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Magnetic coupling at elevated temperatures

Magnetic couplings are utilized in many functions within pump, chemical, pharmaceutical, course of and security industries. They are usually used with the aim of decreasing put on, sealing of liquids from the environment, cleanliness wants or as a security factor to brake over if torque abruptly rises.
pressure gauge octa are made with an outer and inside drive, each build up with Neodymium magnets so as to get the highest torque density as potential. By optimizing the diameter, air gap, magnet measurement, number of poles and selection 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 number of hundred newton meters.
When only optimizing for prime torque, the designers typically are likely to forget contemplating the affect of temperature. If the designer refers again to the Curie level of the individual magnets, he’ll claim that a Neodymium magnet would fulfill the requirements up to more than 300°C. Concurrently, pressure gauge may be very important embody the temperature dependencies on the remanence, which is seen as a reversible loss – sometimes round zero,11% per degree Celsius the temperature rises.
Furthermore, a neodymium magnet is under stress during operation of the magnetic coupling. digital pressure gauge means that irreversible demagnetization will happen lengthy before the Curie level has been reached, which generally limits the use of Neodymium-based magnetic coupling to temperatures beneath 150°C.
If larger temperatures are required, magnetic couplings manufactured from Samarium Cobalt magnets (SmCo) are usually used. SmCo isn’t as strong as Neodymium magnets but can work up to 350°C. Furthermore, the temperature coefficient of SmCo is simply zero,04% per degree Celsius which signifies that it can be used in applications where 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 new technology of magnetic couplings has been developed by Sintex with support from the Danish Innovation Foundation.
The function of the challenge was to develop a magnetic coupling that could broaden the working temperature space to achieve 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 subject of the outer drive with special magnetic designs; it was potential to develop a magnetic coupling that started at a decrease torque degree at room temperature, however only had a minor discount in torque stage as a operate 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, the place it is shown that the torque stage of the High Hot drives has been examined up to 590°C on the internal drive and still performed with an virtually 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 decrease temperature market where efficiency stability is necessary over a bigger temperature interval.
Conclusion At Sintex, the R&D department is still creating on the know-how, but they must be challenged on torque stage at either totally different temperature, dimensions of the magnetic coupling or new functions that have not previously been attainable with normal magnetic couplings, in order to harvest the total potential of the High Hot technology.
The High Hot coupling isn’t seen as a standardized shelf product, but as an alternative as custom-built by which is optimized for particular functions. Therefore, additional improvement might be made in close collaboration with new companions.
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