Sony PS-LX22 - Circuit Description and Motor Operation; BSL DC Servo Motor Description; Motor Component Views

PS-LX2
2/B/c/(A)/B(A)
1.2.
CIRCUIT DESCRIPTION
MOTOR
The
method for
detecting
change in'turntable
rota-
tion speed for
the BSL
(Brush
and
Slotless) DC servo
motor
on
this set is different from
the
conventional
method
(detection
by MG
head
fixed
to the
frame).
On this set
it is
performed
by
the
FG
board fixed
to
the
stator.
Motor lnternal
Diagram
(upper
surface)
For
this
purpose,
256
poles
of magnetization
(SN
alternately) are
shallowly
layered on
the surface of
the drive magnetizer
(8
poles
alternately
SN) on the
magnet
used
to
rotate
the rotor.
The
frequencies
detected at
the
FG
board
are:
331/t rpm----71.i nz
45
rpm----
-
-96.OHz
(cross-section)
FG
burd
Motor
External
View
tworor
Loil
ServO Amp BOard
External
View of FG
Board
(with
rotor
removed)
shaft
L2
(external
flux noise negation
pattern)
-4-
J
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