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Author Topic: Deepcut's Experiments.  (Read 27599 times)

Offline DeepCut

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Re: Deepcut's Experiments.
« Reply #15 on: November 21, 2011, 07:39:30 PM »
Thanks, i've found the answer. There is no differencfe in voltage-polarity or current-direction, N and S poles do the same thing.

What creates AC is the magnetic field etnering the coil, and the field exiting the coil, because it's cutting the wire in the opposite direction.
Experience is a hard teacher, it gives the test first and the lesson afterward.

Offline DeepCut

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OU ! ?
« Reply #16 on: December 07, 2011, 08:05:59 PM »
I found out that what i was told about AC was wrong, i did my own experiments to find out that a North pole entering/exiting a coil gives an OPPOSITE voltage-polarity/current-direction change to a South pole.

I now have a multi-magnet rotor, driven by a DC electric motor.

Input power is 6.3 VDC @ 520 mA = 3.276 Watts.

Output power (with two coils in series) is 325 VDC @ 12 mA = 3.9 Watts.

Output power (with three coils) is 450 VDC @ 12mA = 5.4 Watts.

I want to self-run it but i don't have the right transformer to do so.

Does anyone know a good way of stepping down voltage ?

Does the fact that my frequency is ~ 600 Hz make a problem ?

I am in unknown (to me) territory now ...


Cheers,

Gary.

Experience is a hard teacher, it gives the test first and the lesson afterward.


Offline free_nrg

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Re: Deepcut's Experiments.
« Reply #17 on: December 08, 2011, 01:00:37 AM »
You could take a microwave transformer, take the primary off and wind your own for the voltage you need. Of course that winding will then be the secondary. It wont take many turns. I made one before to put out 12v. I think it was under twenty turns.  Just use insulated wire so it doesn't get nicked up feeding it through the core. Not the easiest to wind but for the few turns you need,  shouldn't be too bad.


Offline M.E

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Re: OU ! ?
« Reply #18 on: December 08, 2011, 07:01:48 AM »
I found out that what i was told about AC was wrong, i did my own experiments to find out that a North pole entering/exiting a coil gives an OPPOSITE voltage-polarity/current-direction change to a South pole.

I now have a multi-magnet rotor, driven by a DC electric motor.

Input power is 6.3 VDC @ 520 mA = 3.276 Watts.

Output power (with two coils in series) is 325 VDC @ 12 mA = 3.9 Watts.

Output power (with three coils) is 450 VDC @ 12mA = 5.4 Watts.

I want to self-run it but i don't have the right transformer to do so.

Does anyone know a good way of stepping down voltage ?

Does the fact that my frequency is ~ 600 Hz make a problem ?

I am in unknown (to me) territory now ...


Cheers,

Gary.

Hi Deepcut,

Your result is great. congratulation !, have you tried with adding some more pick up coils. will the input remain not increase ?

Rgds,

M.E

Offline DeepCut

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Re: Deepcut's Experiments.
« Reply #19 on: December 08, 2011, 01:53:43 PM »
I've been testing the new setup, with occasional pauses for sleep and food ;+}

It seems that it generates more power than it uses but i will have to wait until i get a scope (new year).

Here's a vid :




Thanks for reading,

DC.

Experience is a hard teacher, it gives the test first and the lesson afterward.

Offline thaelin

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Re: Deepcut's Experiments.
« Reply #20 on: December 08, 2011, 05:31:08 PM »
Hi DC:
   Thay here, I just had a thought that may help you
down convert your voltage. First it may be necessary
to rewind your coils (Ghasp). But if done, half them by
doubleing the wire to make it put out around 220 volts
with possibly double the MA.
   Since you are what sounds like UK, a SMPS that puts
out say 18 volts for a laptop could then use a variable
voltage regulator to feed the motor with. Not to mention
having access to the 18v for other stuff as well. ???

I remember feeding a power supply for an old pc from a
bedini and it actually did output power. Only 10v on the
12v side but it did do it. Just had to connect it to the cap
inside to make it work.

Something to think about.

T

Offline Romero

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Re: Deepcut's Experiments.
« Reply #21 on: December 08, 2011, 05:56:37 PM »
Hi DC:
   Thay here, I just had a thought that may help you
down convert your voltage. First it may be necessary
to rewind your coils (Ghasp). But if done, half them by
doubleing the wire to make it put out around 220 volts
with possibly double the MA.
   Since you are what sounds like UK, a SMPS that puts
out say 18 volts for a laptop could then use a variable
voltage regulator to feed the motor with. Not to mention
having access to the 18v for other stuff as well. ???

I remember feeding a power supply for an old pc from a
bedini and it actually did output power. Only 10v on the
12v side but it did do it. Just had to connect it to the cap
inside to make it work.

