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3. Because
of
the low potential at
pin
(a), Q2
is
ON. Pin
(b) is
at high potential,
so
Q6 and Q9
are ON. Pin
(c) is at
standard
potential
-
a
standard bias
is
applied which keeps transistors
Q4, Q7 and Q10
OFF.
4.
A
current
caused
by
voltage
V6g
flows through
Q2
-
(2)
-
coil
La
-
coil LB
-
(4)
-
Q9,
caus-
ing
a
north
pole
to
appear
at
L"
and a
south
pole at
La.
5.
This magnetism
causes
the rotor
to
start rotat-
ing.
After 20
degrees
of
rotation, the
signal
levels
at
terminals a,
b
and
c will
be come
as
shown
in
Fig. 11-b
II,
and the current path of
the drive current is
changed.
After
another
20
degrees
of
rotation, the
signals
become
as
in
Fig.
11-c
III,
and
the
drive current path is
changed
again.
This process continues,
with
current path
changes
every 20
degtees
and signal levels
as
in
Figs. 11-d
IV,
11--e
V,
and 11-f
VI,
whereupon
the cycle retums
to
11-a
and repeats.
6.
Also,
a
control
signal
from the
Forward/Reverse
Command Block is applied
to
the control input
terminal, and this controls
the
current flow
through the motor windings.
Fig.
1
1-a
Fig.
i
1-b
Fig.
1
1-c
6
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Fig.
11-d
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