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Nice LOW RPM Leeson DC motor/generator
By CmeBREW, Section Mechanical Posted on Wed Dec 19th, 2007 at 03:54:49 AM MST
Nice Low RPM PM Leeson DC motor/generator

Hello folks.
Thought I would just tell everyone about a VERY nice BRAND NEW Low rpm permanent magnet DC LEESON motor/generator I just bought and is still for sell on Ebay right now-- and for a very good price. It got here in only 3 days and is in its orginal Leeson box from the factory. Fellow member GHURD is who told me about it. Thanks Ghurd!
The motor is 180vdc at 1800 rpm.
I'm not the one selling them, nor do I know the guy-- rather I just bought a couple of them and think they are quality motors and could possibly make a nice LOW WIND generator (7 or 8' prop) or a real nice 12v pedal generator.
Here is the link:
http://cgi.ebay.com/75-KW-1800-RPM-180-VOLT-LEESON-DC-ELECTRIC-MOTOR_W0QQitemZ360005739871QQihZ023QQ categoryZ26226QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
There are only two days left. He may have more and may run it again. Just email the guy.
As Ghurd had approximated, the 12volt cut-in is about 135rpm. From my experience I think its much better than Ametec motors OR any treadmill motor for a wind mill since you can use a much bigger prop and get much more consistent power in the lower winds. When the two motor wires are shorted together, it is VERY hard to turn. (which is a good sign) Much harder than any treadmill motor I've ever tested.
I'm no expert, but I was thinking about a 7 or 8' diameter set of blades. Thoughts??However, it would probably be wise to furl early, to limit the amps in the higher winds.
I'm making a comfortable, relaxed pedal generator with one of these motors right now.

As you can see, I just duct taped my slow rpm drill to it to see what it will do into a 12 volt battery and 24volt battery bank. I did not have an 3/4" arbor.
Notice that even though the shaft is 19mm, all of my 3/4" pulleys fit perfectly over it. 19mm is just a half a hair bigger than 3/4".
Anyway during my tests, the duct tape would break at 5 amps into the 12volt battery.(65watts/ at about 280rpm/ guessing)
This is GOOD. Means it would do ALOT more watts as it goes faster.
It was not bearing down too bad on the drill either.
OPEN VOLTAGE of the generator was 61 volts DC at about 550rpm-600rpm. (this is the maximum rpm on my drill's rating label)
Hooked up to 24volts of batts it did 110 watts at about 500rpm which was the maximum for the drill. I believe then, that 24 battery volts is too high for this motor as a generator. But it was quite easy on the drill.
So this motor would be best for a 12 volt battery system I think. It might do over 200watts. It does have some cogging though--but no problem for a bigger prop.
However, I think the cogging might be too signifigant for a smaller 4 or 5' prop.

The two wires in the connection box look to be only about 18ga wires.
However you can easily put two bigger gauge wires in there place if you wish to.

Even though this motor is 'rated' for 4.5amps , there are 4 really big brushes in it and an 8 gauge BIG WIRE that comes from the brushes to screw terminals where the two smaller gauge wires hook up to. These brushes are TWICE as big as any treadmill motor brushes I have ever seen.
The brushes are EASY to replace from the outside.
The 'rating' of 4.5 amps is only what the motor draws as a MOTOR. If I make a mill out of my other motor, I'm going to have it furl at about 15 amps max.
This motor also has a SOFT rubber seal in front of the front bearing to keep water out-- which is nice. And the motor is totally enclosed and an external cooling fan on the back-- so that it will disipate heat very well thru the all aluminum body of the motor.
I just thought someone might be interested in one of these. These new Leesons usually go for over 3 times that price! (and he pays the shipping!)
Any questions or comments much appreciated guys.

Nice LOW RPM Leeson DC motor/generator | 24 comments (24 topical, 0 editorial)

Re: Nice LOW RPM Leeson DC motor/generator (3.00 / 0) (#1)
by Flux on Wed Dec 19th, 2007 at 02:05:17 AM MST
(User Info)

Nice unit with a decent shaft that will support a 6ft prop.

Just don't be to greedy with the current you ask of it. Its continuous current rating will be 4.5A. It will no doubt accept a fair overload for short periods in wind duty but the heating goes up with current squared. There may be limitations on the commutator and large overloads may cause sparking with rapid wear. The ultimate instantaneous current limit will be when the armature reaction demagnetises the magnets. If these are ceramic your 18A may be asking for trouble.

