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60 Chapter 4. Single Phase AC Circuits
Φ
N S
R
Slip rings
Figure 4.1: Generation of sinusoidal emf
N S
(a) Maximum flux linkage (Φ m) when
◦
θ = 0
θ
φm cosθ
N S
(b) Flux linkage = Φ m cos θ
N S
(c) Minimum flux linkage (zero) when
θ = 90 ◦
Figure 4.2: Flux linkage when coil rotates in a magnetic field
60
