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// ELECTRICAL MACHINES
// R.K.Srivastava
// First Impression 2011
// CENGAGE LEARNING INDIA PVT. LTD
// CHAPTER : 7 : SPECIAL MOTORS AND INTRODUCTION TO GENERALIZED MACHINE THEORY
// EXAMPLE : 7.5
clear ; clc ; close ; // Clear the work space and console
// GIVEN DATA
R = 15; // Resistance of the fractional horse power AC series motor in Ohms
V = 230; // AC supply voltage in Volts
f = 50; // Frequency in Hertz
I = 1.2; // Motor current in Amphere
NDC = 2500; // Rotating speed of the Motor during DC Operation in RPM
L = 0.5; // Total inductance in Henry
// CALCUALTIONS
X = 2*%pi*f*L; // Reactance in Ohms
NAC = NDC * (sqrt(V^2-(I*X)^2)-(I*R)) / (V-(I*R)); // Rotating speed of the Motor during AC Operation in RPM
pf = sqrt(1-((I*X)/V)^2); // Power factor lagging
// DISPLAY RESULTS
disp("EXAMPLE : 7.5: SOLUTION :-");
printf("\n When the Motor operting at AC 230V, 50 Hz \n\n (a) NAC = %.f RPM \n",NAC)
printf("\n (b) Power factor = %.4f lagging \n",pf)
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