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-rw-r--r--3760/CH7/EX7.1/Ex7_1.sce14
-rw-r--r--3760/CH7/EX7.10/Ex7_10.sce8
-rw-r--r--3760/CH7/EX7.11/Ex7_11.sce18
-rw-r--r--3760/CH7/EX7.12/Ex7_12.sce19
-rw-r--r--3760/CH7/EX7.13/Ex7_13.sce22
-rw-r--r--3760/CH7/EX7.15/Ex7_15.sce9
-rw-r--r--3760/CH7/EX7.2/Ex7_2.sce20
-rw-r--r--3760/CH7/EX7.3/Ex7_3.sce19
-rw-r--r--3760/CH7/EX7.5/Ex7_5.sce30
-rw-r--r--3760/CH7/EX7.6/Ex7_6.sce19
-rw-r--r--3760/CH7/EX7.7/Ex7_7.sce20
-rw-r--r--3760/CH7/EX7.8/Ex7_8.sce28
-rw-r--r--3760/CH7/EX7.9/Ex7_9.sce9
13 files changed, 235 insertions, 0 deletions
diff --git a/3760/CH7/EX7.1/Ex7_1.sce b/3760/CH7/EX7.1/Ex7_1.sce
new file mode 100644
index 000000000..c592868ab
--- /dev/null
+++ b/3760/CH7/EX7.1/Ex7_1.sce
@@ -0,0 +1,14 @@
+clc;
+p=6; // number of poles
+c=40; // number of coils
+w=2; // winding pitch for simplex lap winding
+printf('Number of commutator segments is equal to number of coils=%f\n ',c);
+k=1/3; // integer added(or subtracted) to calculate back pitch to make it an odd integer
+yb=((2*c)/p)-k;
+printf('Back pitch is %f \n',yb);
+yf=yb-w;
+printf('Front pitch for progressive winding is %f\n',yf);
+yf=yb+w;
+printf('Front pitch for retrogressive winding is %f\n',yf)
+yc=1;
+printf('For simplex lap winding, commutator pitch is equal to %f ',yc);
diff --git a/3760/CH7/EX7.10/Ex7_10.sce b/3760/CH7/EX7.10/Ex7_10.sce
new file mode 100644
index 000000000..4aca2e29d
--- /dev/null
+++ b/3760/CH7/EX7.10/Ex7_10.sce
@@ -0,0 +1,8 @@
+clc;
+disp('b(1)');
+c=12; // number of coils
+r=0.1; // resistance of each coil
+// any one coil connected to commutator segment is in parallel with other 11 series connected coils therefore
+R=11*r; // resistance of 11 coil
+req=(r*R)/(r+R);
+printf('Resistance measured between two adjacent commutator segments is %f ohm\n',req);
diff --git a/3760/CH7/EX7.11/Ex7_11.sce b/3760/CH7/EX7.11/Ex7_11.sce
new file mode 100644
index 000000000..d36744414
--- /dev/null
+++ b/3760/CH7/EX7.11/Ex7_11.sce
@@ -0,0 +1,18 @@
+clc;
+disp('a');
+s=24; // total number of slots
+p=4; // number of poles
+np=3; // number of phases
+ph=60; // phase spread
+// given armature has double layer winding and full pitch coil span
+v=(p*180)/s;
+printf('Slot angular pitch is %d degrees\n',v);
+disp('Number of adjacent slots in one phase belt is');
+disp(ph/v);
+cs=s/p;
+printf('Coil span is %d slots\n',cs);
+disp('Using this data winding table for the three phases is shown in Ex7.11')
+disp('d');
+sp=s/(p*np); // slots per pole per phase
+disp('Distribution factor is');
+disp(sind(ph/2)/(sp*sind(v/2)));
diff --git a/3760/CH7/EX7.12/Ex7_12.sce b/3760/CH7/EX7.12/Ex7_12.sce
new file mode 100644
index 000000000..952e75c57
--- /dev/null
+++ b/3760/CH7/EX7.12/Ex7_12.sce
@@ -0,0 +1,19 @@
+clc;
+disp('a');
+s=24; // total number of slots
+p=4; // number of poles
+np=3; // number of phases
+ph=120; // phase spread
+// given armature has double layer winding and full pitch coil span
+v=(p*180)/s;
+printf('Slot angular pitch is %d degrees\n',v);
+disp('Number of adjacent slots in one phase belt is');
+disp(ph/v);
+cs=s/p;
+printf('Coil span is %d slots\n',cs);
+disp('Using this data winding table for the three phases is shown in Ex7.12')
+disp('d');
+sp=s/(p*np); // slots per pole per phase
+disp('Distribution factor is');
+disp(sind(ph/2)/(sp*sind(ph/(2*sp))));
+
diff --git a/3760/CH7/EX7.13/Ex7_13.sce b/3760/CH7/EX7.13/Ex7_13.sce
new file mode 100644
index 000000000..cf76204a3
--- /dev/null
+++ b/3760/CH7/EX7.13/Ex7_13.sce
@@ -0,0 +1,22 @@
+clc;
+np=3; // number of phase
+sp=9; // slots per pole
+zs=4; // conductors per slot
+f=0.8; // coil span as a fraction of pole pitch
