Sony PS-11 - Page 4

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@ Motor Drive
The
TMD-21
Hall
Motor
employes
the
Hall
Element
to
detect
the
position
of
magnets.
When
an
N
pole
is
positioned
opposite
the
Hall
Element
H1
in
Fig.
1-2,
a
positive
voltage
is
generated
in
H1.
This
voltage
is
then
amplified
in
IC
1-3,
and
then
applied
to
Q8
after
passing
through
R31.
Once
Q8
is
turned
ON,
B+
voltage
is
applied
to
L1.
The
current
flowing
through
L1,
and
the
magnet’s
magnetic
field,
pro-
duces
a
magnetic
force
and
rotates
the
rotor
in
the
direction
of
the
arrow.
|
magnet WN
When
the
rotor
rotates
by
22°30’,
an
S
pol
be
positioned
opposite
the
Hall
Element
H?2
in
1-3,
thus
resulting
in
the
generation
of
4
neg:
voltage
in
H2.
This
voltage
is
amplified
by
IC
passed
through
R36,
thus
turning
Q11
ON,
resulting
in
B—
voltage
being
applied
to
L2.
current
flowing
through
L2,
and
the
magnet’s
:
netic
field,
produce
a
magnetic
force,
again
in
same
direction
as
before.
Therefore,
N
poles
and
S
poles
are
repeat
positioned
opposite
Hil
and
H2
Hall
Elem:
respectively
every
45°
of
a
rotation,
resultin;
the
generation
of
the
voltages
in
H1,
H2
which
used
to
produce
the
force
required
to
rotate
rotor.
H1 Rie.
(output
voltage)
ae
magnet
5
N
H2
a
a
ne
ee
foutput voltage)
22° 30°
Fig. 1-4.