Help

[Michael A.]

Hi can someone help me with a small problem, I am making a hand crank generator and I am not sure how to wire the stator for DC output I tried series but that did not work. I have all North magnets on one side and all South magnets on the other side. My stator has 8 coils and each have a start wire and a finish wire Here is a picture

[WaltzCee]

You should maybe google it. When I did it seem like you might need some diodes and
a capacitor.

[Michael A.]

thanks for your reply Walt, to use diodes means I would first have alternating current. I have made many disc alternators. for battery charging pure DC current is the best. So a disc generator would be the way to go.

[Tarsier79]

Hi Michael

I am an electronics technician. I have not wound coils a small as you might like, but:

Your current coming from the coils will be alternating regardless of magnet orientation and coil winding directions etc. You could make it pulsing DC, but it would require the opposite of a DC motor, IE brushes and a split contact (a manual diode) It is easier just to use a diode (or bridge rectifier).

To get the greatest voltage difference in your windings, it is best to have alternating poles on the magnets.

You can create a Bedini charger. That is quite fun, but not OU in my opinion. My advise is just scale down the Bedini coil to suit your project. There are heaps of videos and instructions online. Basically use a ferrite core and wind wire around it.

Depending on how you wire it, you may need one or more protection diodes.

[Michael A.]

Thank you Tarsier: I have made many disc alternators, but as you know the best way to charge batteries is to use pure DC current. I have a project that I am working on, that uses supercaps and I want to charge them directly from a disc generator.

[Tarsier79]

Like I said, it is a bit difficult to build a DC generator. Just having the magnets in one direction will not do it.

[Art]

I'm not sure whether I like this guys diesel motor driven flywheel or his neodymium magnets the most .

If Bessler's wheel can't be made to put out the oomph maybe we cqn augment the power with an auxiliary diesel engine ! : )

https://www.youtube.com/watch?v=l8PxXZoHTVU

[daanopperman]

Hi Michael A

If you make a coil with a volt meter connected to it , and
move a magnet passed the coil the meter will first show a reading in either positive as the magnet approaches and negative as the magnet reseeds or visa versa. A oscilloscope will show a full wave .

In your magnet setup , as the magnets move past the coils , one magnet is approaching while the one magnet is reseeding on the same coil , this will prevent any flow of electrons , and instead the coils will just heat up .

What you need is alternating N S magnetic fields .

According to the left hand rule , if the windings is wound in the direction of your fingers your thumb will point in the direction of electron flow .

If you place the magnets in N S orientation , as the one magnet approaches the coil it will " push " then the reseeding magnet will have the same direction " pull " of the electrons trough the coils . This is however alternating current . The plus point of this means of generating electricity is that you use all of the magnetic field induction , as opposed to D C where you only use a part of the induction.

To make a DC generator you need to make a mechanical or electric switch that will allow only a part of induction of the coil , like the coil will only allow / use the approaching magnetic field but not the reseeding magnetic field . This will give you a pulsing DC voltage witch can be filtered with a choke , caps and rectifiers / diodes .

After changing the magnets on your alternator you have to connect (be sure the coils are all fitted with the same winding orientation ) the coil No 1 start wire as your first lead out , the end of that coil will connect to the start of the second coil and the end of that coil will connect to the start of the 3rd coil, the end of the 8th coil will be your last lead out . The start wire from the first coil and the end wire of the 8th coil will be your current collector wires . There is no positive or negative wirers as it is alternating current . This will be a single phase alternator . There is 4 pins on a full bridge rectifier , 2 for the alt in and 2 for d.c. out . The two leads will go to a full wave bridge rectifier witch will give you a d.c. output . If you want to charge batteries you can use it as is , but for electronics it will have to be little bit more pure , for your use the batteries will ensure it be 100% d.c.

A alternator will give 2 times the energy as to a dc generator .

hope it helps .

Daan