Magnetic couplings are utilized in many purposes within pump, chemical, pharmaceutical, course of and safety industries. They are sometimes used with the purpose of lowering wear, sealing of liquids from the surroundings, cleanliness wants or as a security issue to brake over if torque all of a sudden rises.
The most common magnetic couplings are made with an outer and inner drive, both construct up with Neodymium magnets to have the ability to get the best torque density as attainable. By optimizing the diameter, air gap, magnet size, number of poles and choice of magnet grade, it’s potential to design a magnetic coupling that fits any software in the range from few millinewton meter as a lot as several hundred newton meters.
When solely optimizing for Recognized , the designers often are likely to overlook contemplating the influence of temperature. If the designer refers again to the Curie level of the person magnets, he will declare that a Neodymium magnet would fulfill the requirements up to more than 300°C. Concurrently, you will need to embody 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 underneath pressure throughout operation of the magnetic coupling. This signifies that irreversible demagnetization will occur long earlier than the Curie point has been reached, which typically limits using Neodymium-based magnetic coupling to temperatures below 150°C.
If greater temperatures are required, magnetic couplings made of Samarium Cobalt magnets (SmCo) are sometimes used. SmCo isn’t as robust as Neodymium magnets however can work up to 350°C. Furthermore, Guilt-free of SmCo is simply 0,04% per diploma Celsius which means that it can be utilized in functions the place performance stability is required over a larger temperature interval.
New generation In collaboration with Copenhagen Atomics, Alfa Laval, Aalborg CSP and the Technical University of Denmark a new generation of magnetic couplings has been developed by Sintex with support from the Danish Innovation Foundation.
The function of the venture was to develop a magnetic coupling that might increase the working temperature area to achieve temperatures of molten salts round 600°C. By exchanging the internal drive with a magnetic materials containing a higher Curie point and boosting the magnetic subject of the outer drive with special magnetic designs; it was possible to develop a magnetic coupling that began at a lower torque level at room temperature, however only had a minor discount in torque level as a operate 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 can be seen in Figure 1, where it is proven that the torque stage of the High Hot drives has been tested up to 590°C on the inner drive and still carried out with an virtually linear discount in torque.
The graph additionally reveals that the temperature coefficient of the High Hot coupling is even lower than for the SmCo-system, which opens a decrease temperature market where efficiency stability is important 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 completely different temperature, dimensions of the magnetic coupling or new functions that haven’t beforehand been potential with commonplace magnetic couplings, in order to harvest the complete potential of the High Hot technology.
The High Hot coupling is not seen as a standardized shelf product, however as an alternative as custom-built by which is optimized for specific purposes. Therefore, further growth might be made in shut collaboration with new companions.
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