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| author | priyanka | 2015-06-24 15:03:17 +0530 |
|---|---|---|
| committer | priyanka | 2015-06-24 15:03:17 +0530 |
| commit | b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b (patch) | |
| tree | ab291cffc65280e58ac82470ba63fbcca7805165 /1092/CH9/EX9.9 | |
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initial commit / add all books
Diffstat (limited to '1092/CH9/EX9.9')
| -rwxr-xr-x | 1092/CH9/EX9.9/Example9_9.sce | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/1092/CH9/EX9.9/Example9_9.sce b/1092/CH9/EX9.9/Example9_9.sce new file mode 100755 index 000000000..647a6926d --- /dev/null +++ b/1092/CH9/EX9.9/Example9_9.sce @@ -0,0 +1,77 @@ +// Electric Machinery and Transformers
+// Irving L kosow
+// Prentice Hall of India
+// 2nd editiom
+
+// Chapter 9: POLYPHASE INDUCTION (ASYNCHRONOUS) DYNAMOS
+// Example 9-9
+
+clear; clc; close; // Clear the work space and console.
+
+// Given data
+P = 8 ; // Number of poles in the SCIM
+f = 60 ; // Frequency in Hz
+S_r = 875 ; // Full-load Speed in rpm with rotor short-circuited
+R_r = 0.3 ; // rotor resistance per phase in ohm/phase
+R_x = 0.7 ; // Added resistance in ohm/phase
+R_x_a = 1.7 ; // Added resistance in ohm/phase (case a)
+R_x_b = 2.7 ; // Added resistance in ohm/phase (case b)
+R_x_c = 3.7 ; // Added resistance in ohm/phase (case c)
+R_x_d = 4.7 ; // Added resistance in ohm/phase (case d)
+
+// Calculations
+S = (120*f)/P ; // Speed in rpm of the rotating magnetic field
+s_o = (S - S_r)/S ; // Slip at rotor speed 875 rpm
+
+// case a
+s_r_a = s_o * (R_r + R_x_a)/R_r; // Rated slip
+S_r_a = S * (1 - s_r_a); // Full-load speed in rpm for added resistance R_x_a
+
+// case b
+s_r_b = s_o * (R_r + R_x_b)/R_r; // Rated slip
+S_r_b = S * (1 - s_r_b); // Full-load speed in rpm for added resistance R_x_b
+
+// case c
+s_r_c = s_o * (R_r + R_x_c)/R_r; // Rated slip
+S_r_c = S * (1 - s_r_c); // Full-load speed in rpm for added resistance R_x_c
+
+// case d
+s_r_d = s_o * (R_r + R_x_d)/R_r; // Rated slip
+S_r_d = S * (1 - s_r_d); // Full-load speed in rpm for added resistance R_x_d
+
+// Display the results
+disp("Example 9-9 Solution : ");
+
+printf(" \n Slip s_r = s_o*(R_r+R_x)/R_r \n Rotor speed S_r = S_o*(1-s)\n");
+
+printf(" \n Calculated value of s_o = %f , instead of 0.0278(textbook)",s_o)
+printf(" \n so slight variations in the answers below.\n");
+
+printf(" \n a: When R_x = %.1f ohm ",R_x_a);
+printf(" \n s_r = %.3f \n S_r = %.1f rpm \n",s_r_a,S_r_a );
+
+printf(" \n b: When R_x = %.1f ohm ",R_x_b);
+printf(" \n s_r = %.3f \n S_r = %.1f rpm \n",s_r_b,S_r_b );
+
+printf(" \n c: When R_x = %.1f ohm ",R_x_c);
+printf(" \n s_r = %.3f \n S_r = %.1f rpm \n",s_r_c,S_r_c );
+
+printf(" \n d: When R_x = %.1f ohm ",R_x_d);
+printf(" \n s_r = %.3f \n S_r = %.1f rpm \n",s_r_d,S_r_d );
+
+printf(" \n This example,verifies that slip is proportional to rotor resistance");
+printf(" \n as summarized below.");
+
+printf(" \n ___________________________________________________________________");
+printf(" \n R_T(ohm) = R_r+R_x \t\t Slip \t\t Full-load Speed(rpm)");
+printf(" \n ___________________________________________________________________");
+printf(" \n Given \t\t\t Given \t\t Given \t\ ");
+printf(" \n 0.3 \t\t\t 0.0278 \t 875 ");
+printf(" \n 0.3+0.1 = 1.0 \t\t 0.0926 \t 817");
+printf(" \n ___________________________________________________________________");
+printf(" \n Given \t\t\t Calculated \t Calculated \t\ ");
+printf(" \n a. %.1f + %.1f = %.1f \t\t %.3f \t\t %.1f ",R_r,R_x_a,R_r+R_x_a,s_r_a,S_r_a);
+printf(" \n b. %.1f + %.1f = %.1f \t\t %.3f \t\t %.1f ",R_r,R_x_b,R_r+R_x_b,s_r_b,S_r_b);
+printf(" \n c. %.1f + %.1f = %.1f \t\t %.3f \t\t %.1f ",R_r,R_x_c,R_r+R_x_c,s_r_c,S_r_c);
+printf(" \n d. %.1f + %.1f = %.1f \t\t %.3f \t\t %.1f ",R_r,R_x_d,R_r+R_x_d,s_r_d,S_r_d);
+printf(" \n ___________________________________________________________________");
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