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Forum Index : Windmills : servo motors
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97fishmt Regular Member  Joined: 19/04/2010 Location: United StatesPosts: 77 |
Last time I was at the cabin (2 weeks ago) I had 2 trace c-40's dumping 400watts each from the wind and sun. I think my batteries are toast from welding from them to build the tower last fall. They charge up but don't hold a charge. Although I didn't realize what a big difference temperature has on batteries. I need to get the temp compensation units for the C-40's. |
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| 97fishmt Regular Member Joined: 19/04/2010 Location: United StatesPosts: 77 |
It's easy to get it to do this with enough offset and a light tail. 
It limits its output an keeps it safe. |
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| 97fishmt Regular Member Joined: 19/04/2010 Location: United StatesPosts: 77 |
But try and dial it in to take advantage of the winds power once you get close and starting with a light tail to have it look like this powering through the storm and putting out power. 
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| birdhouse Regular Member Joined: 27/01/2009 Location: United StatesPosts: 63 |
fish- yea, i did 6" of offset for a 101" prop. about 6%. thinking about using bs-1088 okoume 4mm ply for the tail. it's light, bends really well, and is super good for the elements. i think i may even have to add weights for the tail to keep it from furling too early, but i guess time will tell. when i wled up at my place i hook my mig to the generator, but have always wanted to try stick welding right off a baterry bank! nice looking tower! how tall is it? birdhouse i pee more than once before flushing, and don't have to flush at all up at the ranch! |
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| 97fishmt Regular Member Joined: 19/04/2010 Location: United StatesPosts: 77 |
65 feet on the tower, it was a challenge because I don't have any level ground. And make it a tilting tower. I was welding through the inverter from the batteries. I brought up 12 2 volt cells to try them out and thought I would put them through some abuse. Now they are all hooked together and I think I need to have two banks. I made it through the winter we'll see how it goes. |
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| 97fishmt Regular Member Joined: 19/04/2010 Location: United StatesPosts: 77 |
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GWatPE Senior Member  Joined: 01/09/2006 Location: AustraliaPosts: 2127 |
Hi 97fish, You have some photos similar to my avatar. It is reassuring when the mill folds in half when designed to. I see 5 wires from the top. I assume there are 4 steel guys, and possibly the AC feed line. Unless the electricals have steel support built in, then the wire should be supported, and not just hanging, especially from 65'. Gordon. PS edit: AHah, I see another wire in other photo, so looks like is more guys still. become more energy aware |
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Bryan1 Guru  Joined: 22/02/2006 Location: AustraliaPosts: 1512 |
G'day to the bloke who lives at 97 fishmountain, that I did get off a FL post ages ago and that your nic is your address. Over here we all like to call a guy 'mate' as one usually forgets a name after a few. But it is bit hard when we aint known ya name in the first place. Okay rant over..... That tower looks like a Rohn one and a bloody good size one too, your gin pole looks less than a 1/3rd of the length so being on the hill either gravity or a decent winch raised it up. I would be interested in the seeing the way you joined the gin pole as I do have a 1/2 tower on the Rohn style beside my shed. All the gin pole is is a 4 metre length of 45 RHS (square tube) with another section welded on @ 90 degrees. A simple guy wire with a turnbuckle bolts onto the tower for a one man job of raising and lowering. I do intend to use the the tower and lower section as one tower and move my 2kw motor conversion to a better wind site. Just with the thin gal tube that makes the tower sorta scares me throwing a 6 metre gin pole to raise a 18 metre tower with a wind genny that weights close to 80 kg's. Cheers Bryan (Ruddycrazy) |
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| 97fishmt Regular Member Joined: 19/04/2010 Location: United StatesPosts: 77 |
Hi Gordon, There are five 3/8" galvanized cables at the top. One is for raising and lowering the tower. It is hooked to a hand winch, or boat winch. It's used to ease the tower plumb when going up and pull it over when going down. I use a grip hoist with 7/16" wire rope for raising and lowering. 
The AC wires are three #1 copper wire, the rigid stuff not multi-stranded, going through a strain relief at the motor and then through a kellems grip and down the center of the tower. I had the wire on hand. I may put larger wire on it someday. Actually there are six #6 copper wires coming out of the motor ( 2 per phase) and soldered to the larger copper wires about 10' down the tower. I needed flexible wire to get into the motor. Thanks for your interest. Mike |
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| 97fishmt Regular Member Joined: 19/04/2010 Location: United StatesPosts: 77 |
Hi Bryan, Yes it is a Rohn 45G. I used the concrete base pad and welded a 5' piece of 4" channel to it http://www.anotherpower.com/gallery/mine The gin pole is 30' of 3" schedule 40. I could only haul 15 foot lengths so I cut two 21' lengths down and welded them together at the mountain with a sleeve inside (2 1/2" with some pipe strapping for shim material for a snug fit) and 3 1/2" outside. I made the gin pole to fold down with the tower so I didn't have to look at it when the tower is down. So using the grip hoist will pull up the gin pole from laying on the tower up to vertical and into the channel. I put a 3/4" bolt through the pole and the channel. Then the gin pole pulls up the tower and it stays horizontal when the tower is up. It works really slick! Mike |
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Dupa Newbie  Joined: 09/12/2009 Location: United StatesPosts: 27 |
I have two Fanucs up and running for almost a year now. They work great. The tag on the motor says 5amp. I get about 20A 12v (pumping into bridge rect) @ about 150rpm and have seen 35amp with good wind gusts. 
