Bench test 14-11 ceramic.

[Jerry]

We'll i got the 14-11 ceramic assembled enough for some bench testing.

Even though it 27% outside and the grid is down right now (love that backup power).

Here are the #s so far.

               Hughs 4ft                        14-11 ceramic

 PMA,s amps                              

   1 amp        327 rpm                           299 rpm                          

   2 amps       350 rpm                           326 rpm

   5 amps       426 rpm                           394 rpm

   7.5 amps     493 rpm                           430 rpm

   10 amps      582 rpm                           516 rpm

I actuly ran the 14-11 up to 23 amps for 10 minuts. The heat in the stator was well within reason, not bad at all.

 I only did a torque measurment on both at 5 amps. Hughs torque was 1 LB 13.5 oz and 194.98 prime driver watts.

Since the 14-11 ceramic is a slightly more powerfull PMA it took slightly more torque but less prime driver watts.

 14-11 torque 1 LB 15 oz. but only 144.75 prime driver watts. Lower RPM?

Even though there is iron in the center of the coils it spins by hand real easy and keeps spining with some flywheel charicteristic.

At higher rpm you can hear a bit of a mone from the stator. Just like a real stator under load?LOL

Here are a few pictures.

This is 1 magnet rotor disc in the speaker basket prier to assembly.

   

At this point I'm very happy with this PMA. $15 worth of magnets rather then $90 and a littel better preformance.

I'll do the more complete compairison after the wind tunnel test. That may be a month or 2 away however?

                       JK TAS Jerry

[Norm]

Jerry like your torque measuring gadget...neat !

[Garry]

Very nice work, Jerry

Garry

[oztules]

23amps out of 4400 turns of spiderweb..... how do you do think of these things Jerry!!

You never cease to amaze me.

.........oztules

[electrondady1]

thanks for scouting out this alternate path jerry.

and all the other innovations you have come up with.

[tecker]

the ceramics really cut the cost . Do you think the  metal in the center make a diference ? I like the speaker cages looks very strong and good support for the stator .

 

[Jerry]

I was thinking that the ceramic magnets would need all the help they could get with there weak flux.

That was the insperation for the powdered iron in the coil centers. After making the test stator with the iron and finding it didn't present much of a cooging isue I desided to press on with the PMA.

Checking the resistance of each coil at 6 Ohms gives aproximent ESR of the hole PMA of .55 Ohms.

I made a quike check of the Hugh 4ft PMA this morning and found that each coil is about .5 Ohm.  In the star configuration this would equal an ESR of about 2 Ohms.

Strange to think that the 14-11 with the 4400 turns of 24 ga. would have a much lower ristance than the much large wire ga. 85 turns per coil of the 6 coil star unit.

Thanks for all the coments folks. Now back to the lab.

                          JK TAS Jerry

[KurtJ]

Jerry, Gotta tell ya that your genny is a thing of beauty! Clean, neat, tidy and using recycled parts, GREEN ROCKS! Keep up the great work and Thanks for sharing.

[Jerry]

Thanks KurtJ.

Many people seem to like the PMAs I make with the speaker baskets.

I would like to make a sugjestion.

My wife and I own and operate a retail car stereo store. I've been doing this since the 70s.

I sugjest that many of you could aproach your local car stereo shops and ask if they might have any old no value cast basket subs that have no other value then a door stop.

A woofer thats out of warranty and is only in there way and gathering dust. A dead unit customers just left behind when a new unit was installed in there enclosure.

Show them a picture or 2 of mine and explain how you can help make the earth a much better place by turning it into wind generator as aposed to just ending up in the landfill.

Maybe have the manager call you if something comes in or stop in once a week. Belive me most shops get a few door stops every mounth.

Maybe offer the installer $5 if the basket meets your needs. You can use just 1 but 2 is a littel stronger.

They don't have to match. just the size needs to be the same not the brand or style.

There are sutle size diferances so hold basket to basket to see if they match.

They a very nice base from witch to biuld a pma.

I'd like to see other people using them to. The magnet end caps make nice blade  supports or small magnet discs. Or shaft adaptors for larger discs. I've taken some 11" discs off some large heavy subs.

The magnets are fun also. Cut the magnets into pye sections for your own 14-11 ceramic with a wet tile saw?

Lots of free fun.

                            JK TAS Jerry

[jlt]

that is very entrusting project that your building. but with the cost of neo,s  i think that they save money.mag,s for hughs 4ft are only about 34. dollars.  i have built several machines  with neo.s on 1 rotor and ferrite  mags on the other rotor.

         

[Tritium]

Hey Jerry,

You don't have a couple of extra baskets laying around do you? No car stereo shops for nearly a hundred miles from me. I bet shipping would be less than the gasoline to get to a shop and back.

Thurmond

[scoraigwind]

If my four footer, single rotor 12-volt machine is correctly made with 80 turns of 16 ga. wire per coil, then the stator resistance is just under one ohm.  Of course you could increase the performance quite a bit by adding a steel disk with no magnets on it opposite the magnet disk (as in the six footer design).  But the idea of the four footer single disk is to make the construction simpler (and of course to match the power ansd speed of the four foot blades described in the text).

I think there is a lot of potential for using ferrite magnets to cut down on costs if you do not mind a bigger alternator.  The big alternator also has more stator surface to dissipate heat.  I would be dubious about putting iron in the stator myself.  But it seems to be working out OK.  Nice project.

[Jerry]

Hi Hugh.

Thanks for your coments. Its been a long time since I've looked at this diary entry.

This is one of the problems that the ADMIN causes by asking people to only respond in the original posting.

Original postings get long forgot and overlooked.

I built this alternator as an inspiration from Flux. Some time back he said it would be very dificult to build a 4ft wind generator that would outpreform your 4ft machine.

I like a chalenge. This is not to be a continude design. It just meets the chalenge.

I will be compairing your 4ft alt with your 4ft carved wood blades once my blade guy finishes them.

My idea was to use ceramic magnets, none star or delta, 3 amp doides, very thin wire, plastic blades, iron in the coil center and a odd coil to magnet count. Then equal or better the master in a same size machine.

Now thats realy thinking outside the box. I don't think there is enough of that.

I have ment no disrespect. I've just reported on what I've done.

I have built your alternator to your specs. After I've done all the comairison testing I will add the second steel disc, Jerry Rig it and fly it.

Should be a great machine.

                            Jerry

[Jerry]

Hugh one more thing. My littel 8" duel rotor machine way out preforms both of the above units with the same 4ft blade.

Thats my "Littel Yellow" genny that did over 1200 watts in a winter storm at 68 mph and survived 80 plus mph no furlling and survived without a scrach or even a burnt coil (small wire, 6 amp doides "Jerry Rigged").

                         Jerry