That is probably slow enough to use 24v in a good wind area with fast prop and that would let you get more watts for the same current limits.

Flux

Re: Nice LOW RPM Leeson DC motor/generator (3.00 / 0) (#2)
by CmeBREW (smke833f@hotmail.com) on Wed Dec 19th, 2007 at 08:07:05 AM MST
(User Info)

Thanks Flux.

I've been using a treadmill motor wind mill rated for only 5 amps (@12vdc) , and It goes over 10amps quite often. It has even went over 14amps briefly many times--and the brushes show little wear in a year. The brushes on this new motor are TWICE as big. The brushes on this new motor are bigger than some treadmill motor brushes rated at 18A. Of course, everyone has to use there own judgement when using a motor as a generator. But I have had good experiences so far.

"The ultimate instantaneous current limit will be when the armature reaction demagnetises the magnets."

I wish I understood this statement. The armature never even touches the ceremic magnets--and it disipates heat thru the aluminum body?? I don't see how it can demagnetise.

I thought about the 24 volt system. But I suspect the cogging may be too much for only a 6 ft. 3 blade prop. I could be wrong. I was even thinking of 6 pvc blades to get over cogging to use as a 24volt system as you say to cut amps in half.
If I make a 7' mill out of it-- I was going to risk upto 15 amps at 12volt and furl.
I think it will be fine--like my smaller mill.

Thanks for sharing your knowledge--

[ Parent ]

Re: Nice LOW RPM Leeson DC motor/generator (3.00 / 0) (#3)
by Flux on Wed Dec 19th, 2007 at 08:31:33 AM MST
(User Info)

The current flowing in the armature of that motor will also produce a field and this will react with the main field of the magnets. There is a demagnetising component that depends a lot on the position of the brushes and under the worst conditions the field is sufficiently demagnetising to weaken the magnets. Heat will not bother ceramic magnets, the winding will fry long before that. If the magnets are neo then then armature reaction is unlikely to be sufficient to do any damage, but they could be subject to heat damage.

Flux

[ Parent ]

Re: Nice LOW RPM Leeson DC motor/generator (3.00 / 0) (#15)
by CmeBREW (smke833f@hotmail.com) on Mon Dec 31st, 2007 at 06:15:26 PM MST
(User Info)

When I said above:

"I've been using a treadmill motor wind mill rated for only 5 amps (@12vdc) , and It goes over 10amps quite often. It has even went over 14amps briefly many times--and the brushes show little wear in a year."

The motor I mentioned above at 5 amps is NOT rated at only 12vdc. I meant that it generates into a 12v battery bank. This 5amp permanent magnet treadmill motor is actually rated at 260 vdc. I just didnt want to mislead new ones thinking that a 12vdc motor could be used as a windmill.

Today I have been testing the NEW motor (cut-in about 135rpm) with 7' diameter PVC blades and it is doing VERY WELL in low winds! I meant to make only 6' diam. blades , but it wound up being 7'.
I made the blades like Ben's at "Gotwind.org". I made only 3 blades and it gets over the cogging of the motor very easily. It starts turning in the smallest breeze. I will show pictures soon. Tonight and Tomorrow are 50mph+ winds though. I don't have any furling on it yet, so I have to tie it down. I got more testing to do to quess the Watts better in low and medium winds.

[ Parent ]

260 volt tread mill motors (3.00 / 0) (#16)
by northeast winds on Wed Jan 2nd, 2008 at 07:38:42 PM MST
(User Info)

Hi Parent i to iam starting my first wind gin and useing a tread mill motor of the 160 volt. It sounds like i should upgrade to a260 volt.I also will be making blades out of pvc. It is good to here your happy with your initial results. Be fore i read you post i had read Terrys test results and recomendation at TG winds on treadmill motors His recmendation was gear up 10 to 1 and blades 9'.3 inch in dia.I am incouraged hearing your happy with your work. I looking forward to learning more from you. I am on a tight budget these days. thanks to all who are willing to share FRED

[ Parent ]

Re: 260 volt tread mill motors (5.00 / 1) (#17)
by CmeBREW (smke833f@hotmail.com) on Thu Jan 3rd, 2008 at 09:42:21 PM MST
(User Info)

Hi Fred, (Northeast wind)

Actually, I'm afraid I don't have any kids yet. When I talked about kids having to pedal for their TV time, I was thinking of all my brother's and friends hyperactive children.
Good luck on your first treadmill windmill.

