MAGNETIC CIRCUITS
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Magnetism Summary
Figure 26 Magnetic Current with Closed Iron Path
Electrical Science Volume 1 of 4
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Basic Electrical Theory
MAGNETIC CIRCUITS
MAGNETIC CIRCUITS
What is a magnetic circuit? To better understand magnetic circuits, a basic
understanding of the physical qualities of magnetic circuits will be necessary.
EO 1.8
EXPLAIN the physical qualities of a simple magnetic circuit,
including relationships of qualities and units of measurements.
EO 1.9
Given the physical qualities of a simple magnetic circuit,
CALCULATE the unknown values.
EO 1.10
DESCRIBE the shape and components of a BH magnetization
curve.
EO 1.11
EXPLAIN the cause of
hysteresis losses
.
EO 1.12
Given Faraday’s Law of induced voltage:
a.
DESCRIBE how varying parameters affect induced voltage.
b.
CALCULATE voltage induced in a conductor moving through
a
magnetic field
.
EO 1.13
STATE Lenz’s Law of
induction
.
Magnetic
Circuits
A magnetic circuit can be compared with an electric current in which EMF, or voltage, produces
a current flow. The ampere-turns (NI), or the
magnetomotive force
(F
_{m}
or mmf), will produce
a magnetic flux
F
(Figure 26). The mmf can be compared with EMF, and the flux (
F
) can be
compared to current. Equation (1-16) is the mathematical representation of
magnetomotive force
derived using Ohm’s Law,
.
I
E
R
F
=
(1-16)
F
_{m}
R
mmf
R
where
F
=
magnetic flux, Wb
F
_{m}
=
magnetomotive force (mmf), At
R
=
reluctance
,
At
Wb
Rev. 0
Page 37
ES-01
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