Magnetic couplings are utilized in many applications within pump, chemical, pharmaceutical, course of and safety industries. They are usually used with the purpose of reducing put on, sealing of liquids from the environment, cleanliness wants or as a security factor to brake over if torque suddenly rises.
The most common magnetic couplings are made with an outer and inner drive, both construct up with Neodymium magnets in order to get the best torque density as possible. By optimizing the diameter, air gap, magnet dimension, number of poles and choice of magnet grade, it is attainable to design a magnetic coupling that fits any utility in the range from few millinewton meter as much as a number of hundred newton meters.
When only optimizing for ราคาเกจวัดแรงดันลม , the designers often are likely to overlook contemplating the affect of temperature. If the designer refers back to the Curie level of the individual magnets, he’ll claim that a Neodymium magnet would fulfill the necessities as much as more than 300°C. Concurrently, you will need to include the temperature dependencies on the remanence, which is seen as a reversible loss – sometimes round 0,11% per diploma Celsius the temperature rises.
Furthermore, a neodymium magnet is beneath strain during operation of the magnetic coupling. This implies that irreversible demagnetization will occur lengthy before the Curie point has been reached, which generally limits the utilization of Neodymium-based magnetic coupling to temperatures below 150°C.
If higher temperatures are required, magnetic couplings manufactured from Samarium Cobalt magnets (SmCo) are sometimes used. SmCo is not as sturdy as Neodymium magnets however can work as a lot as 350°C. Furthermore, the temperature coefficient of SmCo is only zero,04% per degree Celsius which implies that it may be used in functions where efficiency 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 technology of magnetic couplings has been developed by Sintex with support from the Danish Innovation Foundation.
The objective of the project was to develop a magnetic coupling that would expand the working temperature space to achieve temperatures of molten salts round 600°C. By exchanging the inner drive with a magnetic materials containing a higher 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, however solely had a minor discount in torque level as a operate 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 is shown that the torque level of the High Hot drives has been examined as a lot as 590°C on the inside drive and nonetheless performed with an virtually linear reduction in torque.
The graph also reveals that the temperature coefficient of the High Hot coupling is even decrease than for the SmCo-system, which opens a decrease temperature market the place performance stability is essential over a larger temperature interval.
Conclusion At Sintex, the R&D department remains to be developing on the expertise, but they have to be challenged on torque level at both completely different temperature, dimensions of the magnetic coupling or new applications that have not beforehand been potential with standard magnetic couplings, so as to harvest the full potential of the High Hot expertise.
The High Hot coupling just isn’t seen as a standardized shelf product, but as a substitute as custom-built by which is optimized for particular functions. Therefore, additional improvement might be made in close collaboration with new companions.