Use of rare earth permanent magnet materials: applied to computers, automobiles, instruments, meters, household appliances, petrochemical, health care, aerospace and other industries in a variety of microtome motors, nuclear magnetic *** vibration equipment, electrical appliances, magnetic separation equipment, magnetic machinery, magnetic therapy equipment and other components that need to generate a strong gap magnetic field.
The rare earth family is from the lanthanide system of 15 elements, plus scandium and yttrium closely related to the lanthanide system *** 17 elements. They are: lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, scandium, and yttrium. The largest user of neodymium metal is the NdFeB permanent magnet material. The introduction of NdFeB permanent magnets has injected new vitality and vigor into the field of rare earth high technology. NdFeB magnets have a high magnetic energy product, known as the contemporary "king of permanent magnets", and are widely used in electronics, machinery and other industries for their excellent performance.
One of the most important functions of NdFeB magnets is permanent magnetism. The so-called permanent magnetism doesn't mean that the original magnetic state can be maintained forever without any change, but that its magnetic properties are relatively stable and the decay period is relatively long.
Rare-earth permanent magnet magnetic circuit structure and design calculation
In order to give full play to the magnetic properties of various permanent magnet materials, especially the excellent magnetic properties of rare-earth permanent magnets, and to manufacture cost-effective permanent magnet motors, it is not possible to simply apply the structure and design calculation methods of traditional permanent magnet motors or electrically-excited motors, and it is necessary to establish a new design concept. Instead, a new design concept must be established, and the magnetic circuit structure must be reanalyzed and improved.
With the rapid development of computer hardware and software technology, as well as electromagnetic field numerical calculations, optimization design and simulation technology and other modern design methods continue to improve, through the motor academic and engineering community **** with the efforts of the design theory of permanent magnet motors, computational methods, structural processes and control technology has made breakthroughs, formed a combination of numerical calculations of electromagnetic field and equivalent magnetic circuit analytical solution. A set of analysis and research methods and computer-aided analysis and design software combining numerical calculation of electromagnetic field and analytical solution of equivalent magnetic circuit have been formed and are being continuously improved.
The above content refers to Baidu Encyclopedia-rare earth permanent magnet