The RPM rating on the motor is very important also. You want the HIGHEST DC VOLTAGE with the LOWEST RPM you can find.
Finding a good direct drive treadmill motor is not that easy.

You can hook the DC motor to a 12volt battery--and however fast (rpm) the motor turns, then thats about how fast the blades of your mill will need to turn the motor to reach the 12v 'cut-in' point and begin making power into the battery(s). (It has worked for me)
The dc motor I just purchased above turns about 130-140rpm when hooked to a 12v battery. (so it worked again)

I hear that Gearing is normally something you should probably avoid unless you HAVE to do it.
The cogging on the motor will be multiplied by however many ratios you must gear it up. A 10:1 gearing would be very hard to start to turn. It could take too strong a wind to get it started, and so you would miss out on alot of power.
I personally have never tried gearing though.

Yes, I was somewhat pleased with my initial results and how easy the blades get over the cogging of this motor in 5mph tiny breezes and they were initially spinning almost all the time at 100-120rpm or so in the breezes. But I had not tested the power yet at that time. I still need to make many adjustments to the blades to get them FASTER rpm in low winds. Thats what I'm striving for.

Heres a picture of my initial testing with the pvc blades at a steep angle:

I am doing all kinds of basic testings. Of course there is no furling yet- I am just pointing it into the wind for now. The motor is exactly what I wanted with 12v cut-in at only about 135rpm. Each Pvc blade only weighs 1.5 lbs. (a very light 7' diameter prop)

The blade angle at the tip was 10 degrees which is too much. I believe the blades were stalled since the blades were beyond 12 degree angle just a couple inches from the tip. I am just trying many different things to learn.
I actually was hoping the blades would TWIST back automatically to better angles in the winds. Didn't happen though. So I will put rubber under them and bring the angle down more and more with testing to hopefully get them into lift and more speed.
Even with the blades at wrong angles, the mill still gave me about 140 watthour during a faily windy day to watch an hour of TV.(140watt TV) Not much, but I can only go up from here with better angles!
I may need to make faster wood blades for what I'm trying to do. Not sure yet.
I had almost no time to work on it. This weekend I should get some time to get better results.
I will do more with the pvc blades though (which were VERY easy to make out of 6" pipe)
and put my progress in my DIARY very soon hopefully in just days.

[ Parent ]

Re: 260 volt tread mill motors (3.00 / 0) (#18)
by northeast winds on Fri Jan 4th, 2008 at 12:27:03 PM MST
(User Info)

cmeBREW: Thank you for all the imfomation it sure sounds like your on top of the small adjustments that will make that mill something you can be proud of. I'am just starting on mine and trying to nail down what motor to build on? I may not go with my tread mtr. 130 volts @6300 rpms and 18 amps it all makes sence about staying away of gearing up. I sure would like to chat with flux he sounds wicked pleased with his progress and what hishas put out. 260 volts tread motor. I found your leeson for $135.00 does that sound about right? Iam between that and the Indiana 24 tested out 14 volts @ 229 rpms it also reaches 28 amps before demagtize. It sure nice to know we have all can be of help. I want to thank you for taking time to pass on your thoughts they make good sense. Talk to you latter FRED

[ Parent ]

Re: 260 volt tread mill motors (3.00 / 0) (#20)
by CmeBREW (smke833f@hotmail.com) on Fri Jan 4th, 2008 at 03:15:43 PM MST
(User Info)

Hi Fred.

I think you should go with the Indiana 24. From everything I have heard, that is the BEST you can get. Excellent low cut-in. You can't go wrong with that nice motor. It is well worth the extra money.

I am no expert but I would think you can at least put a 5 foot diameter set of pvc blades on it and it will do great.(Decent Wood blades would do even better)
I don't know the shaft size though. Make sure you have furling. I wish I had put furling on my small 4 foot treadmill motor now. Upto 80mph winds a few weeks ago made it spin probably 2000rpm and it sounded like a Jet engine roaring above my roof!

Real scarey. Amazing what those thin pine blades can take. It was powering 2 small car heaters (180W x2) all night. (heat coming from both) It was the strongest winds I have ever seen. I think the weather has gone Bonkers!

