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Diffstat (limited to '3811/CH5')
| -rw-r--r-- | 3811/CH5/EX5.1/Ex5_1.jpg | bin | 0 -> 17508 bytes | |||
| -rw-r--r-- | 3811/CH5/EX5.1/Ex5_1.sce | 17 | ||||
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| -rw-r--r-- | 3811/CH5/EX5.2/Ex5_2.sce | 22 | ||||
| -rw-r--r-- | 3811/CH5/EX5.3/Ex5_3.jpg | bin | 0 -> 31458 bytes | |||
| -rw-r--r-- | 3811/CH5/EX5.3/Ex5_3.sce | 31 | ||||
| -rw-r--r-- | 3811/CH5/EX5.4/EX5_4.sce | 20 | ||||
| -rw-r--r-- | 3811/CH5/EX5.4/Ex5_4.jpg | bin | 0 -> 19859 bytes | |||
| -rw-r--r-- | 3811/CH5/EX5.5/Ex5_5.jpg | bin | 0 -> 26033 bytes | |||
| -rw-r--r-- | 3811/CH5/EX5.5/Ex5_5.sce | 23 | ||||
| -rw-r--r-- | 3811/CH5/EX5.6/Ex5_6.jpg | bin | 0 -> 17677 bytes | |||
| -rw-r--r-- | 3811/CH5/EX5.6/Ex5_6.sce | 17 |
12 files changed, 130 insertions, 0 deletions
diff --git a/3811/CH5/EX5.1/Ex5_1.jpg b/3811/CH5/EX5.1/Ex5_1.jpg Binary files differnew file mode 100644 index 000000000..0de34e10d --- /dev/null +++ b/3811/CH5/EX5.1/Ex5_1.jpg diff --git a/3811/CH5/EX5.1/Ex5_1.sce b/3811/CH5/EX5.1/Ex5_1.sce new file mode 100644 index 000000000..33def8fdb --- /dev/null +++ b/3811/CH5/EX5.1/Ex5_1.sce @@ -0,0 +1,17 @@ +//Book name: Fundamentals of electrical drives by Mohamad A. El- Sharkawi
+//chapter 5
+//example 5.1
+//edition 1
+//publisher and place:Nelson Engineering
+clc;
+clear;
+kpie=3; //flux in voltsec
+Vt=600; //voltage in volts
+Ra=2; //armature resistance in ohms
+Ia=5; //armature current at fullload in ampere
+Td=kpie*Ia; //rated torque in Nm
+disp(Td,'The rated torque in Nm is')
+Tst=(Vt*kpie)/Ra; //starting torque
+disp(Tst,'The starting torque in Nm is')
+Ist=Vt/Ra; //starting current
+disp(Ist,'The starting current in ampere is')
diff --git a/3811/CH5/EX5.2/Ex5_2.jpg b/3811/CH5/EX5.2/Ex5_2.jpg Binary files differnew file mode 100644 index 000000000..83353413e --- /dev/null +++ b/3811/CH5/EX5.2/Ex5_2.jpg diff --git a/3811/CH5/EX5.2/Ex5_2.sce b/3811/CH5/EX5.2/Ex5_2.sce new file mode 100644 index 000000000..18c9d91cf --- /dev/null +++ b/3811/CH5/EX5.2/Ex5_2.sce @@ -0,0 +1,22 @@ +//Book name: Fundamentals of electrical drives by Mohamad A. El- Sharkawi
+//chapter 5
+//example 5.2
+//edition 1
+//publisher and place:Nelson Engineering
+clc;
+clear;
+l=50; //load in hp
+f=60; //frequency in hertz
+n=1764; //full load speed in rpm
+ns=1800; //synchronous speed of motor in rpm
+Pr=.950; //rotational loss in kilowatts
+Pcu=1.600; //stator copper loss in kilowatt
+Pi=1.200; //iron loss in kilowatt
+Pout=l/1.34; //output power at full load is 50 hp in kilowatt
+Pd=Pout+Pr; //power developed in kilowatt
+s=(ns-n)/ns; //slip of the motor
+Pg=Pd/(1-s);
+Pin=Pg+Pcu+Pi; //input power in kilowatt
+efficiency=Pout/Pin; //motor efficiency
+efficiency=efficiency*100;//efficiency in percentage
+mprintf("The efficiency of the motor is %d percentage",efficiency)
diff --git a/3811/CH5/EX5.3/Ex5_3.jpg b/3811/CH5/EX5.3/Ex5_3.jpg Binary files differnew file mode 100644 index 000000000..8f24efaae --- /dev/null +++ b/3811/CH5/EX5.3/Ex5_3.jpg diff --git a/3811/CH5/EX5.3/Ex5_3.sce b/3811/CH5/EX5.3/Ex5_3.sce new file mode 100644 index 000000000..3e5a9128a --- /dev/null +++ b/3811/CH5/EX5.3/Ex5_3.sce @@ -0,0 +1,31 @@ +//Book name: Fundamentals of electrical drives by Mohamad A. El- Sharkawi
+//chapter 5
+//example 5.3
+//edition 1
+//publisher and place:Nelson Engineering
+clc;
+clear;
+l=50;//load in hp
+f=60;//frequency in hertz
+V=440;//voltage of the motor in volts
+p=4;//Number of poles of the motor
+Tmax=2.5;//maximum torque of the motor
+T=1;//motor torque
+smax=0.1;//maximum slip
+ns=(120*f)/p;//synchronous speed in rpm
+disp('a). Motor speed :')
+s=(T/Tmax)*(smax/2);//the equation is obtained from the equation T=3V^2s/wsR2
+n=ns*(1-s);//speed of the motor in rpm
+disp(n,'The speed of the motor at full load in rpm is')
+disp('b).Copper loss of the rotor')
