diff options
Diffstat (limited to '3574/CH10')
24 files changed, 383 insertions, 0 deletions
diff --git a/3574/CH10/EX10.1/EX10_1.png b/3574/CH10/EX10.1/EX10_1.png Binary files differnew file mode 100644 index 000000000..3382725cb --- /dev/null +++ b/3574/CH10/EX10.1/EX10_1.png diff --git a/3574/CH10/EX10.1/EX10_1.sce b/3574/CH10/EX10.1/EX10_1.sce new file mode 100644 index 000000000..b68da3e10 --- /dev/null +++ b/3574/CH10/EX10.1/EX10_1.sce @@ -0,0 +1,26 @@ +// Example 10.1
+// Computation of (a) Induced emf (b) Frequency of the rectangular voltage
+// wave in the armature winding
+// Page No. 394
+
+clc;
+clear;
+close;
+
+// Given data
+E1=136.8; // Generated emf
+P=6; // Number of poles
+n=1180; // Operating speed of machine
+
+// (a) Induced emf
+
+E2=E1*0.75*2;
+
+// (b) Frequency of the rectangular voltage wave in the armature winding
+
+f=P*n*0.75/120;
+
+//Display result on command window
+printf("\n Induced emf = %0.1f V ",E2);
+printf("\n Frequency of the rectangular voltage wave = %0.2f Hz ",f);
+
diff --git a/3574/CH10/EX10.10/EX10_10.png b/3574/CH10/EX10.10/EX10_10.png Binary files differnew file mode 100644 index 000000000..e00828fae --- /dev/null +++ b/3574/CH10/EX10.10/EX10_10.png diff --git a/3574/CH10/EX10.10/EX10_10.sce b/3574/CH10/EX10.10/EX10_10.sce new file mode 100644 index 000000000..0ce9d7c99 --- /dev/null +++ b/3574/CH10/EX10.10/EX10_10.sce @@ -0,0 +1,43 @@ +// Example 10.10
+// Computation of (a) Mechanical power developed (b) Torque developed
+// (c) Shaft torque
+// Page No.427
+
+clc;
+clear;
+close;
+
+// Given data
+T=40; // Hp rating of motor
+Rf=95.3; // Field resistance
+VT=240; // Rated voltade of the machine
+IT=140; // Total current
+Racir=0.0873; // Armature circuit resistance
+n=2500; // Rated speed of the machine
+
+
+// (a) The mechanical power developed
+
+If=VT/Rf; // Field winding current
+Ia1=IT-If; // Armature current
+Ea=VT-Ia1*Racir; // Armature emf
+Pmech=Ea*Ia1; // Mechanical power
+Pmechhp=Ea*Ia1/746;
+
+// (b) Torque developed
+
+TD=7.04*Ea*Ia1/n;
+
+// (c) Shaft torque
+
+Tshaft=T*5252/n;
+
+// Display result on command window
+printf("\n Mechanical power developed= %0.0f W ",Pmech);
+printf("\n Mechanical power developed= %0.1f hp ",Pmechhp);
+printf("\n Torque developed = %0.1f lb-ft ",TD);
+printf("\n Shaft torque = %0.1f lb-ft ",Tshaft);
+
+
+
+
diff --git a/3574/CH10/EX10.11/EX10_11.png b/3574/CH10/EX10.11/EX10_11.png Binary files differnew file mode 100644 index 000000000..6176e9903 --- /dev/null +++ b/3574/CH10/EX10.11/EX10_11.png diff --git a/3574/CH10/EX10.11/EX10_11.sce b/3574/CH10/EX10.11/EX10_11.sce new file mode 100644 index 000000000..ff1d72fb3 --- /dev/null +++ b/3574/CH10/EX10.11/EX10_11.sce @@ -0,0 +1,48 @@ +// Example 10.11
+// Determine (a) Electrical losses (b) Rotational losses (c) Efficiency
+// Page No. 430
+
+clc;
+clear;
+close;
+
+// Given data
+T=124; // Hp rating of motor
+Rf=32.0; // Field resistance
+VT=240; // Rated voltade of the machine
+IT=420; // Total current
+Ra=0.00872; // Armature resistance
+RipRcw=0.0038; // Resistance of interpolar winding and compensating windings
+Pout=92504;
+Vb=2.0; // Rated speed of the machine
+Racir=Ra+RipRcw;
+
+// (a) Electrical losses
+
+If=VT/Rf; // Field current
+Ia=IT-If; // Armature current
+Pf=If^2*Rf; // Field power
+Paipcw=Ia^2*(Ra+RipRcw);
