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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 /3784/CH1/EX1.17/Ex1_17.sce | |
| parent | b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b (diff) | |
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initial commit / add all books
Diffstat (limited to '3784/CH1/EX1.17/Ex1_17.sce')
| -rw-r--r-- | 3784/CH1/EX1.17/Ex1_17.sce | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/3784/CH1/EX1.17/Ex1_17.sce b/3784/CH1/EX1.17/Ex1_17.sce new file mode 100644 index 000000000..06f475a7f --- /dev/null +++ b/3784/CH1/EX1.17/Ex1_17.sce @@ -0,0 +1,55 @@ +clc
+// Variable Initialization
+Vm=230//Supply Voltage in Volts
+Ra=2//Armature circuit resistance in Ohm
+L=50e-3//Inductance in mH
+N=1500//Motor speed in Rpm
+V=220//Rated voltage of motor in Volts
+a=60//firing angle in Degree
+a1=120//firing angle in Degree
+I=10//motor current in Amp
+f=50 //source Frequency in Hz
+
+//Solution
+P=atand((2*%pi*f*L)/Ra) // In Degree
+Z=sqrt((Ra^2)+((2*%pi*f*L)^2)) //Impedance In Ohm
+Eb=V-(I*Ra) //back emf in Volts
+w=(2*%pi*N)/60 //Angular Speed in rad/sec
+K=Eb/w//value obtain is 1.2732395 approximating to 1.27
+K=1.27//Approximation of K as per book and our obtained value
+//At No Load
+Wo=(Vm*1.414)/K//Angular Speed in rad/sec(For 0<a<%pi/2)
+No=Wo*(60/(2*%pi))//Speed in Rpm
+Cot_P=1/(tand(P))
+A=exp(-%pi*Cot_P)
+AA=(Ra*Vm*1.414)/(K*Z)
+Wmc=AA*sind(a-P)*((1+A)/(A-1))//Critical Speed in rad/Sec
+Wrpm=(Wmc*60)/(2*%pi) //speed in rpm
+Eb1=(Wrpm*Eb)/N
+//By trial and error method
+b=240.45//Beta in Degree
+bx=249.45//Beta in Degree
+Va=((Vm*1.414)*(cosd(a)-cosd(bx))+(%pi+(a-b)*(%pi/180))*(Eb1))*(1/%pi) //Armature voltage in Volts
+Ia=(Va-Eb1)/Ra //Armature current in Amp
+T=K*Ia//Torque in N-m
+
+//At a1=120
+Wmc1=AA*sind(a1-P)*((1+A)/(A-1))//Critical Speed in rad/Sec
+Wrpm1=(Wmc1*60)/(2*%pi) //speed in rpm
+Wo1=(Vm*1.414*sind(a1))/1.273//Angular Speed in rad/sec(For 0<a<%pi/2)&K=1.273
+No1=Wo1*(60/(2*%pi))//Speed in Rpm
+Eb2=(Wrpm1*Eb)/N
+//By trial and error method
+b1=217.2//Beta in Degree
+Va1=((Vm*1.414)*(cosd(a1)-cosd(b1))-((%pi+((a1-b1)*(1/180))*%pi)*Eb2))*(1/%pi) //Armature voltage in Volts
+Ia1=(Va1-Eb2)/Ra //Armature current in Amp
+T1=K*Ia1//Torque in N-m
+
+//Results
+printf('\n\n The motor No load Speed =%0.1f RPM \n\n',No)
+printf('\n\n The motor Critical Speed =%0.1f RPM \n\n',Wrpm)
+printf('\n\n The motor Torque =%0.1f N-m \n\n',T)
+printf('\n\n The motor No load Speed =%0.1f RPM \n\n',No1)
+printf('\n\n The motor Critical Speed =%0.1f RPM \n\n',Wrpm1)
+printf('\n\n The motor Torque =%0.1f N-m \n\n',T1)
+//The answers vary due to round off error
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