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Old 11-30-2013, 12:08 PM #1
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Default Do magnets interfere with drivers?

I bought a flat top 18650 batt and it only makes contact inside one of my lasers if I add a small Nd magnet to the + pole.

This laser is case negative, which takes the magnet very close to the driver. Close enough that it gets slightly attracted towards the pill. I'm wondering if this could interfere with the driver because of the inductor.


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Old 11-30-2013, 02:50 PM #2
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Default Re: Do magnets interfere with drivers?

As far as I know, it shouldn't. Magnetic fields are additive, so if there is an additional, ambient magnetic field, it's just like adding a constant to a function and taking the derivative of it. It won't make a difference. Inductors only care about changing magnetic fields and/or changing currents. Since your magnetic is stationary, it shouldn't cause any problems.
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Old 11-30-2013, 03:27 PM #3
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Default Re: Do magnets interfere with drivers?

Bend the spring out to make it longer instead, or at least use a piece of metal. Magnets are not ideal conductors.
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Old 11-30-2013, 03:29 PM #4
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Default Re: Do magnets interfere with drivers?

Have you tried using a blob of solder instead of a magnet?
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Old 11-30-2013, 05:02 PM #5
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Default Re: Do magnets interfere with drivers?

+1 on the soldier blob, I have had some bad experiences with magnets including a magnet shifting and touching the (-) case, shorting out the battery. Scary stuff!
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Old 11-30-2013, 05:06 PM #6
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Default Re: Do magnets interfere with drivers?

^^ thanks man.

I went as far as using a nice sized solder blob, and filing it to a flat button top for a good connection. Works great, no worries about magnet problems. Didnt think about a shifting issue. Another reason for solder.
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Old 11-30-2013, 07:12 PM #7
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Default Re: Do magnets interfere with drivers?

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Originally Posted by ryansoh3 View Post
+1 on the soldier blob, I have had some bad experiences with magnets including a magnet shifting and touching the (-) case, shorting out the battery. Scary stuff!
We use a soldered button on our cells.



It is shorter in overall length . . .

and has lower resistance for better power.

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Old 11-30-2013, 07:20 PM #8
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Default Re: Do magnets interfere with drivers?

I'll try the solder. Any tips on getting it to stick? Do I heat up the + pole first?
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Old 11-30-2013, 07:23 PM #9
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Default Re: Do magnets interfere with drivers?

Dab some solder on the iron, apply some flux on the + side (optional), touch the + side with the iron for 1.0 second, and feed some solder onto the + side when the iron supplies the heat.
It should all happen very briefly in less than 5 seconds to keep the cell from getting roasted. Good luck!
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Old 11-30-2013, 07:30 PM #10
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Default Re: Do magnets interfere with drivers?

If you have any sticking problems just rough up the pole a bit.
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Old 11-30-2013, 11:58 PM #11
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Default Re: Do magnets interfere with drivers?

Quote:
Originally Posted by Wolfman29 View Post
As far as I know, it shouldn't. Magnetic fields are additive, so if there is an additional, ambient magnetic field, it's just like adding a constant to a function and taking the derivative of it. It won't make a difference. Inductors only care about changing magnetic fields and/or changing currents. Since your magnetic is stationary, it shouldn't cause any problems.
I dont understand your calculus analogy! Wait perhaps i do, please correct me if i misunderstand?

So the inductor in the driver is producing some magnetic field, which actually varies. so there is some flux, or the rate of change of the magnetic field density with respect to time.

Adding some constant magnetic field will not effect the overall CHANGE in the magnetic field, as the function of the entire varying field has simply been phase shifted up the y-axis.

So the derivative of this function will not change, since each point in the graph will be shifted up the same amount, therefore, of course, the slope tangents would remain unaffected.

Yes? Thanks! I'm glad im not the only one who likes math.
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Old 12-04-2013, 07:38 PM #12
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Default Re: Do magnets interfere with drivers?

Patent US6710693 - Inductor component containing permanent magnet for magnetic bias and method ... - Google Patents

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