Magnetic couplings are utilized in many functions inside pump, chemical, pharmaceutical, course of and security industries. They are sometimes used with the purpose of lowering put on, sealing of liquids from the environment, cleanliness wants or as a safety factor to brake over if torque suddenly rises.
The most typical magnetic couplings are made with an outer and inner drive, both construct up with Neodymium magnets in order to get the highest torque density as possible. By optimizing the diameter, air gap, magnet dimension, variety of poles and choice of magnet grade, it is possible to design a magnetic coupling that suits any utility within the vary from few millinewton meter up to a number of hundred newton meters.
When only optimizing for high torque, the designers typically are inclined to overlook contemplating the influence of temperature. If the designer refers to the Curie point of the person magnets, he will claim that a Neodymium magnet would fulfill the requirements up to more than 300°C. Concurrently, you will need to embody the temperature dependencies on the remanence, which is seen as a reversible loss – sometimes around zero,11% per diploma Celsius the temperature rises.
Furthermore, เครื่องมือวัดpressure is beneath strain during operation of the magnetic coupling. This implies that irreversible demagnetization will occur long before the Curie level has been reached, which usually 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 typically used. SmCo isn’t as robust as Neodymium magnets however can work as much as 350°C. Furthermore, เกจแรงดันน้ำ of SmCo is only zero,04% per diploma Celsius which implies that it can be used in functions where efficiency 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 new era of magnetic couplings has been developed by Sintex with help from the Danish Innovation Foundation.
The function of the project was to develop a magnetic coupling that might increase 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 point 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 lower torque degree at room temperature, however only had a minor reduction in torque stage as a perform of temperature. This resulted in superior efficiency above 160°C, regardless of if the benchmark was against a Neodymium- or Samarium Cobalt-based system. This could be seen in Figure 1, where it’s proven that the torque level of the High Hot drives has been examined up to 590°C on the inside drive and nonetheless performed with an nearly linear discount 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 essential over a bigger temperature interval.
Conclusion At Sintex, the R&D division is still creating on the technology, however they need to be challenged on torque stage at either different temperature, dimensions of the magnetic coupling or new functions that have not previously been possible with standard magnetic couplings, to be able to harvest the full potential of the High Hot expertise.
The High Hot coupling just isn’t seen as a standardized shelf product, however as an alternative as custom-built by which is optimized for specific applications. Therefore, further growth will be made in close collaboration with new companions.
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