blob: 663dc4e689de7567517385359557c11635b39300 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
|
//Calculate the speed
//Chapter 2
//Example 2.23
//page 127
clear;
clc;
disp("Example 2.23")
V=200; //voltage in volts
Ia=20; //armature current in amperes
Ra=0.5; //armature resistance in ohms
Rse=0.2; //field winding resistance in ohms
E=V-(Ia*(Ra+Rse));
printf("In first case,E=%fV",E)
//E=k*phi*N
N=1000; //speed in rpm
Kphi=E/N;
//a resistance R is connected in parallel with the series field which is called diverter
disp("when resistace R is added and new conditions")
I=20; //total current flowing
//current is equally devided between series field and diverter
Ise2=I/2;
//flux at 10A current is 20percent of flux at 20A current
p=0.70; //percentage of flux
Kpih1=p*Kphi;
E1=(V-((Ia*Ra)+(Ise2*Rse)));
printf("Induced emf=%fV",E1)
//new speed is N1
N1=E1/(p*Kphi)
printf("\nN1=%frpm",N1)
|
