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+//Caption:transfer_function_of_motor
+//example 5.9.14
+//page 114
+syms Kt Kb Ra La J 
+//where Ka=amplifier_gain; Kt=motor_torque_const; Ra=armature_resistance; La=armature_inductor; J=moment_of_inertia 
+s=%s;
+//since there are two inputs Va(s)and Tl(s).If Va(s) is held at fixed value then only effect of Tl(s) is considered and Va(s)is taken as Zero.
+a=(Kt*Kb)/(Ra+s*La)
+b=1/J*s
+c=b/(1+b*a);
+disp(-c,"Wm(s)/Tl(s)=");//negative sign indicates that an increase in Tl decreases Wm
+Kb=9.55;Kt=9.55;Ra=0.75;La=0.005;J=50;
+a=(Kt*Kb)/(Ra+s*La)
+b=1/(J)*(1/(s))
+c=b/(1+b*a);
+disp(-c,"Wm(s)/Tl(s)=");//after putting values
+\ No newline at end of file