How to define the performance of the magnet?
Mainly has the following three performance parameters to determine the performance of the magnet: remanence Br: permanent magnets by the saturation magnetization to technology, and remove the external magnetic field, the retention of Br is called residual magnetic induction intensity.
Coercive force Hc: make the saturation magnetization to the technology of permanent magnet B down to zero, need to add the reverse magnetic field intensity is called magnetic coercive force, referred to as coercive force.
Magnetic energy product BH: represents the magnet in the air gap space (
Two pole magnet space)
The magnetic energy density, air gap the magnetostatic energy per unit volume.
Due to the product of the energy is equal to the magnet Bm and Hm, so called magnetic energy product.
Magnetic field: the space of magnetic pole magnetic action of magnetic field on the surface of magnetic field, the magnetic induction intensity at the location on the surface of a permanent magnet how to choose the magnet?
Should be clear before decided to choose which kind of magnet need magnets play what role?
Major role: moving object, fixed object or lift.
The shape of magnet required: wafer form, circular, square shape, tile shape or special shape.
Required for the size of the magnet: long, wide, high, diameter and tolerance, and so on.
Suction of the magnet, the expected price and quantity and so on.
Invented the compass is according to the nature of the magnet magnet effect of 1, 2, motor generator 3, electromagnet electromagnetic relay can do 4, small objects attract light 5, what refers to north and south is the most powerful magnet?
Currently the highest performance of the magnet is rare earth magnets, and in the rare earth magnet ndfeb is the most powerful magnet.
But in more than 200 degrees Celsius environment, samarium cobalt is one of the most powerful magnet.
What is magnet magnet refers to the object or material, can produce magnetic fields traditionally can be divided into 'permanent magnet' and 'non permanent magnet'.
Permanent magnet can be a natural product, also called lodestone, can also be made by artificial (
The most powerful magnet is neodymium magnets)
Rather than permanent magnets, magnetic will be lost.