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+//Book Name: Fundamentals of electrical drives by Mohamad A. El- Sharkawi

+//chapter 7

+//example 7.9

+//edition 1

+//publisher and place:Nelson Engineering

+clc;

+clear;

+V=480;//terminal voltage in volt

+p=6;//number of poles

+f=60;//frequency in hertz

+Xl=3;//inductive reactance in ohm

+Rs=.2;//stator resistance in ohm

+X2=2;//rotor reactance in ohm

+R2=0.1;//resistance reffered to the stator in ohm

+Xm=120;//magnetizing reactance in the linear region in ohm

+Xm1=42;//magnetizing reactance in the saturation region in ohm

+Td=100;//constant load torque in Nm

+n=900;//speed of the motor in rpm

+ns=(120*f)/p;//synchronous speed of the machine in rpm

+s=(ns-n)/ns;//slip of the machine

+//If the machine is in the linear region

+rps=ns/60;

+omegas=(2*%pi*rps);

+Is=sqrt(((Td*s*omegas)*((R2/s)^2+(X2+Xm)^2))/(3*Xm^2*R2));

+costheta=0.7;//assumed power factor value

+I1rated=(Td*omegas)/(sqrt(3)*V*costheta);

+mprintf("\nThe input current if the machine is in the linear region is %f A",I1rated)

+//if the machine is in saturation region

+Is1=sqrt(((Td*s*omegas)*((R2/s)^2+(X2+Xm1)^2))/(3*Xm^2*R2));

+mprintf("\nThe input current if the machine is in the saturation region is %f A",Is1)