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Magnetic coupling at elevated temperatures

Magnetic couplings are used in many functions inside pump, chemical, pharmaceutical, course of and security industries. They are usually used with the aim of reducing put on, sealing of liquids from the setting, cleanliness wants or as a safety issue to brake over if torque suddenly rises.
The most typical magnetic couplings are made with an outer and internal drive, both build up with Neodymium magnets so as to get the highest torque density as possible. By optimizing the diameter, air gap, magnet measurement, variety of poles and choice of magnet grade, it is possible to design a magnetic coupling that fits any software within the range from few millinewton meter up to a quantity of hundred newton meters.
When only optimizing for top torque, the designers typically are most likely to neglect contemplating the influence of temperature. If the designer refers to the Curie level of the person magnets, he will declare that a Neodymium magnet would fulfill the necessities as a lot as greater than 300°C. Concurrently, it is very important embody the temperature dependencies on the remanence, which is seen as a reversible loss – typically round zero,11% per degree Celsius the temperature rises.
Furthermore, a neodymium magnet is under pressure throughout operation of the magnetic coupling. This implies that irreversible demagnetization will occur long earlier than the Curie point has been reached, which usually limits using Neodymium-based magnetic coupling to temperatures under 150°C.
If larger temperatures are required, magnetic couplings made from Samarium Cobalt magnets (SmCo) are sometimes used. SmCo is not as sturdy as Neodymium magnets but can work up to 350°C. Furthermore, ชนิดของpressuregauge of SmCo is simply zero,04% per diploma Celsius which means that it can be used in purposes the place performance 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 new era of magnetic couplings has been developed by Sintex with support from the Danish Innovation Foundation.
The purpose of the challenge was to develop a magnetic coupling that might expand the working temperature space to achieve temperatures of molten salts around 600°C. By exchanging the internal drive with a magnetic material containing a higher 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 lower torque stage at room temperature, but solely had a minor reduction in torque degree as a perform of temperature. This resulted in superior performance above 160°C, no matter if the benchmark was against a Neodymium- or Samarium Cobalt-based system. This could be seen in Figure 1, the place 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 carried out with an almost linear reduction in torque.
The graph also shows that the temperature coefficient of the High Hot coupling is even lower than for the SmCo-system, which opens a decrease temperature market the place performance stability is important over a larger temperature interval.
Conclusion At Sintex, the R&D department remains to be developing on the expertise, but they must be challenged on torque stage at both completely different temperature, dimensions of the magnetic coupling or new applications that haven’t previously been attainable with standard magnetic couplings, in order to harvest the full potential of the High Hot expertise.
The High Hot coupling isn’t seen as a standardized shelf product, however as an alternative as custom-built by which is optimized for specific purposes. Therefore, further improvement shall be made in shut collaboration with new partners.