1 files changed, 19 insertions, 0 deletions
diff --git a/3760/CH4/EX4.72/Ex4_72.sce b/3760/CH4/EX4.72/Ex4_72.sce
new file mode 100644
index 000000000..25a5d501b
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+++ b/3760/CH4/EX4.72/Ex4_72.sce
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+clc;
+v=230; // source voltage
+ra=0.1; // resistance of armature
+ia=100; // armature current
+n=1600; // speed of dc shunt motor
+wl=300; // friction and windage losses
+lo=1200; // no load core loss 
+lc=2500; // copper losses
+Ls=0.01; // stray losses as a fraction of output
+Ea=v-ia*ra; // counter EMF
+pe=Ea*ia; // electromagnetic power
+wo=wl+lo; // no load rotational losses
+po=pe-wo; // shaft power + stray load losses
+psh=po/(1+Ls);
+Tsh=(psh*60)/(2*%pi*n); 
+printf('Shaft torque is %f Nm\n',Tsh);
+pi=pe+lc; // power input to motor
+nm=(psh/pi)*100;
+printf('Motor efficiency is %f percent',nm);