Magnetic coupling at elevated temperatures

Magnetic couplings are used in many purposes within pump, chemical, pharmaceutical, process and security industries. They are sometimes used with the aim of lowering wear, sealing of liquids from the surroundings, cleanliness wants or as a safety issue to brake over if torque suddenly rises.
The commonest magnetic couplings are made with an outer and inside drive, each construct up with Neodymium magnets so as to get the very best torque density as attainable. By optimizing เกจไนโตรเจนsumo , air gap, magnet measurement, number of poles and selection of magnet grade, it is potential to design a magnetic coupling that fits any utility within the vary from few millinewton meter as much as several hundred newton meters.
When only optimizing for top torque, the designers often are inclined to overlook considering the influence of temperature. If the designer refers to the Curie point of the person magnets, he’ll declare that a Neodymium magnet would fulfill the requirements as much as more than 300°C. Concurrently, it is essential to embody the temperature dependencies on the remanence, which is seen as a reversible loss – sometimes round zero,11% per diploma Celsius the temperature rises.
Furthermore, ที่วัดแรงดันน้ำ is beneath strain throughout operation of the magnetic coupling. This means that irreversible demagnetization will occur lengthy before the Curie level has been reached, which typically limits the usage of Neodymium-based magnetic coupling to temperatures below 150°C.
If larger temperatures are required, magnetic couplings manufactured from Samarium Cobalt magnets (SmCo) are typically used. SmCo just isn’t as strong as Neodymium magnets but can work as much as 350°C. Furthermore, the temperature coefficient of SmCo is only zero,04% per diploma Celsius which signifies that it can be utilized in purposes the place performance stability is needed over a larger temperature interval.
New era In collaboration with Copenhagen Atomics, Alfa Laval, Aalborg CSP and the Technical University of Denmark a model new technology of magnetic couplings has been developed by Sintex with support from the Danish Innovation Foundation.
The purpose of the challenge was to develop a magnetic coupling that could broaden the working temperature area to reach temperatures of molten salts around 600°C. By exchanging the inside drive with a magnetic materials containing a better Curie level and boosting the magnetic field of the outer drive with special magnetic designs; it was possible to develop a magnetic coupling that began at a lower torque degree at room temperature, however only had a minor reduction in torque degree as a operate of temperature. This resulted in superior performance above 160°C, irrespective of if the benchmark was in opposition to a Neodymium- or Samarium Cobalt-based system. This may be seen in Figure 1, where it is shown that the torque level of the High Hot drives has been examined as a lot as 590°C on the internal drive and still carried out with an virtually linear discount in torque.
The graph also shows that the temperature coefficient of the High Hot coupling is even lower than for the SmCo-system, which opens a decrease temperature market the place efficiency stability is essential over a larger temperature interval.
Conclusion At Sintex, the R&D department remains to be creating on the know-how, however they have to be challenged on torque level at either totally different temperature, dimensions of the magnetic coupling or new purposes that haven’t previously been potential with commonplace magnetic couplings, in order to harvest the complete potential of the High Hot know-how.
The High Hot coupling is not seen as a standardized shelf product, but instead as custom-built by which is optimized for particular functions. Therefore, further improvement shall be made in close collaboration with new companions.
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