several coils in parallel or a single one ?

Hello, My name is Tristan, I am actually working on a project that requires one magnet to travel through a tube. Around this tube, I will wind some enameled wire to create a coil. The results so far are really weak, and I have to put this system in a pre-exising system. My question today is: If I have enough space to put 6 layers of coils, shall I just use one wire and roll it back and forth until 6 layers (assimillable as 3 coils of two-layer thick in series)? Or shall I create 3 different coils (of 2 layers each) on the top of the other, and then connect them parallel? In the first solution, the resistance in the only coil is quite high as only one wire is used. Thus the final force would be quite low as the intensity would be low: F = (n x i)2 x magnetic constant x a / (2 x g2) (n is the number of turn and I is the intensity). If I connect 3 coils in parallel the intensity would increase drastically and thus create a higher force in theory. Is it correct?



by TitouV
May 12, 2018

Hi Tristan, yes that sounds right. But is it field or is it Fleming's left hand working for you? And have a look at the magnet field lines, is one pole working for and one against? Make sure your power supply can give enough current, if not then use suitably rated capacitors to supply the current. Hope this helps, mike.

by mikerogerswsm
May 13, 2018

Hmm...Good answer...It would be helpful for the people those who are trying to understand about coils...Keep posting

by kumarpradeep
May 28, 2018

Several coils must be in single or parallel is a very vital question. So to get the exact answer and the description anyon can visit our site for further information,

by ramd2530
June 12, 2018

2 Answers

Answer by Foxx

I may or may not fully understand your question. If you are looking for a given number of ampere turns the coils can be connected in either series or parallel. The difference comes in the power supply requirement. If you have 6 coils and a single coil requires "v" volts to get "i" amps then if you connect them in series the power supply must be capable of supplying 6 X v volts and i amps. If you connect them in parallel the power supply must be capable of supplying v volts and 6 X i amps. It's that simple. Just be careful to get all coils connected the same polarity in each case so that the fields add up.

+1 vote
by Foxx
May 28, 2018

Answer by TitouV

Hello, thank you so much your answers ! It helped me to rethink my plan (I changed my mind about the disposition of the coils), In order to make it easier to explain the true purpose of it despite my questionable english, I will explain the whole project, I am making a kind of linear motor, with coils stacked right next to each other. What for ? My first hobby being airsoft (same concept as paintball), I am making a system that would move a piston head back and forth in a cylinder, on the other end lf the cylinder, a plastic projectile will be pushed down a barrel because of the air moved by the piston on the other end of the cylinder. The plan here, is to screw the piston head to a shaft. This shaft will have some magnets attaches at the other end. These magnets would slide in an other tube where coils would be winded around. (Very similar to a linear motor, I know the force required that has to be applied to the piston assembly ~5N/cm. Anyway, if this does not make any sense (at least for me it doesn't hahaha), there is a video of the concept that I have done. Values about the coil requirements are given after 10 minutes of the video: I totally understand that this project only purpose is for a "niche". However it really is important for me and I would like to see it working properly, hence my post here. Thank you for your time, I am looking forward to hearing from you.

Ps: there is a previous prototype working but not efficient at all. (One coil not deploying enough force:

+1 vote
by TitouV
June 05, 2018

Interesting vid but two errors. 1. Having an aluminium tube is going to cause eddy currents and reduce performance. 2. Look where the flux lines go - remember it is a Flemings Left Hand Rule machine.

by mikerogerswsm
June 05, 2018

Try googling "Rail Gun". It looks to me like your project might be done with a micro micro version of a rail gun. The original was to launch super high speed projectiles, possibly into orbit and required a million amps or so--but you won't need that.

by Foxx
June 07, 2018

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