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Author Topic: Switchable Magnets.  (Read 52527 times)

synchro1

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Switchable Magnets.
« on: May 05, 2015, 05:45:59 PM »
This video from "K&J Magnetics" shows 400 pounds of force switched on and off:

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

More information:

http://www.kjmagnetics.com/proddetail.asp?prod=MS-400

It looks like it takes a lot less then 400 pounds of force to throw the lever!

truesearch

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Re: Switching magnets.
« Reply #1 on: May 05, 2015, 05:51:23 PM »
@synchro1:


That is very interesting! Any idea how it's being done? Apparently without electricity. . .


truesearch

synchro1

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Re: Switchable Magnets.
« Reply #2 on: May 05, 2015, 06:08:09 PM »
@Trusearch,

The bottom photo's the "Off" position. Just simply two diametrics with steel side walls!

"Now, the cool part about a Magswitch® is that you can turn it OFF.  Here’s where the magic happens.

When you rotate the knob, you’re rotating the top diametrically magnetized disc magnet by 180°.  Now the magnetic field flows from one magnet, through the steel wall and into the other magnet.

The folks at Magswitch® must have done their math right, because the steel structure is shaped and sized just right to keep all of the magnetic field flowing inside the assembly.  It doesn’t reach outside at all!  In this position, no pull force is felt.

We've tried it ourselves, and these powerful magnets won't even pick up a single paperclip in the OFF position".

truesearch

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Re: Switchable Magnets.
« Reply #3 on: May 05, 2015, 06:41:17 PM »
@synchro1:


Your explanation does sound like what is going. Does that main that it takes "real" effort/force to switch from NON-ATTRACT to ATTRACT mode? I'm guessing that would simply because of the "top" magnets rotating to a REPULSION-POLE-TO-POLE arrangement in regards to the "lower" magnets. . ?? .  :-\


truesearch

lumen

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Re: Switchable Magnets.
« Reply #4 on: May 05, 2015, 09:02:41 PM »
It must be in contact with steel to rotate easily to the on position.

synchro1

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Re: Switchable Magnets.
« Reply #5 on: May 05, 2015, 09:20:20 PM »
It must be in contact with steel to rotate easily to the on position.

@Lumen,

The contact between the correctly sized steel walls and the diametric tube magnets is the central feature of this switchable mechanism. Two diametric tubes twisted one over the other, without the steel walls, would be very difficult to separate in attraction by sheer force, then they would be strongly repelled in opposition. The correctly sized steel walls solve both these problems; One, reducing the sheer force for separation; and Two, keeping the magnets attached in repulsion. The magnetic attraction to the steel is greater then the repulsion force between the opposing poles. Butch LaFonte has been demonstrating this kind of "Proof of Overunity" effect on his forum thread.

The question is; Would 400 pounds of "Pendulum Thrust" be sufficient to throw the switch?

synchro1

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Re: Switchable Magnets.
« Reply #6 on: May 05, 2015, 10:24:28 PM »
The ratio of switch force to pull strength is obviously overunity in this switchable magnet. This kind of "Garden variety background advance" has the potential to replace hazardous "Nuclear Fission". It's our job as a group to realize it's potential and get it to generate free power.

lumen

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Re: Switchable Magnets.
« Reply #7 on: May 06, 2015, 12:36:26 AM »
@Lumen,

The contact between the correctly sized steel walls and the diametric tube magnets is the central feature of this switchable mechanism. Two diametric tubes twisted one over the other, without the steel walls, would be very difficult to separate in attraction by sheer force, then they would be strongly repelled in opposition. The correctly sized steel walls solve both these problems; One, reducing the sheer force for separation; and Two, keeping the magnets attached in repulsion. The magnetic attraction to the steel is greater then the repulsion force between the opposing poles. Butch LaFonte has been demonstrating this kind of "Proof of Overunity" effect on his forum thread.

The question is; Would 400 pounds of "Pendulum Thrust" be sufficient to throw the switch?

The correct answer is no.
The 400 pounds is only a contact force and greatly reduced at even small distances.
What I was saying is that the device must be in contact with a steel plate to operate easily, otherwise the handle will rotate much harder.
The action is similar to a standard magnetic base where the magnetic field is simply redirected and without a second path (attached to a steel plate) the rotation force increases as it pushes the already closed path into an open path.
 
 
 

synchro1

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Re: Switchable Magnets.
« Reply #8 on: May 06, 2015, 12:57:59 AM »

The correct answer is no.
The 400 pounds is only a contact force and greatly reduced at even small distances.
What I was saying is that the device must be in contact with a steel plate to operate easily, otherwise the handle will rotate much harder.
The action is similar to a standard magnetic base where the magnetic field is simply redirected and without a second path (attached to a steel plate) the rotation force increases as it pushes the already closed path into an open path.

@Lumen,

The rotor would grow flush and in close adjacency with the magnet switch at TDC, not actually attached, but nearly enough to operate easily right at that exact position. Turning back on presents a different problem. One could run a "Merry go round" with a set of these kinds of magnet switches.

sveinr

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Re: Switchable Magnets.
« Reply #9 on: May 06, 2015, 04:55:51 PM »

Here is some more information from Wikipedia.


https://en.wikipedia.org/wiki/Magnetic_base


synchro1

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Re: Switchable Magnets.
« Reply #10 on: May 06, 2015, 08:08:50 PM »
@sveinr,

Thanks. I uploaded some good photos: We can see how the magnet connects the ferrite  keepers in the "ON" position in the bottom photo: This variety only has to throw 90º.

synchro1

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Re: Switchable Magnets.
« Reply #11 on: May 06, 2015, 08:22:04 PM »
Here's a Dual Switch model of that type from "StrongHand":

Adjust-O™ 90° Dual Switch Magnet Squares

Angle magnet squares with the convenience of On/Off switches.

For professional jobs that demand strong hold down forces. Hold flat and round metal work pieces.
•Two On/Off switches for independent operation.
•Turn the magnets Off when setting up, turn On when you're ready to work. Easy and safe set-up!
•Precision machined flat and V-surfaces are ideal for round and square tubing, angle, and flat stock.
•Choose from 120 - 265 LBS (55 - 120 kg) pull force.

A small servo and trigger switch would deliver 265 pounds of pull force at TDC to the ferrite rotor from one face! This model would spin a very large and heavy iron rotor. Saturation's our enemy, so slow and heavy is best. This model could probably power a large 360º pendulum. Naturally, "High Permeability" rotor material would allow for higher R.P.M. It might be possible to use both 90º magnet switch faces with an "L" shaped rotor.

synchro1

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Re: Switchable Magnets.
« Reply #12 on: May 06, 2015, 10:38:56 PM »
This video shows a 90º magnet base in action:

https://www.youtube.com/watch?v=n0vX8VTiiDg

synchro1

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Re: Switchable Magnets.
« Reply #13 on: May 06, 2015, 11:01:07 PM »
The Noga DG0039 1300 Newtons. Most powerful magnet switch in the Noga line: 1300 Newtons is 292.2516270323 pounds of force.

lumen

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Re: Switchable Magnets.
« Reply #14 on: May 06, 2015, 11:33:02 PM »
This video shows a 90º magnet base in action:

https://www.youtube.com/watch?v=n0vX8VTiiDg

Yes! but the video never shows how it becomes much harder to turn to the on position when it's not on the steel surface.
In fact if you turn it half way on and remove it or tilt it on the steel surface it will switch itself to the off position due to the increased pull to the off position.

I have about four of these and they all work the same.
One would need to do some testing but I believe no OU here.