A simple alternator is a device that generates an emf. A rectangular loop is rotated with constant angular speed w about the axis shown. The magnetic field is uniform and constant. At time t = 0,0 = 0. Determine the induced emf.
A simple alternator is a device that generates an emf. A rectangular loop is rotated with constant angular speed w about the axis shown. The magnetic field is uniform and constant. At time t = 0,0 = 0. Determine the induced emf.
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Transcribed Image Text:A simple alternator is a device that generates an emf. A
rectangular loop is rotated with constant angular speed w about
the axis shown. The magnetic field is uniform and constant. At
time t = 0,0 = 0. Determine the induced emf.
(a)
(b)
Loop (seen-
end-on)
Flux decreasing
most apidly.
largest positive emf.
Flux increasing
st apilly.
largest negative emf.
Brush
Flux at its most
Flux at its most
Slip
rings
negative value,
emf is zero
positive value,
emf is ero.
-Brush
The angle as a function of time: 0 = wt
The induced emf:
d
Ec =
(BA cose) = wBAsinwt
dt
(9.4)
Dr. Nguyen Quy Tuan, FP, UD-UED
21
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