The First TPU

[turbo]

hey that looks like the little motor experiment i did a while back.
when you turn a stepping motor, you will find that there is a what i call "magnetic moment"

at first the field resists being compressed, and when you drive it futher it actually repells from this magnetic moment.

the idea was to cancel out this first half sine resisting force by feeding in an inversed signal into the coils to cancel the first half of this resistive force, and then when the motor is over it's resistive point ,it only is left with this repelling force, resulting in an acceleration only......

Marco.

[MACEDONIA CD]

HI  TO ALL
its seems to me  this forum is never be close to end for this sm mistery
i have read this and  and i thing  thiw
do you enyone of you thimg ho is beter trnasmite the magnet fild  or elktromagnet fild  <<<<iron  ,,or copper >>
i ts sems to me  we all make a mistake here   <<<LET S  MADE A ORDENERY  TRANSFORMER  WHIT  IRON WIRE  AND WE  SEE WHAT WHILL HAPEND  IF THE  IRON IS THE BEST TRANSMIT OF MAGNET FILD  OR  ....... LIKE  A RECIVER OF MAGNET FILD
maybe  that is the reasons way maybe is iron  to bring the earth mag fild  close to the it self  <<i mean iron>>
LET SAY  WE HAVE  SOME  VERY BIG MAGNET FILD  AND HOW WE BE ABLE TO CATCH THIS FILD  WHIT  LET SAY COPERR >> WE WHILL BE NOT CATCH THIS FILD   BEACOUSE THE COPER HAS NOT ATRAKTED TO ENY KIND OF MAGNET  ...
FOR THIS I MEAN MAYBE  IS THIS HI SAID  IS IRON WIRE <<,LIKE  RECIVER  OF MAGNET FILD ..
OK LET SEE ANTHER WAY
IF  YOU  PUT ONE WIRE <<COOPER  LET SAY  10cm   AND IRON THE SAME LIKE 10cm >> THIS 2 PIECES  FIRST MOVE CLOSE PERM .MAG  WHIT SOME SPEDD AND PUT IN THIS ENDS  A SCOPE  AND SEE  WHAT WHILL BE DIFERENT THERE  OF THIS COPPER  AND IRON WIRE ........
ITS  I THING   THIS  WHEN IS CLOSE PERM MAG TO THE IRON WIRE IS HAPEND THIS  <<<< ALL MAGNET FORCES OF PERMA MAG GOING DIRECKTLY TO THE IRON LIKE  ATRACTED TO THAT IRON AND  ALL MAG FORCE  IS THERE IN TO THE IRON AND WHEN IS MOVE THERE WHILL BE MORE POWER OF FILD WHILL BE ABLE  TO MOVE THE INSAID ELKTRONES IN THE  IRON WIRE   ....
<<< LIKE   A 100% MAGNET FORCE  IS IN THE  IRON WIRE   >>>
<<< AND THE  COOPER WIRE MAGNET FORCES WHILL BE NO ABLE  TO PUT INSAID THE COOPER  I TS SEEMS THAT THIS MAG FORCE IN THE COOPR  IS AROUND  HIM NOT INSAID THE STRUCTURES  OF THAT >>>
WE KNOW THAT  THE ELKTRONES IS  IN THE  INSAID OF THE  COOPERS  OF IRON  IF  WE  WHANT TO MOVE THIS ELKTRONES  WE NEED SOME MAG  AND  THIS MAG  FILD  MOST  GO TO THE INSAID OF THIS MATERILAS AND START TO MOVE INSAIDS ELKTRONES ..ITS  I MEAN THE IRONS IS THE BEST CATCHER OF MAG FILD  AND WHEN WE MOVE MAG CLOSE TO THIS  WE  BE MOVE  ALL INSAID ELKTRONES IN THA IROR  LIKE LET SAY 100%
BUT IF WE MOVE MAG CLOSE TO THE COOPERS  THE INSAID ELKTRONS WHIL BE MOVE  BUT WHITOUT ALL OF  LETS SAY 50% ..THE REASONS IS THAT  ALL
MAGNET OF THE MAG IS NOT GOING TO THE COOPER  AND  THAT IS WAY COOPERS  DONT PRODUCED  TO MOVE ALL ITSSELFS ELKTRONES 
<<<<  IF WE MOVE  MORE INSAID ELKTRONES  WE GET MORE POWER >.
TO MOVE MORE ELKTRONES  TO COPERS WIRE  THE COPERS WIRE MOST BE CATCH MORE  MAG FILD INSAID ITS SELF >>
WE GET THE SOME ANSFER S NOW  THE IRONWIRE ISVERY GOOD RECIVER FOR MAGNET FILD TO ITS SELF ... THE COPER IS NOT   

[slapper]

Permalloy is used in magnetic sensors. The magnetic domains of permalloy thin film deposited on a piece of silicon must be unidirectionally aligned to avoid a very noisy sensor.

