initial commit / add all books

1 files changed, 25 insertions, 0 deletions

diff --git a/3731/CH5/EX5.4/Ex5_4.sce b/3731/CH5/EX5.4/Ex5_4.sce
new file mode 100644
index 000000000..0774feecb
--- /dev/null
+++ b/3731/CH5/EX5.4/Ex5_4.sce
@@ -0,0 +1,25 @@
+//Chapter 5:DC Motor Drives
+//Example 4
+clc;
+
+//Variable Initialization
+
+//The ratings of the motor are same as that of Ex-5.2
+V1=220      //rated voltage in V
+Ia1=100     //rated current in A
+N1=1000     //speed in rpm clockwise
+N2=800      //given speed during the dynamic braking in rpm
+Ra=0.05     //armature resistance in ohms
+Rs=0.05     //field resistance in ohms
+
+//Solution
+
+T2 = 2   //dynamic torque is twice the rated torque
+Ia2=Ia1*sqrt(T2)   //since T=Kf*Ia**2
+E1=V1-Ia1*(Ra+Rs)
+E2=(Ia2/Ia1)*(N2/N1)*E1    //since E=Ke*Ia*N
+Rb=E2/Ia2-(Ra+Rs)          //since E2=Ia2(Rb+Ra+Rs)  during braking
+
+//Results
+mprintf("\n Braking current Ia2: %.1f A",Ia2)
+mprintf("\n Required braking resistance Rb: %.2f ohm",Rb)