In recent years, magnetic couplings are used in various sectors, where a greater hermetic seal is required to avoid the infiltration of liquid, gaseous, polluting, toxic or aggressive substances.
Range of use: food, pharmaceutical, biotechnology, petrochemical, hydrodynamic, iron and steel, textile, printing, dosing systems, compressors, pumps, mixers …
The characteristics of these products, which use contactless torque transmission, even through bulkheads of different materials, make them reliable, durable and compatible with ATEX environments.
Functioning of magnetic couplings
Simple Concept: Opposite Poles Attract. This attraction is how we transmit torque from one magnetic hub to another. By driving one magnetic hub, torque is transmitted magnetically to the other magnetic hub.
This can be done through the air or through a non-magnetic containment barrier such as stainless steel or fiberglass, allowing complete isolation of the inner magnetic hub from the outer magnetic hub. There are no contacting parts.
Magnetic couplings main benefits
Using magnetic drive systems means eliminating any possible leakage or unwanted contamination of fluids or gases from one environment to another.
The magnetic couplings are maintenance-free and therefore they eliminate the costs due to spare parts or unexpected machine stops; their use also makes it possible not to transmit vibrations and axial and radial loads to use.
- Absence of fluid leakage
- No maintenance
- Vibration reduction
- Tolerance of axial and angular misalignments between shafts
- Hermetic separation between two zones
- Possibility of limiting a maximum torque value (clutch effect)
- Compatible for use up to 140 ° C
- Compatible with ATEX environments
- High coercivity
Favari Trasmissioni, to meet the needs of the market, has included the magnetic couplings of Magnetic Technologies in its sales program.
Disc magnetic couplings
Disc type magnetic couplings consist of two opposing discs with powerful rare earth magnets. The torque applied to one disc is transferred through an air gap to the other disc. Because of its simple flat design, you can have angular misalignment of up to 3º or parallel misalignment up to ¼” and still transmit nearly full rotational torque. You could also fabricate an inexpensive flat barrier to separate the atmospheres or fluids surrounding the two discs. This is our simplest and most versatile coupling.
Typical applications include magnetic mixers and magnetic drive pumps.
Co-Axial magnetic couplings
The co-axial coupling consists of three parts, the inner hub, the outer hub, and the optional containment barrier. Both the inner and outer hubs consist of a series of rare earth magnets that are ground, potted, and glued to steel hubs. The inner hub is then completely sealed in stainless steel to protect the magnets and hub from damage or corrosive substances.
These couplings are ideal for applications such as magnetic mixers, in which the “driven” hub is physically separated and sealed from the “driver” hub. Magnetic mixers are particularly well suited to applications that involve highly toxic or corrosive chemicals.
