hands on work

[blueyonder]

  working on my mill as much as time spares.  what with the other work that needs doing.  

  but as the days get longer and warmer. im sure i will move at a faster speed.

  its a good job im not inventing the wheel .

  the world would be running out of footwear.

  but i get there in the end . slow but sure.   and as i am only learning about electrics . it is a bit more than i can do to understand what its all about.

  as yet i am only learning to talk the talk.  

   i can only talk about what i know and understand.

   so far im getting the bits i need in hand.

  solar panels are much less hard work.  

   but would rather make a wind turbine than try my hand at making panels .

  this is three rotors cut rough for turning.

  one 9" and two 12".

    the turning i will enjoy .  just bought a old lathe that needs a bit TLC.

    for any one interested its a old thing. all the threads are witworth.

    with a 1 5/8" thread on the spindle.  

    just got to make a face plate for it.

     for you folks in the USA getting witworth allen bolts is a pain here.

     must get a few pics of the old lady.

     it may have come from the states in the early forties.(the war effort)

    i have got myself sum pipe and tubes for the tower or mast.

     trying to work out how much concrete i will need and whare to put it yet.

    other things i have been doing are playing with coils.

    taken the other mill apart and yousing the single rotor for testing.

    very happy with what im doing .

   the testing of a single coil was fun so thought i can try two.

  testing the AC is good .but with the rectifier in line for DC . i lose a bit voltage.   its two coils so one phase.  i understand this would be called jerry rigged.

  but with three phase star connected .it will still have three rectifiers .

  am i right in understanding if it was jerry rigged .i would lose 1.4 vots three times ?

  and with star only lose 1.4 volt.

   and dos the name jerry rigged come from jerry on this site.

  or is there another reason its called that.

   i would like to ask a question please.

   testing  with a single rotor and testing with a double rotor.

   will i have twice the volts from the double as i get from the single.

  in time i will know the answer to this .

   but for now it would be nice to know .















 

[TheCasualTraveler]

      Looking good blue. You seem to be patient and perservering. In a quick google search I found several posts saying you could expect double the output from going dual rotor but you'll know first hand soon enough.

[ghurd]

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-

[blueyonder]

 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.  

[ghurd]

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-

[blueyonder]

 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.

 

[ghurd]

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-