The field is not static when energized. The hanging ones are not too hard to make with a Hall effect sensor and an electromagnet. This is a good explanation:

The field is not static when energized. The hanging ones are not too hard to make with a Hall effect sensor and an electromagnet. This is a good explanation: https://www.kjmagnetics.com/blog.asp?p=electromagnetic-levitation https://www.kjmagnetics.com/blog.asp?p=electromagnetic-levit...