blob: ec0e70ce44ad5e2f3d5d5632d34f94e7082a9c86 (
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
|
//calculating resistance required in series
//Chapter 2
//Example 2.18
//page 124
clear;
clc;
disp("Example 2.18")
V=230; //voltage supply in volts
Ia=20; //armature current in amperes
Ra=0.5; //armature resistance in ohms
E=V-(Ia*Ra);
printf("E=%dV",E)
disp("when extra resistance is added in the armature circuit,the speed is halved")
E2=E/2;
R=((V-E2)/Ia)-Ra;
disp("The load torque is conatant")
printf("extra resistance in the armature circui,R=%fohms",R)
disp("The load torque directly proportional to square of speed")
disp("if N is halfed, Iais one-fourthed")
Ia2=Ia/4;
R=((V-E2)/Ia2)-Ra;
printf("extra resistance in the armature circui,R=%fohms",R)
|