What I am doing with this new motor may be alittle risky but I think it will be alright with early furling to limit the amps. We'll see.

Yes, you should go with the Indiana 24.
That other treadmill motor of yours (160v) would not make a good windmill I'm afraid. The 12v cut-in would be like 600rpm which is just too high. (Unless you live on Mt. Everest that is!) Now I see why you were thinking about gearing. 3:1 gearing would probably work , but start ups would be difficult in low winds.

Have fun with your mill!

[ Parent ]

Re: 260 volt tread mill motors (3.00 / 0) (#22)
by CmeBREW (smke833f@hotmail.com) on Sat Jan 5th, 2008 at 08:22:04 AM MST
(User Info)

Fred, I don't know if you seen it but here is some good info about the Indiana 24 a few months ago. Sounds real good.

http://www.fieldlines.com/story/2007/11/18/15251/293

[ Parent ]

Re: 260 volt tread mill motors (3.00 / 0) (#23)
by CmeBREW (smke833f@hotmail.com) on Sat Jan 5th, 2008 at 05:25:35 PM MST
(User Info)

Fred,

You may also want to wait for my info on this Leeson low rpm genny. It is very interesting also. I changed the blade angles and it is doing much better in lower winds already. And I know how to improve it again now.
I am excited about the results I just got tonight:

I made this in only 6 hours. (not including setting post)
I am still going to put furling on it though. The straight tail is just for testing.
This mill has almost 3 times the swept area of a 4' small mill.
Can't go wrong with more swept area!

The winds are lower now at about 10-15 (quess) and it is doing Alot of 1 to 3 amps into the battery. I can approx the watthours better tomorrow.
I love this WAY better than my 4' treadmill motor windmill already! I am certain of that.
I will try my best to show the pictures and progression Sunday night in my DIARY.

[ Parent ]

Re: 260 volt tread mill motors (3.00 / 0) (#19)
by ghurd on Fri Jan 4th, 2008 at 01:50:26 PM MST
(User Info)

If you are aiming standing behind it, a tail will sure make the output rise, after you get out of the way. Much more than I expected it would.
You are slowing down the 40.4% (100% - Betz) that must get past the blades.

[ Parent ]

Re: 260 volt tread mill motors (3.00 / 0) (#21)
by CmeBREW (smke833f@hotmail.com) on Fri Jan 4th, 2008 at 04:24:23 PM MST
(User Info)

Thanks Ghurd.
I was really not standing right behind it when I was testing it. I just aimed it into the wind and went inside my door 30 ft away to measure amps into a 12v battery.

I hate to confess that I was actually only using a tiny 20 ga. speaker wire (30ft long) when I did the initial testing. I forgot to buy my 8ga bigger wire when I went to the store last week. I couldn't find anything bigger for the testing! I will get decent size wire real soon.

I did get a max of 3.5amps in a fairly big wind gust though. (guess 25mph) Mostly just 1 and 2 amps. With the much bigger wire I hope it will do more this weekend --and when I improve the blades for less drag and more lift. The blades never did spin out of control though-- showing just how bad they must have been with the first mounting attempt. It was more just an experiment. I can only improve from here I think.

It sure is nice to have some fun even in the freezing winter!

[ Parent ]

Re: Nice LOW RPM Leeson DC motor/generator (3.00 / 0) (#4)
by CmeBREW (smke833f@hotmail.com) on Wed Dec 19th, 2007 at 08:59:17 PM MST
(User Info)

Thanks again Flux.

I did not know that about ceramic magnets being heat resistant like that. I am beginning to see what you mean about limiting the AMPS for this motor.

I finally got some time after work to do more testing with my drill and even stronger duct tape and a bolt--and now I can see that this motor as a generator would not efficiently go upto 200 watts into a 12 volt battery bank as I had hoped. To the best of my guessing rpm with my drill, this motor looks like it does the following into a 12v battery:

-50 watts at around 200rpm
-70 watts at around 300rpm
-84 watts at around 400rpm
-100 watts at around 500rpm

Looks like it starts becoming very inefficient soon after this point.
Into a 24volt battery bank, it does about 110watts at around 500rpm. But the watts would go up somewhat more at 600rpm into the 24v batts I believe.

