diff options
Diffstat (limited to '3760/CH6/EX6.44/Ex6_44.sce')
-rw-r--r-- | 3760/CH6/EX6.44/Ex6_44.sce | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/3760/CH6/EX6.44/Ex6_44.sce b/3760/CH6/EX6.44/Ex6_44.sce new file mode 100644 index 000000000..a73fecad5 --- /dev/null +++ b/3760/CH6/EX6.44/Ex6_44.sce @@ -0,0 +1,23 @@ +clc;
+p=6; // number of poles
+m=3; // number of phases
+f=50; // frequency of motor
+P=40000; // rated power of induction motor
+v=400; // rated voltage of induction motor
+// results of blocked rotor test
+vb=200; // applied voltage
+ib=110; // applied current
+pf=0.4; // power factor
+f1=45; // frequency at starting torque is to be determined
+e=380; // voltage at starting torque is to be determined
+vbp=vb/sqrt(3); // per phase voltage during blocked rotor test
+zb=vbp/ib; // total impedance referred to stator
+R=zb*pf; // net resistance referred to stator
+X=zb*(sqrt(1-pf^2)); // net reactance referred to stator
+X=X*(f1/f); // net reactance at frequency=45
+Z=R+X*%i; // impedance at frequency=45
+v1=e/sqrt(3); // per phase stator
+is=v1/(Z); // starting current
+ws=(4*%pi*f)/p; // synchronous speed
+T=(3/ws)*abs(is)^2*(R/2);
+printf('Starting torque is %f Nm',T);
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