Neodymium disc magnets are mainly composed of neodymium, iron and boron. They have the characteristics of high remanence, high coercivity and excellent magnetic energy product. The third generation of rare earth permanent magnet NdFeB (NdFeB) is the strongest permanent magnet in contemporary magnets. It not only has the characteristics of high remanence, high coercivity, high magnetic energy product, high-performance price and so on, but also is easy to be processed into various sizes. It has been widely used in aerospace, electronic electro-acoustic, instrumentation, process jewelry, leather handbags, packaging boxes, toys, medical technology and other devices requiring permanent magnet field, especially suitable for the development of high-performance, miniaturized, lightweight replacement products.
The reason why the magnet is magnetic is that there are many small magnetic moments in the magnet material, and then these magnetic moments are arranged in parallel. The magnetic moment refers to the direction of the N pole, and the opposite direction is the S pole.
Then we do this to judge the magnetic pole of the wafer magnet, in fact, the wafer magnet is not magnetic before magnetization, we need to know the distribution of the magnetic pole after magnetization, to formally measure the size of the magnetic pole, the general direction of magnetization it has many kinds of, axial magnetization, radial magnetization, large surface magnetization, multi-pole magnetization and so on. Depending on the way of magnetization we can get different pole directions.
Hypothesis: 1: some of the torus above the ring is thickness magnetization. 2: Some in the side diameter of the magnetization is axial multistage magnetization.
The magnetic sensing line is a closed curve. The direction of the North Pole of the small magnetic needle is defined as the direction of the magnetic sensing line. All the lines around the magnet go from the N pole to the S pole, and inside the magnet the lines go from the S pole to the N pole.
In the ring plane are: a cross in the ring, a point outside the ring; Or, inside the ring, outside the ring cross. The magnetic poles are respectively in a circular ring or a circular cake magnet, the distribution of the external magnetic field is basically similar, but for the neodymium disc magnets wholesale, the space inside the ring still belongs to the distribution range of the external magnetic field, so part of the magnetic sensing line through the inner hole of the magnetic ring to connect the magnetic poles at both ends.