DC

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clc

% Input variables for DC MAchine Torque- Speed Characteristics

V=input(‘Enter the value of DC input voltage in Volts-‘);

Ra=input(‘Enter the value of Armature resistance in ohm-‘);

Ia=input(‘Enter the value of Armature current in Amp-‘);

kt=input(‘Enter the value of torque constant in Nm/A-‘);

ke=input(‘Enter the value of vs/read-‘);

% For derivinf back EMF

Eb=(V-Ia)*Ra;

% For speed variables

N=linspace(0,2000,100);

% Relation between Angular speed(W) and linear speed(N)

W=(2*3.14*N)/60;

% Torque speed relation of DC machine

T=(((kt*V)/Ra)-(ke*kt*W)/Ra);

% Speed vs Torque characteristics curve of DC Machine

plot( N,T,’color’,’g’);

xlabel(‘Speed in RPM’);

ylabel(‘Torque in Nm’);

title(‘Speed vs Torque Characterstic curve’);

axis([0 2000 0 250]);