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Diffstat (limited to '3731/CH6/EX6.13')
| -rw-r--r-- | 3731/CH6/EX6.13/Ex6_13.sce | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/3731/CH6/EX6.13/Ex6_13.sce b/3731/CH6/EX6.13/Ex6_13.sce new file mode 100644 index 000000000..e2b1a1b86 --- /dev/null +++ b/3731/CH6/EX6.13/Ex6_13.sce @@ -0,0 +1,30 @@ +//Chapter 6:Induction Motor Drives +//Example 13 +clc; + +//Variable Initialization + +//Ratings of the star connected Induction motor are same as that of Ex-6.9 +f=50 // frequency in HZ +Vl=400 //line voltage in V +P=4 // number of poles +N=1370 //rated speed + +//Parameters referred to the stator +Xr_=3.5 // rotor winding reactance in ohm +Xs=Xr_ // stator winding reactance in ohm +Rr_=3 // resistance of the rotor windings in ohm +Rs=2 // resistance of the stator windings in ohm + +//Solution +Wms=4*%pi*f/P +f1=60 //frequency in Hz during speed control of the motor +K=f1/f //the value of K at 60Hz +x=Rs+sqrt(Rs**2+K**2*(Xs+Xr_)**2) +Tmax_=3/(2*K*Wms)*(Vl/sqrt(3))**2/x //torque at 60 Hz frequency +z=Rs+sqrt(Rs**2+(Xs+Xr_)**2) +Tmax=3/(2*Wms)*(Vl/sqrt(3))**2/z //maximum torque +ratio=Tmax_/Tmax //ratio + +//Result +mprintf("Ratio of Motor breakdown torque at 60Hz to rated torque at 50Hz is:%.3f",ratio) |