Magnetic couplings are used in many applications within pump, chemical, pharmaceutical, process and safety industries. They are sometimes used with the aim of reducing put on, sealing of liquids from the setting, cleanliness needs or as a safety issue to brake over if torque suddenly rises.
The commonest magnetic couplings are made with an outer and internal drive, both construct up with Neodymium magnets to find a way to get the best torque density as possible. By optimizing the diameter, air gap, magnet size, number of poles and selection of magnet grade, it’s potential to design a magnetic coupling that suits any application in the vary from few millinewton meter as much as several hundred newton meters.
When only optimizing for top torque, the designers usually tend to neglect considering the affect of temperature. If the designer refers to the Curie point of the individual magnets, he will declare that a Neodymium magnet would fulfill the requirements as a lot as greater than 300°C. Concurrently, it is necessary to include the temperature dependencies on the remanence, which is seen as a reversible loss – usually around 0,11% per diploma Celsius the temperature rises.
Furthermore, a neodymium magnet is beneath pressure throughout operation of the magnetic coupling. This signifies that irreversible demagnetization will happen long earlier than the Curie level has been reached, which generally limits the utilization of Neodymium-based magnetic coupling to temperatures under 150°C.
If larger temperatures are required, magnetic couplings made from Samarium Cobalt magnets (SmCo) are usually used. SmCo is not as sturdy as Neodymium magnets however can work as a lot as 350°C. Furthermore, the temperature coefficient of SmCo is simply 0,04% per degree Celsius which means that it may be utilized in applications where performance stability is needed over a bigger temperature interval.
เกจวัดแรงดันอาร์กอน 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 assist from the Danish Innovation Foundation.
The function of the challenge was to develop a magnetic coupling that would expand the working temperature space to reach temperatures of molten salts round 600°C. By exchanging the internal 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 possible to develop a magnetic coupling that started at a decrease torque stage at room temperature, however only had a minor reduction in torque stage as a operate of temperature. This resulted in superior efficiency above 160°C, no matter if the benchmark was towards a Neodymium- or Samarium Cobalt-based system. This could be seen in Figure 1, the place it’s shown that the torque degree of the High Hot drives has been tested up to 590°C on the inner drive and nonetheless carried out with an virtually 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 decrease temperature market where performance stability is essential over a bigger temperature interval.
Conclusion At Sintex, the R&D department remains to be growing on the know-how, but they need to be challenged on torque degree at both different temperature, dimensions of the magnetic coupling or new applications that have not beforehand been potential with commonplace magnetic couplings, in order to harvest the full potential of the High Hot expertise.
The High Hot coupling just isn’t seen as a standardized shelf product, however as an alternative as custom-built by which is optimized for specific applications. Therefore, additional growth shall be made in shut collaboration with new companions.
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