Bedini SG

[gmeast]

resistor

The schematic I got from the Bedini SG forum says R2 should be 100 ohms?

Tj

Wow! thanks tj ... 100ohms will be much safer to start with.

Thanks again,

Greg

[theremart]

RE: 10 ohms

The schematic I got from the Bedini SG forum says R2 should be 100 ohms?

Tj

The older schematics had 10 ohms the newer ones have 100 ohms..


That resistor is safety to stop too much energy from feeding into your transistor. for 0 -12V I like 47 ohms, for over that I goto 100 ohms and hi wattage if I am doing multi coils or high amps.

[gmeast]

resistor

The older schematics had 10 ohms the newer ones have 100 ohms..


That resistor is safety to stop too much energy from feeding into your transistor. for 0 -12V I like 47 ohms, for over that I goto 100 ohms and hi wattage if I am doing multi coils or high amps.

Hi thermart,

Thanks for the additional suggestions!

Greg

[Joit]

I think i found today a way to avoide overheating from the Pot from to much Amperage at the Base.
I did take a Choke coil, it is a toroidal Ferrit core with 2 oposite Wires,
where the same Poles face to eachother.
I tied the Wires together at one end, that it becomes one Coil, and put it between Base and Pot.
That way i got 0 Ah 4,xxV at the Base from Transistor, and still can adjust the Frequency.
Wires are about AVG 22 at the choke Coil, and at the Solid State Device about AVG24.
Before, my Pot did buuurn.

[baroutologos]

Axial Ssg

Have anyone built and experimented with an axial magnet possition SSG (instead the radial we know)

I am interested in the findings regarding the mechanical output of the device.. Are they the same? In terms of torque, speed, for same energy consumption.

Regards,
Baroutologos

[tjnlsn255]

Hi Baro,

Check out this very interesting youtube video from Scotty7129.....

YouTube - simple magnet motor

There is not a lot of data but I especially like the fact that he has positioned the magnets so that the motor self starts.......

Hope you like it.....

Tj

[ren]

I think i found today a way to avoide overheating from the Pot from to much Amperage at the Base.
I did take a Choke coil, it is a toroidal Ferrit core with 2 oposite Wires,
where the same Poles face to eachother.
I tied the Wires together at one end, that it becomes one Coil, and put it between Base and Pot.
That way i got 0 Ah 4,xxV at the Base from Transistor, and still can adjust the Frequency.
Wires are about AVG 22 at the choke Coil, and at the Solid State Device about AVG24.
Before, my Pot did buuurn.

Joit you can save your pots by wiring in a larger resistor or small 12v globe in series with the pot. If you use a large resistor get something rated for 1 watt or bigger. It can be a 1 ohm resistor or less even. The important part being its watt rating. A globe will do the same thing, if it is selected correctly. Of course pushing too much current shouldnt be a problem if you have selected the right base resistor to begin with. 10 ohms is fine for a very small coil or to get it up and running, 100 ohms is much better. User Sephiroth (sorry typo?) as well as SMW1998 (Lee?) have shown that an extra inductor in the trigger circuit can have other benefits too. There is also some new stuff out from JB regarding the use of a second inductor in the discharged/radiant spiked section of the circuit. He referrs to it as one of the "nodes".

Baro, I have built an axial unit, and I am currently helping a friend build one as well. His goes pretty well, it has four coils and 6 magnets, two coils that are 180 degrees opposites are out of phase from the other two. So it gets up to a decent speed.

As far as a increase in torque however I can see none. My understanding is that the minimal torque the SG provides comes from the ATTRACTION of magnet to steel/core, and to some extent the flywheel effect once in motion. The motor pulse is so quick and cut off before real current starts to flow, and thus does little in the way of torque. In my eyes it is simply there to void one half of the action, and give us our transients for collection.

Ive been thinking about a larger core, perhaps a square one to match the magnets face. Of course air gaps will play a significant part in torque too. A axial unit will allow for a much closer air gap (unless you have curved magnets to suit your circumference), and thus may make it easier to build.

Regards

[tjnlsn255]

Capacitor across coil?

I recently read an artical that said that putting a capacitor across the coil helps to protect the transistor....

This would kill the valuable spikes, right?

Be happy....

Tj

[baroutologos]

Thanks REN for the reply.

I appreciate that. I plan at making an axial SSG with six magnets (1.2' Diam - N face out) and three coils (2 x 18AWG 150 feet) all in phase run by a standard circuit.

ROtor diameter is about 10'. I expect to reach some 2500 rmp. I believe is possible. Good balance on rotor - it would be alluminum made on lathe - and brand new bearings will help.

In terms of rpm, i do not think radial or axial to have any considerable difference. In fact i believe axial maybe more defficient than radial. Anyway for the needs of my project axial is mandatory there.

So i asked to know, your findings in order to understand what parameters should pay attention to. Thanks again for the insights.

Regards,
Baroutologos

[Mark]

Hi Baroutologos

You stated that your rotor would be 10 feet, did you mean inches? I have built both kinds or rotors and 2500 rpm shouldn't be a problem if your rotor is 10 inches. I would recommend using more wire though.

[Joit]

@ren
Yeah, thats the Way i usual did it, to put a Resistor there.
But lately, i made a simple JT from a Transformator, but the Wires been to big for a 60Ah Batt, and it really smoked the Pot.
At an other Bedini i got a 10Ohm/2W Resistor but its still to less for 1,2 Ah at #24 Wires.

I did take a Chokecoil for the JT like here, the lower left Corner one,

and got less Amperage at the Pot now, i guess about 0,200-0,400.

Well, its just in case, someone wanna build something 'BIG' and wont use a lot Resistors there,
and i think, i still will leave a Resistor there, that i allways stay some above of the Coils with the Resistor there.
I saw, when the Pot is to low, the Source get Hot, in my case it was a Powersupply.
And not sure, how much healthy that for a Batterie is, i guess its a little Short.

[Joit]

This one is the Coil i used, its double layered at a Ferritcore,
what doesnt looks like as a bad Idea.
I did connect it in serie, and in serie to the Pot.

[tjnlsn255]

SG circuit with reed switch instead of trigger coil?

Is there a schematic for the SG circuit using a reed switch instead of a trigger coil?

If not could someone help me figure one out?

Thanks for any and all help.....

Tj

[baroutologos]

Hi Baroutologos

You stated that your rotor would be 10 feet, did you mean inches? I have built both kinds or rotors and 2500 rpm shouldn't be a problem if your rotor is 10 inches. I would recommend using more wire though.

My mistake. I meant inches. i am not accustomed with the US metric system much

So, it will be better 18awg x 2 x 210 ft (70m) i guess.

regards,
Baroutologos

[Mark]

Got my supper pole ssg running on 9ma at 10.3 volts thats less than 0.1 watt. The rotor is only spinning at 930 rpm's though and doesn't have enough power to drive anything. I'm trying to charge a battery on the back end also.