1/2 hp mod wind test.

[Jerry]

Did a lathe test and wind test of 1/2 hp 120v 6 pole ac motor conversion.

Actully used a big variac & a 2.5 hp dc tredmill motor to power the 1/2 hp.

I did rpm reading from 1 amp up to 20 amps. Hit 10 amps at 558.1 rpm at 53.99 volts for 539.9 watts.

The first blade I tryed was 4 of my plastic blades at 49" tip to tip pitched at 27 degrees at the hub to just a few degrees at the tip.

This combo hit 10 amps at 30 mph this was at 60 volts for 600 watts. This combo hit 100 watts at 10 mph thats about 388 rpm.

The second blade was a larger 3 blade at 55" tip to tip pitched at 23 degrees at the root to almost flate at the tip.

This blade did not preform as well as the smaller 4 blade. It only did 23 watts at 10 mph and only 456 at 30 mph.

I was surprized the smaller blade had more power in this test.

It did show me that the smaller blade was spinning at over 550 rpm at 30 mph while producing 600 watts.

I compair this combo to my 48 volt 403. It way out preforms the 403. It made no noise and was way cheaper.

I'll be trying a set of 7 ft Lakota blades on this genny in a few days. I'll report back the #s I get.

                         JK TAS Jerry

[wiredup]

hi jerry great work ,as usual.did you do any mods to the wiring or leave it stock. how many and what size mags did you put in. need some of the mods if you can, ihave a 3/4 hp apart need to get back to it.thanks....johnny

[hvirtane]

Great work.

Can you publish any pictures

and coils specifications of

the conversion and specifications

of the magnets?

- Hannu

[hvirtane]

Hi,

this is the same generator as here?

http://www.fieldlines.com/story/2004/11/23/221325/09

- Hannu

[Jerry]

Hi Johnny & Hannu

The motor is a GE 1/2 hp, 1140 rpm, 6 pole, 120 vac, single phase, 9.9 amp plus about 5 amps of start windings.

I left the wireing stock since this motor is used for 48 volt battery charging.

I've used 2 sets of 6 of the old # 29 curved NEOs from Wondermagnet.com our housts.

Unfortunatly these magnets are no longer available. 6 fit nicely around a 3" diameter solid steel armature I've made. I used a small wood spacer between the 6 magnets. I scewed the magnets sets offset from each group about 1/8". This greatly reduced cogging.

The gap between magnet and stator is 1/16".  I'm hopeing to see around 1,000 watts at 30 mph? Might be wishfull thinking though?

This motor conversion should be able to do 1,000 watts without over heating since this was its rateing as a motor.

This is an unusual motor because its twice the size and amperage of a normal 1/2 hp ac motor.

Normally its a one HP that has 9.9 amp rateing.

I use a fullwave bridge diode on the start windings and a seperate fullwave bridge on the run windings and then perelell the dc outputs of the bridges. This conversion makes this a 2 phase PMA.

I also took addvantage of putting in a 3/4" shaft. This helps handle the added stres of the blades. The bearings were easy to upgrade from the original 5/8" shaft. I put shaft coulers on the shaft to keep it centered.

 If I were going to use this unit for lower voltage I would have reasigned the coil arangement.

I'll Try to get some pics.

                              JK TAS Jerry

                           

[Jerry]

Hi Hannu

Yes this is the same genny. I'm just doing some follow and update on testing.

                      JK TAS Jerry

[hvirtane]

As curved magnets are

not easily available,

did you ever try cutting

rectangular ones into curved?

It might work with some

kind of water grinding machine?

- Hannu

[Jerry]

Hi Hannu

My idea is to try some 2"X1"X1/2" bar magnets on a square chunk of steel and compair this to a set of curved NEOs.

I think since the bar magnets will no set a flush (only at there edges) and not be as wide there power will be less. However the are twice as thick and this may make up for the diferance?

This is a test I've been wanting to try for some time now. Thats the problem finding time.

So many test to be made so little time. The list of want to do is always in the shadow of have to do or required to do.

                              JK TAS Jerry