Language: 
To browser these website, it's necessary to store cookies on your computer.
The cookies contain no personal information, they are required for program control.
  the storage of cookies while browsing this website, on Login and Register.

GDPR and DSGVO law

Storing Cookies (See : http://ec.europa.eu/ipg/basics/legal/cookies/index_en.htm ) help us to bring you our services at overunity.com . If you use this website and our services you declare yourself okay with using cookies .More Infos here:
https://overunity.com/5553/privacy-policy/
If you do not agree with storing cookies, please LEAVE this website now. From the 25th of May 2018, every existing user has to accept the GDPR agreement at first login. If a user is unwilling to accept the GDPR, he should email us and request to erase his account. Many thanks for your understanding.
Amazon Warehouse Deals ! Now even more Deep Discounts ! Check out these great prices on slightly used or just opened once only items.I always buy my gadgets via these great Warehouse deals ! Highly recommended ! Many thanks for supporting OverUnity.com this way.

User Menu

Tesla Paper

Free Energy Book

Get paid

Donations

Please Donate for the Forum.
Many thanks.
Regards, Stefan.(Admin)

A-Ads

Powerbox

Smartbox

3D Solar

3D Solar Panels

DC2DC converter

Micro JouleThief

FireMatch

FireMatch

CCKnife

CCKnife

CCTool

CCTool

Magpi Magazine

Magpi Magazine Free Rasberry Pi Magazine

Battery Recondition

Battery Recondition

Arduino

Ultracaps

YT Subscribe

Gravity Machines

Tesla-Ebook

Magnet Secrets

Lindemann Video

Navigation

Products

Products

WaterMotor kit

Statistics

  • *Total Members: 83996
  • *Latest: sb

  • *Total Posts: 892927
  • *Total Topics: 15675
  • *Online Today: 44
  • *Most Online: 103
(December 19, 2006, 11:27:19 PM)
  • *Users: 1
  • *Guests: 11
  • *Total: 12

Author Topic: Demagnetization risk of Neo magnets in repel mode?  (Read 22398 times)

Offline gyulasun

  • without_ads
  • Hero Member
  • *****
  • Posts: 4068
Re: Demagnetization risk of Neo magnets in repel mode?
« Reply #30 on: September 04, 2007, 08:35:58 PM »
Iv'e been having two N50M neos in repel mode for 3 month now and I measured them yesterday to
see if they had lost any of their strength. Well, they hadn't lost anything. They were as good as new.

The originally measured 0.51 tesla on the surface and 3 month later in repel they still measure 0.51 tesla.
Maybe they won't become demagnetized when just sitting still. Perhaps motion is required???
I might build a rotating repel test machine later on to see if they can handle that to.



Hi Honk,

Thanks for showing this.  May I suggest to check the magnets temperature when you first try the same test with motional Neos.  IF eddy currents are involved they will heat up the Neos and this may cause some demagnetization in time.

Gyula

Free Energy | searching for free energy and discussing free energy


Offline markdansie

  • Hero Member
  • *****
  • Posts: 1471
Re: Demagnetization risk of Neo magnets in repel mode?
« Reply #31 on: September 10, 2007, 03:59:18 AM »
I thought I might ask here (sorry of topic)
does anyone know of a good 3d fem software for magnet research
My email is mark.dansie@advatel.biz
Thanks

Offline Honk

  • Sr. Member
  • ****
  • Posts: 497
Re: Demagnetization risk of Neo magnets in repel mode?
« Reply #32 on: October 28, 2007, 11:33:37 PM »
I got some new information from a source connected to the manufacturing of neodymium magnets.

Quote:
-----------------------------------------------------------------------------------------------------------------------------------------------------------------
The force field in a magnet is static even if the magnet is moving, That has got to do with the source of the force.
The source of the force field in a magnet is the magnet itself, due to the molecular alignment. Hence the description "static".
In an electromagnet, the force is "dynamic" because there is a flow of current. It's the Amperes that demagnetise the magnet.
And to demagnetise it, the whole magnet must be inside the force field of the electromagnet. In a rotating motor only the poles/tips
are exposed, hence degradation is not present. There is always some shape degradation (natural los of power) but that is irrelevant.
For Neo magnets its around 5-10% in 100 years. That's all.
-----------------------------------------------------------------------------------------------------------------------------------------------------------------

This seems to make real sense. There is no demagnezitation of Neodymium magnets in repel mode. End of story.

Now all of you repel mode builders can start building your motors without any risk of demagnezitation. Good luck.