+Pb=Vb*Ia; // Brush loss power
+Plosses=Pf+Paipcw+Pb; // Total power loss
+
+// (b) Rotational losses
+
+Ea=VT-(Ia*Racir)-Vb; // Armature emf
+Pmech=Ea*Ia; // Mechanical power
+Pshaft=T*746; // Shaft power
+Protational=Pmech-Pshaft;
+
+// (c) Ffficiency
+
+eeta=Pout/(VT*IT)*100;
+
+// Display result on command window
+
+printf("\n Electrical losses = %0.1f W ",Plosses);
+printf("\n Rotational losses = %0.0f W ",Protational);
+printf("\n Efficiency = %0.1f Percent ",eeta);
+
+
+
+
diff --git a/3574/CH10/EX10.12/EX10_12.png b/3574/CH10/EX10.12/EX10_12.png Binary files differnew file mode 100644 index 000000000..1cba1864c --- /dev/null +++ b/3574/CH10/EX10.12/EX10_12.png diff --git a/3574/CH10/EX10.12/EX10_12.sce b/3574/CH10/EX10.12/EX10_12.sce new file mode 100644 index 000000000..bc03509fa --- /dev/null +++ b/3574/CH10/EX10.12/EX10_12.sce @@ -0,0 +1,51 @@ +// Example 10.12
+// Determine (a) Rated torque (b) Armature current at locked rotor if no
+// starting resistance is used (c) External resistance required in the armature
+// circuit that would limit the current and develop 200 percent rated torque
+// when starting (d) Assuming the system voltage drops to 215V, determine the
+// locked rotor torque using the external resistor in (c)
+// Page No. 433
+
+clc;
+clear;
+close;
+
+// Given data
+n=1750; // Rotor speed
+P=15; // Hp rating of motor
+VT=230; // Rated voltade of the machine
+Ea=0;
+Racir=0.280; // Armature circuit loss
+Rf=137; // Field resistance
+ItRated=56.2; // Total current drawn
+VT1=215; // Rated voltage after drop
+
+// (a) Rated torque
+Trated=P*5252/n;
+
+// (b) Armature current
+Ia=(VT-Ea)/Racir;
+
+// (c) External resistance required
+If=VT/Rf; // Field current
+IaRated=ItRated-If; // Rated armature current
+
+Ia2=IaRated*2; // Armature current for 200% rated torque
+
+Rx=((VT-Ea)/Ia2)-Racir; // External resistance required
+
+// (d) Locked rotor torque
+If215=VT1/Rf; // Field current at 215V
+Ia215=(VT1-Ea)/(Racir+Rx); // Armature current at 215V
+TD2=Trated*( (If215*Ia215) / (If*IaRated) );
+
+// Display result on command window
+
+printf("\n Rated torque = %0.1f lb-ft ",Trated);
+printf("\n Armature current = %0.1f A ",Ia);
+printf("\n Armature current for 200 percent rated torque = %0.1f A ",Ia2);
+printf("\n External resistance required = %0.2f Ohm ",Rx);
+printf("\n Locked rotor torque = %0.1f lb-ft ",TD2);
+
+
+
diff --git a/3574/CH10/EX10.2/EX10_2.png b/3574/CH10/EX10.2/EX10_2.png Binary files differnew file mode 100644 index 000000000..9fc7b8ee3 --- /dev/null +++ b/3574/CH10/EX10.2/EX10_2.png diff --git a/3574/CH10/EX10.2/EX10_2.sce b/3574/CH10/EX10.2/EX10_2.sce new file mode 100644 index 000000000..e32a71448 --- /dev/null +++ b/3574/CH10/EX10.2/EX10_2.sce @@ -0,0 +1,21 @@ +// Example 10.2
+// Computation of rheostat setting required to obtain an induced emf of 290 V
+// Page No. 399
+
+clc;
+clear;
+close;
+
+// Given data
+Ebat=240; // Induced emf
+If=8.9; // Field current
+Rf=10.4; // Field resistance
+
+// Rheostat setting required to obtain an induced emf of 290 V
+
+Rrheo=(Ebat/If)-Rf;
+
+// Display result on command window
+printf("\n Rheostat setting to obtain an induced emf of 290 V = %0.2f ",Rrheo);
+
+
