halbach array flux density

[aarnold]

Hi,
does anyone built a halbach array? How does it works? My doubt is at the sides there are flux or they are blocked too? To help you know what i`m talking about see the image attached. In the red arrows we have magentic flux? is increased or blocked?

thanks
Augusto Arnold

[rotorhead]

aarnold, There is some flux but it will be very weak. Halbach arrays don't "block" flux, they just concentrate it in certain areas.

[one]

Hi,
does anyone built a halbach array? How does it works? My doubt is at the sides there are flux or they are blocked too? To help you know what i`m talking about see the image attached. In the red arrows we have magentic flux? is increased or blocked?

thanks
Augusto Arnold

Hi,
does anyone built a halbach array? How does it works? My doubt is at the sides there are flux or they are blocked too? To help you know what i`m talking about see the image attached. In the red arrows we have magentic flux? is increased or blocked?


Augusto Arnold

Aarnold

I  did some playing with halbach  arrays  a few years  ago ...

As far as I can see they  just  concentrate  the   magnetic flux ......... it is interesting  most of the  flux is on one side .

They  are  pretty easy to build

All you need  are some square   magnets.  some super glue .  and  some alumimum   tape  to make it  a little more  durable. 

Simply   glue the magnets together  each one  rotated 90 degrees  more than the last





Another   thing that seems interesting is that if you make   a bunch of  halbach arrays   lay them side by side  but   rotate  each one  90 degrees  you  get a  large halbach  array .    on its face it  has   same poles on both sides and 2  rows  of " pockets "  of   the opposite pole

[aarnold]

Hi Rotorhead and One,
thanks for your replies. Certainly I'll do some tests .. Do you know how stronger the magnetized side increases ? I'll buy some neos cubes to play with... then I'll post some pictures in the forum just to registrate it.
thanks again
Augusto Arnold

[one]

Hi Rotorhead and One,
thanks for your replies. Certainly I'll do some tests .. Do you know how stronger the magnetized side increases ? I'll buy some neos cubes to play with... then I'll post some pictures in the forum just to registrate it.
thanks again
Augusto Arnold

Aarnold       I  don't know  what %  of the  magnetic flux is focused on one side .. ...  I would guess  that it is  somewhere around  80%  ........  I was impressed    when I first  saw it . 

If you want to try  a  rather  big project   with   halbach arrays      try making a  stator  from  a  ring  of  halbach arrays   then  for the rotor  make an electromagnet  version of the  halbach array ......I am pretty sure that if you reverse  polarity on the  2nd   and  4th   magnets  the  array will   " flip "




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I don't mean to get picky  here ...........but  my login name here  needs to have  a small o .... one with a capital  O is  another person


gary