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VK4AYQ
Guru
Joined: 02/12/2009
Location: AustraliaPosts: 2539 |
| Posted: 05:01am 20 Jul 2011 |
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Hi Vic and Phil
Some good wind again today
All the best
Bob
Foolin Around |
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norcold
Guru
Joined: 06/02/2011
Location: AustraliaPosts: 670 |
| Posted: 08:48am 20 Jul 2011 |
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Phill,
The blades were screaming , I unloaded completely had made measurment without being connected to rect or doubler. One thing I know from your logging is my site is a much better wind site than I`d realised and that is a big plus. Will contact youy re logger should I not get my head around the Altronic one. Being self contained with a SD card it should be more convenient. Presently have a lot going on here thus will be leaving mills & logger on the backburner.
Many Thanks for that now I have something to go by.
We come from the land downunder.
Vic |
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VK4AYQ
Guru
Joined: 02/12/2009
Location: AustraliaPosts: 2539 |
| Posted: 02:53pm 20 Jul 2011 |
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Hi Vic
Wind for the day 20th july
A good day should be more like this
Bob
Foolin Around |
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norcold
Guru
Joined: 06/02/2011
Location: AustraliaPosts: 670 |
| Posted: 06:10am 21 Jul 2011 |
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Bob,
It has been a good windy year up here, lovely clear winter days. I think the weather has reverted to being similar to the 70-80`s. Considering this years long wet. Have been following the protest over the proposed wind turbines at Mt.Emerald. A good proportion of the protesters are from down south came up here and inland to enjoy the peace. Have a feeling from contact with a few that they are green voters, think we may see some division in the greens over such issues in the future. Of course some of the protesters are local "red necks" of which I can proudly claim to be(though not a protester). Interesting times, have a feeling the greens will get torn apart from within such as happened to the "keep the bastards honest" democrats.
We come from the land downunder.
Vic |
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VK4AYQ
Guru
Joined: 02/12/2009
Location: AustraliaPosts: 2539 |
| Posted: 11:30am 21 Jul 2011 |
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Hi Vic
A lot of these people do their bit just to get some sort of recognition in their group. there are so many different approaches to conservation that it attracts all sorts of smart and weird people. One thing I have noticed is they all go to an idealistic life style place and then encourage their friends to go their to and eventually it is the same as where they left, Paradise Lost again.
This is global warming and it is the coldest winter I have had here in 30 years. Maybe some of the smart ones stood on their heads while reading the thermometer.
All the best
Bob
Foolin Around |
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norcold
Guru
Joined: 06/02/2011
Location: AustraliaPosts: 670 |
| Posted: 07:04pm 06 Aug 2011 |
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Just got home from a 2 week backpacking trek down 50k of a rugged inaccessable part of our local river. 3 old farts and a 46yr old. Bank manager, public serpent manager,retired farmer & feral(me). Each carried a 30kg backpack(food,clothes,wine,rum,etc). Magic trip but I`m bloody sore. Some bloody interesting conversations re. climate change and public serpents. With very interesting view from public serpent.(He had a bit of a chuckle about the public serpent title of yours Bob, said he`s going to put that title up on his office door)
Found another 3phase rectifier fried on OEM, as the Jaycar doesn`t seem to have these problems am starting to think perhaps the higher frequency may be causing these problems rather than my experiments weakening them. Have you folks had any such problems? Rectifiers were the ones came with OEM`s, but have been using cheaper 30amp non Al heat exchange ones on Jaycar(bolted with thermal paste to Al enclosure)Will be trialling these on the OEM`s and perhaps bridge rectifiers. Has anyone trialled the Cockcroft-Walton multiplier rather than Gordon`s version?
We come from the land downunder.
Vic |
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VK4AYQ
Guru
Joined: 02/12/2009
Location: AustraliaPosts: 2539 |
| Posted: 03:56am 07 Aug 2011 |
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Hi Vic
Sounds like fun and games for you all, but the big question is there any less fish in the river now?
On the rectifier situation I use the heavy duty 100 amp 1000 volt unit that phill has for the main rectifier and the original one for the boost circuit, mind you I have none fail but only 24 volts may not be such a strain. Haven't heard of the other doubler.
All the best
Bob
Foolin Around |
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norcold
Guru
Joined: 06/02/2011
Location: AustraliaPosts: 670 |
| Posted: 07:15am 21 Oct 2011 |
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Have been running with 100amp 3Phase rectifiers for a few weeks. Seems to have solved the overheating rectifier problems I was having. They run much cooler output does not seem to have increased any noticable amount.
Also made and trialled a Colcoft-Walton Multiplier as per REUK, no success it loaded the mill up you could count the revs by eye with DC output(no load just multimeter) at 62volts, AC current across one phase was 1.4amps, no heat so don`t know where the power was going but it definately multiplied the voltage. For comparision checked AC current with doubler(Gordons) no load just multimeter reading 60vDC and mill flying, AC current was zero.
With a mini-flood and bloody high winds up here couldn`t go fishing so played around with the above project. Achieved nothing other than now I know it ain`t the way.
Am now logging output on mills with SC logger, am wondering what calculation I could use to achieve revs the OEM`s are doing by sensing AC frequency with a hall effect sensor. Must be able to calclate taking into consideration the number of coils.Any ideas out there? Read the 4M was doing such with the Fisher&Parcel but could not find info about how the calculation was arrived at.
We come from the land downunder.
Vic |
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daveames
Newbie
Joined: 19/09/2009
Location: United StatesPosts: 30 |
| Posted: 08:19am 21 Oct 2011 |
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Hey Vic,
Fun stuff! 
Afraid I know nothing about that "SC" logger, but a simple paper chart could be worked up with frequency to RPM conversion of: Hertz/pole pairs*60 seconds = RPM
46 magnet poles =23 pole pairs
sample:
280Hz/23 = 12.17
12.17*60 = 730 RPM
Following along in the shadows.
Cheers, Dave |
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VK4AYQ
Guru
Joined: 02/12/2009
Location: AustraliaPosts: 2539 |
| Posted: 08:43am 21 Oct 2011 |
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Hi Vic
Good to hear the 3 phase rectifier is working well for you, I found they are the way to go as the seperate bridges have a tolerance problem.
In regard to the frequency I have found the cycles per rev equals half the number of magnets not the coils so counting the number of cycles per minuet divided by cycles per rev gives rpm. This will depend on how you configure your logger.
I think it has 48 magnets in total and that means 24 cycles per revolution, I did check it with a frequency meter but all the info is lost in the computer that died in the storm, lucky it didn't blow my backup hard drive with the pictures on it.
You should be able to pick up across a phase with a high resistance voltage divider. might need a diode in series to get a pulse if it wont read ac.
Sounds like a reprieve for the Barra for the moment.
I have tried the boost module on my mill and it boosts to 60 volts no problems that is on delta setup for 24 volts, it was doing 3 amps in 5.5 MS wind, I think it would go to 5 amps if the wind was higher, it was a hay wire set up into 48 volt batteries, as a temporarily test, as I am putting up one with 48 volt system when I can afford some more panels. There was a small current loss in the unit of 50 MA not enough to worry about.
all the best
Bob
Foolin Around |
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norcold
Guru
Joined: 06/02/2011
Location: AustraliaPosts: 670 |
| Posted: 07:43pm 21 Oct 2011 |
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The SC logger (Silicon Chip mag kit sold by Altronics of Oz) has maths functions in its scripts thus should be able to configure now with Daves and Bobs info. Will get back with info once I incorporate info into script successfully, will take awhile tis still all foreign to me but an enjoyable challenge.
Many Thanks
We come from the land downunder.
Vic |
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