Home ยป Synchronous Motors
Electrical Theory

Synchronous Motors

Synchronous motors are like induction motors in that they both have stator windings that produce a rotating magnetic field. Unlike an induction motor, the synchronous motor is excited by an external DC source and, therefore, requires slip rings and brushes to provide current to the rotor.

In the synchronous motor, the rotor locks into step with the rotating magnetic field and rotates at synchronous speed. If the synchronous motor is loaded to the point where the rotor is pulled out of step with the rotating magnetic field, no torque is developed, and the motor will stop.

A synchronous motor is not a self-starting motor because torque is only developed when running at synchronous speed; therefore, the motor needs some type of device to bring the rotor to synchronous speed.

Synchronous Motor Principle

Figure : Wound Rotor

Synchronous motors use a wound rotor. This type of rotor contains coils of wire placed in the rotor slots. Slip rings and brushes are used to supply current to the rotor. (as shown in above Figure).

Related Articles

AC Motor Theory

S Bharadwaj Reddy

Low Voltage Protection (LVP) and Low Voltage Release (LVR)

S Bharadwaj Reddy

Battery Terminology

S Bharadwaj Reddy

Wiring Diagram

S Bharadwaj Reddy

DC Circuit Analysis Loop Equations

S Bharadwaj Reddy

Single Phase AC Induction Motors

S Bharadwaj Reddy

Leave a Comment

This website uses cookies to improve your experience. We'll assume you're ok with this, but you can opt-out if you wish. Accept Read More

Synchronous Motors

WordPress Image Lightbox

Send this to a friend