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hands on work | 6 comments (6 topical, editorial)

Re: hands on work (3.00 / 0) (#2)
by ghurd on Thu Apr 10th, 2008 at 12:38:31 PM MST
(User Info)

The 1.4V thing. I'll try.

It still only looses 1.4V. Total.
It looses 1.4V per phase.
With 3 phase star and 12V, it lost 1.4V at the battery.
With 3 phases, Jerry Rigged, each phase lost 1.4V. No matter. The loss is parallel, meaning the 1.4V is there 3 times but next to each other (not in a row).

Silly example, but the best I can compare it to...
I have a 60" long 2x4. All 4 sides measure 60".
I cut 1.4" off one end.
The 2x4 is now 58.6" long.
All 4 sides are 58.6" long.
It did not get 5.6" shorter because it has 4 sides. (1.4 x 4 = 5.6)

Jerry Rig treats each phase as a seperate single phase PMA.
The 1.4V is cut off each side.

Star is measuring things caddy-corner.

Hope that helps.
G-

Re: hands on work (3.00 / 0) (#3)
by blueyonder (windwoodgood at yahoo dot co dot uk) on Thu Apr 10th, 2008 at 05:39:36 PM MST
(User Info)

hi ghurd . i think you must be able to look inside my brain .
explaining it bye the use of 4"x2" is just tremendous . i got it in my head now.
(me thinks).
in other words ghurd i just deduct 1.4 volts and forget about the rest.
in time i will get the 8foot 5 phase 12 volt 10 coil on the go.
so if i only lose 1.4 volt in star that will be great.
it will add to my understanding . it wont make any difference to the gen .
now ghurd i don't want to be awkward . but.
can you explain using the same principle .5 phase. 5 rectifiers .
but using a bit timber with five sides this time.
or do you think im pulling your leg.
are you pulling my leg ? caddy corner?.

so now i can pass on the 1.4 volt thing.
and move on.
Andy i try so hard to get things right. using my eye and hands.
but i cant see what is happening with this type thing. thats why i never bothered with circuit boards etc.

and now a update on the post i done last night .
i ment to say whit-worth but my spelling isent the greatest .
plus i was tired. honest.
i paid £30 british pounds for the 8mm steel plate. i got 2 9" discs.
2 12" discs. it was new plate and a nice bit stuff. but not long ago it would have cost much much less.
the test coils i was running at 330 rpm . thay are what i will use on small twin rotor. 9"
i did that post half asleep .
or was i only half awake.
its a ill wind that dos no good
[ Parent ]

Re: hands on work (3.00 / 0) (#4)
by ghurd on Fri Apr 11th, 2008 at 08:44:43 AM MST
(User Info)

Maybe it's 'catty corner'?

I'll try... But it will be 3 phase to start.
The math is off a little, but this isn't a math lesson.

Star, or "Y", makes voltage. Simple enough.
Each phase is a 2x4. The 2x4s are set up like the 3 blades on a windmill. "Y"
The output voltage is measured from the tip of one 2x4 to the tip of another. That measures more than the length of a single 2x4, but less than the length of 2.

Now the 1.4V (or inches) isn't lost all at once. Cut 0.7V (or inches) off the end of each phase or 2x4.
The output voltage is still measured from tip to tip. The lost voltage is still only 1.4V.

For 5 phase "Y", you just do the same thing, except instead of three 2x4s, use 5.
The problem with five 2x4s, is tip to tip is less than one 2x4. So you measure from #1 to #3. That's the same as #1 to #4. (just like with 3 blades measuring from #1 to #2 is the same as #1 to #3)

For 5 phase Jerry Rigged, it's just like before, except the 2x4 has 5 sides.
I don't think 5 phase Jerry Rigged would be a great idea. That's a lot of coils in a small place. I have a feeling the more standard 3 phase would be easier.

G-

[ Parent ]

Re: hands on work (3.00 / 0) (#5)
by blueyonder (windwoodgood at yahoo dot co dot uk) on Fri Apr 11th, 2008 at 06:59:40 PM MST
(User Info)

thank you ghurd.
i can carry on now with that rectifier thing out the way.
you sure have a way of explaining things. thanks again john.

its a ill wind that dos no good
[ Parent ]

Re: hands on work (3.00 / 0) (#6)
by ghurd on Sat Apr 12th, 2008 at 07:31:39 AM MST
(User Info)

One last thing because you will think of it later.

Jerry Rigged lost 0.7V (or inches) off each end too. But it doesn't matter the way I explained it with a 2x4.
The 2x4 is the same length if one end has 1.4" cut off, or both ends have 0.7" cut off. The 2x4 is still the same length.

Glad it helped.
G-

[ Parent ]

hands on work | 6 comments (6 topical, 0 editorial)

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