initial commit / add all books

9 files changed, 184 insertions, 0 deletions

diff --git a/2276/CH10/EX10.1/chapter10_ex1.sce b/2276/CH10/EX10.1/chapter10_ex1.sce
new file mode 100755
index 000000000..6588f7427
--- /dev/null
+++ b/2276/CH10/EX10.1/chapter10_ex1.sce
@@ -0,0 +1,17 @@
+clc

+clear

+

+//input

+p=4;//number of poles of an alternator

+w=50*%pi;//angular velocity in rad/sec

+b=0.015;//sinusoidal flux per pole in weber

+phi=10*(%pi/180);//pole pitch in radians

+kf=1.11;//form factor

+

+//calculations

+f=(w*(p/2))/(2*%pi);//frequency in hertz

+e=2*kf*b*f;//e.m.f. per conductor in volts

+E=2*e*cos(phi/2);//total e.m.f. in volts

+

+//ouput

+mprintf('the e.m.f. between the ends of the coil is %3.1f V',E)

diff --git a/2276/CH10/EX10.2/chapter10_ex2.sce b/2276/CH10/EX10.2/chapter10_ex2.sce
new file mode 100755
index 000000000..f7f06a6bb
--- /dev/null
+++ b/2276/CH10/EX10.2/chapter10_ex2.sce
@@ -0,0 +1,19 @@
+clc

+clear

+

+//input

+p=4;//number of poles

+n=48;//number of slots

+b=0.02;//fulx per pole in weber 

+w=50*(%pi);//angular velocity in rad/sec

+

+//calcultions

+f=(w*(p/2))/(2*%pi);//frequency in hertz

+phim=360/n;//mechanical angle in degrees

+phie=phim*(p/2);//electrical angle in degrees

+phiE=phie*(%pi/180);//electrical angle in radians

+kd=(sin(2*(phiE/2)))/(2*sin(phiE/2));//distribution factor and 2 is taken as we are calculating for 2 coils

+e=(p/2)*kd*4.44;//total e.m.f. for two coils in series in volts

+

+//output

+mprintf('the total e.m.f. for two coils in series is %3.1f V',e)

diff --git a/2276/CH10/EX10.3/chapter10_ex3.sce b/2276/CH10/EX10.3/chapter10_ex3.sce
new file mode 100755
index 000000000..25a6b18db
--- /dev/null
+++ b/2276/CH10/EX10.3/chapter10_ex3.sce
@@ -0,0 +1,26 @@
+clc

+clear

+

+//input

+p=6;//number of poles

+n=72;//number of slots

+n1=10;//conductors per slot

+b=0.01;//flux per pole in weber

+f=50;//frequency in hertz

+phi=170;//pitch of coil in electrical degrees

+kf=1.11;//form factor for sinusoidal forms

+

+//calcultions

+n2=n/p;//number of slots per pole

+n3=n2/3;//number of slots per pole per phase for 3phase system

+phim=360/n;//mechanical angle between slots in degrees

+phie=phim*(p/2);//electrical angle in degrees

+phiE=phie*(%pi/180);//electrical angle in radians

+kd=(sin(n3*(phiE/2)))/(n3*sin(phiE/2));//distribution factor 

+phis=(180-phi)*(%pi/180);//coil spam factor in radians

+kc=cos(phis);//pitch factor in radians

+e=2*kd*kc*kf*f*b*((n*n1)/3);//e.m.f. per phase in volts

+vl=(3^0.5)*e;//line voltage for star connection in volts

+

+//output

+mprintf('the phase and line voltages are %3.0f V and %3.0f V respectively',e,vl)

diff --git a/2276/CH10/EX10.4/chapter10_ex4.sce b/2276/CH10/EX10.4/chapter10_ex4.sce
new file mode 100755
index 000000000..7a412f786
--- /dev/null
+++ b/2276/CH10/EX10.4/chapter10_ex4.sce
@@ -0,0 +1,17 @@
+clc

+clear

+

+//input

+p=4;//number of poles

+n1=3;//number of phases

+f=50;//frequency in hertz

+inp=60;//input to the motor in kW

+l=0.06;//losses in per units

+

+//calculations

+w=2*%pi*(f/(p/2));//angular velocity in rad/sec

+t=(inp*1000)/w;//total torque produced in newton meter

+tu=t-(t*l);//useful torque in newton meter

+

+//calculations

+mprintf('the total torque and the useful torque of the machine are %3.0f Nm and %3.0f Nm respectively',t,tu)

diff --git a/2276/CH10/EX10.5/chapter10_ex5.sce b/2276/CH10/EX10.5/chapter10_ex5.sce
new file mode 100755
index 000000000..35ecf53a9
--- /dev/null
+++ b/2276/CH10/EX10.5/chapter10_ex5.sce
@@ -0,0 +1,23 @@
+clc

