DC Shunt Motor - Working Principle, Circuit Diagram

In DC motors the connections of the field windings, as well as the armature, can be done parallel which is known as DC shunt motor, also known as a shunt wound DC motor.

DC Shunt Motor -Circuit Diagram

DC Shunt Motor -Circuit Diagram


Examining the Characteristics of DC Shunt Motors

Because both windings of this motor will expose to the equal voltage power supply, this motor maintains an invariable speed with any kind of load. This motor has a low starting torque and also runs at a constant speed.

Characteristics of DC Shunt Motors

Characteristics of DC Shunt Motors

Why so?  Magnetic field flux  of the field winding = const. If load ↑  =>  n ↓ => Back EMF within the armature ↓ => IArmature ↑ => Armature field ↑  => T ↑  => n ↑


Reversing a shunt motor

The direction of rotation of a DC shunt motor can be reversed by changing the polarity of either the armature coil or the field coil.

Reversing the direction of rotation of the shunt motor on the motor terminal board

Reversing the direction of rotation of the shunt motor on the motor terminal board


Application

These motors are used wherever stable speed is required. This kind of DC motor can be used to drive Centrifugal Pumps, Conveyors, Lifts, Weaving Machine, Lathe Machines, Blowers, Fans, etc.


Video

  • 0:00  Introduction DC motors
  • 0:29  How torque can be created
  • 1:50  Permanent Magnet DC (PMDC)
  • 3:00  Controlling with H-Bridge
  • 4:46  Series DC motor
  • 7:36  DC Shunt motor
  • 9:26  Others (Compound DC motor, Universal motor)