To generate a steady B-field for our experiment, we have two options to choose from:
- Permanent Magnets
Before I choose a path, I'd like to do a quick study to determine the cost of building a magnet with a 1 Tesla flux density through a 1" x 1" area. If more than 1 Tesla is needed, we can approximate the cost as a linear function of flux density.
Using Permanent Magnets:
Benefits of using permanent magnets are:
- Different sizes, shapes, and strengths readily available
- Stacking smaller magnets is equivalent to a single magnet of the same thickness
- Setup would require a simple mounting fixture
- If using multiple small magnets, the B-field will not be uniform in certain places (compared to a larger permanent magnet or electromagnet) due to the gaps between the magnets. (Not a show stopper)
- Can get expensive as the number of magnets needed is increased to increase the B-field.
Example Jig set up:
- Using the B884-N52 rectangular magnets stacked in two rows, we can get a B-Field of ~ 1 Tesla (0.99 Tesla)
- Total cost would be ~$30. The jig would be made from scrap wood I have laying around.
Analysis using an electromagnet coming in the next log...