Magnetic couplings are utilized in many applications within pump, chemical, pharmaceutical, process and security industries. They are typically used with the purpose of reducing wear, sealing of liquids from the environment, cleanliness wants or as a safety issue to brake over if torque suddenly rises.
The commonest magnetic couplings are made with an outer and inside drive, both construct up with Neodymium magnets so as to get the best torque density as attainable. By optimizing the diameter, air hole, magnet dimension, variety of poles and choice of magnet grade, it is attainable to design a magnetic coupling that suits any utility in the vary from few millinewton meter as a lot as a quantity of hundred newton meters.
When solely optimizing for top torque, the designers typically tend to neglect contemplating the affect of temperature. If the designer refers again to the Curie point of the person magnets, he’ll claim that a Neodymium magnet would fulfill the requirements as a lot as greater than 300°C. Concurrently, you will need to embrace the temperature dependencies on the remanence, which is seen as a reversible loss – sometimes round zero,11% per degree Celsius the temperature rises.
Furthermore, เกจวัดแรงดันแบบแห้ง is beneath strain during operation of the magnetic coupling. This means that irreversible demagnetization will happen lengthy earlier than the Curie point has been reached, which usually limits using Neodymium-based magnetic coupling to temperatures below 150°C.
If greater temperatures are required, magnetic couplings manufactured from Samarium Cobalt magnets (SmCo) are usually used. SmCo is not as robust as Neodymium magnets but can work up to 350°C. Furthermore, the temperature coefficient of SmCo is just 0,04% per diploma Celsius which signifies that it may be used in functions the place performance stability is required over a bigger temperature interval.
New era In collaboration with Copenhagen Atomics, Alfa Laval, Aalborg CSP and the Technical University of Denmark a brand new era of magnetic couplings has been developed by Sintex with support from the Danish Innovation Foundation.
The objective of the venture was to develop a magnetic coupling that could expand the working temperature space to succeed in 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 attainable to develop a magnetic coupling that started at a decrease torque stage at room temperature, but solely had a minor discount in torque level as a operate 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 may be seen in Figure 1, where it is proven that the torque degree of the High Hot drives has been examined as much as 590°C on the inner drive and nonetheless carried out with an nearly linear discount in torque.
The graph additionally reveals that the temperature coefficient of the High Hot coupling is even decrease than for the SmCo-system, which opens a lower temperature market where efficiency stability is essential over a larger temperature interval.
Conclusion At Sintex, the R&D department remains to be developing on the technology, however they must be challenged on torque stage at either completely different temperature, dimensions of the magnetic coupling or new functions that haven’t beforehand been potential with standard magnetic couplings, so as to harvest the complete potential of the High Hot expertise.
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 specific functions. Therefore, additional development will be made in shut collaboration with new companions.
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