+Pd=l/1.34;//power developed or Pout in kilowatt
+Pcu2=Pd*(s/(1-s));//copper loss in kilowatt which is obtained from two equationsPcu2=Pg*s,Pd=Pg*(1-s)
+Pcu=Pcu2*10^3;//copper loss in watt
+disp(Pcu,'The copper loss of the rotor in watt is')
+disp('c).Starting torque')
+//At starting slip s=1
+omega=(2*%pi*n)/f;
+Pout=Pd*10^3;//Pout value in watts
+Tst=(smax^(2)*Pout)/(s*omega);
+disp(Tst,'The starting torque in Nm is')
+//The answers vary due to round off error
diff --git a/3811/CH5/EX5.4/EX5_4.sce b/3811/CH5/EX5.4/EX5_4.sce new file mode 100644 index 000000000..ffb82f22f --- /dev/null +++ b/3811/CH5/EX5.4/EX5_4.sce @@ -0,0 +1,20 @@ +//Book name: Fundamentals of electrical drives by Mohamad A. El- Sharkawi
+//chapter 5
+//example 5.4
+//edition 1
+//publisher and place:Nelson Engineering
+clc;
+clear;
+R1=3; //stator resistance in ohm
+R2=2; //rotor resistance referred to stator in ohm
+Xeq=10; //equivalent inductive reactance in ohm
+l=10; //voltage reduction in percentage
+V=1; //assumed value of V
+TA=(1*V)^2; //starting torque at the rated voltage
+TB=(0.9*V)^2; //starting torque after 10% voltage reduction
+r=1-TB; //reduction in starting torque
+r=r*100; //reduction in starting torque in percentage
+mprintf("\nThe reduction in starting torque is %f percentage",r)
+Radd=sqrt(R1^(2)+Xeq^(2))-R2;
+mprintf("\nThe resistance added to the rotor circuit to achieve the maximum torque is %f",Radd)
+//The answer given in the book is wrong
diff --git a/3811/CH5/EX5.4/Ex5_4.jpg b/3811/CH5/EX5.4/Ex5_4.jpg Binary files differnew file mode 100644 index 000000000..b22c66b85 --- /dev/null +++ b/3811/CH5/EX5.4/Ex5_4.jpg diff --git a/3811/CH5/EX5.5/Ex5_5.jpg b/3811/CH5/EX5.5/Ex5_5.jpg Binary files differnew file mode 100644 index 000000000..3c4c474bd --- /dev/null +++ b/3811/CH5/EX5.5/Ex5_5.jpg diff --git a/3811/CH5/EX5.5/Ex5_5.sce b/3811/CH5/EX5.5/Ex5_5.sce new file mode 100644 index 000000000..349d43faa --- /dev/null +++ b/3811/CH5/EX5.5/Ex5_5.sce @@ -0,0 +1,23 @@ +//Book name: Fundamentals of electrical drives by Mohamad A. El- Sharkawi
+//chapter 5
+//example 5.5
+//edition 1
+//publisher and place:Nelson Engineering
+clc;
+clear;
+P=40; //load of an industrial plant in Mw
+pf=.85; //power factor lagging
+pfnew=.95 //To improve new power factor
+V=5000; //motor rated voltage in volts
+Xs=5; //synchronous reactance in ohm
+c=200; //constant value given
+Vt=V/3^(1/2);
+a=acosd(pf); //power factor angle of the load in degree
+Ql=P*tand(a); //load reactive power in KVAR
+Qtot=P*tand(acosd(pfnew)); //total reactive power for .95 power factor lagging
+disp(Qtot,'The total reactive power for .95 power factor lagging in KVAR is')
+Qm=Qtot-Ql;
+Vt=(V/sqrt(3));
+Ef=((Qm*Xs)/(3*Vt))+Vt;
+If=Ef/c;
+disp(If,'The excitation current required to improve overall power factor of the plant in A is')
diff --git a/3811/CH5/EX5.6/Ex5_6.jpg b/3811/CH5/EX5.6/Ex5_6.jpg Binary files differnew file mode 100644 index 000000000..dcbfe3c1a --- /dev/null +++ b/3811/CH5/EX5.6/Ex5_6.jpg diff --git a/3811/CH5/EX5.6/Ex5_6.sce b/3811/CH5/EX5.6/Ex5_6.sce new file mode 100644 index 000000000..3caed4519 --- /dev/null +++ b/3811/CH5/EX5.6/Ex5_6.sce @@ -0,0 +1,17 @@ +//Book name: Fundamentals of electrical drives by Mohamad A. El- Sharkawi
+//chapter 5
+//example 5.6
+//edition 1
+//publisher and place:Nelson Engineering
+clc;
+clear;
+V=2300; //rated voltage of the synchronous motor in volt
+Vt=V/3^(1/2);
+f=60; //frequency in Hertz
+p=6; //number of poles
+Tl=5000; //constant torque of the load in Nm
+Xs=6; //synchronous reactance of the motor in ohm
+ns=(120*f)/p; //synchronous speed of the motor in rpm
+omegas=(2*%pi*ns)/60;
+Ef=(Tl*omegas*Xs)/(3*Vt); //The minimum excitation that machine must maintain to provide the needed torque
+disp(Ef,'The minimum excitation that machine must maintain to provide the needed torque in volt is:')
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