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Permanent magnet motor using demagnetization main causes and prevention methods in _ ndfeb strong magnet manufacturers

by:Newland     2020-04-04
Once the permanent magnet motor excitation-loss, basically can only choose to replace the motor, the maintenance cost is a lot of, how to judge the permanent magnet motor magnetic loss, may be due to what? Ndfeb strong magnet manufacturers small make up to you today say motor cause permanent magnet demagnetization in practical use of the three main reasons. A, the permanent magnet material itself causes of demagnetization we currently use servo motor are ndfeb permanent magnets ( Arc) , ndfeb permanent magnets with high remanence, high intrinsic coercivity, highest permanent magnet is magnetic, and high content in rare earth neodymium, iron, boron, cheap, and cobalt containing no strategic materials. But the deficiency of ndfeb permanent magnet material is thermal stability is poor, we use the magnetic steel grades for N38SH ndfeb permanent magnets heat resistance at 150 ℃, as long as the temperature over 150 ℃, it will cause irreversible demagnetization, in addition to all ndfeb permanent magnets have a lot of iron, neodymium metal materials, surface oxidation, tend to have epoxy coating or electrophoretic coating, electroplating, if the coating process is unqualified, in use process will occur because of the partial oxidation of permanent magnet demagnetization. Second, the motor design is not reasonable if do not know enough about motor working condition, when the design makes the actual working point below the demagnetization curve inflection point, so will be irreversible demagnetization in use process, and design calculation of the point are usually tend to be the average working point of permanent magnet, and due to differences in local permanent magnet material, also have to calculate the maximum of permanent magnet demagnetization working point. And the motor design to fully consider the internal temperature is within the 105 k, if beyond this range, also will cause irreversible demagnetization. Three, demagnetization motor caused by the use of improper use of conditions, especially the high temperature or in the case of mechanical vibrations, may lead to motor magnets demagnetization; In addition, electric captain time overload due will also make motor temperature is too high and produce irreversible demagnetization. The above is the motor used in the three most common cause of demagnetization. PS: how to prevent permanent magnet motor demagnetization? 1. The correct selection of permanent magnet motor power of 2. Avoid overloading starting and frequent starting 3. Improved design ( 1) Appropriate to increase the thickness of the permanent magnet ( 2) Have ventilation inside the rotor slot circuit, reducing the rotor temperature rise of ndfeb strong magnet manufacturers engaged in a given priority to with rare earth ndfeb magnets, development, production and sales of high-tech enterprises. The main production & other; High performance sintered ndfeb, samarium cobalt and other rare earth permanent magnet and products, have been able to mass production of N - N, NH, NSH, NUH, NEH sintered ndfeb, samarium cobalt and other magnetic products.
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