initial commit / add all books

1 files changed, 25 insertions, 0 deletions

diff --git a/3760/CH3/EX3.4/Ex3_4.sce b/3760/CH3/EX3.4/Ex3_4.sce
new file mode 100644
index 000000000..438dae1c9
--- /dev/null
+++ b/3760/CH3/EX3.4/Ex3_4.sce
@@ -0,0 +1,25 @@
+clc;

+p1=4; // number of poles in slip ring induction motor

+p2=6; // number of poles in synchronous  motor

+f=50; // frequency of supply

+ns=(120*f)/p2; // synchronous motor speed

+ni=(120*f)/p1; // induction motor speed

+disp('case a(1)'); 

+// when synchronous motor is driven in direction opposite to the rotating field produced the induction motor stator

+nr=ns+ni; // relative speed

+F=(p1*nr)/120; 

+printf('Frequency of EMF at rotor slip ring terminals is %f Hz\n',F);

+disp('case a(2)');

+// when synchronous motor is driven in direction of the rotating field produced the induction motor stator

+nr=ni-ns; // relative speed

+F=(p1*nr)/120; 

+printf('Frequency of EMF at rotor slip ring terminals is %f Hz\n',F);

+disp('case b'); 

+fn=150; // frequency of rotor terminal voltage required

+// let new number of pole be pn then relative speed is nr=ns+(120*50)/pn;

+pn=((fn*120)-(120*f))/ns; 

+printf('Number of poles that the induction motor must have is %f \n',pn);

+disp('case c'); 

+pi=8; // number of poles in induction motor

+ps=(120*f*pi)/((fn*120)-(120*f));

+printf('Number of synchronous motor poles required is %f',ps);