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Magnetic coupling at elevated temperatures

Magnetic couplings are utilized in many purposes within pump, chemical, pharmaceutical, course of and security industries. They are typically used with the aim of decreasing put on, sealing of liquids from the environment, cleanliness needs or as a safety issue to brake over if torque abruptly rises.
The most common magnetic couplings are made with an outer and internal drive, each construct up with Neodymium magnets in order to get the best torque density as possible. By optimizing the diameter, air gap, magnet dimension, number of poles and selection of magnet grade, it is potential to design a magnetic coupling that suits any application within the vary from few millinewton meter as a lot as several hundred newton meters.
When only optimizing for high torque, the designers typically are most likely to forget considering the affect 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 a lot as greater than 300°C. Concurrently, it is important to embrace the temperature dependencies on the remanence, which is seen as a reversible loss – sometimes around zero,11% per degree Celsius the temperature rises.
Furthermore, a neodymium magnet is under pressure during operation of the magnetic coupling. This means that irreversible demagnetization will happen long before the Curie level has been reached, which generally limits the utilization of Neodymium-based magnetic coupling to temperatures beneath 150°C.
If larger temperatures are required, magnetic couplings manufactured from Samarium Cobalt magnets (SmCo) are usually used. SmCo just isn’t as strong as Neodymium magnets but can work as a lot as 350°C. Furthermore, the temperature coefficient of SmCo is simply 0,04% per degree Celsius which signifies that it may be utilized in functions the place performance stability is needed over a larger temperature interval.
New technology In collaboration with Copenhagen Atomics, Alfa Laval, Aalborg CSP and the Technical University of Denmark a model new era of magnetic couplings has been developed by Sintex with support from the Danish Innovation Foundation.
The purpose of the project was to develop a magnetic coupling that would expand the working temperature area to achieve temperatures of molten salts around 600°C. By exchanging the inside drive with a magnetic materials containing the next 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 lower torque level at room temperature, but only had a minor discount in torque degree as a function of temperature. This resulted in superior performance above 160°C, irrespective of if the benchmark was towards a Neodymium- or Samarium Cobalt-based system. เกจวัดแรงดันดิจิตอลราคา could be seen in Figure 1, where it is shown that the torque level of the High Hot drives has been tested up to 590°C on the inside drive and still performed with an nearly linear discount in torque.
The graph also reveals 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 important over a bigger temperature interval.
Conclusion At Sintex, the R&D department is still growing on the know-how, but they have to be challenged on torque stage at either completely different temperature, dimensions of the magnetic coupling or new purposes that have not previously been attainable with normal 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, however as an alternative as custom-built by which is optimized for particular purposes. Therefore, further growth might be made in close collaboration with new companions.
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