Magnetic field direction on Halbach array?

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Discussion Overview

The discussion revolves around the design and configuration of Halbach Arrays, specifically focusing on creating a circular array that amplifies the magnetic field away from the array rather than towards its inner diameter or outer circumference. Participants explore the feasibility of such a design and the implications of magnet orientation.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant inquires about the possibility of creating a circular Halbach Array that amplifies the magnetic field outward, referencing traditional straight configurations.
  • Another participant suggests that assembling multiple magnets in a loop can achieve a strong magnetic field outside the ring, with a weaker field inside.
  • A different participant expresses a desire to create two opposing polarities in the array and questions how to choose the polarity of the strong side.
  • It is noted that while various shapes can be formed with magnets, the notable magnetic field strength is primarily close to the magnets themselves.
  • A participant clarifies that they are using N50 cube magnets arranged in a circular pattern rather than fridge magnets.
  • One participant proposes that achieving the desired magnetic field orientation requires specific arrangements of the north and south poles of the magnets, suggesting a configuration where poles face perpendicular to the array assembly.
  • Specific magnet models are recommended for achieving the desired configuration, indicating that different magnet orientations yield different field strengths.

Areas of Agreement / Disagreement

Participants express varying views on the feasibility and configuration of the circular Halbach Array. There is no consensus on the best approach, and multiple competing ideas about magnet orientation and design remain present.

Contextual Notes

Participants discuss the limitations of using different types of magnets and the implications of their orientations on the resulting magnetic fields. There are unresolved questions regarding the specific configurations needed to achieve the desired field characteristics.

kodachrome
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Hi, hopefully someone here can help me! I'm interested in Halbach Arrays and specifically I want to make a circular array in which the field is amplified away from the array (as in above or below it), not to its inner diameter (or exterior circumference).

Is this possible?
On the web I've seen images of wedge/arc shaped magnets making circular arrays but the fields seem to be within the same "plane" as the magnets (inner circle and outer circumference).
The traditional straight "fridge magnet" 5 cube-magnet Halbach array does what I want but I need it physically in a circle.. what happens if you make the line say 15 cubes long and make it loop around on itself?
 
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I'm not sure if I understand you correctly, but assembling multiple fridge magnets (or similar) in a loop is certainly possible, and will give a large magnetic field outside close to the ring with a small magnetic field inside the ring.
 
Sounds more like you are describing the normal inner/out configuration. I'm looking to do something more like this (though not with the pricey arc/wedge magnets):
Halbach.jpg


Id like to build two, with opposing polarities.. I'm now thinking how one "chooses" the polarity of the strong side too?
 
You can form any shape with the fridge magnets or their equivalents. Note that you don't get those large arrows: the field is only notable close to the magnets.
 
Thanks... to clarify however I am not using fridge magnets, only mentioned them as they are straight lines vs and arc shaped halbach array. I'll be using N50 cube magnets arranged in circle pattern.
 
kodachrome, the array you're talking about should be possible with the correct set magnetic field orientations. What you want are the north and south poles of every other magnet to be facing perpendicular to the array assembly, like an axle going through a wheel, rather than toward the center and exterior of your array structure. So those magnets need to be magnetized in what is known as the thickness direction. Take a look at k&j magnetics for their selection of magnetic segments. You would use the AY0X030-C and AY0X030-T magnets for the array you're describing. The AY0X030-C, AY0X030-S, and AY0X030-N magnets are used for the array you mentioned that you commonly see where the strong field is within the inner circle. Hope that helps!
 

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