Magnetic couplings are used in many purposes inside pump, chemical, pharmaceutical, process and safety industries. They are typically used with the purpose of reducing put on, sealing of liquids from the environment, cleanliness needs or as a security issue to brake over if torque suddenly rises.
The commonest magnetic couplings are made with an outer and inside drive, each construct up with Neodymium magnets in order to get the highest torque density as possible. By optimizing the diameter, air hole, magnet measurement, variety of poles and choice of magnet grade, it’s possible to design a magnetic coupling that fits any application in the vary from few millinewton meter as much as a number of hundred newton meters.
When solely optimizing for prime torque, the designers typically tend 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 necessities as much as greater than 300°C. Concurrently, you will want to embody the temperature dependencies on the remanence, which is seen as a reversible loss – typically around 0,11% per degree Celsius the temperature rises.
Furthermore, a neodymium magnet is underneath strain throughout operation of the magnetic coupling. This means that irreversible demagnetization will happen lengthy earlier than the Curie point has been reached, which usually limits the utilization of Neodymium-based magnetic coupling to temperatures below 150°C.
If larger temperatures are required, magnetic couplings made from Samarium Cobalt magnets (SmCo) are usually used. SmCo is not as sturdy as Neodymium magnets but can work as a lot as 350°C. Furthermore, the temperature coefficient of SmCo is simply zero,04% per degree Celsius which signifies that it can be utilized in purposes the place efficiency stability is needed over a larger temperature interval.
New era 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 help from the Danish Innovation Foundation.
The function of the venture was to develop a magnetic coupling that would broaden the working temperature area to reach temperatures of molten salts around 600°C. By exchanging the internal drive with a magnetic materials containing a better Curie point and boosting the magnetic area of the outer drive with particular magnetic designs; it was potential to develop a magnetic coupling that started at a lower torque stage at room temperature, however only had a minor discount in torque level as a operate of temperature. This resulted in superior performance above 160°C, regardless of if the benchmark was against a Neodymium- or Samarium Cobalt-based system. This can be seen in Figure 1, the place it’s shown that the torque level of the High Hot drives has been examined up to 590°C on the inner drive and nonetheless performed with an nearly linear reduction in torque.
The graph also reveals that the temperature coefficient of the High Hot coupling is even lower than for the SmCo-system, which opens a decrease temperature market where performance stability is necessary over a larger temperature interval.
Conclusion At Sintex, the R&D division continues to be creating on the know-how, however they must be challenged on torque level at both completely different temperature, dimensions of the magnetic coupling or new functions that haven’t beforehand been possible with commonplace magnetic couplings, so as to harvest the complete potential of the High Hot technology.
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