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Magnetic couplings

Sintex a/s is a specialist in the production of permanent magnetic couplings in corrosion-resistant materials. We have always focused on providing maintenance-free solutions with unique advantages - both compared to mechanical solutions and compared to other magnetic solutions.

How does it work?

3D model of magnetic Coupling
Magnetic couplings consist of an outer and an inner drive. There is no contact between the outer and inner drive, the power being transmitted using magnetic forces. This means that the magnetic solution - in contrast to classical mechanical solutions - does not experience any wear.

See figure to the right: 3D model of magnetic coupling

The magnets can be fully enclosed in stainless steel such that it is protected against all external factors and the coupling can operate directly as a wet runner in liquids, if wanted.

It is possible to place a separation can between the two rotating drives to isolate two different medias such as keeping liquid on one side and air on the other side. Sintex provides a unique can with a thickness equal to just four sheets of paper, this allowing for a high energy efficiency while still maintaining a high strength.

Advntages of magnetic coupling2

Uniqueness of magnetic couplings

Sintex magnetic couplings provides a range of advantages - both c

ompared to mechanical solutions and other magnetic solutions. Figure 2 summarize the main advantages.

Permanent magnetic couplings have also been found to permit higher assembly tolerances and self-alignment of two systems compared to mechanical solutions.

 See figure to the right: Advantages of magnetic couplings


Types and characteristics

Sintex magnetic couplings cover a range of different types –disk couplings, classical magnetic couplings (with or without separator cans) as well as our patented powder-based solution with encapsulated magnetic powder.

The couplings can be produced with various types of magnets or magnetic powder depending on the application needs.

Classical magnetic couplings are made with both neodymium magnets, samarium cobalt magnets or a combination of the two – but with no adhesive. These solutions as well as the patented powder-based solutions eliminates construction and recycle challenges. The processes are in various degrees suitable for automated production lines, which is valuable for high volume production.

Most couplings are customer specific, but we also have some standardized solutions available.

We have two versions, standard and premium, available in different sizes. The only difference between the two versions is that the standard has the magnets exposed to the surrounding environment while the premium has the magnets fully enclosed in stainless steel and ready to function in any environment.

 See figure below: Standard(left) vs premium(right) versions of the Sintex standard coupling programStandardleft vs premiumright versions of the Sintex standard coupling program

Some of the unique characteristics of magnetic couplings

  • Power is transferred without contact – no risk of breakdown
  • Long maintenance-free lifetime
  • No need for lubricant – no friction
  • High power transfer
  • Reduced load on the system
  • Absorption of large eccentricity differences between shafts (greater flexibility in radial and axial placement)
  • High-temperature solutions

Want to learn more?

Download our technical data on magnetic couplings

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