So it seems to me now that I wouldn't ever want to go much above 7 amps. (at 14v charging battery= 98watts or so)

You were right about the amps,, I got greedy.
However, I STILL believe it would be MUCH better than any Ametec, treadmill motor, 403, airx, etc, etc.

My reasoning is this:

Because, if I made a 7 foot diameter set of blades for this motor, this mill should be putting out PLENTY of consistent LOW WIND WATT HOURS PER DAY under 10mph breezes (10-60 watts) --- where as ALL those other small 4'mills can't even START producing power in breezes under 10mph! (which is what happens over 90 percent of the time)

WATTHOURS PER DAY is the main thing I understand.(Normal set-up/NOT grid tie)
And the average wind speed around my area is less than 10mph.
Am I crazy for thinking this way??

I obviously would have to furl very early to keep it under control in the rare bigger wind gusts to keep it under 110watts.

I think I will try this since I am so curious now.
If it spins out of control and destroys, at least I will have learned something, and I will still have my comfortable Pedal generator made from the other motor!

-Thanks.

Re: Nice LOW RPM Leeson DC motor/generator (3.00 / 0) (#14)
by Norm (peppysue@suite224.net) on Sun Dec 23rd, 2007 at 09:25:10 PM MST
(User Info)

Let me know how this works out for you as wind
around here is under 10mph a lot of times.
( :>) Norm
[ Parent ]

Re: Nice LOW RPM Leeson DC motor/generator (3.00 / 0) (#5)
by Norm (peppysue@suite224.net) on Thu Dec 20th, 2007 at 12:37:41 PM MST
(User Info)

Duct tape in this manner, AKA Universal Flexible
coupling....LOL !

( :>) Norm

Re: Nice LOW RPM Leeson DC motor/generator (3.00 / 0) (#6)
by CmeBREW (smke833f@hotmail.com) on Fri Dec 21st, 2007 at 08:10:28 PM MST
(User Info)

After thinking about it more - I think a 7' prop would be TOO much for that (about) 3/4" shaft on that motor.(as Flux said)
I believe i'm going to try the 6' prop with probably 5 or 6 blades to get over the cogging in 5-8 mph breezes.

I think it will be difficult enough to control even with a 6' prop since it would practically be in a 'free-spin' anyway at under only 100watts max. I'm certainly no expert- but thats what concerns me most. It would be a very interesting challenge though to control it.

I do not encourage anyone to try a 7' prop on that motor. I suspect without special safety mechanisms it could be in danger of losing control when VERY BIG winds (+50mph) come around even while fully furled and 'shorted' thru 1 ohm heating elements. These insainly strong winds are happening more and more now I've noticed.

If the motor shaft was 1" I would probably try it--but definitely ONLY with an automatic emergency brake of some sort because it would practically be in a 'free-spin' condition all the time. My plan was to shut it completely down when bigger winds come around. I'm not so sure that would be good enough now.

I've been trying to think up a safety mechanism in case the furling gets held back during high winds due to the wires in the mounting pole reaching maximum 'twist' without me being aware of it. That is not so easy.

If the wires at the bottom of the pole could 'unplug' ITSELF at 'maximum wire twist' in order to ALLOW the furling system to keep working correctly AND at the same time trip a big relay that would 'short' the generator into the 'shut-down' heating elements automatically??? I'm not sure of the design yet. I will keep working on it.

One thing I am certain of though, it IS a fun motor to play with and WILL make a very nice pedal generator --with only one single gearing --instead of having to do two separate 'gearings'as most require. Should mean more watts for the efforts since there is less frictional losses. I'm not going for the 5 minite 100watts super workout though--because I would never use it! I'm going for the EASY , lazy, comfortable 30-60watts consistently WHILE I watch a movie each night. I will post it when I get it done.

Thanks.

