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Topic: Where can I buy an Electro-Permanent Magnet? (Read 3053 times) previous topic - next topic

Jakobud

Where would I buy an Electro Permanent Magnet that I can easily interface and control with an Arduino?

fungus

Have you tried using google?

Or even ebay: http://www.ebay.com/sch/i.html?_nkw=electro+permanent+magnet
No, I don't answer questions sent in private messages (but I do accept thank-you notes...)

Jakobud

Yeah but it's not clear where to buy them.  All the ebay results are "Electro-craft" permanent magnet motors.... which are not the same thing as an Electro Permanent Magnet.

retrolefty


Yeah but it's not clear where to buy them.  All the ebay results are "Electro-craft" permanent magnet motors.... which are not the same thing as an Electro Permanent Magnet.


Try: http://www.ebay.com/sch/i.html?_odkw=electro+permanent+magnet&_osacat=0&_trksid=p2045573.m570.l1313.TR11.TRC1.A0.H0.Xelectromagnet&_nkw=electromagnet&_sacat=0&_from=R40

I see many such magnets listed. One thing on considering/choosing such a magnet is the 'holding strength' of such a magnet and that is how good a metal to metal matching surface the magnet makes with whatever you are trying to attach to. Such strength ratings assume a perfect 100% surface contact

jackrae

What's an "electro-permanent magnet"
Electro magnet = one that is magnetic when energised
Permanent magnet = one that is permanently magnetised

So what is it you are looking for ?

Chagrin

http://copter.ardupilot.com/wiki/common-electro-permanent-magnet-gripper/

Jakobud

An electro permanent magnet is an electro magnet that does not require current to maintain it's polarity.  It only requires current to switch polarities.

Jakobud



Yeah but it's not clear where to buy them.  All the ebay results are "Electro-craft" permanent magnet motors.... which are not the same thing as an Electro Permanent Magnet.


Try: http://www.ebay.com/sch/i.html?_odkw=electro+permanent+magnet&_osacat=0&_trksid=p2045573.m570.l1313.TR11.TRC1.A0.H0.Xelectromagnet&_nkw=electromagnet&_sacat=0&_from=R40

I see many such magnets listed. One thing on considering/choosing such a magnet is the 'holding strength' of such a magnet and that is how good a metal to metal matching surface the magnet makes with whatever you are trying to attach to. Such strength ratings assume a perfect 100% surface contact


An electromagnet solenoid lifting magnet is not the same thing as an electro permanent magnet.  The ones you link to in the ebay listings are magnet solenoids that you apply a current to in order for it to enable/disable magnetization.

retrolefty

Quote
Quote

An electromagnet solenoid lifting magnet is not the same thing as an electro permanent magnet.  The ones you link to in the ebay listings are magnet solenoids that you apply a current to in order for it to enable/disable magnetization.


I see that now. Never knew it was a common item but maybe it's not so common and only made by a few?

Anyway wikipedia says:

http://en.wikipedia.org/wiki/Electropermanent_magnet

jackrae

Many thanks for the educational bite - never too old to learn - though at my age retention of yesterday's education is a problem  :D

TomGeorge

#10
Apr 06, 2014, 02:18 pm Last Edit: Apr 06, 2014, 02:22 pm by TomGeorge Reason: 1
Hi,  an electro permanent magnet will have a "hard" iron core, as compared to "soft" iron for an electromagnet as we all know it.
Thats how I read it.

http://en.wikipedia.org/wiki/Electropermanent_magnet


http://www.magnets2buy.com/acatalog/Electro-magnets.html

and I just googled electro permanent magnet....  simple...

Tom..... :)
Everything runs on smoke, let the smoke out, it stops running....

Jimmee

There seemed to be a fair bit of confusion on the idea of an "Electro-Permanent" Magnet in this thread.

Just to clarify and simplify, it is a magnet that can have its magnetic quality turned on or off without the need for a permanent electrical charge. Essentially, you can make a magnet to be magnetic with an electrical pulse to turn it on or off.

It is sort of an hybrid between an Electro Magnet (requiring constant electric charge) and a permanent magnet.

I'm not sure if anyone is still interested in finding one (I sure was), but i found one that MAY suit. I have not tried this product, I have simply just found it after a bit of a search.

http://nicadrone.com/index.php?id_product=66&controller=product

 
Those that posted the ebay search links... You'll find those searches (well at least at the current time) are highly unhelpful. They seem to only show results for Electro magnets only. Perhaps this was from lack of understanding of the desired product?



For those who want to know more about electro-permanent magnets, I found this handy product review that explains it quite nicely:

https://youtu.be/ukT6riqyE-A?t=37m32s



Also there is a quick product review here (though an older version of it):

https://www.youtube.com/watch?v=Pkj6ILblIyg


This particular electro-permanent magnet seems to be focused around using them for drones, but looks like a nice product.

:)

Jimmee


OldSteve

There seemed to be a fair bit of confusion on the idea of an "Electro-Permanent" Magnet in this thread.
@Jimmee, as your first post on these forums, why reply to a thread that's over 18 months old?
Please do not PM me for help. I am not a personal consultant.
And others will benefit as well if you post your question publicly on the forums.

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