Building a Halbach array
Step-by-step instructions for those keen on experimenting
Project 324 - Online since: 07/04/2010, Number of visits: 85075
I'd like to present to you step-by-step instructions on how to build a Halbach array. I did a lot of experiments lately on this subject. The Halbach array is a special arrangement of magnets, which "bend" the magnetic flux: On the one side the magnetic field becomes up to twice as strong, on the other one it decreases. The longer the arrangement the stronger the effect.
- 1 medium-size piece of iron or steel (approx. 20 x 15 cm)
- 1 small piece of iron or steel (approx. 10 x 3 cm)
- Straight piece of non-magnetic material, e.g. copper or wood
- Strong adhesive, e.g. UHU plus endfest 300
- Small spatula or something similar to apply adhesive
- Transparent adhesive tape
- Waterproof felt pen
- Sand paper
- Super magnets (at least 6), e.g. W-07-N or Q-15-04-04-MN
16. Remove the iron pieces after drying. The top piece can be removed easily. Thanks to the Halbach arrangement, the magnets strongly adhere to the bottom piece though. How to remove the bottom piece: Place the magnets on the edge of a table (see picture below), hold on to the magnets and slowly push the iron piece downwards.
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