initial commit / add all books

7 files changed, 155 insertions, 0 deletions

diff --git a/1541/CH3/EX3.1/Chapter3_Example1.sce b/1541/CH3/EX3.1/Chapter3_Example1.sce
new file mode 100755
index 000000000..1c809f3ab
--- /dev/null
+++ b/1541/CH3/EX3.1/Chapter3_Example1.sce
@@ -0,0 +1,19 @@
+//Chapter-3, Example 3.1, Page 3.6

+//=============================================================================

+clc

+clear

+

+//INPUT DATA

+N=900;//Rotor speed in rpm

+f=50;//Power supply frequency in Hz

+P=6;//No. of poles

+

+//CALCULATIONS

+Ns=(120*f)/P;//Synchronous speed in rpm

+s=((Ns-N)/Ns)*100;//%slip 

+f1=(s*f)/100;//Frequency of rotor current in Hz

+

+//OUTPUT

+mprintf('Slip of a 3 phase motor is %i percent\nFrequency of rotor current is %i Hz',s,f1)

+

+//=================================END OF PROGRAM==============================

diff --git a/1541/CH3/EX3.2/Chapter3_Example2.sce b/1541/CH3/EX3.2/Chapter3_Example2.sce
new file mode 100755
index 000000000..77911e96d
--- /dev/null
+++ b/1541/CH3/EX3.2/Chapter3_Example2.sce
@@ -0,0 +1,20 @@
+//Chapter-3, Example 3.2, Page 3.6

+//=============================================================================

+clc

+clear

+

+//INPUT DATA

+N=600;//Speed of 12 pole 3 phase alternator in rpm

+P=12;//No. of poles of alternator

+n=6;//No. of poles in induction motor

+s=2.5;//slip of the motor in %

+

+//CALCULATIONS

+f=(N*P)/120;//Alternator supply frequency in Hz

+Ns=(120*f)/n;//Synchronous speed in rpm

+N1=(Ns-((s*Ns)/100));//Full load speed of the motor when the slip is 2.5%

+

+//OUTPUT

+mprintf('Full load speed of the motor when the slip is 2.5 percent = %irpm',N1)

+

+//=================================END OF PROGRAM==============================

diff --git a/1541/CH3/EX3.3/Chapter3_Example3.sce b/1541/CH3/EX3.3/Chapter3_Example3.sce
new file mode 100755
index 000000000..c2e748c18
--- /dev/null
+++ b/1541/CH3/EX3.3/Chapter3_Example3.sce
@@ -0,0 +1,19 @@
+//Chapter-3, Example 3.3, Page 3.7

+//=============================================================================

+clc

+clear

+

+//INPUT DATA

+P=6;//Number of poles

+f=50;//Supply frequency in Hz

+f1=3;//Rotor current frequency in Hz

+

+//CALCULATIONS

+s=(f1/f)*100;//Slip of the motor in %

+Ns=(120*f)/P;//Synchronous speed in rpm

+N=(Ns-((s*Ns)/100));//Speed of the motor in rpm

+

+//OUTPUT

+mprintf('Slip of the motor is %i percent\nSpeed of the motor is %i rpm',s,N)

+

+//=================================END OF PROGRAM==============================

diff --git a/1541/CH3/EX3.4/Chapter3_Example4.sce b/1541/CH3/EX3.4/Chapter3_Example4.sce
new file mode 100755
index 000000000..57fe813ca
--- /dev/null
+++ b/1541/CH3/EX3.4/Chapter3_Example4.sce
@@ -0,0 +1,23 @@
+//Chapter-3, Example 3.4, Page 3.12

+//=============================================================================

+clc

+clear

+

+//INPUT DATA

+VL=440;//Supply line voltage in V

+P=4;//Number of poles

+IL=75;//Line current in A

+cosx=0.8;//Power factor

+n=0.8;//Efficiency of the motor

+s=0.03;//slip of the motor

+f=50;//Frequency in Hz

+

+//CALCULATIONS

+Pm=(sqrt(3)*VL*IL*cosx*n);//Output power in W

+Ns=(120*f)/P;//Synchronous speed in rpm

+N=(1-s)*Ns;//Actual speed in rpm

+

+//OUTPUT

+mprintf('Shaft output power is %3.0f W\nActual speed is %i rpm',Pm,N)

