Magnetic couplings are utilized in many functions inside pump, chemical, pharmaceutical, process and security industries. They are typically used with the aim of decreasing wear, sealing of liquids from the setting, cleanliness wants or as a security issue to brake over if torque abruptly rises.
The most typical magnetic couplings are made with an outer and inside drive, both build up with Neodymium magnets in order to get the highest torque density as possible. By optimizing the diameter, air gap, magnet size, number of poles and choice of magnet grade, it is potential to design a magnetic coupling that suits any utility in the range from few millinewton meter up to several hundred newton meters.
When only optimizing for ไดอะแฟรม , the designers usually tend to forget contemplating the affect of temperature. If the designer refers back to the Curie level of the person magnets, he’ll declare that a Neodymium magnet would fulfill the necessities as much as greater than 300°C. Concurrently, it may be very important embody the temperature dependencies on the remanence, which is seen as a reversible loss – typically around zero,11% per degree Celsius the temperature rises.
Furthermore, a neodymium magnet is beneath pressure throughout operation of the magnetic coupling. This signifies that irreversible demagnetization will occur long before the Curie point 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 sometimes used. SmCo isn’t as strong as Neodymium magnets but can work as a lot as 350°C. Furthermore, the temperature coefficient of SmCo is simply zero,04% per degree Celsius which signifies that it might be utilized in functions where efficiency stability is needed over a bigger temperature interval.
New generation In collaboration with Copenhagen Atomics, Alfa Laval, Aalborg CSP and the Technical University of Denmark a new era of magnetic couplings has been developed by Sintex with assist from the Danish Innovation Foundation.
The purpose of the project was to develop a magnetic coupling that could expand the working temperature area to achieve temperatures of molten salts around 600°C. By exchanging the internal drive with a magnetic material containing the next Curie level and boosting the magnetic field of the outer drive with special magnetic designs; it was attainable to develop a magnetic coupling that started at a decrease torque degree at room temperature, but solely had a minor discount in torque level 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. This could be seen in Figure 1, where it’s proven that the torque degree of the High Hot drives has been tested as much as 590°C on the inside drive and still carried out with an nearly linear discount in torque.
The graph additionally shows that the temperature coefficient of the High Hot coupling is even lower than for the SmCo-system, which opens a lower temperature market where efficiency stability is necessary over a bigger temperature interval.
Conclusion At Sintex, the R&D department continues to be developing on the expertise, but they must be challenged on torque level at either different temperature, dimensions of the magnetic coupling or new purposes that have not previously been possible with normal magnetic couplings, so as to harvest the complete potential of the High Hot technology.
The High Hot coupling isn’t seen as a standardized shelf product, however as a substitute as custom-built by which is optimized for specific functions. Therefore, further growth might be made in shut collaboration with new partners.