Get efficient motors, ask for our prices! Collector rings and brushes are required which results in high maintenance cost. The rotorwith permanent magnets or electromagnets turns in step with the stator field a⦠Due to the rotating magnetic field, the voltage induced in the stator winding and this voltage is called counter emf (E). Model Diagram and Phasor Diagram of Synchronous Motor Field structure is stimulated by direct current in synchronous motor. Speed remains constant irrespective of the loads in synchronous motors. Let us discuss a little about the equivalent circuit of a Synchronous motor The Stator consists of the core, which is generally made up of steel. It is supplied 3 phase AC power. Electric motor - Electric motor - Synchronous motors: A synchronous motor is one in which the rotor normally rotates at the same speed as the revolving field in the machine. Direct Current (DC) Excited Synchronous Motors. An over excited synchronous-motor has leading power factor and is operated in parallel to induction motors thereby improving the system power factor. All part discuss in briefly in this below section. //