Re: Nice LOW RPM Leeson DC motor/generator (3.00 / 0) (#7)
by Norm (peppysue@suite224.net) on Fri Dec 21st, 2007 at 08:32:12 PM MST
(User Info)

Think 15 watts for easy lazy pedal power....
( :>) Norm
[ Parent ]

Re: Nice LOW RPM Leeson DC motor/generator (3.00 / 0) (#8)
by CmeBREW (smke833f@hotmail.com) on Fri Dec 21st, 2007 at 09:14:12 PM MST
(User Info)

Heres the guys final 3 remaining motors If anyone is interested. He raised the price though $25. (still free shipping though)

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=360007688061&ssPageName=MERC_VIC_RSCC_Pr3 _PcY_BIN_Stores_IT&refitem=360005739871&itemcount=3&refwidgetloc=closed_view_item&us edrule1=StoreCatToStoreCat&usedrule2=CrossSell_LogicX&refwidgettype=cross_promot_widget

Thanks Norm. I hope i'm not quite THAT out of shape and lazy! I hear YOU can easily do 20watts sustained with only one arm. You must have forearms like Popeye!

Re: Nice LOW RPM Leeson DC motor/generator (3.00 / 0) (#9)
by ZooT on Sat Dec 22nd, 2007 at 11:49:38 PM MST
(User Info)

Geez......it's Dec 23rd here and the price is now $125...........

He can sell them to somebody else.......

Re: Nice LOW RPM Leeson DC motor/generator (3.00 / 0) (#10)
by ghurd on Sun Dec 23rd, 2007 at 07:30:32 AM MST
(User Info)

It still beats an Ametek that sold for $110 on ebay!
G-

[ Parent ]

Re: Nice LOW RPM Leeson DC motor/generator (3.00 / 0) (#11)
by CmeBREW (smke833f@hotmail.com) on Sun Dec 23rd, 2007 at 12:02:33 PM MST
(User Info)

Yes, I WISH I had had the time to throw a 6' prop on it and see what it REALLY does in a wind. But I didnt have the extra time before the auction ended -- but the 'numbers' looked very promising.

I only get the weekends to do a few things. I will get a 6' prop on it and see what it does- and then we can have a better idea if it is worth it.
Obviously there are many reasons that an PM ALTERNATOR is MUCH better since one doesn't have to contend with any cogging or ever worry about brushes. However, if this works good, this could be a good alternative to those small 4' Ametek generators. I'm not sure yet. I think its worth trying to find something better.

I will soon see how these type motors will perform. I am concerned about controlling it in mega winds though. (even with early furling)
Today we are again getting over 50mph wind gusts. (and tonight too)

Has anyone ever tried the following for a SIMPLE SAFETY shutdown:

I'm just going to use a normal 15amp light switch in a utility box.
I want to place the hose clamp at just the right place so that the mill can still furl a couple more revolutions even AFTER the 'shorting switch' is tripped. Also need alittle piece of rope as a STOP to keep the trip rope from pulling and breaking the switch lever off.

That is the whole purpose of this-- to 'shut down' the mill BEFORE maximum twist of the wires inside the pole.
When I test this motor with a 6'prop , it will be on a short pole right at the corner of my house with alot of turbulance. It will most likely twist up the wires alot. Any attempt at extra Safety and control is good I think.
Any thoughts welcome.

Re: Nice LOW RPM Leeson DC motor/generator (3.00 / 0) (#12)
by ghurd on Sun Dec 23rd, 2007 at 03:47:30 PM MST
(User Info)

Might spend an extra $5 on a "Spec Grade" 20A 277VAC switch?
Lowe's, Home Depot, etc.($5.50?)
They lightly spray paint one end of the mounting tin blue or red. Can't recall what is blue and what is red.
It couldn't hurt.
G-

[ Parent ]

Re: Nice LOW RPM Leeson DC motor/generator (3.00 / 0) (#13)
by CmeBREW (smke833f@hotmail.com) on Sun Dec 23rd, 2007 at 04:52:12 PM MST
(User Info)

Good idea Ghurd. I will. Since I'm only going to have a 10'or 12' pole, it might just trip more times than I would like. More amps the better.

[ Parent ]

Re: Nice LOW RPM Leeson DC motor/generator (3.00 / 0) (#24)
by CmeBREW (smke833f@hotmail.com) on Mon Jan 7th, 2008 at 08:23:07 PM MST
(User Info)

After watching my mill close to the ground level, I doubt that safety switch is even needed. As everyone else does, a simple plug set (male/female) is good enough to occasionally let the wire unwind. I quess I was just being a nervous nelly. Could also just tie a flag to the wire at the bottom to give indication that it needs unwinding. It would be quite rare. I have never had to unwind the small mill on my roof even once.

[ Parent ]

Nice LOW RPM Leeson DC motor/generator | 24 comments (24 topical, 0 editorial)

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