diff options
| author | prashantsinalkar | 2017-10-10 12:27:19 +0530 |
|---|---|---|
| committer | prashantsinalkar | 2017-10-10 12:27:19 +0530 |
| commit | 7f60ea012dd2524dae921a2a35adbf7ef21f2bb6 (patch) | |
| tree | dbb9e3ddb5fc829e7c5c7e6be99b2c4ba356132c /3574/CH6/EX6.2 | |
| parent | b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b (diff) | |
| download | Scilab-TBC-Uploads-7f60ea012dd2524dae921a2a35adbf7ef21f2bb6.tar.gz Scilab-TBC-Uploads-7f60ea012dd2524dae921a2a35adbf7ef21f2bb6.tar.bz2 Scilab-TBC-Uploads-7f60ea012dd2524dae921a2a35adbf7ef21f2bb6.zip | |
initial commit / add all books
Diffstat (limited to '3574/CH6/EX6.2')
| -rw-r--r-- | 3574/CH6/EX6.2/EX6_2.png | bin | 0 -> 136097 bytes | |||
| -rw-r--r-- | 3574/CH6/EX6.2/EX6_2.sce | 67 |
2 files changed, 67 insertions, 0 deletions
diff --git a/3574/CH6/EX6.2/EX6_2.png b/3574/CH6/EX6.2/EX6_2.png Binary files differnew file mode 100644 index 000000000..04bb6e898 --- /dev/null +++ b/3574/CH6/EX6.2/EX6_2.png diff --git a/3574/CH6/EX6.2/EX6_2.sce b/3574/CH6/EX6.2/EX6_2.sce new file mode 100644 index 000000000..fc80a231f --- /dev/null +++ b/3574/CH6/EX6.2/EX6_2.sce @@ -0,0 +1,67 @@ +// Example 6.2
+// Determine (a) Capacitance required in series with the auxillary winding
+// in order to obtain a 90 degree phase displacement between the current in
+// the main winding and the current in the auxillary winding at locked rotor
+// (b) Locked rotor torque in terms of the machine constant
+// Page No. 265
+
+clc;
+clear;
+close;
+
+// Given data
+Zmw=2.00+%i*3.50 // Main winding impedance
+Zaw=9.15+%i*8.40 // Auxillary winding impedance
+VT=120; // Transformer voltage
+Xaw=8.40; // Auxillary winding reactance
+Raw=9.15; // Auxillary winding resistance
+f=60; // Frequency
+Tlr=107.1; // Original torque
+
+// (a) Capacitance required in series with the auxillary winding
+// Main winding impedance in polar form
+// Complex to Polar form...
+Zmw_Mag=sqrt(real(Zmw)^2+imag(Zmw)^2); // Magnitude part
+Zmw_Ang=atan(imag(Zmw),real(Zmw))*180/%pi; // Angle part
+
+// Auxillary winding impedance in polar form
+// Complex to Polar form...
+Zaw_Mag=sqrt(real(Zaw)^2+imag(Zaw)^2); // Magnitude part
+Zaw_Ang=atan(imag(Zaw),real(Zaw))*180/%pi; // Angle part
+
+// Main winding current
+Imw_Mag=VT/Zmw_Mag; // Main winding current magnitude
+Imw_Ang=0-Zmw_Ang; // Main winding current angle
+
+// Auxillary winding current
+Iaw_Mag=VT/Zaw_Mag; // Auxillary winding current magnitude
+Iaw_Ang=0-Zaw_Ang; // Auxillary winding current angle
+
+Theta_awi=90-60.26; // Required phase angle
+Theta_awz=-Theta_awi;
+
+Xc=Xaw-Raw*tand(Theta_awz); // Capacitive reactance
+
+C=1/2*%pi*f*Xc; // Required capacitance
+
+
+// (b) Locked rotor torque in terms of the machine constant
+Zawnew=Raw+%i*Xaw-%i*Xc; // Auxillary winding impedance
+// Complex to Polar form...
+Zawnew_Mag=sqrt(real(Zawnew)^2+imag(Zawnew)^2); // Magnitude part
+Zawnew_Ang=atan(imag(Zawnew),real(Zawnew))*180/%pi; // Angle part
+
+Iawnew_Mag=VT/Zawnew_Mag; // Auxillary winding current magnitude
+Iawnew_Ang=0-Zawnew_Ang; // Auxillary winding current magnitude
+
+Tlenew=Imw_Mag*Iawnew_Mag*sind(90);
+
+// Percent change increase in locked rotor torque
+PI=(Tlenew-Tlr)/Tlr*100;
+
+
+// Display result on command window
+printf("\n Required capacitance = %0.1f microF ",C);
+printf("\n Percent increase in locked rotor torque = %0.0f Percent",PI);
+
+//Note: Capacitor computation is wrong in the book
|