I is a injenear |
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| 97fishmt Regular Member Joined: 19/04/2010 Location: United StatesPosts: 77 |
Sweet, so you can really drive em hard huh? I have a couple that say max amps and continuous amps. So I know they are made with heavier windings than they are rated for, and made for abuse. Cool thanks for posting! Mike |
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| birdhouse Regular Member Joined: 27/01/2009 Location: United StatesPosts: 63 |
dupa- we chatted quite a while back. that's amazing that you can get as much as 35 amps out of a 5 amp (rated) motor. i'm starting to wonder if the rated amps on the sticker of the fanucs is the amps per phase?? fanuc also makes some REALLY big DC servo motors. i've never seen one go for cheap though. they always have yellow cases rather than the red for the 3 phase ac units. in fact you (dupa) are the only person i know of with a fanuc mill that's currently flying. this is making me want to finish mine asap! birdhouse i pee more than once before flushing, and don't have to flush at all up at the ranch! |
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| 97fishmt Regular Member Joined: 19/04/2010 Location: United StatesPosts: 77 |
I knew you would like that Adam. Thanks for the pictures Larry any more info? The DC motors from Fanuc are brushed motors. They don't seem to be cheap anymore do they? |
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| birdhouse Regular Member Joined: 27/01/2009 Location: United StatesPosts: 63 |
fish- yea, totally. offtopic question: got some two part epoxy paint for my blades, weldment ect. should i prime the weldment before putting the 2 part on? there isn't any rust, and i'll give it a good wipe-down with acetone before application. adam i pee more than once before flushing, and don't have to flush at all up at the ranch! |
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| 97fishmt Regular Member Joined: 19/04/2010 Location: United StatesPosts: 77 |
I don't know what you mean Adam? Weldment? I painted my truck a couple years ago with a 2 part epoxy paint and yes they told me to use a primer. But for a mill its usually what ever you got. |
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| Dupa Newbie Joined: 09/12/2009 Location: United StatesPosts: 27 |
The Fanucs seem to peg out at 30amp even though rotor speed increases. Not sure why. Birdhouse. I think your right. They may be rated per leg. I have a couple Tagawa servo's 3ph @ 15amp sticker rating that I plan on setting up this summer. I connected one of them to an 8hp gas engine and I can get 50amp max @ 12v even if the rpm increases. I ran it steady one day with it connected to my 2v x 18cell battery bank and it barley got warm after about 30min. They seem to be very robust. One other note regarding the Fanuc. It says 5amp stall. Im assuming this is locked rotor amp draw. Not sure how that translates to capable amprage. I have a totyal of 5 more servos ranging from 7-15amp sticker rating that are just itchin to be spinning by our Michigan wind. Lots of work to get the poles ready. I is a injenear |
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| birdhouse Regular Member Joined: 27/01/2009 Location: United StatesPosts: 63 |
fish- by weldment, i meant all the metal work. like the part that holds the motor, and is the outer half of the yaw bearing, ect. i'm wondering if they wanted you to use primer on your truck because it was already painted? dupa- wow- good test. they do seem to be very robust! interesting thoughts about the amps being rated for the stall condition. that seems to make sense as well. if you are seeing 20 amps out of your 5 amp motor, i wonder if i'll ses 80 amps out of my 20 amp motor?? that would be very exciting, but somehow i'm very doubtful. adam i pee more than once before flushing, and don't have to flush at all up at the ranch! |
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| 97fishmt Regular Member Joined: 19/04/2010 Location: United StatesPosts: 77 |
That's right Larry the tower is all the work. Good testing on the motors. I haven't been able to test em with a gas motor maybe I should set up a battery charger with one. Right now I use a honda 5.5hp and a 100amp 48volt GE alternator at slow speed for 12volt charging. Thanks for the info. Mike |
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| 97fishmt Regular Member Joined: 19/04/2010 Location: United StatesPosts: 77 |
Yep Adam it was to seal what was to be painted. OK, making my motor mount and tower base I just painted with hammerite cyrlon stuff and seems to be holding up. I did spring for some zink coating for the tower bolts but I don't think it was worth it. All I've done will surely outlive me. 
I made a real nice set of blades out of cedar years ago that I used the red oxide primmer on and then lots of enamel they came out super smooth. Wish they didn't get caught in the power wires when coming down once.  and still
spinning. It was a brushed motor no way to stop it. That's why I only go with the 3 phase motors now because you have a brake when you short them out. Keep us updated on your progress. Mike |
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