1 files changed, 20 insertions, 0 deletions
diff --git a/3775/CH7/EX7.4/Ex7_4.sce b/3775/CH7/EX7.4/Ex7_4.sce
new file mode 100644
index 000000000..f0605a583
--- /dev/null
+++ b/3775/CH7/EX7.4/Ex7_4.sce
@@ -0,0 +1,20 @@
+//Ex 7.4 page 261
+
+clc;
+clear;
+close;
+
+Vs=230;// V
+Ton=10;// ms
+Toff=25;// ms
+Ra=2;//ohm
+N=1400;// rpm
+k=0.5;// V/rad/s (back emf constant)
+kt=0.5;// NM-A**-1 (torque constant)
+
+Eb=N*2*%pi*k/60;// V
+Va=Vs*Ton/(Toff);// V
+Ia=(Va-Eb)/Ra;// A
+T=kt*Ia;// Nm
+printf('\n average armature current = %.2f A', Ia)
+printf('\n torque = %.3f Nm', T)