Bedini Ferris Wheel Regauging Motor

[woopy]

back emf versus flyback spike in relation with speed

Hi all

i made some experience those last days

i am not sure to be at the right place but anyway i try

i hope this helps and if you are interested it is onother video on part 5 of my videos chanel

good luck at all

Laurent



YouTube - part 6 back emf versus flyback spike

[LutherG]

Hi txaggie00,

I'm building the same size wheel using the same size magnets (see John - I told you I'd build it! and have pm'd you with a couple of questions and a phone number... I look forward to talking to you.

thanks,

Luther

[txaggie00]

6 Foot Acrylic 3GT

Hello All!

First time poster, long time lurker. Went to the conference in Nov and was blown away. I am anxious for July, but have a lot to do before then. I have thoroughly enjoyed this thread and am learning a lot. My friend, Brent, and I have started engineering our mini BFW and I just had a few questions. We are finishing up some CAD work on the wheel design and wanted to incorporate the magnet placement for the Halls timing onto the one of the main wheels. We are unsure about the dwell arc for the timing. It's a 6 foot wheel and have designed three different diameters for the timing magnets placement: 10", 12" and 14". The magnets we are going to use are about .78" in diameter

@ John Bedini
Is there a certain size ratio or is the dwell arc dependent on the rest of the system?

Just wanted to see if I could get any clarity before we send the acrylic to get cut. I guess if it isn't perfect, we can always add a separate timing wheel to the shaft. We are eager to "just build it"!

Thanks,
Scott

Edit: I have added a picture which includes two more diameters for the timing magnets. The picture shows the diameters for the timing magnets and their corresponding "dwell arc" distance between each magnet (all measurements are in inches). Obviously, I don't want to lose any structural integrity on the wheel, so I would prefer not to machine all of these. Based on the picture, is there any diameter which could be preferable to another?

[Sawt2]

Brian,

It has been posetd in this thread several times. Check the first few pages.


John K.

Thank you John
Somehow I missed those
Would the MJL21194 &93 work for the circuit instead of the MJE's?
Brian

[Les_K]

Les_K,
According to my notes, the center coil has the core protruding through the plate into the wood two inches on John's big machine. Hope that helps.

Ok, Back to the shop...


Thanks
Les

[Mark]

Les_K,
According to my notes, the center coil has the core protruding through the plate into the wood two inches on John's big machine. Hope that helps.

South hemiphere core sticks up through top and north hemisphere core sticks out through bottom.

[Turion]

Les_K,
According to my notes, the center coil has the core protruding through the plate into the wood two inches on John's big machine. Hope that helps.



"All truths are easy to understand once they are discovered; the point is to discover them." Galileo Galilei

[Les_K]

Hi Folks,

I have my setup running on a hall triggered Bedini/Cole circuit now as well as cap pulsing.

It's running well but I didn't get time to buy some zeners for the SCR today, so I'm using 4 x 1N4004's in series with the 2 x 2.8V super bright LEDs.

It is going way too fast, about 50 RPM so I think I need to reduce the dwell time on the halls some more. (Thanks again to Ren for the halls!)

It's charging the heck out of the secondary battery and the run battery also appears to be gaining a bit. But I've been tricked by these crap gel-cells before so I'm not reading too much into that.

Here's a short (low quality) YouTube video YouTube - Bedini S1GT

Thanks John B for all your tips, it works just like you said it would


John K.

Awesome John K,
I am curious about your coil. I thought only the two outside coils had the core(Welding rods) protruding and the center was not. Did I miss something?
I got my center coil made, just wondering if I did it wrong.


Les

[Mark]

Hello John K

What is your trigger transistor, couldn't here you in the video sounded like 2N2055. I've been using the MPSA06, is there much difference?

Thanks, Mark

[Bit's-n-Bytes]

Hi Folks,

I have my setup running on a hall triggered Bedini/Cole circuit now as well as cap pulsing.

It's running well but I didn't get time to buy some zeners for the SCR today, so I'm using 4 x 1N4004's in series with the 2 x 2.8V super bright LEDs.

It is going way too fast, about 50 RPM so I think I need to reduce the dwell time on the halls some more. (Thanks again to Ren for the halls!)

It's charging the heck out of the secondary battery and the run battery also appears to be gaining a bit. But I've been tricked by these crap gel-cells before so I'm not reading too much into that.

Here's a short (low quality) YouTube video YouTube - Bedini S1GT

Thanks John B for all your tips, it works just like you said it would


John K.

Great Job John K.

Jeff

[John_K]

JK's Bedini GT1

Hi Folks,

I have my setup running on a hall triggered Bedini/Cole circuit now as well as cap pulsing.

It's running well but I didn't get time to buy some zeners for the SCR today, so I'm using 4 x 1N4004's in series with the 2 x 2.8V super bright LEDs.

It is going way too fast, about 50 RPM so I think I need to reduce the dwell time on the halls some more. (Thanks again to Ren for the halls!)

It's charging the heck out of the secondary battery and the run battery also appears to be gaining a bit. But I've been tricked by these crap gel-cells before so I'm not reading too much into that.

Here's a short (low quality) YouTube video YouTube - Bedini S1GT

Thanks John B for all your tips, it works just like you said it would


John K.

[redrichie]

one more view.

[redrichie]

PMH motor. Had best run speed/torque with magnets in this position. Cant wait to try it on bp switch. runs at about 50-60 rpms. draws 10-20mA using just a modified relay as a switch for now. metal plate is a flywheel from a copier. good bearings.

[John_K]

Turion
I just get the feeling that if we build the setup as John told us, with all the windings in parallel, the 2 slave coil resistances half that of the master coil and with the coil magnet offsets as Jerdee showed the self biasing of the mag amp from the pulse will happen automatic.
If the 2 mag amp windings were to be dc biased seperate , John would have told us and they would not be in parallel with the other windings.
Vissie

Hi Vissie,

I was just thinking the same thing - how do we get the mag amp to work? The way I see it is that if all the coils are in parallel, then the Bedini/Coil switch will "short" the thinner wires when the transistors switch on. Would this not bias the coil? When the transistors switch off the thinner windings are now "open" so the inductance changes?

Am I on the right train?


John K.

[nvisser]

Turion
I just get the feeling that if we build the setup as John told us, with all the windings in parallel, the 2 slave coil resistances half that of the master coil and with the coil magnet offsets as Jerdee showed the self biasing of the mag amp from the pulse will happen automatic.
If the 2 mag amp windings were to be dc biased seperate , John would have told us and they would not be in parallel with the other windings.
Vissie