+clear

+

+//input

+p=2;//number of poles

+v=415;//3 phase supply voltage in volts 

+n=3;//number of phases

+x=0.6;//reactance of phase in ohms

+f=50;//supply ferquency in hertz

+e=0.08;//resultant e.m.f. is 0.08of supply voltage

+

+//calculations

+e1=(e*v)/(3^0.5);//resultant e.m.f. per phase in volts

+i=e1/x;//current per phase in current

+il=i;//line current in amperes

+phi=(180/%pi)*atan(e);//load angle in degrees

+the=(180-phi)/p;

+PHI=cos(atan(e));//power factor

+inp=(3^0.5)*v*PHI*il;//power input in watts

+t=inp/(2*%pi*(f/(p/2)));//torque in newton meter

+

+//output

+mprintf('the total torque produced is %3.0f Nm',t)

diff --git a/2276/CH10/EX10.6/chapter10_ex6.sce b/2276/CH10/EX10.6/chapter10_ex6.sce
new file mode 100755
index 000000000..62961164b
--- /dev/null
+++ b/2276/CH10/EX10.6/chapter10_ex6.sce
@@ -0,0 +1,14 @@
+clc

+clear

+

+//input

+n=3;//number of phases

+f=50;//frequency in hertz

+w=96*(%pi);//angular velocity in rad/sec

+

+//calculations

+ws=(2*%pi*f)-w;//slip speed in rad/sec

+s=ws/(2*%pi*f);//slip in per units

+

+//output

+mprintf('the slip speed is %3.2f rad/s and the slip is %3.2f p.u.',ws,s)

diff --git a/2276/CH10/EX10.7/chapter10_ex7.sce b/2276/CH10/EX10.7/chapter10_ex7.sce
new file mode 100755
index 000000000..60a1bd4e0
--- /dev/null
+++ b/2276/CH10/EX10.7/chapter10_ex7.sce
@@ -0,0 +1,17 @@
+clc

+clear

+

+//input

+p=6;//number of poles

+n=3;//number of phases

+f=50;//frequency in hertz

+s=0.03;//slip in per units

+

+//calculations

+w=(2*%pi*f*60)/(n*2*%pi);//synchronous speed in rev/min

+ws=s*w;//slip speed in rev/min

+wr=w-ws;//rotor speed in rev/min

+fs=(ws*n)/60;//frequency of rotor currents in amperes

+

+//output

+mprintf('the rotor speed will be %3.0f rev/min and the frequency of rotor currents will be%3.1f Hz',wr,fs)

diff --git a/2276/CH10/EX10.8/chapter10_ex8.sce b/2276/CH10/EX10.8/chapter10_ex8.sce
new file mode 100755
index 000000000..cf86ca2f1
--- /dev/null
+++ b/2276/CH10/EX10.8/chapter10_ex8.sce
@@ -0,0 +1,25 @@
+clc

+clear

+

+//input

+p=4;//number of poles

+f=50;//supply frequency in hertz

+n=3;//number of phases

+w=1440;//speed in rev/min

+sl=1.5;//stator losses in kW

+fl=1.2;//friction losses in kW

+inp=60;//input to motor in kW

+

+//calculations

+N=(inp*f)/(p/2);//synchronous speed in rev/min

+ns=N-w;//slip speed in rev/min

+s=ns/N;//slip in per units

+rinp=inp-sl;//rotor input in kW

+rc=s*rinp;//rotor copper losses in kW

+tr=(rinp*1000)/((N*2*%pi)/60);//rotor torque in newton meter

+rout=rinp-rc;//rotor output in kW

+mout=rout-fl;//motor output in kW

+eff=mout/inp;//efficiency of rotor in per unit

+

+//output

+mprintf('the slip is %3.2f p.u.:the rotor copper loss is %3.2f kW: the total torque is %3.0f Nm and the efficiency is %3.3f p.u.',s,rc,tr,eff)

diff --git a/2276/CH10/EX10.9/chapter10_ex9.sce b/2276/CH10/EX10.9/chapter10_ex9.sce
new file mode 100755
index 000000000..06128ade8
--- /dev/null
+++ b/2276/CH10/EX10.9/chapter10_ex9.sce
@@ -0,0 +1,26 @@
+clc

+clear

+

+//input

+p=6;//number of poles

+f=50;//frequency in hertz

+n=3;//number of phases

+t=160;//total torque in newton meter

+fs=120;//slip frequency in cycles/min

+tf=12;//torque lost in friction

+sl=750;//stator losses in watts

+

+//calculations

+s=fs/(60*f);//slip in per unit

+w=(2*%pi*f)/n;//speed of motor in rad/sec

+wr=w*(1-s);//rotor speed in rad/sec

+rinp=t*w;//rotor input in watts

+rc=s*rinp;//rotor copper losses in watts

+sinp=rinp+sl;//stator input in watts

+Sinp=sinp/1000;//stator input in kilowatts

+tout=t-tf;//output torque in newton meter

+pout=tout*wr;//power output in watts

+eff=pout/sinp;//efficiency in per unit

+

+//output

+mprintf('the rotor loss is %3.0fW, the input to the motor is %3.2f kW and the motor efficiency is %3.2f p.u.',rc,Sinp,eff)