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PS-FL1/FL1C
PS-FL1/FL1C
1-3.
BLOCK
DIAGRAM
ELECTROMOTANCE GENERATED ON FG BOARD
@) L-CH
fe)
R-CH
On the FG board, if the radial pattern
@
in Figure
The frequencies
detected
on the FG board are ob-
1 is considered as one conductor, when the rotor
tained as follows.
=
re
rotates, the conductor cuts the magnetic flux, electro-
For one radial pattern, sine-wave electromotance
is
ee
'
a
motance
is generated
on
the
conductor,
and its
generated one time for 2 SN poles.
.
3 = i Ke
R:
=
-
direction changes from the Fleming's right-hand rule
Therefore, when the rotor rotates one time:
zs &
<
a
to that in Figure 1.
256 (poles) + 2 = 128 (times)
e
epcaciaiee:
che
tae
Overall, the spacing of the radial pattern on the FG
For 45 rotations:
S
{i
Z
board and the rotation speed detection sine-wave
128 (times) x 45 (rpm) + 60 (seconds) = 96 (Hz)
=
=e
2.
magnet
peak is the same,
so the electromotance
In the same way, for 33!/3 rotations:
;
ee
SF Annan,
generated
in all of the
patterns
is directed
in a
128 (times) x 331/3 (rpm) + 60 (seconds) = 71.1 (Hz)
a8
re COOOO
uniform direction as shown in Figure 2 if the pattern
2
is considered as one loop.
a
Therefore, the electromotance
generated on the one
Hie
re
£
pattern
@) on the FG board has 256 poles worth of .
pS
ee
=e
e
=
cc
;
.
:
magnet
zs
sg
iat
=o
=
electromotance added. (circular integral method)
i
=,
vetorrotatipin
aa
=z
= 2
as
=O
co
i
:
1
pattern
CH)
@)
ai
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PLIOl
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ied
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.
FG board
to
i
a
3
s
s
as
we
8 o| ae] 5
g
;
FG board pattern
direction of current
2
Se
za
=
we @ Wo
(4) =
2 Sia
'
eS
FG Board Pattern Diagram (pattern surface)
eres
=
S=
aes
ae
a
a
to
~ofels|
tt
te
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ci
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a
>
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of
uj =
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z
z
Electromotance
3
Qs
g
z
Ai
°
7
a
Zz
direction
()
Z
r=
3
o
~
o
conductor
®
:
;
:
L
for N pole
wo
K
i
on
Sw
Fig. 2
Sw 2
Mw
8 &
S
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ost?
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aw
aN
°
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S
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=
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wt
us
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o
°
°
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for S pole
=
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es
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2
or
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negation pattern
2_
Ze
2
2
3
o
oe
4
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magnet flux
Ge
QF a
2
a
Fd
5
zs
a
xs
B e
e e
g s
electromotance
=
FS
cutting direction
=
magnet flux
4
|
:
|
motion
SYSTEM
CONTROL
INDICATION
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INPUT
a
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2/3
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oe
a
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magnet pole movement
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Fleming's right-hand rule
4
2
=| S|
pas
—~
s
Sw
2
=
=e
oO
=
a,
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Q
=
>
a
mn
ag
=
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=
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aa
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cad
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°
rn
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ae
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ow
aaw
=
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ee
——
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n
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—19—
.
,
—20—
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