A synchronous electric motor is an AC motor distinguished by a rotor spinning with coils passing magnets at the same rate as the alternating current and resulting magnetic field which drives it. The stepping motor is transformed into a synchronous motor by replacing the wound-wire for the AC power specification. A synchronous motor rotates at a constant speed in proportion to the AC power frequency of which current is applied directly to the wound-wire, while a stepping motor rotates in accordance with the switched phase by the driving circuit.
The 3-Phase Synchronous Motor you will find here are widely used in various fields such as conveyer drives, printers, ultimate freezers, and general industrial devices. Get the detail information of 3-Phase Synchronous Motor Wiring Diagram here – (source: http://db.sanyodenki.co.jp).