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+//Book Name: Fundamentals of electrical drives by Mohamad A. El- Sharkawi
+//chapter 11
+//example 11.3
+//edition 1
+//publishing place:Thomson Learning
+clc;
+clear;
+Ra=2;//armature resistance in ohm
+Tst1=2;//limited starting time in sec
+Kphi=3;//field constant in V sec
+Jm=1;//motor moment of inertia in Nm
+Jl=5;//load moment of inertia in Nm
+tau=((Jl+Jm)*Ra)/Kphi^(2);
+Tst=3*tau;//starting time of the motor based on given data in sec
+Jeq=(Tst1*(Kphi^(2)))/(3*Ra);
+gr=sqrt((Jeq-Jm)/Jl);//gear ratio n1/n2
+mprintf("To achieve the desired starting current the gear ratio n1/n2 must be between %f",gr)