Principles of Electric Machines and Power Electronics
These notes cover the course work of Electromagnetic Systems also known as Power Engineering. Sections include: Magnetic Circuits (Inductance, Energy Loss), Ideal and Non-Ideal Transformers (Voltage Regulation, Open/Close Circuit Tests, Efficiency), Electromagnetic Conversion (Simple Solenoid, Rela...
Magnetic materials used to shape & direct magnetic fields
•
are
{ Magnetic Circuits }
BASICS
Magnetic formed ferromagnetic
°
circuits are
by
materials .
In electric machines the magnetic field
°
most :
or flux is produce by passing an electric current
through coils wound an f- mag .
materials
MAGNETIC °
Also called magnetic flux intensity
Measure of of magnetic field lines
°
FLUX the amount
passing through a surface
of magnetic circuits
"
It's
"
.
like the current
.
Measured in Atm
men
,i H When conductor
current through
-
a passes a a
,
RELATION
magnetic field radiates from it :
* Use right hand rule
µ
*ddd÷
°
The relationship between get and magnetic
field intensity is defined by Ampere 's circuit law
"
integral of the
's
Ampere law The magnetic
°
:
line
field closed path equal
intensity H around a is
to total current linked the contour
"
the by
Jo
H de
=
fi = i it is tis .
. .
-
-6 .
"
- - -
to
"
Cantave
- .
-
Tangle exists
if an
:
JH a dl cos A =
is i
, -
s a basic example consider a circle :
ftt.de Ii
Hf
=
•
Is
Hfde
=
Ii
if H2 tr
= i
H
tier
=
µ
Number of field lines
MAGNETIC FLUX
passing through
0
a given area
DENSITY
Liege
.
B = = T I Tesla ) '
web
.
B -
H °
Magnetic flux intensity H produces a magnetic
RELATIONSHIP flux density B everywhere it exists
UH B hour H
B & =
=
→
I relative
permeability perky permeability
ofthe medium ability
of free space
-
7
= I
.
others = 2am
-
Good
.AE/Cu/insulatars--4TTX1O
.
Relative
permeability large :
a value ur implies
that a small current can
produce a large flux
density
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