Basic question about Halbach magnet array

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Discussion Overview

The discussion revolves around the feasibility and characteristics of Halbach magnet arrays, specifically addressing whether a Halbach array can consist of fewer than three magnets and the interactions between two magnets oriented in specific ways. The scope includes theoretical considerations and practical applications related to magnet arrangements.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Homework-related

Main Points Raised

  • One participant questions if a Halbach array can consist of only two magnets, expressing difficulty in finding information on this topic.
  • Another participant argues that a proper Halbach array requires at least three magnets to achieve the necessary arrangement.
  • A different viewpoint suggests that a "halbach-like" effect could be achieved with two magnets oriented at 90° to each other, though it would not be as effective as a full Halbach array and would require non-ferromagnetic material for a complete bar.
  • One participant inquires about the effects of placing two strong sides of a Halbach array facing each other at a minimal distance.
  • Responses indicate that the magnets will either attract or repel each other based on their orientation, with explanations provided about the conditions for attraction and repulsion.
  • Some participants reiterate the conditions for attraction and repulsion, discussing the torque experienced in different orientations.
  • A participant clarifies that their inquiry is related to a school exhibition rather than a homework problem.

Areas of Agreement / Disagreement

There is no consensus on whether a Halbach array can consist of fewer than three magnets, with some participants asserting it cannot while others propose alternative configurations. The discussion about the interactions between two magnets shows agreement on the basic principles of attraction and repulsion, but the context of the inquiry remains varied.

Contextual Notes

Participants express uncertainty regarding the effectiveness of non-standard configurations of Halbach arrays and the specific conditions under which magnets will attract or repel each other. The discussion does not resolve the implications of using fewer than three magnets in a Halbach array.

berned_you
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Can a magnetic Halbach array have less than three (i.e. two) magnets in the array? I can't seem to figure this out quickly with google. TIA!
 
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I don't think so. How could you get the proper arrangement needed for a Halbach array?
 
I guess you can get something "halbach-like" with two magnets in a 90° orientation relative to each other. Won't be as good as an actual halbach array and you have to fill it with non-ferromagnetic material if you want to get a full bar, but it would have an asymmetric field.

What is the purpose of that?
 
i have a question. What would happen if we put two strong sides of halbach array facing each other and with minimal distance between them?
answer needed urgently..:nb)
 
They will strongly attract or repel each other depending on the orientation.
 
mfb said:
They will strongly attract or repel each other depending on the orientation.
Can you please explain the orientation?
 
If you put "N" of one next to "S" of the other and vice versa they will attract, if you try to put both "N" together they will repel. If you try other orientations you'll get torque towards the attracting orientation.

Is this a homework problem?
 
mfb said:
If you put "N" of one next to "S" of the other and vice versa they will attract, if you try to put both "N" together they will repel. If you try other orientations you'll get torque towards the attracting orientation.

Is this a homework problem?
Nope. I am asking coz I have making something for my school exhibition.
 

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