+ph=60; // phase spread
+v=180/sp; // slot angular pitch
+disp('Number of adjacent slots belonging to any phase is ');
+disp(ph/v);
+printf('Pole pitch is %f slots\n',sp);
+c=floor(0.8*sp);
+printf('Coil span is of %f slots\n',c);
+disp('Using this data, winding table is shown in Ex7.13');
+t=(sp*zs*4)/2; // total turns in machine
+spp=sp/np; // slots per pole per phase
+kd=sind(ph/2)/(spp*sind(v/2)); // distribution factor
+cp=c*v; // coil span in degrees
+e=180-cp; // chording angle
+kp=cosd(e/2); // coil span factor
+kw=kd*kp; // winding factor
+tp=(t*kw)/np;
+printf('Number of effective turns per phase is %f',tp);
diff --git a/3760/CH7/EX7.15/Ex7_15.sce b/3760/CH7/EX7.15/Ex7_15.sce
new file mode 100644
index 000000000..ad69787dc
--- /dev/null
+++ b/3760/CH7/EX7.15/Ex7_15.sce
@@ -0,0 +1,9 @@
+clc;
+s=24; // number of slots
+p=4; // number of poles
+ph=60; // phase spread
+ap=(p*180)/s; // slot angular pitch
+pp=s/p; // pole pitch
+printf('Pole pitch is %d slots\n',pp);
+printf('slot angular pitch is %d degrees',ap);
+disp('using these data, half coil and whole coil single layer concentric windings diagram are drawn');
diff --git a/3760/CH7/EX7.2/Ex7_2.sce b/3760/CH7/EX7.2/Ex7_2.sce
new file mode 100644
index 000000000..a1458d2ca
--- /dev/null
+++ b/3760/CH7/EX7.2/Ex7_2.sce
@@ -0,0 +1,20 @@
+clc;
+p=4; // number of poles
+c=12; // number of coils
+// Number of commutator segments is equal to number of coils=12
+// Each coil has two coil side therefore total coil sides are 24
+s=(2*c)/2 ; // total number of slots required
+k=1; // integer added(or subtracted) to calculate back pitch to make it an odd integer
+w=2; // winding pitch
+yb1=((2*c)/p)-k; // back pitch
+// or
+yb2=((2*c)/p)+k; // back pitch
+disp('Back pitch is ');
+disp(yb1,'or',yb2);
+yf1=yb1-2; // front pitch for yb=5
+yf2=yb2-2; // front pitch for yb=7
+disp('front pitch for progressive winding is ');
+disp(yf1,'or',yf2);
+disp('It is desirable that (yb+yf)/2 should be equal to pole pitch that is 6(in terms of coil sides per pole). So choose yb=7 and yf=5');
+disp('Commutator pitch for progressive lap winding is');
+disp(1);
diff --git a/3760/CH7/EX7.3/Ex7_3.sce b/3760/CH7/EX7.3/Ex7_3.sce
new file mode 100644
index 000000000..36d579d0f
--- /dev/null
+++ b/3760/CH7/EX7.3/Ex7_3.sce
@@ -0,0 +1,19 @@
+clc;
+p=4; // number of poles
+s=14; // number of slots
+cp=2; // coil sides per slots
+w=2; // winding pitch
+C=(s*cp)/2; // number of coils
+yb=(2*C)/p;
+disp('Back pitch is');
+disp(yb);
+yf=yb-w;
+disp('Front pitch is');
+disp(yf);
+disp('winding table for progressive lap winding is');
+disp('(1-8)-(3-10)-(5-12)-(7-14)-(9-16)-(11-18)-(13-20)-(15-22)-(17-24)-(19-26)');
+disp('-(21-28)-(23-2)-(25-4)-(27-6)');
+disp('from winding diagram')
+disp('Brush A is touching segments 1 and 2 partly');
+disp('Brush B is at segment 5');
+disp('Brush C is at segment 8');
diff --git a/3760/CH7/EX7.5/Ex7_5.sce b/3760/CH7/EX7.5/Ex7_5.sce
new file mode 100644
index 000000000..e8b631ff3
--- /dev/null
+++ b/3760/CH7/EX7.5/Ex7_5.sce
@@ -0,0 +1,30 @@
+clc;
+disp('case a');
+s=30; // number of slots
+c=60; // number of coils
+p=4; // number of poles
+k=1; // integer added(or subtracted) to calculate back pitch to make it an odd integer
+tc=c*2; // total coil sides
+u=tc/s; // coil sides per slots
+yb1=(tc/p)+k;
+yb2=(tc/p)-k;
+disp('Back pitch is');
+disp(yb1);
+disp('or');
+disp(yb2);
+disp('for back pitch=29, top coil sides 1 and 3 in slot 1 are connected to bottom coil 30 and 32 in slot 8. Due to this arrangement split coils can be avoided. But for back pitch= 31, coil sides 34 which is in slot 9 has to be used, so split coils are needed ')
