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Whats the Normal Guild Line for AC Volts for each Coil
By wayne, Section Homebrewed Electricity Posted on Tue Feb 24, 2004 at 10:23:28 AM MST
Whats the Normal Guild Line for AC Volts for each Coil

Hi
The past week I have been winding coils and doing what everyone says. I get on a average for my coils .5v AC for each one. Then as I connect more in series it does go up. I am winding approx 60-70 turns of # 22 wire on 1.25" O.D total. with open center. Is this good or should it be more. If I wanted 14v I would have to use 28 coils or more. am I in the ball park?
Thks
Wayne

Whats the Normal Guild Line for AC Volts for each Coil | 3 comments (3 topical)

Re: Whats the Normal Guild Line for AC Volts for e (none / 0) (#1)
by DanB on Tue Feb 24, 2004 at 11:15:58 AM MST

Hi Wayne -
Here are some things to consider... (and there are certainly still more)

Voltage is directly related to rpm. So when you say .5 volts per coil.. you should also consider rpm.

Its also directly related to the strength of the magnetic field. So a stronger field (smaller airgap or bigger magnets) will result in higher voltage per coil.

And of course, coil size, shape - and placement is important.

You can either build your alternator and then try to make a prop that matches it - or figure about how big your prop will be, and how fast it should go. Also - if you intend to build a certain size prop, the alternator not only has to start charging at the proper speed (certain number of volts/rpm) but it must also be powerful enough to handle the sorts of power you would expect from such sized prop.

Re: Whats the Normal Guild Line for AC Volts for e (none / 0) (#2)
by wayne on Tue Feb 24, 2004 at 11:38:40 AM MST

I forgot I was using 7.4v D.C drill at full speed. I don't know what RPM this is but assume its about 300RPM. But just guessing here. I did find out the placement is very important and distance is too. I have lots to learn.

Thks
Wayne

[ Parent ]

Re: Whats the Normal Guild Line for AC Volts for e (none / 0) (#3)
by Norm on Tue Feb 24, 2004 at 03:05:43 PM MST

Wayne if you want a more accurate way of measuring the rpm of something.
Here is a quick and easy way to measure the rpm...
Get a piece of threaded 1/4 inch rod.(20 threads per inch). Put the rod in your drill, a nut at the other end of the rod, turn on the drill...grasp the nut...count to 10 seconds let go of the nut and stop the drill. now you can measure the inches/threads traveled (20 threads per inch) and 6 times that gives you the rpm. The nut will travel 15.6 inches for a 1875 rpm motor...about 2.5 inches for 300 rpm.
Then of course the drill might be going a little slower under load....but it's still more accurate than guessing or assuming....
Have fun !
( :>) Norm.

( :>) Norm
[ Parent ]

Whats the Normal Guild Line for AC Volts for each Coil | 3 comments (3 topical)

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