diff options
Diffstat (limited to '3760/CH6/EX6.34')
| -rw-r--r-- | 3760/CH6/EX6.34/Ex6_34.sce | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/3760/CH6/EX6.34/Ex6_34.sce b/3760/CH6/EX6.34/Ex6_34.sce new file mode 100644 index 000000000..69f94a821 --- /dev/null +++ b/3760/CH6/EX6.34/Ex6_34.sce @@ -0,0 +1,17 @@ +clc;
+f1=50; // rated frequency of 3- phase induction motor
+f2=40; // applied frequency
+vr=0.9; // ratio of applied voltage to rated voltage
+m=3; // number o phases
+fr=f2/f1; // ratio of frequencies
+ir=fr/vr;
+printf('Ratio of starting current at %d Hz to starting current at %d Hz is %f \n',f1,f2,ir);
+tr=(m/f1)*(f2/m)*(fr/vr)^2;
+printf('Ratio of starting torque at %d Hz to starting torque at %d Hz is %f \n',f1,f2,tr);
+tmr=(m/f1)*(f2/m)*(fr/(vr)^2);
+printf('Ratio of maximum torque at %d Hz to maximum torque at %d Hz is %f \n',f1,f2,tmr);
+vr1=sqrt((m/f1)*(f2/m)*fr^2);
+printf('For the same starting torque ratio of voltage at %d Hz to ratio of voltage at %d Hz is %f\n',f2,f1,vr1);
+vr2=sqrt((m/f1)*(f2/m)*fr);
+printf('For the same maximum torque ratio of voltage at %d Hz to ratio of voltage at %d Hz is %f\n',f2,f1,vr2);
+// answer for ratio of v2/v1 for same starting torque is slightly different from what is given in book
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