Electrical Engineering ⇒ Topic : Characteristics of a Shunt or Separately-excited DC Motor

Separately excited D.C. motors Characteristics:-

• Possible to obtain very ac-curate speeds.
• Most suitable for applications requiring speed variation from very low value to high value.
  
  Shunt motors 

  Characteristics:-
• Starting torque-medium, 
• usually limited to 250% by a 
• starting resistor but may be 
• increased.
  
• Maximum operating torque usually limited to about 200% by commutation.
  Speed control :
• increase upto 200% speed by field control..
• decrease by armature voltage control.