Re: Hard drive motor


"ehsjr" <ehsjr@xxxxxxxxxxxxxxxx> wrote in message
news:wgLme.7408$zb.3570@xxxxxxxxxxx
> Watson A.Name - "Watt Sun, the Dark Remover" wrote:
> > "ehsjr" <ehsjr@xxxxxxxxxxxxxxxx> wrote in message
> > news:_cfme.7867$zb.5840@xxxxxxxxxxx
> >
> >>I was given an *old* CompaQ laptop with a bad hard drive.
> >>I pulled the drive, and intend to play with the motor,
> >>once I disassemble the drive. What kind of motor is it?
> >>What do I need to do to run it? The connection is much
> >>smaller than a regular hard drive, if that's any help.
> >
> >
> > I've pulled apart doaens of 3.5" HDDs recently, just to get rid of
all
> > the old 0.5 GB clunkers around just taking up space. I was taking a
few
> > parts off the MB, but now I just scrounge the magnets, some phillips
> > screws, and little else. Most of these drives are Maxtors. I've
only
> > pulled apart one 2.5" HDD. Here are some of my observations.
> >
> > There are just a few companies making the motors, one common one is
> > NIDEC. Some motors are permanently glued into the drive case, and
can't
> > be removed as a unit. No matter if they're removable or not,
they're a
> > bitch to get apart because they're glued together.
> >
> > I see mostly four terminals on them, three for the phases and a
common,
> > so it might be seen as a 'Y' configuration. Some have a couple more
> > terminals, apparently for a tachometer. I guess the four terminal
ones
> > use the output of a head to determine the speed, along with the head
> > position.
> >
> > Older drives may have used a separate chip to drive the motor, but I
> > think the trend has been to cram as much circuitry into a single
chip as
> > possible so that newer drives have the motor driver combined with
many
> > other functions. If so, then you'll have to roll your own to make
the
> > motor run.
> >
> > Many of the old Maxtors can be disassembled with a #1 phillips, but
most
> > of the newer and other drives require a #9 or #8 Torx and sometimes
a
> > smaller Torx. So you may have to swing by a hardware
> > store and pick up a couple Torx bits for your changeable-tip
magnetic
> > screwdriver.
> >
> > I found the KSH210 which is on many MBs is a low Vce(sat) PNP
transistor
> > that works well for the B.O.s if you're willing to put up with the
> > upside-down PNP config.
> >
> > I've found that the motors will light up the red LED connected
across
> > the coils very brightly. But it takes a quick spin to get the
voltage
> > high enough. Basically this proves that the motor has permanent
> > magnets. I also connected a red LED across the drive terminals of
the
> > 'voice coil' that drives the heads, and swinging it mack and forth
will
> > light up the LED brightly.
> >
> > Oh, one other thing. If you take off all four corners of the cover,
and
> > the cover doesn't pull off easily, then there's another screw or two
> > hidden under the label that you have to remove. Poke around with
the
> > torx until you find it/them.
> >
> > Watch your fingers! Those super magnets can snap together with so
much
> > force that they'll pinch you.
> >
> > Have fun.
> >
> >
> >>Ed

> Thanks, Watson. Exactly as you described. Now for
> my next trick - I have 4 memory "sticks" (or whatever
> you call them) (modules ?) from an old 433 machine: 3
> with 128 mb and 1 with 64 mb. Do you know of any place
> I could donate them? They are going to the trash can
> (I hate that) unless I can find somone to give them to.
> You're good with salvaged parts, so I figure you might
> know. They are free to whomever wants them.

> Ed

Donate them to Mike Terrell.


.

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