+disp('case b');
+s=20; // number of slots
+c=60; // number of coils
+p=4; // number of poles
+k=1; // integer added(or subtracted) to calculate back pitch to make it an odd integer
+tc=c*2; // total coil sides
+u=tc/s; // coil sides per slots
+yb1=(tc/p)+k;
+yb2=(tc/p)-k;
+disp('Back pitch is');
+disp(yb1);
+disp('or');
+disp(yb2);
+disp('for back pitch=29, top coil sides 1,3 and 5 are connected to bottom coil 30, 32 and 34. Due to this arrangement split coils cannot be avoided. But for back pitch= 31, coil sides 1,3 and 5 are connected to bottom coil sides 32, 34 and 36 which are in slot 6,so split coils are not needed ');
+
diff --git a/3760/CH7/EX7.6/Ex7_6.sce b/3760/CH7/EX7.6/Ex7_6.sce
new file mode 100644
index 000000000..ad8ff7729
--- /dev/null
+++ b/3760/CH7/EX7.6/Ex7_6.sce
@@ -0,0 +1,19 @@
+clc;
+p=4; // number of poles
+s=11; // number of slots
+ts=2; // coil sides per slot
+C=(s*ts)/2; // total coils
+w=((2*C)+2)/(p/2); // winding pitch
+// since both back and front pitch should be odd choose
+Yb=7;
+Yf=5;
+disp('Back pitch is')
+disp(Yb);
+disp('Front pitch is')
+disp(Yf);
+yc=(C+1)/(p/2);
+disp('commutator pitch');
+disp(yc);
+disp('Using this data winding diagram can be drawn');
+disp('Winding table is');
+disp('(1-8)-(13-20)-(3-10)-(15-22)-(5-12)-(17-2)-(7-14)-(19-4)-(9-16)-(21-6)-(11-18)-1');
diff --git a/3760/CH7/EX7.7/Ex7_7.sce b/3760/CH7/EX7.7/Ex7_7.sce
new file mode 100644
index 000000000..14c54e7fc
--- /dev/null
+++ b/3760/CH7/EX7.7/Ex7_7.sce
@@ -0,0 +1,20 @@
+clc;
+p=6; // number of poles
+s=72; // number of slots
+ts=4; // number of coil sides per slot
+C=(s*ts)/2; // total number of coils
+// To make commutator pitch an integer one coil is made dummy coil therefore
+C=C-1;
+yc=(C+1)/(p/2);
+disp('commutator pitch');
+disp(yc);
+yw=((2*C)+2)/(p/2);
+disp('Winding pitch is');
+disp(yw);
+// since back and front pitch should be odd choose
+yb=49;
+disp('Back pitch is');
+disp(yb);
+yf=47;
+disp('Front pitch is');
+disp(yf);
diff --git a/3760/CH7/EX7.8/Ex7_8.sce b/3760/CH7/EX7.8/Ex7_8.sce
new file mode 100644
index 000000000..744df0e7e
--- /dev/null
+++ b/3760/CH7/EX7.8/Ex7_8.sce
@@ -0,0 +1,28 @@
+clc;
+p=4; // number of poles
+z=2540; // number of conductors
+s=32; // number of slots
+c=127; // number of commutator sectors=total number of coils
+v=500; // induced voltage required
+f=5*10^-3; // field flux per pole
+a=2; // number of parallel paths
+zs=ceil(z/s); // conductors per slot
+// for zs=80
+Z=zs*s; // total conductors
+t=floor(Z/(2*c)); // turn per coil
+C=Z/(2*t); // actual number of coils
+// It is necessary that actual coils should be same as commutator segments so one coil is made dummy
+disp('commutor pitch is')
+disp((c+1)/(p/2));
+disp('or');
+disp((c-1)/(p/2));
+disp('Winding pitch is')
+disp(((2*c)+2)/(p/2));
+disp('or');
+disp(((2*c)-2)/(p/2));
+disp('For progressive winding, back pitch=65 and front pitch=63');
+disp('For retrogressive winding, back pitch=63 and front pitch=63');
+// since dumy coil is not in circuit, number of active conductor is
+Z=c*t*2;
+n=(v*a*60)/(f*Z*p);
+printf('Speed for required induced voltage is %f rpm',n);
diff --git a/3760/CH7/EX7.9/Ex7_9.sce b/3760/CH7/EX7.9/Ex7_9.sce
new file mode 100644
index 000000000..e580e99b3
--- /dev/null
+++ b/3760/CH7/EX7.9/Ex7_9.sce
@@ -0,0 +1,9 @@
+clc;
+p=8; // number of poles
+c=240; // number of coils
+r=10; // number of equilizer ring
+Yeq=(2*c)/p;
+printf('Equipotential pitch is %f coils\n',Yeq);
+Ytp=(2*c)/(r*p);
+printf('Tapping point pitch is %f coils',Ytp);
+disp('Arrangement is shown in tabular form in example 7.9');
generated by cgit (git 2.34.1) at 2024-12-19 12:46:20 +0000