Free Energy | searching for free energy and discussing free energy

Re: Demagnetization risk of Neo magnets in repel mode?
« Reply #32 on: October 28, 2007, 11:33:37 PM »
Sponsored links:




Offline Low-Q

  • without_ads
  • Hero Member
  • *****
  • Posts: 2838
Re: Demagnetization risk of Neo magnets in repel mode?
« Reply #33 on: October 31, 2007, 10:20:08 AM »
There is a lot of people telling us that placing magnets in repel mode will demagnetize them.
But many of those people have used inferior magnets in their test, like cheap ferrite.
And then we hear over and over again that repelling magnets will demagnetize them.
But that might not be true if you are careful and use neomagnets of the same size,
shape and strength in repel mode. Then the fields are equal in strength.

Please read the question at this link. It explains my concern.
http://www.overunity.com/index.php/topic,2451.msg39543.html#msg39543
I think we have to sort out the risk when using good quality NdFeB magnets.

So, if we have two equally strong neo magnets of the same size and shape
they should be able to operate in repelling mode without demagnetization.

I have attached a demagnetization graph on several types of magnets.
But I have trouble understanding how to read it. Can someone here explain
how to see what type of field it takes to demagnetize the N38 in the graph?
It might clarify wether it can withstand or not to be demagnetized of a similar
external field as the N38 holds.

My experience is that one stronger magnet can demagnetize another weaker magnet.
Not even two ferrite magnets with same stregth can demagnetize each other, but if you take a neo magnet, and a ferrite magnet, the ferrite magnet will change polarity instantly when the neo magnet are close enough.
I have glued two small disc neomagnets together, equal poles facing. Then I putted them in my drawer, and after a very long time I forgot it was there, so recently I found them in my drawer. I separated them but the magnetism dont seem to weaken much. They must have been together for a year now.
My experience.

Vidar

Offline hoarybat

  • Newbie
  • *
  • Posts: 22
Re: Demagnetization risk of Neo magnets in repel mode?
« Reply #34 on: September 29, 2009, 03:48:03 PM »
Repel motor using N50 here  ran for 4 days and  dead.

Alittle bit about demag, Sorry its not much .

http://video.google.com/videoplay?docid=1681787127575536292&q=Walter+Lewin&total=91&start=0&num=10&so=0&type=search&plindex=3

The demagnetized motor you talking about is it a magnet only motor (stator rotor setup with magnets) with no electricity applied?  Or an electromagnet motor as Honk suggested above?

THanks
« Last Edit: September 29, 2009, 06:47:10 PM by hoarybat »

Free Energy | searching for free energy and discussing free energy

Re: Demagnetization risk of Neo magnets in repel mode?
« Reply #34 on: September 29, 2009, 03:48:03 PM »
Sponsored links:




Offline hoarybat

  • Newbie
  • *
  • Posts: 22
Re: Demagnetization risk of Neo magnets in repel mode?
« Reply #35 on: October 01, 2009, 12:39:09 AM »
I got some new information from a source connected to the manufacturing of neodymium magnets.

Quote:
-----------------------------------------------------------------------------------------------------------------------------------------------------------------
The force field in a magnet is static even if the magnet is moving, That has got to do with the source of the force.
The source of the force field in a magnet is the magnet itself, due to the molecular alignment. Hence the description "static".
In an electromagnet, the force is "dynamic" because there is a flow of current. It's the Amperes that demagnetise the magnet.
And to demagnetise it, the whole magnet must be inside the force field of the electromagnet. In a rotating motor only the poles/tips
are exposed, hence degradation is not present. There is always some shape degradation (natural los of power) but that is irrelevant.
For Neo magnets its around 5-10% in 100 years. That's all.
-----------------------------------------------------------------------------------------------------------------------------------------------------------------

This seems to make real sense. There is no demagnezitation of Neodymium magnets in repel mode. End of story.

Now all of you repel mode builders can start building your motors without any risk of demagnezitation. Good luck.

HONK are you/above saying that when people are using the Wankel design utilizing an electromagnet they are demagnetizing their motor within days (are the peoples who's motors died within days using the Wankel design with electromagnet)?  They were not specific.  If so basically a magnet motor which only uses magnets without an outside source such as electromagnetism should not have their Neo's demagnetized once and for all as you mentioned?

Offline hoarybat

  • Newbie
  • *
  • Posts: 22
Re: Demagnetization risk of Neo magnets in repel mode?
« Reply #36 on: October 16, 2009, 05:44:03 PM »
Anyone here that can help with my above post?  I am about to receive and apply my new magnets.  Thanks

Free Energy | searching for free energy and discussing free energy

Re: Demagnetization risk of Neo magnets in repel mode?
« Reply #36 on: October 16, 2009, 05:44:03 PM »
Sponsored links:




 

OneLink