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Diffstat (limited to '2297/CH6/EX6.3/Ex6_3.sce')
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1 files changed, 30 insertions, 0 deletions
diff --git a/2297/CH6/EX6.3/Ex6_3.sce b/2297/CH6/EX6.3/Ex6_3.sce new file mode 100755 index 000000000..19acbd9b7 --- /dev/null +++ b/2297/CH6/EX6.3/Ex6_3.sce @@ -0,0 +1,30 @@ +//Example 6.3// spped ,torque and efficiency +clc; +clear; +close; +format('v',6) +v=200;//voltage in volts +r=100;//resistance in ohms +ish=v/r;//shunt current in amperes +i=4;//current in amperes +nla=i-ish;//no load armature current in amperes +w=8;//powerin kW +ifl=(w*10^3)/v;//full load current in amperes +fla=ifl-ish;//full load armature current in amperes +r1=0.6;//internal resistance in ohms +ebo=(v-(ish*r1));//voltage in volts +eb=(v-(fla*r1));//voltage in volts +no=700;//number of rpm +n=no*(eb/ebo);//number of rpm +ta=((eb*fla*60)/(2*n));//armature torque in N-m +nlpi=v*i;//no load power input in watts +cl=(ish^2*r1);//copper losses in watts +cl=nlpi-cl;//total copper lossses in Watts +flacl=(fla^2*r1);//full load armmature copper losses in Watts +tfll=flacl+cl;//total full load losses in Watts +flo=(w*10^3)-tfll;//full load output in Watts +ef=((flo)/(w*10^3))*100;//efficiency +disp(n,"speed is,(rpm)=") +disp(ta,"armature torque is, (N-m)=") +disp(ef,"full load motor efficiency is ,(%)=") +//armature torque is calculated wrong in the textbook |