Page 32 - Basics of Electrical, Electronic and Communication

7.3. Simple loop generator 137

A D D A

B C C B

a b b a

M L M L
(a)

emf

0 90 180 270 360 θ
(b)

Figure 7.3: emf generated by loop generator

Figure 7.2 shows the arrangement of a single turn coil ABCD rotat-
ing at a constant speed in a uniform magnetic field produced by two
1
poles. The two ends of the coil are connected to a split ring . An emf
is induced in the coil which is proportional to the rate of flux linkage.
Figure 7.3(a) shows the schematic diagram of coil connections with
split ring. The direction of induced current in the coil is from A to B
and from C to D during the first half revolution. Therefore the current

1
A slip ring splitted into two

137