Magnetic couplings are used in many functions within pump, chemical, pharmaceutical, course of and security industries. They are sometimes used with the aim of lowering wear, sealing of liquids from the setting, cleanliness needs or as a security factor to brake over if torque abruptly rises.
The most common magnetic couplings are made with an outer and inside drive, each build up with Neodymium magnets in order to get the very best torque density as possible. By optimizing the diameter, air gap, magnet size, variety of poles and choice of magnet grade, it’s attainable to design a magnetic coupling that fits any software in the vary from few millinewton meter as much as a quantity of hundred newton meters.
When solely optimizing for top torque, the designers often are inclined to overlook contemplating the influence of temperature. If the designer refers again to the Curie level of the person magnets, he’ll declare that a Neodymium magnet would fulfill the necessities as a lot as more than 300°C. Concurrently, it could be very important include the temperature dependencies on the remanence, which is seen as a reversible loss – sometimes round zero,11% per diploma Celsius the temperature rises.
Furthermore, a neodymium magnet is underneath strain throughout operation of the magnetic coupling. This means that irreversible demagnetization will occur long before the Curie point has been reached, which usually limits the usage of 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 just isn’t as strong as Neodymium magnets but can work as much as 350°C. Furthermore, the temperature coefficient of SmCo is simply zero,04% per degree Celsius which implies that it may be used in functions the place efficiency stability is required 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 technology of magnetic couplings has been developed by Sintex with support from the Danish Innovation Foundation.
pressure gauge หลักการ ทํา งาน of the venture was to develop a magnetic coupling that would increase the working temperature space to achieve temperatures of molten salts round 600°C. By exchanging the inner drive with a magnetic materials containing the next Curie level 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 degree at room temperature, however only had a minor reduction in torque degree as a operate of temperature. This resulted in superior efficiency above 160°C, irrespective of if the benchmark was in opposition to a Neodymium- or Samarium Cobalt-based system. This could 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 internal drive and still carried out with an nearly linear reduction in torque.
The graph also exhibits that the temperature coefficient of the High Hot coupling is even decrease than for the SmCo-system, which opens a lower temperature market where performance stability is essential over a larger temperature interval.
Conclusion At Sintex, the R&D department continues to be creating on the expertise, but they need to be challenged on torque degree at either different temperature, dimensions of the magnetic coupling or new applications that have not beforehand been possible with normal magnetic couplings, so as to harvest the complete potential of the High Hot technology.
The High Hot coupling just isn’t seen as a standardized shelf product, but as a substitute as custom-built by which is optimized for specific functions. Therefore, additional growth will be made in close collaboration with new companions.
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