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+// Example 11.4

+// Computation of resistance using linear approximation and values are 

+// compared with results obtained in example 11.1

+// Page No. 456

+clc;

+clear;

+close;

+

+// Given data

+HP=40;                   // hp rating of the device

+%ratedload=0.902;        // Percentage rated load

+VT=240;                  // Voltage value of motor

+RF=99.5;                 // Resistance of shunt motor

+Nf=1231;                 // Turns per pole of the shunt motor

+Ra=0.0680;               // Armature resistance

+RIP=0.0198;              // Interpole winding resistance

+Rs=0.00911;              // Resistance of series field winding

+Bp1=0.70;                // Flux density for a net mmf

+n1=1150;                 // Speed of shunt motor

+n2=1.25*n1;

+IT=137.84; 

+// Computation of resistance using linear approximation and values are 

+// compared with results obtained in example 11.1

+

+IF=VT/RF;                // Field current

+Ia1=IT-IF;               // Armature current

+Fnet1=Nf*IF;             // Net mmf

+Racir=Ra+RIP+Rs;         // Armature circuit resistance

+Fnet2=Fnet1*(n1/n2)*((VT-Ia1*Racir*1.15)/(VT-Ia1*Racir));

+IF1=Fnet2/Nf;           // Field current

+Rx=(VT/IF1)-RF;         // External resistance required

+

+

+// Display result on command window

+printf("\n The resistance rating of an external resistance = %0.2f Ohm ",Rx);

+