Winding Direction Consideration (Proper Winding)

[mheruian]

Hello,

I'm boy who suddenly been strucked by curiosity on how hand crank generator works and i watch and read some of how to create one, specially this one on youtube:



and i want to create one but i don't have a 3D printer, but i saw some alternative but as i do/design my own coil based on what i watched and read, it came to my mind how many winding works. I understand straight-forward winding from left to right but these where the two things that many videos and tutorials didn't mention about:

1) starting left to right then after reaching end of the core, right to left winding
2) starting left to right then after reaching end of the core, jump to left to wind right again
3) starting left to right but before reaching right, a lot of times doing right to left then left to right then right to left and left to right until reaching end of the core.

- doesn't these effect the direction of magnetic field, etc? any drawbacks or setbacks with these?
also, images below show what I am doing, please help me if this thing would work or not. No one around here could help me with this kind of stuffs personally

The coil will be like the toroidals so windings will be upright horizontal in circle.

Above where the questions i want to know
And if the image below can be done using coil winded up vertically instead the toroidal

My setup:

where i will place my toroidal winding (2mm plastic core at the center)

Thanks for those who would help I'm not a genius but i want to learn and have fun.

 

[anorlunda]

Great project. There are several members who can help.

First, let me ask. What is your definition of success for your project? Perhaps to light a LED light? Measure a voltage on a voltmeter?

 

[mheruian]

Great project. There are several members who can help.

First, let me ask. What is your definition of success for your project? Perhaps to light a LED light? Measure a voltage on a voltmeter?

Hi Mr. anorlunda,

Thanks a lot for the reply to light an LED is great but i want it to be a charger in the future like using the super capacitor, bridge rectifiers and charging circuit (android, iphone, etc. 5v devices). I ordered online neodymium magnets that are 10mm in diameter 4mm in height as well the coils so for now so i can't measure its voltage, i am at designing while waiting for my orders. I want t verify first before the items comes up for me to know what to do as much as possible.

BTW, the DIY on the youtube video is hand grip activated, mine is rotated by a shaft - because i don't have 3D printer and I'm not good at crafting or sculpting such frame and gear work

 

[anorlunda]

I'm glad I asked because the difficulty goes up rapidly with the amount of power you need.

I like your approach. PF members might also be able to advise you on how to measure the performance of what you have.

How do you plan to rotate the shaft? Perhaps attaching it to a bicycle.

 

[mheruian]

I'm glad I asked because the difficulty goes up rapidly with the amount of power you need.

I like your approach. PF members might also be able to advise you on how to measure the performance of what you have.

How do you plan to rotate the shaft? Perhaps attaching it to a bicycle.

Thanks again for the response :D Mr. Anorlunda, i really appreciate it.

uhm for now, i just want it hand crank so by hand. For me, attaching it to a bicycle will be very hard. I'm no mechanic tinker yet hehe.

So what do you think about my 3 questions regarding winding directions? do magnetic fields cancel out when coil is winded stacked up a lot of time from left to right and vice versa? any technical or theoretical means here?

 

[anorlunda]

I'm not the right one to answer those.

Ping @jim hardy , @berkeman , @Baluncore , @Tom G , and others. Can we help this young person?

 

[jim hardy]

these where the two things that many videos and tutorials didn't mention about:

1) starting left to right then after reaching end of the core, right to left winding
2) starting left to right then after reaching end of the core, jump to left to wind right again
3) starting left to right but before reaching right, a lot of times doing right to left then left to right then right to left and left to right until reaching end of the core.

- doesn't these effect the direction of magnetic field, etc? any drawbacks or setbacks with these?

No. Those won't have much effect. You could wind the coil random or layered and it won't change things very much at all.
What IS important is that when you view your coil from one end all your turns go the same way, either clockwise or counterclockwise.


The first thing to remember is Faraday's Law. It states that voltage will be induced in a conductor(wire) that encircles a changing flux.
That's why in your video they wound their coil on a form and placed a bolt through its center.
Flux leaves the magnet, goes through the center of the coil and returns around its outside back to the magnet.

Since the turns of the coil encircle magnetic flux that changes direction as each magnet passes by they will experience induction, that is they will produce voltage when the wheel turns.

Now if you surround your wheel instead with a toroid there's not really any flux flowing around its middle so you will get voltage only by accident.

So adjust your thinking to visualize first where the magnetic flux goes, then how to make your turns surround it.

I'd suggest you buy one and take it apart to see how it works. Google's first hit for me:
https://www.emergencykits.com/emerg.../led-flashlights/hand-squeeze-led-flashlight/

old jim