Turning on and off a Pernament Magnet Field

[Mica Busch]

No power is used during the off state, in fact it gives power back from back EMF during the off state. ....
During the off state the magnetic field is at about 99% gone.

Later,,,,JackH

Ahh Jack, now I have understood your design.
You norrmally have shorted out the flux of the statormagnet
via a shortout core at the OFF state, no power required.

And then use an 8 Watts energy pulse via a coil around this
shortout core to redirect the flux
from the shortout core to a different core, where your rotor
magnet is driven , right ?

Looks like an "inverted" Flynn design then...
Regards, Stefan.

Actually, he previously mentioned that flynn's design could not be used for his purposes, because a motor requires an air-gap, and the flynn device requires direct contact or the magnetism has nowhere to 'flow'.

He refers to the use of a 'valve' to turn the magnets on and off, therefore I would think of it as a sort of field constriction, an analog of the water and air valves we are familiar with...

[JackH]

Hello hartiberlin,

You are close, but you still do not have the valve correct yet.   I have allready tryed what you have talked about.   Works but not very efficient.

Keep up the good work and you may get it.

Later,,,JackH

[z_p_e]

Actually, he previously mentioned that flynn's design could not be used for his purposes, because a motor requires an air-gap, and the flynn device requires direct contact or the magnetism has nowhere to 'flow'.

This is incorrect. Flynn has already adapted his method for rotation, see his website. Direct contact is not required. Magnetism will jump an air gap to flow through a higher permeable medium.

He refers to the use of a 'valve' to turn the magnets on and off, therefore I would think of it as a sort of field constriction, an analog of the water and air valves we are familiar with...

I would be cautious about assuming that "valve" really means "valve" in this case. Jack may have chosen the term "valve" because the end result is the same. I do not believe it is possible to cut off the flow of flux between the poles of a permanent magnet. Constricted or not, and diverted or not, the total flux flowing from pole to pole has to remain constant. Probably a more appropriate term for what Jack is doing is "switching" the magnet's field like a SPDT switch for flux, using a flux diversion means such as what Flynn et al are doing.

Jack, as you have said that Stefan was close in his analysis, I am assuming that mine is reversed.

As you have stated that your method increases the field strength by 400%, and that your method works for any size and strength of magnet, one must assume that the applied DC pulse (which is always 8 Watts) for the ON state, is not aiding the permanent magnet's field in any way.

Darren

[Mica Busch]

Actually, he previously mentioned that flynn's design could not be used for his purposes, because a motor requires an air-gap, and the flynn device requires direct contact or the magnetism has nowhere to 'flow'.

This is incorrect. Flynn has already adapted his method for rotation, see his website. Direct contact is not required. Magnetism will jump an air gap to flow through a higher permeable medium.

Ah! I see that now...  I think what I meant was that with an air-gap, the flux of the magnet wont be diverted unless power is applied, when power is switched off, the flux returns to its normal state. With direct contact, I would assume [assume!] that the flux would stay diverted, now that is has an easy path to follow - air is much more difficult to traverse than metal.
But as I have no experimental proofs to establish this, I cannot be sure.

And yes, the valve analog probably was not the best, but again my knowledge is limited as to the true workings of a magnet... It is intruiging though, a method to 'turn off' a magnet either electrically or mechanically... What comes to mind is a 'sheath' around the magnet periphery, not on the faces, but there to 'short circuit' and concentrate the flux lines into the sheath so there is minimal outer interaction...

[nightwynd]

sorry to interrupt the train of thought - got into this thread a little late. The material in the hard drive that you were referring to is called mu metal. There are many companies around the web that can fabricate it - it also comes by the roll... mostly used for EM shielding, but apparantly can be used on Permanent magnets if it's thick enough. It also has some very interesting properties when hooked up to an ELF generator.

2 cents - spent.

Sincerely,
nightwynd