diff options
Diffstat (limited to '2642/CH8/EX8.4/Ex8_4.sce')
| -rwxr-xr-x | 2642/CH8/EX8.4/Ex8_4.sce | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/2642/CH8/EX8.4/Ex8_4.sce b/2642/CH8/EX8.4/Ex8_4.sce new file mode 100755 index 000000000..5dea475ce --- /dev/null +++ b/2642/CH8/EX8.4/Ex8_4.sce @@ -0,0 +1,32 @@ +// FUNDAMENTALS OF ELECTICAL MACHINES
+// M.A.SALAM
+// NAROSA PUBLISHING HOUSE
+// SECOND EDITION
+
+// Chapter 8 : STARTING, CONTROL AND TESTING OF AN INDUCTION MOTOR
+// Example : 8.4
+
+clc;clear; // clears the console and command history
+
+// Given data
+Z_icr = 0.04+%i*0.5 // inner cage impedance per phase at standstill
+Z_ocr = 0.4+%i*0.2 // outer cage impedance per phase at standstill
+V = 120 // per phase rotor induced voltage at standstill in V
+
+// caclulations
+Z_com = (Z_icr*Z_ocr)/(Z_icr+Z_ocr) // combined impedance in ohm
+I_2 = V/abs(Z_com) // rotor current per phase in A
+R_2 = real(Z_com) // combined rotor resistance in ohm from Z_com
+T = I_2^2*R_2 // torque at stand still condition in syn.watt
+s = 0.06 // slip of 6%
+Z_icr6 = 0.04/s+%i*0.5 // inner cage impedance per phase at standstill
+Z_ocr6 = 0.4/s+%i*0.2 // outer cage impedance per phase at standstill
+Z_com6 = ((Z_icr6)*Z_ocr6)/((Z_icr6)+Z_ocr6) // combined impedance in ohm at 6% slip
+I2_6 = V/abs(Z_com6) // rotor current per phase in A at 6% slip
+R2_6 = real(Z_com6) // combined rotor resistance in ohm from Z_com6
+T6 = I2_6^2*R2_6 // torque at stand still condition in syn.watt
+
+// display the result
+disp("Example 8.4 solution");
+printf(" \n Torque at stand still condition \n T = %.2f syn.watt \n", T );
+printf(" \n Torque at stand 6 percent slip \n T6 = %.2f syn.watt \n", T6 );
|