Russ NelsonRuss Nelson's personal blog
Mon, 16 Oct 2006Reusing a floppy stepper motorThis is the second
in a series of postings about the Makezine controller. The first
one was the Jedi Cursor.
Most 5.25" floppy disk drives have a stepper motor in them for
positioning the head, plus interesting widgets like optical
emitters and detectors. With a little bit of work, they can be
removed and put back into service with your Makezine controller. I
put together a set of photos showing how I disassembled my floppy
disk drive and removed the useful bits. A stepper motor has
magnets, poles, and windings. The windings go around the poles, and
you energize the windings in a specific order to make the motor
turn in one direction or the other. A motor can have four, five, or
six wires coming out of it. You will need to use an ohmmeter to
determine the meaning of the wires. 4. A stepping motor with four
wires has only two windings and is bipolar. You have to be able to
drive it with positive and negative voltages. In order to make the
magnets spin around, you need to energize the windings with
positive and positive, then negative and positive, then negative
and negative, then positive and negative. You don't have to worry
about which pairs of wires go with which winding. Just hook all
four up to the digital outputs. 5. A stepping motor with five wires
has four windings and is unipolar. One of the wires is a common
connection for all four windings. It will have the same resistance
to the other four wires. Connect that wire to ground and the other
four to the digital outputs. 6. A stepping motor with six wires has
four windings and is unipolar. One of the wires is a common
connection for two of the windings, and the other for the other. It
will have an equal resistance measurement to two other wires, and
infinite resistance to the other three. Connect both common
connections to ground, and the other four to the digital outputs.
Once you have the motor connected, you will need to drive it with
the correct sequence. Fortunately you can't hurt the motor by
giving it the wrong sequence. It will just flail around helplessly.
In the program below, the sequence is set by "order". It lists the
digital output numbers in the order of the windings. Keep trying
orders until the motor
continuously turns in a circle. Note that the software requires
the last of five be the same as the first. Uses an extra entry to
keep the code clean. Run the program like this. Servo.py emits the
OSC commands in the proper order and schedule. sendOSC hands them
off to the Makezine controller. ./servo.py | (trap ""
SIGINT;osc/sendOSC/sendOSC -h 192.168.0.200 10000)
#!/usr/bin/python """servo.py -- runs the servo around and
around""" import time, sys # set this to if True: service = command
= order = [ else: service = command = order = [ false to see the
LEDs light up like the windings are energized. "digitalout" "value"
4,5,6,7,4 ] "appled" "state" 0,1,2,3,0 ]
set = "/%(service)s/%%s/%(command)s " % locals() set0 = set +
"0\n" set1 = set + "1\n" + set + "1\n" set2 = set + "0\n" + set +
"1\n" pausetime = 0.05 def run(): for i in range(0,4):
sys.stdout.write(set1 % (order[i], order[i+1])) sys.stdout.flush()
time.sleep(pausetime) sys.stdout.write(set2 % (order[i],
order[i+1])) sys.stdout.flush() time.sleep(pausetime) try: while
True: run() except KeyboardInterrupt: for i in range(0,4):
sys.stdout.write(set0 % (order[i])) sys.stdout.flush()
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reusing a floppy disk stepper motorCreated by Russ Nelson.
View as slideshow(New window )
The Makezine Controller can easily drive a floppy disk head
positioning stepper motor.8 photos | Detail view 2 commentsPhotos
are from between 14 Oct 06 & 16 Oct 06.
Russ Nelson's photos All Russ Nelson's setsThis set has been
viewed 470 times.
FGC20063 photos
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fd1
Uploaded on October 16, 2006 by Russ Nelson
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reusing a floppy disk stepper motor (Set)
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Tagsmakezinecontroller floppy disassembly
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Taken with a Kyocera Finecam SL400R. More properties Taken on
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A typical 5.25 floppy disk drive
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fd2
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reusing a floppy disk stepper motor (Set)
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Tagsmakezinecontroller floppy disassembly
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Taken with a Kyocera Finecam SL400R. More properties Taken on
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remove the screws that hold the bits on
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fd3
Uploaded on October 16, 2006 by Russ Nelson
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reusing a floppy disk stepper motor (Set)
8
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carefully remove sheet metal (may have punched edges which are
as sharp as a razor)
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fd4
Uploaded on October 16, 2006 by Russ Nelson
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reusing a floppy disk stepper motor (Set)
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You may need to pull friction-fit parts off, e.g. the door close
lever.
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fd5
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reusing a floppy disk stepper motor (Set)
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Carefully separate out reusable parts like optical sensors, LED
boards, and switches.
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fd6
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reusing a floppy disk stepper motor (Set)
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There may be cables attached underneath a board. If they have
connectors, pull them out. If not, clip them close to the
connector.This photo has notes. Move your mouse over the photo to
see them.
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usefulparts
Uploaded on October 16, 2006 by Russ Nelson
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reusing a floppy disk stepper motor (Set)
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This drive has a number of useful parts. See the notes for
identifcation of the parts.
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them.
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stepper-with-controller
Uploaded on October 16, 2006 by Russ Nelson
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reusing a floppy disk stepper motor (Set)
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Tagsmakezinecontroller floppy disassembly
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Taken with a Kyocera Finecam SL400R. More properties Taken on
October 16, 2006 Viewed 121 times
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This stepper uses uni-polar windings. The white wire is the
center tap. The windings are yellow, orange, red, and brown, so I
connected them to digitalout 4 through 7.
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