What is a Magnetic Coupling Used For?

 Magnetic shaft coupling provides non-contact torque transfer. They're commonly employed in sealless operations like magnetic drive pumps and magnetic mixers to prevent corrosive, poisonous, or combustible liquids from leaking into the environment.

Magnetic drive pumps have no touching elements that allow torque transmission via angular and parallel misalignment. By driving one magnetic hub, torque is imparted magnetically to the other magnetic hub. This can be accomplished using air or a non-magnetic containment boundary such as stainless steel or fibreglass, which completely separates the internal magnetic hub from the outside magnetic hub.



What is the mechanism of magnetic shaft couplings?

The linked magnets are mounted to two concentric rings on the pump housing on either side of the containment shell.

Each ring has the same number of matched and opposing magnets, which are positioned around the ring with alternating poles. The outer ring is connected to the motor's drive shaft, while the inner ring is connected to the pump shaft.

Applications

Magnetic coupling is used by some diver propulsion vehicles and remotely driven underwater vehicles to transfer torque from the electric motor to the prop. Magnetic gearing is being investigated for use in utility-scale wind turbines to improve dependability. Compared to a standard stuffing box, the magnetic coupling has various advantages. The magnetic shaft coupling is used between the motor on the dry side of an aquarium wall and the propeller/impeller in the water on the other side of the aquarium wall in some aquarium pumps.

There are two choices for constructing the magnetic pattern on each disc with two face-to-face magnetised discs — one driving magnet on the dry side and another driven magnet on the moist side of the glass. One alternative is equalising the (attractive) torque-transfer section with magnetic repulsion near the axis, effectively cancelling the axial load. The alternative option employs a mechanical thrust bearing to oppose the attraction between the magnetised discs and optimises the magnetic pattern to maximise torque.

Another example of magnetic coupling is a magnetic stirrer.

Magnetic connections are cooled in what way?

Heat is generated inside the pump due to magnetic losses in the containment shell. A specific flow of pumped fluid through the gap between the inner magnets and containment shell is required to disperse this heat (and eliminate the risk of flashing (fluid vaporisation). This can be accomplished in a variety of ways:

  • Circulation from the pump discharge to the pumping element via the inner magnets.

  • The pump can be kept at a lower temperature by wearing an outer garment.

  • A cooling fluid can be applied directly to a double-layered containment shell. This is perfect

  • for applications that require accurate and consistent temperature control.

Sensors can also be utilised to detect the first signs of overheating in the containment shell, allowing for assessing and modifying the situation. The motor's power monitors can also identify a low-load state, such as dry-running, leading to overheating.

Final Thoughts

Magnetic drives provide the key benefit of pumped media confinement and zero leakage. Compact design is possible because of rare earth alloy magnets with strong field strength.

Amar Equipments has magnetic drives for high vacuum distillation in India's round bottom flasks (RBF). When the vacuum is lost during distillation utilising traditional PTFE bush/tape, the product is contaminated. This can be completely avoided by using zero leakage magnetic drives/mixers with adequate taper/glass joints, such as B24, B34, B/NS29/32, B/NS45/40, etc. These magnetic drives are cost-effective and ensure a high-quality product with no contamination.

Clients can purchase Amar Equipments MG series drives, which can be configured to work with their existing stirrers. Their existing RBF applications can also use the MMG series tiny inline vibration-free motor and coupler.


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