TheBackShed.com

Forum Index : Windmills : The LG Project

Page 4 of 4

Author

Message

VK4AYQ
Guru

Joined: 02/12/2009
Location: Australia
Posts: 2539

Posted: 12:10am 30 Jul 2011

Copy link to clipboard

Print this post

Hi Bruce and Rastus

I played with a circuit a while back that was simple and seemed to work, it was using a headlight relay with a cap across the coil so when it pulled in it charged the cap a bit and caused the relay to chatter, the larger the cap the slower the chatter it had 3 diodes connecting it to the three phase lines one direct and the other two through a inductance in one line and a cap in the other, by changing the connection of the cap and inductor it would kick in opposite directions.

It was crude rude and unrefined but it did get the motor moving a bit, enough to break out of cogging, would need some sort of automatic control on the switch though as I never got to that.

All the best

Bob

Foolin Around

Don B

Senior Member

Joined: 27/09/2008
Location: Australia
Posts: 190

Posted: 05:56am 30 Jul 2011

Copy link to clipboard

Print this post

Hi Rastus,

I think that your last post regarding positioning the rotor for a kick start could be on the money.

If you were to energise any one winding, whether star or delta connected, with some DC, then you would attract the magnet of the appropriate polarity over that pole piece. If you then reversed the polarity of the DC to that winding, you would repel the magnet, and attract the next one. Hopefully, the blades will be kicked in the correct rotation direction when this happens because of the torque exerted by the wind, but, even if not, any movement might be enough to get going.

In my experience, you don't need a lot of movement or rotational speed to unstall the blades sufficiently to get going once you are above the minimum operating wind speed. If the first pulse did not result in any useful movement of the blades, then certainly the second (reversed polarity) one should.

Probably the best way to do this would be to have two relays. The first would briefly switch the selected phase out of line to the DC kick start source, and the second would also briefly switch it out of line, but across the kick start source with reversed polarity.

The only other things that you would need would be a way to measure wind speed, and something to operate the relays to pulse them one after the other. Oh yes, and something to lock the kick start circuit out once the generator was running (maybe just another relay with its coil downstream of where the kick start relays switch the phase line out of circuit for the kick start).

Certainly not too complicated. Anyone want to try it and post their results?

Regards

Don B

VK4AYQ
Guru

Joined: 02/12/2009
Location: Australia
Posts: 2539

Posted: 09:06pm 10 Nov 2011

Copy link to clipboard

Print this post

Hi All

Second thought on cogging, I have been doing some observing during the light winds we are having at the moment on the old Chinese mill which is a bit prone to cogging, and my conclusion is that cogging can be a mixed blessing.

It stops the mill from spinning away doing nothing useful and when the wind gets strong enough to overcome the cogging it is strong enough to start charging, so unless you have a bad cogging problem or a hard to start set of blades it reduces wear on the bearings.

All the best

Bob

Foolin Around

Rastus

Guru

Joined: 29/10/2010
Location: Australia
Posts: 301

Posted: 11:55am 11 Nov 2011

Copy link to clipboard

Print this post

Hi Bob,
I agree fully with your observation and conclusion where the wind is in light gusts.With a light consistant wind all day,at lowest power exstraction level,but not high enough to overcome cogging,is still teasing me!I've learned that the F&P washing machine controls have a motor position sensor,which could make kick starting consistant.I do feel engaging this manually,having taken consistant wind readings,will ensure the pulse power is regained and not wasted.I've got the controls but havn't worked them out as yet.It's still an idea at this stage.Cheers Rastus

see Rastus graduate advise generously

brucedownunder2
Guru

Joined: 14/09/2005
Location: Australia
Posts: 1548

Posted: 09:35am 16 Feb 2012

Copy link to clipboard

Print this post

OK, I've scrounged a few "LG" units,( F&P) and if you look back , you'll see I've stripped some apart, posted some good info , and I'm fairly well confident they could be a good build. ( mind you , after 15 odd years , I'm tired of fiddling around with F&P ).

Anyhow , since I treat this as my pastime hobby and not for any profit , I'd like to try and "modify" a "LG" to see what we can come up with . No big deal ,just an experiment -like the Seeley, it's also in the playpen ,one day ,oh my god .!!!

Anyhow, anyone know of Neo's that have been retro-made for these LG motors??

More importatly ,,, has anyone actually got one up and turning???

Thanks

Bruce

Bushboy

VK4AYQ
Guru

Joined: 02/12/2009
Location: Australia
Posts: 2539

Posted: 01:14pm 16 Feb 2012

Copy link to clipboard

Print this post

Hi Bruce

I used the 12.5 x 6mm neos from free energy magnets Bris on ebay picture on page 2 I think they worked very well but have gone up a bit since I bought them.

I haven't got mine working yet as the windings got damaged in the fire I had in my workshop and without a part number I cannot order a new winding.

I may try to repair the original windings but not at the moment as I would rather buy a new set.

I have located a high voltage MPPT regulator that would work well with it so am getting a bit more excited about the project, I got a set of slip rings off Phill and am now designing a furling device for it.

All the best

Bob

Foolin Around

brucedownunder2
Guru

Joined: 14/09/2005
Location: Australia
Posts: 1548

Posted: 05:10pm 09 Dec 2016

Copy link to clipboard

Print this post

I caught some other posts of the lg today by other members..

I've posted this to take you (mainly new interested builders) back to where you might like to start your journey.. not intending to skuttle anybodys link,so please excuse.

Search for 20 minutes around this posting and you,ll find some interesting reading.

I've still got a crate of dismantled lg,s ready for that day I get my act together-

I've got cronic kidney desease developed in the last 9 months , so my strength is now down to 10% of yesteryears-things take a lot longer for me to do nowdays...

Bruce

Bushboy

Page 4 of 4

Print this page

To reply to this topic, you need to log in.