diff options
Diffstat (limited to '3760/CH4/EX4.41/Ex4_41.sce')
| -rw-r--r-- | 3760/CH4/EX4.41/Ex4_41.sce | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/3760/CH4/EX4.41/Ex4_41.sce b/3760/CH4/EX4.41/Ex4_41.sce new file mode 100644 index 000000000..f555bf515 --- /dev/null +++ b/3760/CH4/EX4.41/Ex4_41.sce @@ -0,0 +1,16 @@ +clc;
+V=240; // rated voltage of dc shunt motor
+n=800; // rated speed of dc shunt motor
+i=50; // rated current of dc shunt motor
+ra=0.2; // armature resistance
+pr=0.6; // reduction in load torque as a fraction of full load torque
+rg=2; // series resistance in armature circuit
+fr1=0.04; // weakening of field flux at full load
+fr2=0.02; // weakening of field flux at 60% of full load
+Ea1=V-(i*ra); // counter EMF at rated load
+ia2=(i*pr)*((1-fr1)/(1-fr2)); // armature current at reduced load torque
+Ea2=V-ia2*(rg+ra); // counter EMF at reduced load torque
+n2=(n*Ea2*(1-fr1))/(Ea1*(1-fr2));
+printf('Motor speed at reduced load torque is %f rpm',n2);
+
+
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