diff --git a/3574/CH10/EX10.3/EX10_3.png b/3574/CH10/EX10.3/EX10_3.png Binary files differnew file mode 100644 index 000000000..d1549b260 --- /dev/null +++ b/3574/CH10/EX10.3/EX10_3.png diff --git a/3574/CH10/EX10.3/EX10_3.sce b/3574/CH10/EX10.3/EX10_3.sce new file mode 100644 index 000000000..3c175ea87 --- /dev/null +++ b/3574/CH10/EX10.3/EX10_3.sce @@ -0,0 +1,21 @@ +// Example 10.3
+// Computation of no-load voltage if the voltage regulation is 2.3 percent
+// Page No. 401
+
+clc;
+clear;
+close;
+
+// Given data
+Vrated=240; // Rated voltage
+VR=0.023; // Voltage regulation
+
+
+// No-load voltage if the voltage regulation is 2.3 percent
+
+Vnl=Vrated*(1+VR);
+
+// Display result on command window
+printf("\n No-load voltage if the voltage regulation is 2.3 percent = %0.1f V ",Vnl);
+
+
diff --git a/3574/CH10/EX10.4/EX10_4.png b/3574/CH10/EX10.4/EX10_4.png Binary files differnew file mode 100644 index 000000000..3e3a6011a --- /dev/null +++ b/3574/CH10/EX10.4/EX10_4.png diff --git a/3574/CH10/EX10.4/EX10_4.sce b/3574/CH10/EX10.4/EX10_4.sce new file mode 100644 index 000000000..6156c6d4a --- /dev/null +++ b/3574/CH10/EX10.4/EX10_4.sce @@ -0,0 +1,34 @@ +// Example 10.4
+// Computation of percentage reduction in field flux required to obtain a
+// speed of 1650 r/min while drawing an armature current of 50.4 A.
+// Page No. 405
+
+clc;
+clear;
+close;
+
+// Given data
+VT=240; // Induced emf
+R=95.2; // Shunt field resistance
+IT=72; // Total current
+Ra=0.242; // Armature resistance
+Ia2=50.4; // Armature current
+n1=850; // Rated speed of shunt motor
+n2=1650; // Speed of armature winding
+
+
+// Percentage reduction in field flux
+
+If1=VT/R; // Field current
+Ia1=IT-If1; // Armature current
+Ea1=VT-Ia1*Ra; // Armature emf
+Ea2=VT-Ia2*Ra;
+phip2=(n1/n2)*(Ea2/Ea1);
+PerRed=(phip2-1)*100;
+
+
+
+// Display result on command window
+printf("\n Percentage reduction in field flux = %0.1f Percent ",PerRed);
+
+
diff --git a/3574/CH10/EX10.5/EX10_5.png b/3574/CH10/EX10.5/EX10_5.png Binary files differnew file mode 100644 index 000000000..a829ea32b --- /dev/null +++ b/3574/CH10/EX10.5/EX10_5.png diff --git a/3574/CH10/EX10.5/EX10_5.sce b/3574/CH10/EX10.5/EX10_5.sce new file mode 100644 index 000000000..8cb91c4da --- /dev/null +++ b/3574/CH10/EX10.5/EX10_5.sce @@ -0,0 +1,20 @@ +// Example 10.5
+// Computation of no-load speed
+// Page No. 408
+
+clc;
+clear;
+close;
+
+// Given data
+nrated=1750; // Rated speed
+SR=4; // Speed regulation
+
+// No-load speed
+
+Snl=nrated*(1+SR/100);
+
+// Display result on command window
+printf("\n No-load speed = %0.0f r/min ",Snl);
+
+
diff --git a/3574/CH10/EX10.6/EX10_6.png b/3574/CH10/EX10.6/EX10_6.png Binary files differnew file mode 100644 index 000000000..5b8439e7e --- /dev/null +++ b/3574/CH10/EX10.6/EX10_6.png diff --git a/3574/CH10/EX10.6/EX10_6.sce b/3574/CH10/EX10.6/EX10_6.sce new file mode 100644 index 000000000..b51b04226 --- /dev/null +++ b/3574/CH10/EX10.6/EX10_6.sce @@ -0,0 +1,26 @@ +// Example 10.6
+// Computation of Induced emf
+// Page No. 418
+
+clc;
+clear;
+close;
+
+// Given data
+P=25000; // Power of the generator
+VT=250; // Rated voltade of the machine
+Ra=0.1053; // Armature resistance
+Rip=0.0306; // Resistance of interpolar winding
+Rcw=0.0141; // Resistance of compensating windings
+
+
+// Induced emf
+Ia=P/VT; // Armature current
+Racir=Ra+Rip+Rcw; // Resistance of armature circuit
+Ea=VT+Ia*Racir; // Induced emf
+
+
+// Display result on command window
