Bedini Ferris Wheel Regauging Motor

[minoly]

Good, Just wanted to be sure about that. There was a lot of stuff back there about the hall magnets and switching.

Got the new wheel almost finished, Going to go get some glue and materials so it will be a few hours. But I think I am going to like this one much better.

I will go back and review the posts, I know this is all in there somewhere. And I remember going through it thouroughly. There was some debate as to whether the magnets created a turtle shell looking field or if it was re-aligned like a pie shape. I also recall that it was pretty much just like setting the dwell on a car (I did a lot of that back then...). The timing marks were lines pointing toward the center of rotation. To me that meant that they got finer toward the center and wider to the outside. I would intrepret that as meaning you were able to adjust the duration by moving in and out and the location on relation to the coils by rotating right or left.

I will go back and review in case I am missing something.
Les

Les,
this is the quote that sticks in my mind:
"it's the overlapping of the switching that is important in the dwell angle. This is equivalent to a car distributor and it better be set right."

http://www.energeticforum.com/renewa...tml#post117756

Patrick

[John_K]

Timing, timing, timing

Patrick,

Yes, that is right. Very important.

This is the picture that should give you the answer. Note the timing marks.

http://www.energeticforum.com/renewa...tml#post117799


John K.

Les,
this is the quote that sticks in my mind:
"it's the overlapping of the switching that is important in the dwell angle. This is equivalent to a car distributor and it better be set right."

http://www.energeticforum.com/renewa...tml#post117756

Patrick

[Les_K]

Patrick,

Yes, that is right. Very important.

This is the picture that should give you the answer. Note the timing marks.

http://www.energeticforum.com/renewa...tml#post117799


John K.

Well, The super glue I got for the magnets is taking forever to dry. and I ended up using 3/4". In the meantime I think what you are suggesting John, is that the timing is a 50% duty cycle. I recall JB saying so in one of the videos. But by the look of the timing magnets and the dwell angle it looks really close to 50%. But I can't say I fully understand what he meant by overlapping...

Les

[Les_K]

Oh yes, I forgot this one...
http://www.energeticforum.com/attach...otor-dwell.jpg

Les

[John_K]

You got it!

Les,

You got it man, now just do it.

Over-lapping means he has a bigger window to play in.



John K.

Well, The super glue I got for the magnets is taking forever to dry. and I ended up using 3/4". In the meantime I think what you are suggesting John, is that the timing is a 50% duty cycle. I recall JB saying so in one of the videos. But by the look of the timing magnets and the dwell angle it looks really close to 50%. But I can't say I fully understand what he meant by overlapping...

Les

[Les_K]

ouch!

Ok,

Now I will still get a timing led and we will be able to talk about the off part.

Sorry I wasn't able to respond sooner but I broke off a tooth. So for all JB has discovered, today I think the greatest discovery to mankind is novocaine Aaaahh!

Les

[John_K]

Timing

Ok,

Now I will still get a timing led and we will be able to talk about the off part.

Sorry I wasn't able to respond sooner but I broke off a tooth. So for all JB has discovered, today I think the greatest discovery to mankind is novocaine Aaaahh!

Les

Les, with the hall you can tell when the coil is on or off easily. A LED is not mandatory to look at the timing.


John K.

[Les_K]

I found some glitter stars and mounted them. I can see the timing but the video was real bad. Anyway I can see that it fires just about where the flange of the coil starts and ends just past the flange of the coil on th eother side. This is where the cap seems to dump the fastest. However this is pulling 1.3 amps and dumps at 1.7 seconds and before I made this change It was pulling under an amp and was dumping at 1.2 seconds. So I can't say I have moved in a forward direction as of yet. I'll get a shot of the scope for you...

Les

[John_K]

Timing is just like the SG

I found some glitter stars and mounted them. I can see the timing but the video was real bad. Anyway I can see that it fires just about where the flange of the coil starts and ends just past the flange of the coil on th eother side. This is where the cap seems to dump the fastest. However this is pulling 1.3 amps and dumps at 1.7 seconds and before I made this change It was pulling under an amp and was dumping at 1.2 seconds. So I can't say I have moved in a forward direction as of yet. I'll get a shot of the scope for you...

Les

Les, the timing should be set just like the SG. Where does the transistor fire on the SG and where should it switch off? We've been over this on BM2.

Don't worry about the current draw for now.


John K.

[Les_K]

Les, the timing should be set just like the SG. Where does the transistor fire on the SG and where should it switch off? We've been over this on BM2.

Don't worry about the current draw for now.


John K.

Sorry about that, I said "firing" since everything is inverted we are looking at the off time.
Which on this machine is a little earlier than what you showed in your video.
Bedini Monopole SSG Timing - YouTube

so if you look at yours mine is firing at the edge of the flange where yours is just into the flange. But this should be about right since this is and eight pole machine right? and so I would suppose we are talking about closer to 23 degrees here.

And Yes, I read everything you had to say and appreciated it greatly.
would have commented more but I was heavy into this build.

Les

[Les_K]

Here's a scope shot of the coils. I didn't realize it but I went back and looked at the picture from the conference and this looks identical.

Looking across the coils-2.mp4 - YouTube

Les

[John_K]

Inverted?

Here's a scope shot of the coils. I didn't realize it but I went back and looked at the picture from the conference and this looks identical.

Looking across the coils-2.mp4 - YouTube

Les

Les,

It look slike your scope shot is inverted, but that's OK.

Like the SG the transistor should switch on when the centre of the magnet is just past TDC and then switch off at 23 degrees.


John K.

[Les_K]

John,
Just sent an email with a picture of mine and one from the conference.
There is a dropping off of each signal from the conference but on mine it is almost level with no curvature if that makes sense?

I'll draw a picture of the timing. It is definitely not switching like that.

Les

[Les_K]

I think this is better than a picture John.
Correct timing.mp4 - YouTube

The right side is the 1/8th and the left 1/4 and it rotates counter clockwise. I can set it up to run clockwise by moving the hall. Anyway look forward to any new information and Thanks again

Les

[John_K]

Thanks Les

I think this is better than a picture John.
Correct timing.mp4 - YouTube

The right side is the 1/8th and the left 1/4 and it rotates counter clockwise. I can set it up to run clockwise by moving the hall. Anyway look forward to any new information and Thanks again

Les

Les, thanks for the pictures and video. I would've though you would get the fastest RPM with the way you have it tuned in the video as if I tune the same way with an SG I get the fastest RPM.

Try and tune it to the fastest RPM with 50% duty cycle and show me where the transistor turns on and off.


John K.