Page 541 - Basic Electrical Engineering
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Figure 6.6 Two windings of a transformer wound on a common core
A sinusoidally varying flux is represented as
ϕ = ϕ sin ωt
m
where ϕ is the instantaneous value, and ϕ is the maximum value
m
Considering ϕ = ϕ sin ωt,
m
we get
e = − N ϕ ω cos ωt
m
= − N ϕ ω[−sin (ωt − π/2)]
m
= N ϕ ω sin (ωt − 90°)
m
This equation is of the form
e = E sin (ωt − 90°)
m
where
