From 7f60ea012dd2524dae921a2a35adbf7ef21f2bb6 Mon Sep 17 00:00:00 2001
From: prashantsinalkar
Date: Tue, 10 Oct 2017 12:27:19 +0530
Subject: initial commit / add all books

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 3574/CH11/EX11.2/EX11_2.sce | 61 +++++++++++++++++++++++++++++++++++++++++++++
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+// Example 11.2
+// Computation of (a) Shunt field current (b) Armature current (c) Developed 
+// torque (d) Armature current if a resistor inserted in series with the shunt 
+// field circuit caused the speed to increase to 900 r/min (e) External 
+// resistance required in series with the shunt field circuit to operate 
+// at 900 r/min
+// Page No. 450
+
+clc;
+clear;
+close;
+
+// Given data
+HP=125;
+perratedload=0.854;          // Percentage rated load
+VT=240;                      // Voltage value of motor
+RF=49.2;                     // Resistance of shunt motor
+Nf=577;                      // Turns per pole of the shunt motor
+Ns=4.5;
+Ra=0.0172;                   // Armature resistance
+RIP=0.005;                   // Interpole winding resistance
+Rs=0.0023;                   // Resistance of series field winding
+n1=850;                      // Speed of shunt motor
+n2=900;
+F2=4000;
+
+// (a) Shunt field current
+
+IF=VT/RF;                    // Field current
+
+// (b) Armature current 
+Pin=HP*746/perratedload;    // Input power 
+IT=Pin/VT;                  // Total current
+Ia1=IT-IF;
+
+// (c) Developed torque 
+
+Racir=Ra+RIP+Rs;
+Ea=VT-Ia1*Racir;            // Armature emf
+Pmech=Ea*Ia1;               // Mechanical power
+TD=Pmech*5252/n1/746;            // Torque developed
+
+// (d) Armature current if a resistor inserted in series with the shunt field 
+// circuit caused the speed to increase to 900 r/min
+
+Ia2=Ia1*n2/n1;
+
+//(e) External resistance required in series with the shunt field circuit to 
+// operate at 900 r/min
+IF2=(F2-0.90*Ns*Ia2)/Nf;
+Rx=(VT/IF2)-RF;
+
+
+// Display result on command window
+printf("\n Shunt field current = %0.2f A ",IF);
+printf("\n Armature current = %0.2f A ",Ia1);
+printf("\n Developed torque = %0.1f lb-ft ",TD);
+printf("\n Armature current if a resistor inserted in series = %0.0f A ",Ia2);
+printf("\n External resistance required = %0.1f Ohm ",Rx);
+
+
-- 
cgit