initial commit / add all books

1 files changed, 53 insertions, 0 deletions

diff --git a/1092/CH9/EX9.19/Example9_19.sce b/1092/CH9/EX9.19/Example9_19.sce
new file mode 100755
index 000000000..b6d9bda71
--- /dev/null
+++ b/1092/CH9/EX9.19/Example9_19.sce
@@ -0,0 +1,53 @@
+// Electric Machinery and Transformers
+// Irving L kosow 
+// Prentice Hall of India
+// 2nd editiom
+
+// Chapter 9: POLYPHASE INDUCTION (ASYNCHRONOUS) DYNAMOS
+// Example 9-19
+
+clear; clc; close; // Clear the work space and console.
+
+// Given data
+P = 8 ; // Number of poles in WRIM
+f = 60 ; // Operating frequency of the WRIM in Hz
+/// WRIM is driven by variable-speed prime mover as a frequency changer
+S_con_a1 = 1800 ; // Speed of the convertor in rpm
+S_con_a2 = 450 ; // Speed of the convertor in rpm
+
+f_con_b1 = 25 ; // Frequency of an induction converter in Hz
+f_con_b2 = 400 ; // Frequency of an induction converter in Hz
+f_con_b3 = 120 ; // Frequency of an induction converter in Hz
+
+// Calculations
+S = (120*f)/P ; // Speed in rpm of the rotating magnetic field
+
+// case a
+// Subscript a1 in f_con indicates case a 1st frequecy in Hz
+f_con_a1 = f*(1 + S_con_a1/S); // Frequency of an induction converter in Hz
+
+// Subscript a2 in f_con indicates case a 2nd frequency in Hz
+f_con_a2 = f*(1 - S_con_a2/S); // Frequency of an induction converter in Hz
+
+// case b
+// Subscript b1 in S-con indicates case b 1st speed of converter in rpm
+S_con_b1 = ( -1 + f_con_b1/f) * S ; // Speed of the convertor in rpm
+
+// Subscript b2 in S-con indicates case b 2nd speed of converter in rpm
+S_con_b2 = ( -1 + f_con_b2/f) * S ; // Speed of the convertor in rpm
+
+// Subscript b3 in S-con indicates case b 3rd speed of converter in rpm
+S_con_b3 = ( -1 + f_con_b3/f) * S ; // Speed of the convertor in rpm
+
+
+// Display the results
+disp("Example 9-19 Solution : ");
+
+printf(" \n Using Eq.(9-26),\n");
+
+printf(" \n a: f_con = %d Hz for %d rpm in opposite direction\n",f_con_a1,S_con_a1);
+printf(" \n    f_con = %d Hz for %d rpm in same direction\n",f_con_a2,S_con_a2);
+
+printf(" \n b: 1. S_con = %.f rpm, or %.f rpm in same direction.\n",S_con_b1,abs(S_con_b1));
+printf(" \n    2. S_con = %d rpm in opposite direction.\n",S_con_b2);
+printf(" \n    3. S_con = %d rpm in opposite direction to rotating stator flux.\n",S_con_b3);