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Diffstat (limited to '3574/CH10/EX10.11/EX10_11.sce')
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diff --git a/3574/CH10/EX10.11/EX10_11.sce b/3574/CH10/EX10.11/EX10_11.sce new file mode 100644 index 000000000..ff1d72fb3 --- /dev/null +++ b/3574/CH10/EX10.11/EX10_11.sce @@ -0,0 +1,48 @@ +// Example 10.11
+// Determine (a) Electrical losses (b) Rotational losses (c) Efficiency
+// Page No. 430
+
+clc;
+clear;
+close;
+
+// Given data
+T=124; // Hp rating of motor
+Rf=32.0; // Field resistance
+VT=240; // Rated voltade of the machine
+IT=420; // Total current
+Ra=0.00872; // Armature resistance
+RipRcw=0.0038; // Resistance of interpolar winding and compensating windings
+Pout=92504;
+Vb=2.0; // Rated speed of the machine
+Racir=Ra+RipRcw;
+
+// (a) Electrical losses
+
+If=VT/Rf; // Field current
+Ia=IT-If; // Armature current
+Pf=If^2*Rf; // Field power
+Paipcw=Ia^2*(Ra+RipRcw);
+Pb=Vb*Ia; // Brush loss power
+Plosses=Pf+Paipcw+Pb; // Total power loss
+
+// (b) Rotational losses
+
+Ea=VT-(Ia*Racir)-Vb; // Armature emf
+Pmech=Ea*Ia; // Mechanical power
+Pshaft=T*746; // Shaft power
+Protational=Pmech-Pshaft;
+
+// (c) Ffficiency
+
+eeta=Pout/(VT*IT)*100;
+
+// Display result on command window
+
+printf("\n Electrical losses = %0.1f W ",Plosses);
+printf("\n Rotational losses = %0.0f W ",Protational);
+printf("\n Efficiency = %0.1f Percent ",eeta);
+
+
+
+
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