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+// Example 11.7

+// Computation of the resistance of a dynamic braking resistor that will be 

+// capable of developing 500 lb-ft of braking torque at a speed of 1000 r/min.

+// Page No. 464

+

+clc;

+clear;

+close;

+

+// Given data

+T1=910;                          // Torque load

+Pshaft=199.257*746;              // Power of shaft

+eeta=0.940;                      // Efficiency

+VT=240;                          // Rated voltage

+T2=500;                          // Braking torque

+n1=1000;                         // Windage and friction speed

+n2=1150;                         // Speed of motor

+Rf=52.6;                         // Field resistance

+Racir=0.00707;                   // Combined armature,compensating winding and                                                               // interpolar resistance

+

+// Resistance of a dynamic braking resistor

+Pshaft=T1*n2/5252;             // Shaft power 

+Pin=Pshaft*746/eeta;           // Input power

+IT=Pin/VT;                     // Total current 

+If=VT/Rf;                      // Field current

+Ia1=IT-If;                     // Armature current

+Ea1=VT-Ia1*Racir;              // Armature emf

+

+Ia2=Ia1*T2/T1;                 // Armature current

+Ea2=Ea1*n1/n2;

+RDB=(Ea2-Ia2*Racir)/Ia2;       // Resistance

+

+//Display result on command window

+printf("\n Resistance of the dynamic braking resistor = %0.3f Ohm ",RDB);