The rare earth group is lanthanide 15 element, plus scandium and yttrium *** 17 elements closely related to lanthanide. They are lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, scandium and yttrium. The biggest user of neodymium metal is NdFeB permanent magnet material. The advent of NdFeB permanent magnets has injected new vitality into the high-tech field of rare earth. NdFeB magnets are known as the "king of permanent magnets" because of their high magnetic energy product, and are widely used in electronics, machinery and other industries for their excellent performance.
One of the important functions is permanent magnet. The so-called permanent magnet cannot keep its original magnetic state forever, but its magnetism is relatively stable and its decay period is relatively long.
Magnetic circuit structure and design calculation of rare earth permanent magnet
In order to give full play to the magnetic properties of all kinds of permanent magnet materials, especially the excellent magnetic properties of rare earth permanent magnets, and manufacture a permanent magnet motor with high cost performance, it is necessary to establish a new design concept, re-analyze and improve the magnetic circuit structure, instead of simply applying the structure and design calculation method of traditional permanent magnet motors or electrically excited motors.
With the rapid development of computer software and hardware technology, modern design methods such as electromagnetic field numerical calculation, optimization design and simulation technology have been continuously improved. With the joint efforts of motor academic and engineering circles, the design theory, calculation method, structure technology and control technology of permanent magnet motor have made breakthroughs, forming a set of analysis and research methods and computer-aided analysis and design software combining electromagnetic field numerical calculation with equivalent magnetic circuit analytical solution, which are being continuously improved.
The above contents refer to Baidu Encyclopedia-Rare Earth Permanent Magnet.