initial commit / add all books

1 files changed, 44 insertions, 0 deletions

diff --git a/1445/CH10/EX10.7/Ex10_7.sce b/1445/CH10/EX10.7/Ex10_7.sce
new file mode 100644
index 000000000..0e53dbb1b
--- /dev/null
+++ b/1445/CH10/EX10.7/Ex10_7.sce
@@ -0,0 +1,44 @@
+//CHAPTER 10- THREE-PHASE INDUCTION MACHINES
+//Example 7
+
+disp("CHAPTER 10");
+disp("EXAMPLE 7");
+
+//VARIABLE INITIALIZATION
+P=4;                           //number of poles
+f=50;                          //frequency in Hz
+r2=0.1;                        //rotor resistance in Ohms
+X2=2;                          //standstill reactance in Ohms
+E1=100;                        //induced emf between slip ring in Volts
+N_r=1460;                      //full load speed in rpm
+
+//SOLUTION
+
+//solution (i)
+N_s=(120*f)/P;
+s_fl=(N_s-N_r)/N_s;
+disp(sprintf("(i) The slip at full load is %.2f %%",s_fl*100));
+s_m=r2/X2;
+disp(sprintf("The slip at which maximum torque occurs is %.0f %%",s_m*100));
+
+//solution (ii)
+E2=E1/sqrt(3);                 //phase voltage=(line voltage)/sqrt(3) for star connection
+disp(sprintf("(ii) The emf induced in rotor is %.1f V per phase",E2));
+
+//solution (iii)
+X2_dash=s_fl*X2;
+disp(sprintf("(iii) The rotor reactance per phase is %.4f Ω",X2_dash));
+
+//solution (iv)
+z=sqrt((r2^2)+(X2_dash)^2);
+I2=(s_fl*E2)/z;
+disp(sprintf("(iv) The rotor current is %.2f A",I2));
+
+//solution (v)
+pow_fact_r=r2/z;
+disp(sprintf("(v) The rotor power factor is %.3f (lagging)",pow_fact_r));
+
+//END
+
+ 
+