A DC shunt motor connected to a 120-v line runs at a speed of 1200 rpm when the armature current is...

Question

A DC shunt motor connected to a 120-v line runs at a speed of 1200 rpm when the armature current is 18A. The armature resistance is .1 ohms. Assuming constant field flux, what is the speed when the armature is 50A?(Hint : Speed is directly porportional to counter emf. a)1167.5rpm b)1200rpm c)1263.35rpm d)none of the above Need to see work and formulas to better understand

David · Accepted Answer

Solution:
Motor equation is given by:
VT= terminal voltage 
Eg=back EMF 
Ia=armature current 
Ra=armature resistance
The back emf is the emf which is produced by the rotation of armature conductors. Since its direction is 
opposite to applied voltage hence it is known as back emf .

A DC shunt motor connected to a 120-v line runs at a speed of 1200 rpm when the armature current is 18A. The armature resistance is .1 ohms. Assuming constant field flux, what is the speed when the...

Solution

Answer To This Question Is Available To Download

Related Questions & Answers

Submit New Assignment