Magnetic couplings are used in many purposes within pump, chemical, pharmaceutical, course of and security industries. They are usually used with the aim of decreasing wear, sealing of liquids from the environment, cleanliness wants or as a safety issue to brake over if torque suddenly rises.
The most common magnetic couplings are made with an outer and inner drive, each construct up with Neodymium magnets to have the ability to get the very best torque density as potential. By optimizing the diameter, air hole, magnet dimension, number of poles and choice of magnet grade, it’s attainable to design a magnetic coupling that suits any software in the range from few millinewton meter up to a quantity of hundred newton meters.
When solely optimizing for top torque, the designers often tend to forget contemplating the affect of temperature. If the designer refers to the Curie point of the individual magnets, he will claim that a Neodymium magnet would fulfill the necessities up to greater than 300°C. Concurrently, it is very important include the temperature dependencies on the remanence, which is seen as a reversible loss – typically round 0,11% per degree Celsius the temperature rises.
Furthermore, a neodymium magnet is under stress during operation of the magnetic coupling. This implies that irreversible demagnetization will happen lengthy earlier than the Curie point has been reached, which usually limits the use of Neodymium-based magnetic coupling to temperatures beneath 150°C.
If higher temperatures are required, magnetic couplings made from Samarium Cobalt magnets (SmCo) are sometimes used. SmCo just isn’t as sturdy as Neodymium magnets however can work as a lot as 350°C. Furthermore, the temperature coefficient of SmCo is only zero,04% per degree Celsius which signifies that it can be used in applications where performance stability is needed over a larger temperature interval.
New generation 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 help from the Danish Innovation Foundation.
The purpose of the project was to develop a magnetic coupling that could expand the working temperature space to succeed in temperatures of molten salts around 600°C. By exchanging the inner drive with a magnetic material containing a higher Curie level and boosting the magnetic field of the outer drive with particular magnetic designs; it was potential to develop a magnetic coupling that began at a lower torque level at room temperature, but only had a minor reduction in torque degree as a function of temperature. This resulted in superior performance above 160°C, regardless of if the benchmark was against a Neodymium- or Samarium Cobalt-based system. This may be seen in Figure 1, where it is shown that the torque degree of the High Hot drives has been tested up to 590°C on the internal drive and still performed with an almost linear discount in torque.
The graph also shows 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 bigger temperature interval.
เกจวัดแรงดันแก๊สlpg At Sintex, the R&D department continues to be developing on the expertise, however they need to be challenged on torque degree at either different temperature, dimensions of the magnetic coupling or new functions that have not beforehand been potential with commonplace magnetic couplings, to find a way to harvest the full potential of the High Hot technology.
The High Hot coupling just isn’t seen as a standardized shelf product, however as a substitute as custom-built by which is optimized for particular functions. Therefore, further growth might be made in close collaboration with new partners.
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