How to Wind a Bifilar Coil

(c) 2007 Blue Mountains Energy Research Centre, Sydney, Australia
www.bmerc.com.au

Category:

Howto & Style

Tags:

• coil
• bifilar
• ssg
• bedini
• diy

[bmerc04]

@pkrska In my experience the performance difference between a "messy" wind and a "neat" wind is negligable.

[78chuck]

Aren't these two coils supposed to be wound at a ratio?

[bmerc04]

@78chuck You mean "aren't these 2 wires supposed to be wound with a ratio in mind"? You may be referring to Litz wires. Please see my response to usedbandage9

[abpccpba]

In some of my research in coil winding I found that if one touchs the wire that in time the acid remaining on the wire will brake down the insulation and make your coil useless.

[bmerc04]

@abpccpba Thanks for your comment. I've not found this to be true so far. Some of my coils are several years old. Their impedance remains pretty much the same today as when I wound the coils. But what you say might be true (it makes sense as we all generally have a very thin layer of acidic coating on our skin). So perhaps I'll use cotton gloves when winding my coils. Once the protective black electrical tape is wound on then I don't have to worry about acid from my fingers.

[usedbandage9]

Does it make a difference whether the wires are twisted or in parallel? If so, which one would make the wheel spin faster?

[bmerc04]

@usedbandage9 Thanks for your comment. For my Bedini projects a parallel winding works just fine. Twisting the 2 wires together *before* they are wound onto the spool is called Litz (lookup LITZ in Wikipedia for more info). In Bedini replication circles, there seems to be some debate about whether or not twisting your wires before winding on to your spool is more effective. Some say yes, others say no. I've not tried to determine if there is any impact in my projects.

[Jetijs]

Nice video. :)

Maybe make also a video about how you make the core of the coil and how you hold the electrodes in the core together in place. :)

[OriginalMusicaster]

thank you for the info

[bmerc04]

@freeenergy4everyone Toroid coils can be bifilar - yes. For my application (Bedini replications) I just need a bifilar coil as I've demonstrated.

[bmerc04]

@serialkissersband It all depends on your application. If you are thinking of a Tesla coil then no, bifilar windings are not designed for that application.

[bmerc04]

@john29302 Thanks for you comment. Bifilar coils are not for every project that requires a coil. Some projects require just a single wire coil, some require a 2 wire coil (bifilar), and some require a 3 wire winding (trifilar). Bifilar coils can be used when you need a transformer-like arrangement in the one coil (energy down one winding gets converted/shunted to the 2nd winding). I use my bifilar coils for various Bedini projects.

[bmerc04]

@KyleCarrington Thanks for your comment. Correct. Yes, the second "layer" goes over the top of the first layer as you continue to wind (it's impossible for it to happen any other way).