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| author | prashantsinalkar | 2017-10-10 12:27:19 +0530 |
|---|---|---|
| committer | prashantsinalkar | 2017-10-10 12:27:19 +0530 |
| commit | 7f60ea012dd2524dae921a2a35adbf7ef21f2bb6 (patch) | |
| tree | dbb9e3ddb5fc829e7c5c7e6be99b2c4ba356132c /3760/CH4/EX4.37 | |
| parent | b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b (diff) | |
| download | Scilab-TBC-Uploads-7f60ea012dd2524dae921a2a35adbf7ef21f2bb6.tar.gz Scilab-TBC-Uploads-7f60ea012dd2524dae921a2a35adbf7ef21f2bb6.tar.bz2 Scilab-TBC-Uploads-7f60ea012dd2524dae921a2a35adbf7ef21f2bb6.zip | |
initial commit / add all books
Diffstat (limited to '3760/CH4/EX4.37')
| -rw-r--r-- | 3760/CH4/EX4.37/Ex4_37.sce | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/3760/CH4/EX4.37/Ex4_37.sce b/3760/CH4/EX4.37/Ex4_37.sce new file mode 100644 index 000000000..574204290 --- /dev/null +++ b/3760/CH4/EX4.37/Ex4_37.sce @@ -0,0 +1,22 @@ +
+clc;
+V=230;//supply voltage in volts
+Ra=0.5;//armature resistance in ohm
+N=250;//rated speed of motor
+I=100;//rated current in ampere
+//For the separately excited dc motor torque-speed characteristics is given by Tl=500-W, where W is rotational speed in rad/sec & Tl is load torque in Nm.
+//At rated load, motor counter emf is -
+Ea=V-I*Ra;
+//Ea=Km*Wr; Km = motor constant, Wr = rated motor speed in rad/sec
+Wr=(2*%pi*250)/60;//rated motor speed in rad/sec
+Km=Ea/Wr;//motor constant in V-s/rad
+//Armature current at any speed W is given by-
+Ia=(V-Ea)/Ra;// ie. Ia=(230-Km*W)/0.5
+//Motor torque, Te=Km*Ia=(Km/0.5)*(230-Km*W)
+//Under steady state, motor torque ,Te=load torque, Tl
+//Thus, (Km/0.5)*(230-Km*W)=500-10*W
+W=(((V*Km)/Ra)-500)/((Km^2/Ra)-10);//angular speed in rpm
+N_=(W*60)/(2*%pi);//Speed in rpm
+Ia_=(230-Km*W)/0.5//armature current
+printf('Steady state speed of motor is %f rpm\n.',N_);
+printf('Armature current drawn by motor at steady state is %f A.',Ia_);
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