The Magnetic Couplings are used for non-contact transmission of torque.
Their advantage is that there is no physical connection between the torque transmitting components.
Vibrations on the drive side are dampened. At the same time the Magnetic Couplings represent a simple form of Overload protection for the power drive.
Under Ideal conditions they operate without any mechanical wear whatsoever, and they will enjoy virtually limitless life provided the operating condition and design have been properly selected.
TYPES & FEATURES
All magnetic couplings use the same magnetic properties and basic mechanical forces, there are two types that differ by design.
The two main types include:
- Disc-type couplings featuring two face-to-face disc halves embedded with a series of magnets where torque is transferred across the gap from one disc to the other
- Synchronous-type couplings such as permanent magnet couplings, coaxial couplings and rotor couplings where an internal rotor is nested inside of an external rotor and permanent magnets transfer torque from one rotor to the other
Magnetic Couplings are considered superior to traditional mechanical couplings in several ways.
The lack of contact with moving parts:
- Reduces friction
- Produces less heat
- Makes maximum use of power produced
- Results in less wear and tear
- Produces no noise
- Eliminates the need for lubrication
Additionally because of the enclosed design associated with synchronous magnetic couplings they are manufactured as dust-proof, fluid-proof and rust-proof. The devices are corrosion resistant and engineered to handle extreme operating environments.
Another benefit is a magnetic breakaway feature that establishes compatibility for use in areas with potential impact hazards. In addition, devices using magnetic couplings are more cost-effective than mechanical couplings when located in areas with limited access.
Magnetic couplings are highly efficient and effective for numerous above-ground applications including:
- Chemical engineering
- Medical instruments
- Machine installation
- Food processing
- Rotary machines
Currently, Magnetic Couplings are prized for their effectiveness and used as best alternative for rotary equipment that utilize any type of dynamic sealing viz., Glands/Mechanical Seal.
As the technology improves, magnetic couplings become more prevalent as replacements for variable speed drives in pumps and fan motors. An example of significant industrial use is motors within large wind turbines.