initial commit / add all books

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+clc

+//variable Initialisation

+V=415//Voltage Input in Volts

+f=50//supply frequency in Hz

+P=4//No of Poles

+N1=1450//Rotor Speed in rpm

+N2=1290//Rotor Speed in rpm for case II

+R1=1.01

+R2=0.69

+X1=1.08

+X2=1.60

+Xm=36

+Tl=42//Rated torque in N-m

+//Solution

+Vph=V/sqrt(3)

+Ns=120*f/P

+Ws=2*%pi*Ns/60

+Wm=2*%pi*N1/60

+K=Tl/(Wm^2)

+s=(Ns-N2)/Ns//Slip

+Wm2=Ws*(1-s)

+Tl=K*(Wm2^2)//Load Torque in N-m

+Tl2=Tl*Wm2//Torque in Synchronous Watts

+I2=sqrt((Tl2*s)/(3*R2*(1-s)))

+Z=R1+(R2/s)+(%i*(X1+X2))//Impedance at slip s

+V2=I2*abs(Z)//Voltage applied in Volts/Phase

+Im=V2/(%i*Xm)

+Im1=abs(Im)

+Ir=V2/Z//Rotor Current

+Is=Ir+Im//Stator Current

+a=atand(imag(Is)/real(Is))

+Pin=3*V2*abs(Is)*cosd(a)//Input Power

+Smax=1/3//Smax is obtain theorotically

+I2max=Ws*sqrt(Smax)*(1-Smax)*sqrt(K*Ws/(3*R2))

+Nr=Ns*(1-Smax)//Speed at maximum Current

+Wmax=2*%pi*Nr/60

+T=3*(I2max^2)*R2*(1-Smax)/(Smax*Wmax)//Torque at maximum Current

+printf('\n\n The Load torque=%0.1f N-m\n\n',Tl)

+printf('\n\n The Rotor Current=%0.1f Amp\n\n',Ir)

+printf('\n\n The Stator Supply Voltage=%0.1f Volts\n\n',V2)

+printf('\n\n The Motor input current=%0.1f Amp\n\n',Is)

+printf('\n\n The Motor input power=%0.1f Watt\n\n',Pin)//The answer provided in the textbook is wrong

+printf('\n\n Maximum rotor Current=%0.1f Amp\n\n',I2max)

+printf('\n\n The speed at maximum current=%0.1f rad/sec\n\n',Wmax)

+printf('\n\n The torque at maximum current=%0.1f N-m\n\n',T)