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Author Topic: The Ossie motor  (Read 329096 times)

captainpecan

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Re: The Ossie motor
« Reply #30 on: February 04, 2010, 07:11:08 AM »
@ Jimboot,
Did you purchase your coils prewound somewhere, or did you just make a very well crafted coil with perfect inductance as to what Ossie was using?  If you ordered them, could you share where you got them from?

@all,
The reason I ask is that I know where I can order the coils that Ossie is using, but I would much rather order a spool and make many coils.  Problem is, the coils I wound are not right.  They are 20 guage I think, but when I measure them they are 1.4 ohm each.  Ossies I think was .5 ohm each.  So what size wire has anyone here used and got the desired results?  Mine still perform well, but the battery never goes up.  I am also not getting a higher generator voltage than the run voltage which is exactly what my problem is, hince the reason I need more info on the coils.

Also, any details on magnets would be good for other replicators.  That of course is another part of my problem, I need to add more or stronger magnets.  Got that handled though.

Overall, keep the replications coming!  This is great stuff guys.  I'm still tinkering with my orbo replication, but to be honest I just don't get the performance I get with my Ossie motor, or even my regular bedini for that matter.  I really think the Ossie motor is where it is at.  It's easily replicated, and a great project for a beginner in this field.  It's almost easier to get results than the SSG circuit.

I've got some awesome additions to my circuit I will be sharing shortly, but I need to get my coils and magnets right so I can test it before I post it.

captainpecan

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Re: The Ossie motor
« Reply #31 on: February 04, 2010, 07:36:35 AM »
Have tried Ossie but with two coils only.
Seems ok, running for long time; maybe with 4 coils it gets better…
http://www.youtube.com/watch?v=6EZKxu5qTJI

Great work!  There is a problem with the schematic you show in the video though.  I assume it is just a drawing error, but if not, you may want to fix your circuit.  For proper recovery of the collapsing field, and to protect those reed switches, the diodes need to be hooked up on the other side of your reeds.  Check the attached photo to see what I mean.  The way you have it in the schematic, your reeds would be arcing, which is not good for them, and a clue that you are not capturing that bemf. You've probably got it hooked up correctly and just drew it wrong though.  Good work though, nice to see another replication, each one is different with new clues to the puzzle!

Jimboot

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Re: The Ossie motor
« Reply #32 on: February 04, 2010, 07:45:26 AM »
Just got home. OM running at 310RPM 1.21V 67hours running time.

futuristic

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Re: The Ossie motor
« Reply #33 on: February 04, 2010, 07:46:38 AM »
Hi guys.

This is probably one of my happiest days because J.L. Naudin is thanking me on his website for the full-wave rectifier idea. I have been following his work for about 10 years now and I have great respect for him.

@captainpecan:
Ossie and Jimboot are using this coils:
http://www.jaycar.com.au/productView.asp?ID=LF1326

Specifications:
- Inductance: 1.8mH
- (L)DCR: 1.05 Ohms
- Wire Dia: 0.8mm
- Core: Air

I will make coils by myself because there is no way I could wait for the package to get from Australia to Europe. ;D
I also got all the material for Ossie motor so over the weekend I will be able to do some testing.

Frenky

Jimboot

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Re: The Ossie motor
« Reply #34 on: February 04, 2010, 07:54:19 AM »
@captainpecan
I got the serial number from the coils off Ossie's original vid & since he is an Aussie I know he shops at Jaycar. So I got them there. You can also order directly from them here http://jaycar.com.au/productView.asp?ID=LF1326&keywords=lf1326&form=KEYWORD If anyone is going to buy from Jaycar in Frankston ALL the staff there are now familiar and educated in the the Orbo & Ossie MOtor & have seen a working demo of the Ossie. Also some of the staff in the Cheltenham store are now familiar with the principles :D  They currently have a shortage of reed switches tho oops! SPreading the word. Trying to get more replications happening.

Jimboot

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Re: The Ossie motor
« Reply #35 on: February 04, 2010, 08:05:56 AM »
Have tried Ossie but with two coils only.
Seems ok, running for long time; maybe with 4 coils it gets better…
http://www.youtube.com/watch?v=6EZKxu5qTJI
Wow very impressive! Are the blades sitill on that fan? Wouldn't the drag slow it down? Great work.

Jimboot

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Re: The Ossie motor
« Reply #36 on: February 04, 2010, 08:14:58 AM »
Can someone direct me to a resource that explains in principle how to replace a battery with a cap? I need to understand principles etc. Thanks.

futuristic

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Re: The Ossie motor
« Reply #37 on: February 04, 2010, 09:49:46 AM »
Hi.

