ES Magnet Zapper: design & usefullness?

Thud

Thud

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Aug 20, 2009
Messages
2,690
Location
West Michigan,USA
Histor:
Back in the RC racing days, the local club purchaed a "motor zapper" for 540 sized motors & charged a couple bucks to re-energize & align the magnets in the motors. (cheap ceramic I believe)
On well abused stock motors we could instantly see a difreance.

Discusion questions:
Are neo magnets that have been weakened by heat & abuse subjet to the re-energizing effect of a strong ellectro-magnetic burst?

Can neo magnet poles be re-oriented?
Perhpas for better optimazation of flux pathes or even Halbach arrays? (from realtivly cheap standard offerings)

looking into this this morning, I found a little pdf regarging the "charging" of raw magnets. the circitry looks simple enough & I am curious to see if there is any interest in this.
View attachment magnetizing.pdf

I would think a reasonable sized zapper could be built for experimantation with a little help from the design wizzards here on the sphere. I have the mechanical skills to fabricate the shoes & odd parts for such a machine
the ellectrial side of things like capacitor sizing & even some calaulations on ellectro-magnet coil turns required for the application..

Thoughts,information & input requested.
 
Wow,
I breezed that posting & looked at the gausememeter build....& totaly missed the emp generator right in the same thread on RCgroups! :lol:
looks like o will lose a few hours reading at rc groups (again!) I already found a link to the same pdf I found googling this morning.

Thanks Miles,
any feeling if having magnet zapping capacity would be of any benifit? is a low priority for sure but its been on my bucket list since the 12th scale racing days.
 
Thud said:
Thanks Miles, any feeling if having magnet zapping capacity would be of any benifit? is a low priority for sure but its been on my bucket list since the 12th scale racing days.
Click to expand...
I honestly don't know.. If you are partly motivated by the possibility of changing the magnetisation direction in order to create custom halbach arrays, I don't think that would be feasible, from what I've read.

eg:

The external magnetizing field is created by a solenoid coil set either side of the compacting powder. The magnetic domains of the NdFeB powder align with the magnetising field that is applied – the more homogenous the applied field, the more homogenous the magnetic performance of the Neodymium magnet. As the Neodymium powder is pressed by the die, the direction of magnetisation is locked in place – the Neodymium magnet has been given a preferred direction of magnetisation and is called anisotropic (if no external field were applied it would be possible to magnetise the magnet in any direction, which is called isotropic, but the magnetic performance would be much lower than that of an anisotropic magnet and is usually confined to bonded magnets).
Click to expand...
http://www.ndfeb-info.com/neodymium_magnets_made.aspx
 
Thud said:
Wow,
I breezed that posting & looked at the gausememeter build....& totaly missed the emp generator right in the same thread on RCgroups! :lol:
looks like o will lose a few hours reading at rc groups (again!) I already found a link to the same pdf I found googling this morning.

Thanks Miles,
any feeling if having magnet zapping capacity would be of any benifit? is a low priority for sure but its been on my bucket list since the 12th scale racing days.
Click to expand...


If the KV of the motor didn't raise, your magnets have exactly the same strength.
 
Hey Luke, the Kv of nearly all my motors in continuous use has increased measurably.
just looking at re-juvinating the neo's where applicable.

I a right behind you miles, just found some pictations of neo magnet production showing the magnet pole alignemt during the pressing operation of the re-ground materials.....doesn't bode well for re-orientation.
 
Thanks for that PDF! It would be useful to have a zapper for NEO magnets, to my knowledge there aren't many, if any, companies in the US that offer such a service. I have a ceramic zapper, and after reading that doc I am going to rip it apart and see what kind it is. My gut feeling is that it is a half cycle.
 
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