+printf("\n Induced emf = %0.0f V ",Ea);
+
+
diff --git a/3574/CH10/EX10.7/EX10_7.png b/3574/CH10/EX10.7/EX10_7.png Binary files differnew file mode 100644 index 000000000..e3c45d357 --- /dev/null +++ b/3574/CH10/EX10.7/EX10_7.png diff --git a/3574/CH10/EX10.7/EX10_7.sce b/3574/CH10/EX10.7/EX10_7.sce new file mode 100644 index 000000000..4b974ffbf --- /dev/null +++ b/3574/CH10/EX10.7/EX10_7.sce @@ -0,0 +1,26 @@ +// Example 10.7
+// Computation of cemf
+// Page No. 418
+
+clc;
+clear;
+close;
+
+// Given data
+Rf=408.5; // Field resistance
+VT=500; // Rated voltade of the machine
+IT=51.0; // Total current
+Ra=0.602; // Armature resistance
+Ripcw=0.201; // Resistance of interpolar winding and compensating windings
+
+// Induced emf
+If=VT/Rf; // Current
+Ia=IT-If; // Armature current
+Racir=Ra+Ripcw; // Resistance of armature circuit
+Ea=VT-Ia*Racir;
+
+
+// Display result on command window
+printf("\n Induced emf = %0.0f V ",Ea);
+
+
diff --git a/3574/CH10/EX10.8/EX10_8.png b/3574/CH10/EX10.8/EX10_8.png Binary files differnew file mode 100644 index 000000000..2fa664da6 --- /dev/null +++ b/3574/CH10/EX10.8/EX10_8.png diff --git a/3574/CH10/EX10.8/EX10_8.sce b/3574/CH10/EX10.8/EX10_8.sce new file mode 100644 index 000000000..c7887bb64 --- /dev/null +++ b/3574/CH10/EX10.8/EX10_8.sce @@ -0,0 +1,28 @@ +// Example 10.8
+// Computation of new armature current
+// Page No. 420
+
+clc;
+clear;
+close;
+
+// Given data
+Rf=120; // Resistance of inserted resistor
+VT=240; // Rated voltade of the machine
+IT=91; // Total current
+Racir=0.221; // Armature sircuit resistance
+n2=634; // New speed after resistor was inserted
+n1=850; // Rated speed OF THE MACHINE
+Rx=2.14; // Resistance inserted in series witH armature
+
+// New armature current
+
+If=VT/Rf; // Resistor current
+Ia1=IT-If; // Armature current
+Ia2=(VT-(n2/n1)*(VT-Ia1*Racir))/(Racir+Rx);
+
+
+// Display result on command window
+printf("\n New armature current = %0.2f A ",Ia2);
+
+
diff --git a/3574/CH10/EX10.9/EX10_9.png b/3574/CH10/EX10.9/EX10_9.png Binary files differnew file mode 100644 index 000000000..0330aebb8 --- /dev/null +++ b/3574/CH10/EX10.9/EX10_9.png diff --git a/3574/CH10/EX10.9/EX10_9.sce b/3574/CH10/EX10.9/EX10_9.sce new file mode 100644 index 000000000..adc960536 --- /dev/null +++ b/3574/CH10/EX10.9/EX10_9.sce @@ -0,0 +1,39 @@ +// Example 10.9
+// Computation of (a) Steady state armature current if a rheostat in the
+// shunt field circuit reduces flux in air gap to 75% of its rated value
+// (b) Steady state speed for the conditions in (a)
+// Page No. 421
+
+clc;
+clear;
+close;
+
+// Given data
+Rf=160; // Field resistance
+VT=240; // Rated voltade of the machine
+IT=37.5; // Total current
+Ra=0.213; // Armature resistance
+Rip=0.092; // Resistance of interpolar winding
+Rcw=0.065; // Resistance of compensating windings
+n1=2500; // Rated speed of the machine
+
+
+// (a) At rated conditions
+
+If=VT/Rf; // Field current
+Ia1=IT-If; // Armature current
+Ia2=Ia1*0.50*1/0.75;
+
+// (b) steady state speed for the above mentioned conditions
+
+Racir=Ra+Rip+Rcw;
+
+n2=n1*(VT-(Ia2*(1+Racir)))/0.75*(1/(VT-(Ia1*Racir)));
+
+
+// Display result on command window
+
+printf("\n Steady state armature current = %0.1f A ",Ia2);
+printf("\n Steady state speed = %0.0f r/min ",n2);
+
+
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