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Forum Index : Windmills : Fisher & Paykel W/M
| Author | Message | ||||
| toxsickcity Newbie  Joined: 28/05/2011 Location: AustraliaPosts: 8 |
Hello, I am a noob, and I have a question about wiring for the F&P Motor I am so confused Pages 7,8,9 http://www.sustainability.ofm.uwa.edu.au/__data/page/83884/F P.pdf because I am looking at 2 websites and a GRAPH of output power is always great. can anyone comment on the graph to state if it's realish? I will buy a .8mm motor and want to wire it based on 80SP on photo I attached tho requires 280 RPM I want to use for a VAWT where I believe the RPM would be lower I guess around 100-400rpm in extreme I want to know what is best wiring to setup ------------ IS "split into two", so we end up with 2 times 7 coils in series. Best suited to 48 volts or 24 volts in low winds. Using our naming scheme, this would be a 2X7C can anyone comment on RPM/AMP/Volts I have a 24v battery system Thanks for helping.. Shaun |
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| VK4AYQ Guru  Joined: 02/12/2009 Location: AustraliaPosts: 2539 |
Hi Toxsickcity You would need a step up gearing to work a F&P on a VAWT depending on the design and size of your machine, between 3 and 5 to 1 ratio. All the best Bob Foolin Around |
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fillm Guru Joined: 10/02/2007 Location: AustraliaPosts: 730 |
Hi Shaun, If you are wanting low rpms power output I would be using the 60S or 80s stator unmodified. A 60s would start to cut in around 30rpm @ 24V from memory and probably output no more than 250W which would not load a small VAWT excessivly. I would also recomend twisting the poles or going to the 7 phase conversion to reduse the cogging . To attach pics ect you have to download them using the "image upload" 2nd from RHT PhillM ...Oz Wind Engineering..Wind Turbine Kits 500W - 5000W ~ F&P Dual Kits ~ GOE222Blades- Voltage Control Parts ------- Tower kits |
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| Air Bender Senior Member  Joined: 25/01/2011 Location: AustraliaPosts: 206 |
Hi Shaun If your are going to run an 80s and want to get 24v in light winds Fillm is right you probably need to run the stator unmodified. I am running 80s series stator unmodified on what is an undersized vawt for the F/P. My mill is set up to cut in at 12 volts. I can only guess at the rpms needed to reach certain voltage outputs but i would guess that you would need around 120rpm or more to get the unmodified 80s up above 24V and that is not that easy to acheive with a vawt in light winds. As Bob said it depends alot on the size and design of your machine. All the best Dean. |
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Greenbelt Guru Joined: 11/01/2009 Location: United StatesPosts: 566 |
HI Shaun, I looked at the Graph posted at the university and from what I see in the pages of this Forum it looks to be "Realish" The different model F & P's Have very wide characteristics when used as a Alternator. What they don't show is the Hardware needed to get the rpm or Torque required to output a Kilowatt. (Phil M, 2 post's above this one,) Is one of the top authority members on F&P's He Has built lots of em. Welcome to the Forum. 
Here is a little help using the post format buttons Cheers---Roe 
Time has proven that I am blind to the Obvious, some of the above may be True? |
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| toxsickcity Newbie Joined: 28/05/2011 Location: AustraliaPosts: 8 |
what do you mean by twisting the poles? I also will most likely de-cog it.. use a file and smoothen to a rounded edge for each coil 250W sound nice, tho I am worried about that graph showing only less then 100W at full speed for series Lastly Ideas on protecting from high speed rotation incase it happens. as in series (unmodified) would mean I would get volts as high 150v? |
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| Greenbelt Guru Joined: 11/01/2009 Location: United StatesPosts: 566 |
Shaun, I did some homework for you,,Scroll down about a third page you will see decoging Cheers-----Roe How to twist the poles Time has proven that I am blind to the Obvious, some of the above may be True? |
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| toxsickcity Newbie Joined: 28/05/2011 Location: AustraliaPosts: 8 |
much thanks I didnt know it was part of DECOG.. sounded electrical... |
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| brucedownunder2 Guru Joined: 14/09/2005 Location: AustraliaPosts: 1548 |
Hi Roe,, Just a clue that I use .. When I want to re-visit a posting or find out about a particular item, how to do something, Etc,, I just go the "Search" box at the top of the page and fill it in and sometimes 10 or more postings will come up about that subject .. I've been here for yonks, and still enjoy browsing back through the postings.. Sometimes up to an hour or more .. Cheers with your building ... Bruce Bushboy |
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| Air Bender Senior Member Joined: 25/01/2011 Location: AustraliaPosts: 206 |
Hi Shaun The problems you you are hitting on with the different voltage outputs between low and high winds i beleive is a universal one and not easy to solve. One thing is that when your mill gets to cut in speed (the voltage your batterys are at) a load will come onto the alternator and it will take quite a bit more wind to push the rpms up past this point. So the size and torqe of your mill makes a differnce here. I have pivoting wings on my vawt, centrifical force at high rpms push the wings to an angle where they become inefficient which helps as well. (Centrifical force on a vawt can be used to advantage). My take on this is to try to build my mill to reach higher rpms in light winds by increasing the size and lift of my wings and then restricting the speed in high winds. I have a very low cut in speed running the 80s unmodified but so far even in the strongest winds over the larst 6 months i havnt seen the voltage output get much over 60 volts. I would love to rewire the 80s to 2/7 or run the 100s I have but to do this i need to get my rpms up in light winds or only having it producing power during stronger winds. I hope this helps Dean. |
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| VK4AYQ Guru Joined: 02/12/2009 Location: AustraliaPosts: 2539 |
Hi Shawn & Dean I wonder if the system I have used might help you, I run my generator in Delta as that is 25% or so more efficient and use two boost modules to get the lower end power. The smaller one cuts in at 5 volts and is rated at 3 amps The larger one cuts in a t 10 volts and produces 9 amps both at 27.5 volts to charge 24 volt battery bank. When the wind picks up the voltage across the main rectifier rises to 27.5 volts and as the modules have equal voltage input to output they cease to conduct and the main rectifier takes over. This is on one of phills Mills with 2.8 meter blades. With this setup I am getting power from 2 ms up and while th low end is small it adds up. In gusty weather you can see the transitioning between boosters and main rectifier. As there are heaps of torque from a VAWT I think it would work in your case, just do the windings for your charge voltage and pick up lower voltages in the boost modules. Keep them in delta for maximum efficiency. Just a suggestion. All the best Bob Foolin Around |
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