First you must get a good capacitor. I suggest this one (22 Farad 2.5V Super Capactor):
http://www.jaycar.com.au/productView.asp?ID=RE6704&CATID=51&form=CAT&SUBCATID=861

Then you must charge it. Make circuit of 1.2V battery, 5 Ohm 10W resistor and 55F capacitor in series like in the attached circuit.
Double check the + and - on battery and capacitor.

After 5min the capacitor will be fully charged and you can just replace the battery running the motor with this capacitor.

Have fun ;)
Frenky

P.S.
Some resources:
http://electronics.howstuffworks.com/capacitor.htm
http://hyperphysics.phy-astr.gsu.edu/Hbase/electric/capchg.html

woopy

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Re: The Ossie motor
« Reply #38 on: February 04, 2010, 10:26:45 AM »
good morning all

@ Gyula

thanks very much for deep explanation . I am at a good school here.

Here enclosed the current test with a 100 ohmn resistor at the entry . The motor spins much slower as expected  and the trace is much better on the scope.

and now the question  what does exactly shows this trace ??  pulse output from battery or pulsed input to the battery       is it showing the voltage or only the image of the current ??

@ Futuristic

Hehe Frenky you are a celebrity now      well done      and thanks for sharing

@ Jb

Futuristic made a good explanation for the supercap
here a picture how i hooked my 2 x  10 F 2.7 volt supercap in serie to get 5.4 volt nominal  because i use a 4.5 volt battery. If your battery is 1.5 volt you need only one.

I don't know if 10 F supercap is perhaps too small capacity because the tests i made with them are not very impressive . I can notice a slowing of the motor after some minutes already. Is there perhaps too much resistance in this small supercap ??  Any idea ?

i am still waiting my schottkys

regards

Laurent




futuristic

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Re: The Ossie motor
« Reply #39 on: February 04, 2010, 10:43:06 AM »
Voltage on the capacitor is dropping exponentially with time: http://hyperphysics.phy-astr.gsu.edu/HBASE/electric/imgele/capdis.gif

So if you don't recharge capacitor effectively the motor will quickly slow down due to weaker and weaker field B of the air coil.
This test should probably be done when you are positive that current going back into power supply (battery, capacitor) is bigger than current going out.

Frenky

Jimboot

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Re: The Ossie motor
« Reply #40 on: February 04, 2010, 12:38:06 PM »
I accidentally dropped a small mag close to my motor. DOH! It has locked onto the rotor somewhere and slowed revs to 200. voltage initially dropped to 1.20 and now is bouncing between 1.21 & 1.20 I am now seeing some the trough pulses without the artefact I saw in earlier post. Now seems stable back at 1.21. What are these bumps?

futuristic

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Re: The Ossie motor
« Reply #41 on: February 04, 2010, 09:40:28 PM »
You probably have some wire too near to the rotor.

Magluvin

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Re: The Ossie motor
« Reply #42 on: February 04, 2010, 10:13:26 PM »
Maybe the lil bumps are that small magnet on the rotor


Mags

gyulasun

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Re: The Ossie motor
« Reply #43 on: February 04, 2010, 11:02:32 PM »
...
The reason I ask is that I know where I can order the coils that Ossie is using, but I would much rather order a spool and make many coils.  Problem is, the coils I wound are not right.  They are 20 guage I think, but when I measure them they are 1.4 ohm each.  Ossies I think was .5 ohm each.  So what size wire has anyone here used and got the desired results?
....

Hi,

Here is a link that allowes a good insight into multilayer air core coil winding details. http://www.colomar.com/Shavano/inductor_info.html

If you enter the 1.8mH (Ossie coil from Jaycar) in the inductor window and click on Generate Results, a lot of useful data will appear in a new window, showing different wire diameters that will all give 1.8mH, with the included geometry for each wire size.
It calculates the coil from Jaycar pretty close: see the 0.84mm wire diameter that gives 0.98 Ohm DC resistance (Jaycar coil has 1.05 Ohm from the 0.8mm wire).  (Thanks to Futuristic for writing the Jaycar coil data.)

With this online air core coil calculator you can figure out very quickly the coil sizes for any needed self inductance, getting wire diameter, length, DC resistance etc.

rgds, Gyula

futuristic

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Re: The Ossie motor
« Reply #44 on: February 04, 2010, 11:11:07 PM »
I'm using similar online calculator for air core coils: http://www.pronine.ca/multind.htm

Frenky