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Author Topic: Dia. Mag. Alternator  (Read 190945 times)

nievesoliveras

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Re: Dia. Mag. Alternator
« Reply #120 on: November 15, 2010, 04:41:30 PM »
Good luck my friend!

Jesus

z.monkey

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Re: Dia. Mag. Alternator
« Reply #121 on: November 17, 2010, 12:40:53 PM »
Good luck my friend!
Thanks Jesus...

Got the new coils wound...

NineClaw

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Re: Dia. Mag. Alternator
« Reply #122 on: November 17, 2010, 05:59:57 PM »
Here's to hoping we don't ever have to take the new coil off...

z.monkey

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Re: Dia. Mag. Alternator
« Reply #123 on: November 17, 2010, 06:07:20 PM »
Yeah, that one is a bit difficult to replace...

z.monkey

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Re: Dia. Mag. Alternator
« Reply #124 on: November 18, 2010, 03:20:11 AM »
Gotta a 'lil mo meat in there this time...

nievesoliveras

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Re: Dia. Mag. Alternator
« Reply #125 on: November 18, 2010, 03:52:58 AM »
Those coils seem configured as a Joule thief coil. With a center tap.

z.monkey

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Re: Dia. Mag. Alternator
« Reply #126 on: November 19, 2010, 01:57:33 PM »
The new windings are producing 0.73 Volts open circuit.  A little lower than expected.  Looks like I chose wire that is a bit bigger than what I needed.  Mark had suggested that I use a step up transformer in this situation.  So I have a 10:1 step down transformer that I hooked up backwards to make it step up.  The open circuit output from the transformer is 9.5 Volts.  When I add the 65 Ohm resistor the voltage drops to 2.94 Volts, which is 45 milliAmps, and about 1/8 of a watt.  Testing with the same drill, 1400 RPM, 23 Hertz.

So, that was a step in the wrong direction...

Anyway, kind of at an impasse here.  I'll let it fester in my subconscious for a while and see what gets regurgitated in a couple of days...

Got to get ready for Thanksgiving in the meantime...

nievesoliveras

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Re: Dia. Mag. Alternator
« Reply #127 on: November 19, 2010, 02:32:09 PM »
Just for experimenting you can attach a joule thief circuit to the coils as they are now and see how much voltage you get out.

I think you know this already. Just in case the center tap of the two coils go to the positive and the other wires one goes to the transistor base through a resistor and the other to the transistor colector.

Jesus

wattsup

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Re: Dia. Mag. Alternator
« Reply #128 on: November 19, 2010, 02:43:43 PM »
Hi @Z

Always good to see your works. Great workmanship.

Maybe a few points to consider.

@MK showed you a microwave oven fan motor. Those motors work because there is a slit cut into the lamination so it will work with AC. Also they have a rotor that has angled laminations to keep the rotation going.

The other thing is those bolts you are using to hold your laminations together. If they are steel, then then can play havoc on flux movement. Maybe look for some aluminum bolts. But it seems that there are many bolts that are very bulky. Imagine flux is bouncing off those bolts.

Last thing is the coil wires coming out to only three terminals where you have two soldered together. You are better to use 4 terminals then you can play with the wiring in different ways for your tests. Series, parallel, opposing, etc.

z.monkey

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Re: Dia. Mag. Alternator
« Reply #129 on: November 19, 2010, 03:53:52 PM »
Jesus, I hadn't thought about using the JT in conjunction with the DiaMag6.  I need to explore the JT first.  What are the part numbers for the diode and transistor?

Wattsup, I have of set of brass bolts (non-ferrous) and can swap those in there.  But the brass is soft compared to the steel, and the bolts get chewed up when I put them in and take them out.  There is a pile of brass filings under the thing every time I move them.  I feel like the steel bolts are OK because this is not a signal transformer.  Eddy currents cause performance issues in signal transformers, but here the magnets are telling everybody what to do.  I have spent a lot of time contemplating my mag field issues, and probably have more work to do there.  Also the windings are wound to be in series, and that is why they are connected in the middle.

About the poor electrical performance, which is mag field related, there is something I forgot to add.  If you look at the raw core, we have two E cores back to back.  The "I"'s are missing, like an EI core.  The reason EI cores are efficient is they have a complete flux path around the coils.  In the case of the DiaMag6 core the flux return pathways (I's) are missing.  That would reduce efficiency and overall performance.  I think I can make something with some bar stock to fill that gap...

Thanks for the helps, Y'all...

nievesoliveras

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Re: Dia. Mag. Alternator
« Reply #130 on: November 19, 2010, 08:09:37 PM »
The diode that its used most is the 1n4007.
One of the best transistor I have used is the Tip3055.
The resistor depends on what battery you use. A pot is recommended here.

PS
At the diode and the extra wire comming from the emitter is where you have the output Dc voltage.

Jesus

z.monkey

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Re: Dia. Mag. Alternator
« Reply #131 on: November 20, 2010, 02:13:23 PM »
The diode that its used most is the 1n4007.
One of the best transistor I have used is the Tip3055.
Teh Joule Thief is what I call a boost converter.  Its an oscillating circuit that pumps up the voltage of a battery source.  I don't think using the DiaMag6 coils as the timing circuit inductor is the right way to apply this.  Use the DiaMag6 as the battery source.  Rectify and Filter the AC to DC.  Then apply it to teh Joule Thief.  This way teh Joule Thief retains its Bifilar inductor which is part of its timing circuit.

The operation of teh Joule Thief is dependent on the LRC timing circuit which is half of the Bifilar inductor, the resistor, and the capacitance (and threshold) of the gate on the 2N3055.  The voltage charges up the gate until it crosses the threshold, and then the transistor turns on and dumps current into the other side of the Bifilar winding.  This creates an output pulse, and resets the timing circuit simultaneously.  It is boosting voltage at the sacrifice of current.  The output power is probably a little less, but it makes batteries last longer because you are Pulse Width Modulating the output, and don't have a continuous drain on the battery.

So, yeah, it will increase the output voltage...

Edit:  Forgot to mention that the pulses coming out of the Bifilar winding will be very fast transients.  The 1N4007 diode is not nearly fast enough to catch these pulses.  Try using a Schottky Diode, ultrafast diode, 1N5817.  The waveform produced when the 2N3055 turns on and off is a square wave.  Square waves produce extremely high frequency harmonics, and if your diode is fast enough you can catch them.  Some peeps think this is ZPE...

nievesoliveras

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Re: Dia. Mag. Alternator
« Reply #132 on: November 20, 2010, 02:48:58 PM »
Thank you @zmonkey for the explanation and the addition of the new better diode to the circuit.

Jesus

z.monkey

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Re: Dia. Mag. Alternator
« Reply #133 on: November 21, 2010, 02:31:36 AM »
Hey Jesus,

I revised the circuit a little to make it more descriptive...

nievesoliveras

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Re: Dia. Mag. Alternator
« Reply #134 on: November 21, 2010, 11:09:44 AM »
Thank you @zmonkey!

Jesus