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vesperhbt
Advanced Member
USA
378 Posts |
 Posted - 01/11/2009 : 6:35:29 PM
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Okay here is the example:
32 Coils would with 22sgw mag wire and a iron core. with 500 windings
size is 1" deep and 2" across with a 1/2" core rotor magnets are .50" x .75" neo magnets
set 1 single pulse set 2 has 2 pulses.
set 1 of 16 coils receives a mag pulse every 19 deg
set 2 of 16 gets 2 receives a mag pulses every 9.5 deg.
Motor revaluations are 2000 rpm
What is the total power output from these slave coils
Can some one help me out with the total power output?
thanks
vesperhbt
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BiDaDiKuNuKu
Advanced Member
Netherlands
310 Posts |
Posted - 02/11/2009 : 12:22:49 AM
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hmmm...just w8 till comwarrior find some time 2 help yah out...he is very good with numbers and formulas...:)
just reading that gimme a headache...hahaha
Peace!
V2DAY
http://www.youtube.com/user/BiDaDiKuNuKu
"1 often meets his destiny on tha road he takes 2 avoid it" |
Edited by - BiDaDiKuNuKu on 02/11/2009 12:23:29 AM |
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vesperhbt
Advanced Member
USA
378 Posts |
Posted - 02/11/2009 : 04:26:38 AM
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Ya I know I have an idea but I need some one with an outside perspective to look it all over. Thank you for your reply
vesperhbt |
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comwarrior
Moderator
United Kingdom
457 Posts |
Posted - 02/11/2009 : 8:11:29 PM
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first of all, if no one else will say it then i will...
OVERKILL! lol
ok, their is only one way to measure how much BEMF your getting...
measure the running volts and amps from the primary battery...
Start with a charge battery same voltage as primarry battery but one thats depleted down to 11 volts when not under load...
Time how long it takes to bring the charge battery upto 13volts...
The capacity of the carge battery is 75% of it's rating. so if it's a 100 amp 12V car battery then you put 75amps into it...
Then, take the amount of charge you've put in and devide it by the time taken in hours (amps per hour)...
next, calculate input watts (Vols X Amps) use average volts and average amps if were talking days of charge time..
Calculate charge power (12V X charge amps per hour) therefor in watts
so, your efficiency would then be... (charge power / input power) X 100
Any questions? PMSL
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Generator Systems Moderator
"Energy can not be created nor distroyed, it can only be changed into other forms" - so lets do some changing!
"Every Action has an equal and opposite re-action" - Why not use the re-action to create an additional action?
95% efficiency, I dare you to do better!
http://www.youtube.com/user/comwarrior69 |
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vesperhbt
Advanced Member
USA
378 Posts |
Posted - 03/11/2009 : 05:20:21 AM
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Yes I can see how that would yield the results as well But I would like to come up with a better formula for deciding how to make coils and how many to use.
In my vision there should be a constant variable for a coil, meaning that at 1 magnetic passover makes "W" 1 winding at the "X" length of the bobbin to create "Y" voltage at "Z" amps.
SO to figure this out would take a formula like:
At "X" length of wire at "Y" size will produce the "Z" voltage at said amps.
So to figure this out means winding one wrapping on a bobbin at say 1" counting the turns and also the length of wire used. Then have a magnet pass in front of the core and measure the pulse for volts and amps. then all that one would need to do is take that answer and back divide this onto the wire length.
This should provide a basic formula for how much wire would be necessary for a said amount of power output desired?
Does that make any sense at all? |
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comwarrior
Moderator
United Kingdom
457 Posts |
Posted - 03/11/2009 : 11:53:33 PM
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Theirs problems with your idea...
Spanner 1)
Magnetic density of the coil core and it's efficiency to translate the magnetic field to the magnet...
Spanner 2)
Flux field strenght of the magnet passing the core
Spanner 3)
the ferther the wire is from the core (multi layers) the less efficient it becomes
you can calculate the curent that will be drawn by a drive coil using ohms law, but all that goes out the window when you pass a magnet by the core...
I have / had a LARGE excel spreadsheet with wire sizes, core sizes etc as a guestimate based on two wire sizes use with the same magnets on the same size spool at the same RPM with the same number of winds...
unfortunatly, you have to use 3 wire sizes you get a partial 'curve' on a graph and then use maths and a efficiency guestimate to guesti-calc the output voltage and current...
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Generator Systems Moderator
"Energy can not be created nor distroyed, it can only be changed into other forms" - so lets do some changing!
"Every Action has an equal and opposite re-action" - Why not use the re-action to create an additional action?
95% efficiency, I dare you to do better!
http://www.youtube.com/user/comwarrior69 |
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vesperhbt
Advanced Member
USA
378 Posts |
Posted - 04/11/2009 : 05:44:57 AM
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Thank you CW Well I can see how that is all the variables in this calculation.
guess it will come down to making a coil at full scale and testing it.
vesperhbt |
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Coil max power total help please?
