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Magnetic coupling at elevated temperatures

Magnetic couplings are used in many purposes within pump, chemical, pharmaceutical, process and security industries. They are typically used with the aim of lowering put on, sealing of liquids from the surroundings, cleanliness needs or as a safety factor to brake over if torque all of a sudden rises.
The commonest magnetic couplings are made with an outer and inside drive, both construct up with Neodymium magnets so as to get the very best torque density as potential. By optimizing the diameter, air hole, magnet size, variety of poles and selection of magnet grade, it’s potential to design a magnetic coupling that fits any software within the range from few millinewton meter up to several hundred newton meters.
When only optimizing for high torque, the designers usually tend to overlook considering the affect of temperature. If the designer refers to the Curie point of the person magnets, he’ll claim that a Neodymium magnet would fulfill the necessities as a lot as greater than 300°C. Concurrently, it is necessary to embrace the temperature dependencies on the remanence, which is seen as a reversible loss – usually round zero,11% per degree Celsius the temperature rises.
Furthermore, ตัววัดแรงดัน is beneath pressure throughout operation of the magnetic coupling. This implies that irreversible demagnetization will happen lengthy earlier than the Curie level has been reached, which typically limits using Neodymium-based magnetic coupling to temperatures below 150°C.
If higher temperatures are required, magnetic couplings made from Samarium Cobalt magnets (SmCo) are sometimes used. SmCo isn’t as sturdy as Neodymium magnets however can work as much as 350°C. Furthermore, the temperature coefficient of SmCo is just 0,04% per degree Celsius which means that it may be utilized in purposes where efficiency stability is needed over a bigger temperature interval.
New technology In collaboration with Copenhagen Atomics, Alfa Laval, Aalborg CSP and the Technical University of Denmark a new technology of magnetic couplings has been developed by Sintex with help from the Danish Innovation Foundation.
The function of the venture was to develop a magnetic coupling that would increase the working temperature area to achieve temperatures of molten salts round 600°C. By exchanging the inner drive with a magnetic materials containing a higher Curie point and boosting the magnetic area of the outer drive with special magnetic designs; it was attainable to develop a magnetic coupling that began at a decrease torque stage at room temperature, but solely 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 towards a Neodymium- or Samarium Cobalt-based system. This can be seen in Figure 1, where it’s proven that the torque level of the High Hot drives has been tested as much as 590°C on the inner drive and still performed with an nearly linear discount 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 remains to be growing on the technology, but they must be challenged on torque stage at either completely different temperature, dimensions of the magnetic coupling or new applications that have not previously been attainable with standard magnetic couplings, to have the ability to harvest the full potential of the High Hot know-how.
The High Hot coupling is not seen as a standardized shelf product, but as a substitute as custom-built by which is optimized for particular applications. Therefore, further improvement shall be made in shut collaboration with new partners.
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