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diff --git a/3811/CH7/EX7.5/Ex7_5.jpg b/3811/CH7/EX7.5/Ex7_5.jpg Binary files differnew file mode 100644 index 000000000..04219237f --- /dev/null +++ b/3811/CH7/EX7.5/Ex7_5.jpg diff --git a/3811/CH7/EX7.5/Ex7_5.sce b/3811/CH7/EX7.5/Ex7_5.sce new file mode 100644 index 000000000..860fc8c16 --- /dev/null +++ b/3811/CH7/EX7.5/Ex7_5.sce @@ -0,0 +1,25 @@ +//Book Name: Fundamentals of electrical drives by Mohamad A. El- Sharkawi
+//chapter 7
+//example 7.5
+//edition 1
+//publisher and place:Nelson Engineering
+clc;
+clear;
+V=480;//terminal voltage in volt
+p=6;//number of poles
+Pout=30*746;//output power interms of watt
+f=60;//frequency in hertz
+R1=0.5;//stator resistance in ohm
+R2=0.5;//rotor resistance reffered to stator in ohm
+ns=1200;//synchronus speed in rpm
+rps=ns/60;
+omegas=(2*%pi*rps);//angular synchronous speed
+Td=120;//load torque constant
+s=(Td*omegas*R2)/V^2;
+n=ns*(1-s);//the speed at full voltage in rpm
+n=ceil(n)
+Vnew=0.8*V;//when voltage is reduced by 20%
+snew=(V^2*s)/Vnew^2;//new slip after the reduction of 20% of the rated voltage
+nnew=ns*(1-snew);//new speed of the motor in rpm
+nnew=ceil(nnew)
+mprintf("The speed of the motor after the reduction of the rated voltage is %d rpm",nnew)
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