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a vawt spining a hd motor?


By electrondady1, Section Homebrewed Electricity
Posted on Thu Aug 24, 2006 at 05:15:04 PM MST
i get  voltage when i ...

after collecting harddrives for the magnets i find my self in possesion of more than 100 little motors. i just put my meter on the terminals and found i can get conductivity between all four leads ???  
and there is a smalll voltage reading when i hand spin . and two different resistance readings
is there a wireing configuration that would maximise the output?

here's what i'm thinking

 you may recall ed lenz's posting on a popcorn generator and a more recent one entitled "tumbleing magnet generator scale it up".
basicly the flux from mag rotor was used to rotate a second mag and induce a voltage in a coil placed between them .
the second magnet rotated a 1/2 turn for every pole and it resulted in some very fast rotations on the secondary  mag./ even at modest rotor speeds
i glued a magnet on a harddrive platform and it worked.
so next i'm thinking , instead of turning a coil and support mechanism just spin the hard drive motor itself ???
  the  conductivity between four leads from the motor has me puzzled ??
a vawt spining a hd motor? | 6 comments (6 topical)

Re: a vawt spining a hd motor? (3.00 / 0) (#1)
by ghurd on Thu Aug 24, 2006 at 12:54:01 PM MST

It is 3-ph star or Y or wye.
The 4th wire is common to all coils and has the lowest ohms (X) to any other wire.
Output wires will have 2X ohms to each other.
Ignore the common lead. Disconnect any circuits connected to the outputs.
Output will be very low. VERY low.  And it'll need speed.
But it works and it is fun to play with.

Did you see my VCR and ruler blade windmill?  Same thing, bigger alt. Same principles.
http://www.fieldlines.com/story/2005/11/25/204242/17

Fun stuff!
G-
Ghurd.info



Re: a vawt spining a hd motor? (3.00 / 0) (#2)
by electrondady1 on Thu Aug 24, 2006 at 01:55:50 PM MST

gurd,
thanks a lot, i will read you post afew times to get all the info.
hows this for speed. a 16 pole disk brake mag rotor , just laid it on a hard drive motor and disk to act like a hub.spun it by a finger up to maybe 200 rpm(a guess) what a bearing!(dam thing will turn all day).
so it's 16x200x1/2=1600rpm to the harddrive motor
used the two leads with the greatest resistance(i guess that would be two phases) and got 1.2  open volts on the meter.
i'm amazed at how fast the thing spins and with no physical connection.
one draw back, if for whatever reason the flux connection is brocken so the two mags are spining a different speeds . it's almost impossible to sinc. them up again unless you bring it to a complete stop.
i'm going back to the shop to play with this somemore .

[ Parent ]


Re: a vawt spining a hd motor? (3.00 / 0) (#3)
by ghurd on Thu Aug 24, 2006 at 03:02:40 PM MST

I really didn't get Ed's statement about becomeing 'disconnected' was it?
Still don't get how they turn at a different RPM.

The 1600RPMs is fast!
Still, I was being polite before. Scrap the HD motor for the 2 cents each in Cu.
Find a junk VCR.  Call a repair shop and offer $3?
HDs cant make the volts for LEDs, and that's when I quit, so I won't guess on the amps.

I'm hunting for these 'DLT Tape Drive' do-hickies. No luck. Cha-Ching $!
Looks like a serious step up, better suited to a wind machine.
MAYBE enough space for HD neos to replace the factory magnet disk?
http://www.fieldlines.com/story/2006/8/8/222021/1354

Its fun when it doesn't work, but more fun when it does.
G-
Ghurd.info
[ Parent ]



Re: a vawt spining a hd motor? (3.00 / 0) (#4)
by electrondady1 on Thu Aug 24, 2006 at 04:12:04 PM MST

well, i tried it with a 14" rotor, 32 ceramic magnet poles
spun it as fast as before maybe 200 rpm.
32x200x1/2=3200 rpm
the little harddrive motor makes a funny sound
and spits out 2.5 volts !!

[ Parent ]


Re: a vawt spining a hd motor? (3.00 / 0) (#5)
by windstuffnow on Thu Aug 24, 2006 at 05:07:15 PM MST

  Isn't that neat how that works? It's like an unconnected gear/belt drive.   When I was designing a pressurized stirling engine and built a magnetic drive system for it with a plastic housing I realized it could be used as a simple transmission without a direct connection.

  Unfortunately, when it slips it will not reconnect while under a load until it stops or at very low rpms.  Since it's indirectly connected, using it as a re-drive, your limited to the amount of torque you can give it depending on the magnetic area, strength of the magnets and air gap between the magnets.

  It would be an interesting test to measure the input and output to find the actual efficiency of the drive.  I'd bet it's pretty high although the break away may steal some power from it.  

  Glad to see someone's having fun with it!

.

 
Have Fun! Windstuff Ed
[ Parent ]



Re: a vawt spining a hd motor? (3.00 / 0) (#6)
by electrondady1 on Thu Aug 24, 2006 at 06:46:11 PM MST

3 volts ! that's enough for now.
i'm getting a sore finger from spining the darn thing! lol
the slippage is a problem.
i think the faster it goes the more tendancy it has to break away
i noticed a difference with the ceramics mags(weaker conection)
best if you had slow acceleration, a very steady rotation and tight clearances .
the load would need to be dialed in and constant.
the size and spacing of the mags needs to be a good match to each other.
the harddrive motor might not be a good generator but it works well as a platform/bearing.
maybe a purpose built coil next.

[ Parent ]


a vawt spining a hd motor? | 6 comments (6 topical)
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