Table of Contents
Advertisement
Stepper Motor Control
The stepper motor control circuits generate the two phases of
tile
step
se4Llence
based
on
information
from
tho step and direction inputs.
These
tVJO
f:Jhases are fed to the
stepp(~r
motor drivers,
which IH-oduce
the current through the motor's coils.
Stepper Motor
The
for
to a
4.5
stepper
motor is a sinyle phase motor, which rotates 3.6 degrees
each
phase.
The capstan and split band translates this rotation
one track linear movement of the head carria(je assembly.
READ/WRITE DATA
The components of the drive required to read and write data are:
1.
Read/Write Head Assembly
2.
Side Select circuits
3.
Write/Erase circuits
4.
Read Data circuits
Read/Write Head Assembly
The
read/write head(s) are
'llass bonded,
ferrite cores
mounted
in
a
ceramic
structure.
The lower head structure is mounted in a fixed
position
to
a
plastic
carriage.
The
upper
head is mounted to a
'limballed flexure to conform to the diskette.
The head carriage assembly is attached to the chassis on 'luide rails.
It is positioned by a split band attached to the stepper motor.
Side Select Circuits
The
Side
interface
signal is
a
volta'le
to
flow in
low, Side I
tap of Head
Select
si'lnal
is derived from the host controller via the
connector
J8,
Pin
32.
This si'lnal is buffered.
I f
the
high
at
the
interface, Side U is selected by applyin'l
potential
on the center tap of Head U, and allows current
the
coils
of Head U.
If the signal at the interface is
1S
selected by
applying a volta'le potential on the center
1, allowin'l current to flow in the coils of Head 1.
4-8
Advertisement
Table of Contents
