LG GR-K18PBS Service Manual - Page 49

<FI, Change, current, surface, <Fig., magnetic, velocity

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arac ens ics oT earn par • Operating principle Where the AD power ib cormected to the cod of the Shading pole motor, the central axis-of the magnetic field-shifts-in the bold arrow direct s the Mlfral awi5a=rnoves, the rotor moves rn the bdUle dneclwn tU tUIll t le MOM. Why doestecceentral xis of the magnetic field shift? - shows a-diagram of AC current changing as t changes. If you=lerilc=at changes=u4nagnetic velocity in "a' where tilt, curter ci•ruptly-increases7the-velocity increases the current increases in the main pole. But in-the shading pole, the negative effect of the increase iFgenerated from the shading-coil to reduce tliu vulucity shifting the Guider of the magnette-field to the main pole-In "b" zone,-fhe-ehange in current is minimal and the negative effect-ef shading coil is minimal to have the center of the magnetic4ield in the middle shown in . In "c" zone, the velocity-of the main pole decreases-but with the negative effect-increasing the vel from-the-shading pole-side e-center shifts to the shading p side. A-s-shown7the-center of the magnetic field shifts from th main pole le-the-shading pole to rotate the rotor. Current / Ti Change of AC current Pole b zone one on the pole surface Change in magnetic velocity by changes in current

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arac
ens
ics
oT
earn
par
•
Operating
principle
Where
the
AD
power
ib
cormected
to
the
cod
of
the
Shading
pole
motor,
the
central
axis
-
of
the
magnetic
field
-
shifts
-
in
the
bold
arrow
direct
s
the
Mlfral
awi
5
a=rnoves,
the
rotor
Current
/
rn
bdUle
dneclwn
tU
Why
doestece
central
xis
of
the
magnetic
field
shift?
—
<Fig.
1>
shows
a
-diagram
of
AC
current
changing
as
t
changes.
If
you=lerilc=at
changes=u4nagnetic
velocity
in
"a'
where
tilt,
curter
ci•ruptly
-
increases7the
-
velocity
increases
the
current
increases
in
the
main
pole.
But
in
-the
shading
pole,
<FI
1>
Change
of
AC
current
the
negative
effect
of
the
increase
iFgenerated
from
the
shading
-
coil
to
reduce
tliu
vulucity
shifting
the
Guider
of
the
magnette
-
field
to
the
main
pole
-In
"b"
zone,-fhe-ehange
in
current
is
minimal
and
the
negative
effect-ef
shading
coil
is
minimal
to
have
the
center
of
the
magnetic4ield
in
the
middle
shown
in
<Fig.
2>.
In
"c"
zone,
the
velocity
-of
the
main
pole
decreases
-but
with
the
negative
effect
-increasing
the
vel
from
-the
-shading
pole-side
e-center
shifts
to
the
shading
side.
A
-
s
-
shown7the
-
center
of
the
magnetic
field
shifts
from
th
main
pole
le
-the
-shading
pole
to
rotate
the
rotor.
Ti
p
Pole
b
zone
one
on
the
pole
surface
<Fig.
2>
Change
in
magnetic
velocity
by
changes
in
current