+

+//=================================END OF PROGRAM==============================

diff --git a/1541/CH3/EX3.5/Chapter3_Example5.sce b/1541/CH3/EX3.5/Chapter3_Example5.sce
new file mode 100755
index 000000000..b3efb18d6
--- /dev/null
+++ b/1541/CH3/EX3.5/Chapter3_Example5.sce
@@ -0,0 +1,27 @@
+//Chapter-3, Example 3.5, Page 3.13

+//=============================================================================

+clc

+clear

+

+//INPUT DATA

+P=6;//Number of poles

+f=50;//Supply frequency in Hz

+Tm=120;//Shaft torque in N.m

+f1=2;//Rotor current frequency in Hz

+L=5;//Amount of constant losses in N.m

+C=500;//Amount of core losses in W

+

+//CALCULATIONS

+Ns=(120*f)/P;//Synchronous speed in rpm

+s=(f1/f);//Slip of the motor 

+N=(1-s)*Ns;//Actual speed in rpm

+P=(2*3.14*N*Tm)/60;//Shaft power in W

+Pm=(2*3.14*N*(Tm+L))/60000;//Mechanical power output in kW

+R=(s*Pm)/(1-s);//Rotor copper losses in kW

+I=(Pm+R+(L/10));//Motor input in kW

+n=(Pm/I)*100;//Machine efficiency

+

+//OUTPUT

+mprintf('a)Mechanical power output is %3.3f kW\nb)Rotor copper losses is %3.2fkW\nc)Motor input is %3.3f kW\nd)Machine efficiency is %3.1f percent',Pm,R,I,n)

+

+//=================================END OF PROGRAM==============================

diff --git a/1541/CH3/EX3.6/Chapter3_Example6.sce b/1541/CH3/EX3.6/Chapter3_Example6.sce
new file mode 100755
index 000000000..2c49988a2
--- /dev/null
+++ b/1541/CH3/EX3.6/Chapter3_Example6.sce
@@ -0,0 +1,24 @@
+//Chapter-3, Example 3.6, Page 3.17

+//=============================================================================

+clc

+clear

+

+//INPUT DATA

+VL=11000;//Supply line voltage in V

+P=12;//Number of poles

+f=50;//Supply frequency in Hz

+R2=0.2;//Rotor resistance in ohm

+X2=1.2;//Rotor reactance at stand still in ohm

+N=480;//Full load speed in rpm

+

+//CALCULATIONS

+s=(R2/X2);//Slip at maximum torque

+Ns=(120*f)/P;//Synchronous speed in rpm

+s1=(Ns-N)/Ns;//Slip at full load

+T=((R2^2+(s1^2*X2^2))/((2*X2)*(s1*R2)));//Ratio of maximum and full load torque

+T1=((R2^2+X2^2)/(2*X2*R2));//Ratio of maximum and starting torque

+

+//OUTPUT

+mprintf('a)Slip at maximum torque is %3.2f \nb)Ratio of maximum and full load torque is %3.2f \nc)Ratio of maximum and starting torque is %3.2f',s,T,T1)

+

+//=================================END OF PROGRAM==============================

diff --git a/1541/CH3/EX3.7/Chapter3_Example7.sce b/1541/CH3/EX3.7/Chapter3_Example7.sce
new file mode 100755
index 000000000..cc5cf208a
--- /dev/null
+++ b/1541/CH3/EX3.7/Chapter3_Example7.sce
@@ -0,0 +1,23 @@
+//Chapter-3, Example 3.7, Page 3.18

+//=============================================================================

+clc

+clear

+

+//INPUT DATA

+P=6;//Number of poles

+f=50;//Supply frequency in Hz

+R2=0.4;//Rotor reisitance in ohm

+X2=4;//Rotor standstill reactance in ohm

+T1=2;//Ratio of maximum torque to starting torque

+

+//CALCULATIONS

+Ns=(120*f)/P;//Synchronous speed in rpm

+Sm=(R2/X2);//Slip at maximum torque

+NTM=(Ns*(1-Sm));//Speed of the motor at maximum torque in rpm

+T=((R2^2+X2^2)/(2*R2*X2));//Ratio of maximum torque to starting torque

+Rext=(sqrt(X2^2/((2*T1)-1))-R2);//Additional resistance required for the ratio of maximum torque to the statring torque to be 2 in ohm

+

+//OUTPUT

+mprintf('a)Speed of the motor at maximum torque is %i rpm \n b)Ratio of maximum torque to starting torque is %3.2f \n c)Additional resistance required for the ratio of maximum torque to the starting torque to be 2 is %3.1f ohm',NTM,T,Rext)

+

+//=================================END OF PROGRAM==============================