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+//Book Name: Fundamentals of electrical drives by Mohamad A. El- Sharkawi
+//chapter 7
+//example 7.10
+//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
+Is=21.6;
+rps=n/60;
+omega=(2*%pi*rps);
+f=(((3*Is^(2)*R2)/((2*%pi*Td)/f))+n)*(p/Xm);
+mprintf("\nThe frequency of the CSI to drive the machine at 900 rpm is %f Hz",f)