Magnetic couplings are utilized in many purposes within pump, chemical, pharmaceutical, process and security industries. They are typically used with the purpose of decreasing put on, sealing of liquids from the surroundings, cleanliness needs or as a security issue to brake over if torque suddenly rises.
The most common magnetic couplings are made with an outer and internal drive, each construct up with Neodymium magnets to have the ability 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 suits any application in the vary from few millinewton meter up to several hundred newton meters.
When only optimizing for prime torque, the designers typically tend to forget considering the affect of temperature. If the designer refers to the Curie level of the person magnets, he’ll claim that a Neodymium magnet would fulfill the necessities as much as greater than 300°C. Concurrently, เกจวัดแรงดันเชื้อเพลิง is necessary to include the temperature dependencies on the remanence, which is seen as a reversible loss – sometimes round zero,11% per diploma Celsius the temperature rises.
Furthermore, a neodymium magnet is under pressure throughout operation of the magnetic coupling. This implies that irreversible demagnetization will happen long before the Curie level has been reached, which typically limits the usage of Neodymium-based magnetic coupling to temperatures below 150°C.
If higher temperatures are required, magnetic couplings made of Samarium Cobalt magnets (SmCo) are typically used. SmCo is not as robust as Neodymium magnets however can work up to 350°C. Furthermore, the temperature coefficient of SmCo is just 0,04% per diploma Celsius which means that it can 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 new generation of magnetic couplings has been developed by Sintex with support from the Danish Innovation Foundation.
The objective of the challenge was to develop a magnetic coupling that could broaden the working temperature space to succeed in temperatures of molten salts around 600°C. By exchanging the internal drive with a magnetic materials containing a better Curie level and boosting the magnetic field of the outer drive with special magnetic designs; it was possible to develop a magnetic coupling that started at a lower torque degree at room temperature, however only had a minor reduction in torque degree as a operate of temperature. This resulted in superior efficiency above 160°C, regardless of if the benchmark was in opposition to a Neodymium- or Samarium Cobalt-based system. This may be seen in Figure 1, the place it’s proven that the torque stage of the High Hot drives has been examined up to 590°C on the inside drive and nonetheless carried out with an nearly linear reduction in torque.
The graph also shows that the temperature coefficient of the High Hot coupling is even decrease than for the SmCo-system, which opens a lower temperature market the place efficiency stability is important over a bigger temperature interval.
Conclusion At Sintex, the R&D division is still growing on the know-how, but they need to be challenged on torque stage at either completely different temperature, dimensions of the magnetic coupling or new purposes that have not previously been attainable with normal magnetic couplings, in order to harvest the full potential of the High Hot technology.
The High Hot coupling is not seen as a standardized shelf product, however as a substitute as custom-built by which is optimized for specific functions. Therefore, additional growth might be made in shut collaboration with new companions.
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