A layer of conductive material is laid down along the permalloy sensor elements, in parallel, to allow a method to receive a sharp pulse of current. This sharp current pulse provides the necessary magnetic field pulse to align the magnetic domains in the permalloy sensor elements.

Barber-pole straps over the top of the permalloy elements are added to make the sensor more stable. These straps add stress lines onto the permalloy elements where the domains are more likely to line up perpendicular to the barbor-pole straps.

Futhermore, during the wafer-fab process these sensors are exposed to a dc magnetic field while they are getting annealed.

The sensor is still susceptible to getting into a noisy state from short exposure to a heavy and randomly aligned magnetic field. Degaussing coils work pretty good at getting these sensors into a noisy state. We found that a modified soldering gun with the soldering tip replaced with a heavy copper coil worked wonders at getting the sensors into a noisy state. The more random the magnetic domains are in the permalloy sensor elements the more noisy the sensor.

Because the sensors we had fabricated did not have the conductive layer deposited for the domain alignment we would manually align the domains in the permalloy by placing a magnet's pole in line with the sensor element with the proper polarity to be compatible with the barber-pole configuration.

Aligning the magnetic domains in the permalloy makes for a very clean sensor. Randomally aligned domains make for very noisy sensor elements.

Permalloy, however has nickel in it which allows for a near zero magnetostriction. But I'm thinking magnetostriction would add to instability which may be desired in this application.

Take care.

nap

[BEP]

Now if you have two speaker magnets that are joined by a flat square wave shaped coil of iron wire.....

At each bend of wire extend beyond the magnet to hide the bend from the internal workings between the magnets.

Sorry - thinking out loud here. I've seen this NR activity in my Cook coil experiments. It does indeed work. I attributed it to GMR but it equally fits NR.

[EMdevices]

speaking of magnetic resonance,

I was able to obtain a small DC voltage from an oscillator and a magnet.

Look at the figure below.Ã,  Ã, It is a Colpitts oscillator with the typical tap between the capacitors.Ã,  It's a bit modified from the typical topology, but it works.

Here's what I did:

Ã,  Ã, While it was oscillating, I brought a ceramic magnet close to the small toroid inductor, in the same orientation as we see in the SM videoÃ,  (from the side, flux horizontal)

As the core saturates,Ã,  I can see on the scope the frequency increasing, which is expected.Ã,  Ã, However, at a certain point, a type of heterodyning appears, and I see an amplitude modulation start to appear on top of the signal, sort of like a beat frequency.

As I approach the magnet even closer, that's when it happens.Ã,  Ã, A sharp drop in the DC offset by maybe 1.5 volts.Ã,  Even the slightest movement of the magnet closer or farther,Ã,  will end this effect.Ã,  Ã, It only occurs at a particular point of saturation of the core.Ã,  Ã, I believe the Larmor precession frequency might have something to do with it.Ã,  Rotation of fields might be occuring where the flux cuts through the coil widings IN THE SAME direction, so a DC generator effect takes place.Ã, 

I have more experimenting to do, changing orientations, etc..Ã,  but it's very encouraging right now.

EM

P.S.Ã,  I added another figure to show where the Oscilloscope connects and the flux orientation.Ã,  I haven't experimented with the different directions yet, only N or S, and both work.Ã,  Ã,  Now,Ã,  if you look where the scope connects,Ã,  the DC offset at this point is 10 volts or close to it.Ã,   While in operation and oscillating a sinusoidal waveform is imposed on this DC offsett.Ã,   So, when the effect takes place,Ã,  the DC voltage offset of these oscillations drops suddenly to 8.5 Volts.Ã,   Quite impressive to say the least.