1 files changed, 37 insertions, 0 deletions
diff --git a/1319/CH6/EX6.21/6_21.sce b/1319/CH6/EX6.21/6_21.sce
new file mode 100644
index 000000000..b4cbf3bf7
--- /dev/null
+++ b/1319/CH6/EX6.21/6_21.sce
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+//Rated torque calculation by resistance addition
+
+clc;
+clear;
+
+V=240;
+I=40;
+Ra=0.3;
+N1=1500/60;// speed in rotations per sec
+N2=1000/60;
+
+Pi=V*I;// Power input
+
+Pc=(I^2)*Ra; // Copper loss
+
+Po=Pi-Pc;
+
+T=Po/(2*%pi*N1);// Rated torque
+
+R1=V/I; // Back EMF is zero
+
+Rex1=R1-Ra;
+
+//Eb directly to N(speed)
+
+Eb1500=V-(I*Ra);
+Eb1000=N2*Eb1500/N1;
+
+R=poly([0 1],'R','c');
+
+x=(V-Eb1000)-(I*(R+Ra)); // Characteristic equation to find external resistance
+
+Rex2=roots(x);
+
+printf('The value of the resistance to be added to obtain rated torque \n')
+printf('a) At starting = %g ohms\n',Rex1)
+printf('b) At 1000 rpm = %g ohms\n',Rex2)