Magnetic coupling at elevated temperatures

Magnetic couplings are utilized in many applications inside pump, chemical, pharmaceutical, course of and safety industries. They are sometimes used with the aim of decreasing put on, sealing of liquids from the setting, cleanliness needs or as a safety factor to brake over if torque all of a sudden rises.
เกจ์อาร์กอนsumo are made with an outer and inside drive, each build up with Neodymium magnets to find a way to get the best torque density as attainable. By optimizing the diameter, air hole, magnet dimension, variety of poles and selection of magnet grade, it’s potential to design a magnetic coupling that suits any utility within the range from few millinewton meter as a lot as a quantity of hundred newton meters.
When solely optimizing for prime torque, the designers typically are inclined to forget considering the influence of temperature. If the designer refers again to the Curie point of the person magnets, he will claim that a Neodymium magnet would fulfill the necessities up to greater than 300°C. Concurrently, it is essential to embody the temperature dependencies on the remanence, which is seen as a reversible loss – sometimes around 0,11% per degree Celsius the temperature rises.
Furthermore, a neodymium magnet is underneath pressure throughout operation of the magnetic coupling. This means that irreversible demagnetization will happen lengthy earlier than the Curie point has been reached, which usually limits using Neodymium-based magnetic coupling to temperatures beneath 150°C.
If larger temperatures are required, magnetic couplings made of Samarium Cobalt magnets (SmCo) are typically used. SmCo just isn’t as sturdy as Neodymium magnets however can work as much as 350°C. Furthermore, the temperature coefficient of SmCo is only 0,04% per diploma Celsius which signifies that it may be utilized in applications the place performance stability is required over a bigger temperature interval.
เครื่องมือใช้วัดความดัน In collaboration with Copenhagen Atomics, Alfa Laval, Aalborg CSP and the Technical University of Denmark a brand new era of magnetic couplings has been developed by Sintex with assist from the Danish Innovation Foundation.
The objective of the project was to develop a magnetic coupling that could increase the working temperature space to succeed in temperatures of molten salts around 600°C. By exchanging the inside drive with a magnetic material containing a better Curie point and boosting the magnetic area of the outer drive with particular magnetic designs; it was attainable to develop a magnetic coupling that started at a decrease torque level at room temperature, but solely had a minor discount in torque stage as a perform of temperature. This resulted in superior efficiency above 160°C, no matter if the benchmark was in opposition to a Neodymium- or Samarium Cobalt-based system. This may be seen in Figure 1, the place it’s proven that the torque degree of the High Hot drives has been tested up to 590°C on the inside drive and nonetheless carried out with an virtually linear reduction in torque.
The graph additionally exhibits that the temperature coefficient of the High Hot coupling is even lower than for the SmCo-system, which opens a lower temperature market the place efficiency stability is necessary over a larger temperature interval.
Conclusion At Sintex, the R&D division continues to be developing on the technology, however they have to be challenged on torque degree at both completely different temperature, dimensions of the magnetic coupling or new functions that haven’t beforehand been possible with normal magnetic couplings, in order to harvest the total potential of the High Hot know-how.
The High Hot coupling isn’t seen as a standardized shelf product, however as an alternative as custom-built by which is optimized for specific functions. Therefore, additional improvement might be made in close collaboration with new partners.

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