Magnetic coupling at elevated temperatures

เกจวัดแรงดันอาร์กอน are used in many functions inside pump, chemical, pharmaceutical, course of and safety industries. They are typically used with the aim of lowering wear, sealing of liquids from the environment, cleanliness wants or as a security issue to brake over if torque suddenly rises.
The most common magnetic couplings are made with an outer and inner drive, each build up with Neodymium magnets so as to get the best torque density as potential. By optimizing the diameter, air hole, magnet size, variety of poles and selection of magnet grade, it is potential to design a magnetic coupling that fits any application within the vary from few millinewton meter up to several hundred newton meters.
When only optimizing for prime torque, the designers typically are inclined to neglect considering the influence of temperature. If the designer refers to the Curie point of the person magnets, he will declare that a Neodymium magnet would fulfill the requirements as much as greater than 300°C. Concurrently, it could be very important embody the temperature dependencies on the remanence, which is seen as a reversible loss – sometimes round 0,11% per diploma Celsius the temperature rises.
Furthermore, a neodymium magnet is under strain during operation of the magnetic coupling. This means that irreversible demagnetization will occur long before the Curie point has been reached, which generally limits the use of Neodymium-based magnetic coupling to temperatures beneath 150°C.
If higher temperatures are required, magnetic couplings made of Samarium Cobalt magnets (SmCo) are sometimes used. SmCo is not as robust as Neodymium magnets but can work up to 350°C. Furthermore, the temperature coefficient of SmCo is simply zero,04% per diploma Celsius which means that it can be utilized in applications the place efficiency stability is required over a bigger temperature interval.
New technology In collaboration with Copenhagen Atomics, Alfa Laval, Aalborg CSP and the Technical University of Denmark a brand new technology of magnetic couplings has been developed by Sintex with help from the Danish Innovation Foundation.
The function of the venture was to develop a magnetic coupling that would broaden the working temperature space to reach temperatures of molten salts round 600°C. By exchanging the inside drive with a magnetic material containing a better Curie level and boosting the magnetic area of the outer drive with particular magnetic designs; it was possible to develop a magnetic coupling that began at a decrease torque stage at room temperature, but only had a minor reduction in torque stage as a operate of temperature. This resulted in superior performance above 160°C, regardless of 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 level of the High Hot drives has been tested as a lot as 590°C on the inner drive and still performed with an nearly linear reduction in torque.
The graph additionally shows that the temperature coefficient of the High Hot coupling is even decrease than for the SmCo-system, which opens a decrease temperature market the place performance stability is essential over a larger temperature interval.
Conclusion At Sintex, the R&D division remains to be developing on the technology, however they must be challenged on torque stage at either totally different temperature, dimensions of the magnetic coupling or new applications that have not previously been possible with commonplace 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 instead as custom-built by which is optimized for particular purposes. Therefore, additional development shall be made in shut collaboration with new companions.

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