Something to think about.

T
Hi  thaelin,

 This is exactly what I sugested yesterday to deepcut  :)
Don't need to open the psu to connect to the internal capacitor, it works just fine applying dc at the ac terminals, I have used it myself with a computer psu  and laptop charger and worked very well.
I am not very sure about the amps from deepcut generator, maybe too small. Better lower voltage and a bit more amps. These power supply are working good from as low as 100volt imput and up to 150volt.

Regards,
Romero

Offline thaelin

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Re: Deepcut's Experiments.
« Reply #22 on: December 08, 2011, 08:13:42 PM »
   A bit more on this. I have been snapping up a bunch
of the laptop supplies and such. These are just great
for this purpose. I can use them directly off a gen set
that puts out say 200v.  I remember hektor saying to
grab them while they last cause as soon as they figure
out what we are doing with them, that will change.

When ever I get a day off again, I have a lot of coils to
wind and then a good run or two. My laser cut frame
turned out perfect so I can work with it. More later as
I can.

DC, keep up the great work. That is how we progress.

thay

Offline DeepCut

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Re: Deepcut's Experiments.
« Reply #23 on: December 10, 2011, 04:35:32 PM »
Thanks Thay and Romero.

Unforunately the coils don't exhibit the AUL effect very strongly.

I tried a small coil (50 grammes instead of 500 grammes) the other day and the effect was HUGE.

The wire is an unknown gauge but i think it's maybe 0.3mm, my digital calipers should arrive on Monday then i will know what gauge the wire is because the performance was very impressive, rotor speed rose by about 100 Hz and current draw dropped by about 100 mA.

I sacrificed one of the big coils today to wind smaller coils with it but the resistance of 0.25mm wire is too high so that was a waste of time.

I think i will now go Muller style with small coils because it's costing too much money buying kilos of wire and it's all the same effect being put to use ...

Onward and upward !

Experience is a hard teacher, it gives the test first and the lesson afterward.

Offline DeepCut

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Re: Deepcut's Experiments.
« Reply #24 on: December 15, 2011, 03:59:16 PM »
Small coils work very well.

I've ordered another kilo of 0.3mm wire, some more laminations for the cores as well as new endplates so that i can use smaller bearings and get even higher frequencies.

Should be ready for testing in 6 or 7 days.


Cheers,

DC.

Experience is a hard teacher, it gives the test first and the lesson afterward.

Offline DeepCut

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Re: Deepcut's Experiments.
« Reply #25 on: December 19, 2011, 07:38:15 PM »
Looking in to ordering a 3D print of my rotor design, then the rotor and shaft are all in one piece and the shaft press-fits into the bearings.

Experience is a hard teacher, it gives the test first and the lesson afterward.

Offline Romero

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Re: Deepcut's Experiments.
« Reply #26 on: December 19, 2011, 10:31:22 PM »
Looking in to ordering a 3D print of my rotor design, then the rotor and shaft are all in one piece and the shaft press-fits into the bearings.
how many magnets on your rotor? can you elaborate a little more...

Offline DeepCut

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Re: Deepcut's Experiments.
« Reply #27 on: December 19, 2011, 10:49:24 PM »
Hi Romero,

The rotor will have holes for 24 magnets.

I'm only using 12 at the moment, going N/S.

It is being driven by a 12v 6w DC motor (brushed) :

&list=UUDz1_S1kOhi9nYZB0KV7znA&index=1&feature=plcp

I've been having accuracy problems with my CNC guy, this means there is a slight rattle where the ebarings meet the holding plates so i have to tighten things vertically so that the holding plate pushes down on the motor and this reduces RPM and tightens the whole movement.

I may not get a rotor 3D printed as i think it may cost ?70 or so, i may just order some accurately-cut sheets and hold the motor in with them, they will be tight enough horizontally and not push down on the rotor.


Cheers,

DC.

Experience is a hard teacher, it gives the test first and the lesson afterward.

Offline DeepCut

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Re: Deepcut's Experiments.
« Reply #28 on: December 19, 2011, 10:53:09 PM »
Attached  is the rotor model in Google Sketchup :

http://sketchup.google.com/intl/en/download/index.html
Experience is a hard teacher, it gives the test first and the lesson afterward.

Offline DeepCut

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Re: Deepcut's Experiments.
« Reply #29 on: December 20, 2011, 04:49:57 PM »
Turns out to be hugely expensive to 3D print as lots of support material would be needed, i've had quotes ranging from 200 to 2,200 pounds !!!

I am trying to do away with threaded brass rod and nuts and washers.

I've just tested an aluminium shaft, which i froze. After freezing it shrinks then i mount the rotor and the bearings and it holds really well after expanding at room temperature.
Experience is a hard teacher, it gives the test first and the lesson afterward.


 

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