability and overload capacity. It is often used in multi-machine synchronous transmission system, precision speed control system and large equipment.
Technical Data
Rated voltage AC(220/380) of the three-phase synchronous machine;
Excitation voltage DC 24/42v;

Ltekonline are the manufacturers of 3 Phase Synchronous Motor used to demonstrate engineering principles in Engineering Colleges, Engineering Schools and Electrical Machine Trainer for Engineering Teaching Lab in Universities