Sealed Coupling
Introduction of Magnet CouplingA permanent magnetic coupling transfers torque from one shaft,Website:, but using magnetic force rather than a physical mechanical connection. Major parts of a coupling are follower and driver. The driver is connected to a motor, when follower reacts to the driver's motion, this results in the transmission of mechanical energy without contact.GME coupling can transmit torque from 0.15 to 1000 Nm between two shafts through magnetic forces without mechanical contact. The couplings are often used to eliminate any possible fluid leakage from the pump forever and without maintenance. They can be designed to suit different machinery without altering system.Theory of Magnet Coupling OperationPermanent magnetic coupling is to transmit torque through magnetic field that is established between the inner and outer rotor. The coupling is used where it is necessary to hermetically separated two zones in order to prevent fluid or gas leakage from an area to another, such as fluid transfer pumps applications. And the coupling also prevents transmitting vibration and axial and radial loads on the drive shaft.The eddy currents , magnetic hysteresis and hydrodynamic resistance directly affect the overall efficiency of the magnetic coupling. The magnetic coupling works by using the power generated by permanent magnets, not electro magnets, so no external power is needed. Permanent magnets are installed alternating between poles in a side by side and opposing position. The magnets support of ferromagnetic material is to help the channeling of the magnetic field correctly and thus maximizing the transmittable torque.Advantages of Magnet Coupling-Elimination of fluid leakage from the pump shaft.-Vibrations are not transmitted to the pump.-Increased safety and energy savings and no maintenance required for coupling.-Standard pumps without expensive mechanical seals are allowed to use.-No additional cost for purchasing mechanical seal spare parts and maintenance.-Couplings can be customized to suit different machinery.Features of Magnet Coupling-Long life and low maintenance costs-Very high efficiency and hermetically sealed-No contact of torque transmitting elements with permanent magnets-Hermetic separation of the driving and driven side-Torque from 0.15 to 1,000 Nm and torque Overload protection-Eliminates the need for dynamic shaft seals-Tolerate shaft misalignments-Sliding bearing optional-Frequently used in vacuum and fluid pumpsDesign Considerations of Magnet Coupling1) Operational environment of coupling2) Coupling target gap3) Annual usage demand of coupling4) Coupling rotational/linear speed(RPM)5) Required mechanical features, such as mounting hole, shroud, shaft size etc.6) Fluid viscosityMagnet Coupling Selection--Technical data of specifying correct couplingFluid/GasFluid viscosity (cSt)Fluid temperature (°C)Ambient Min. Temp. (°C)Driver shaft (usually motor side)Input rating (kW)Number of polesNominal operational speed (RPM)Torque of motor (Nm)Type of motor start (direct/soft/by inverter)Driven shaft (usually pump side)Type of pumpDimension of PumpPump installation position (vertical/horizontal)Pump suction pressure (Bar)Max. pressure inlet port pump (Bar)Max. pressure outlet port pump (Bar)Max. displacement at max. pressure and min. variable stroke (cm³/rev)Dimensions of Magnet CouplingConstruction of Magnet CouplingNo.DescriptionMaterial1Separator looking ringaluminum 60822Bell housingaluminum 60823Containment shroud ( separator )AISI 304 or TECHNOPOLYMER4Electric motor side flangealuminum 60825Pump side flangealuminum 60826O ringViton or PTFE7O ringViton or PTFE8Electric motor hubaluminum 60829pump hubaluminum 608210Internal rotorFe52011External rotorFe520Components of Magnet CouplingMagnetic materials – Typically based on thermal and corrosion resistance requirementsNdFeB Magnet· Temperatures up to 150°C· Corrosion protection requiredSmCo Magnet· Temperatures up to 350°C· Corrosion protection optionalFerrite/Ceramic Magnet· Temperatures up to 250°C· Corrosion protection not requiredElectrically Conductive materials – Typically based on size and cost constraintsAluminum· Low cost· Moderate-High conductivityCopper· Moderate cost· High conductivityDriver and Follower Structure –Typically based on corrosion resistance and cost constraints.Non-Magnetic Stainless Steels (316, 304, etc.)· Moderate cost· Corrosion protection not required· Typically used for hermetic sealed units· Low strengthApplication with Magnet CouplingOur magnetic coupling solution only provides STATIC seals.Application of Magnetic CouplingDue to its advantages, GME magnetic coupling is widely used in various fields, such as Biotechnology, Petrochemistry, Subsea Equipment, Pharmaceutical Industry, Chemical Industry, food Industry, Electrical Generators, water management etc.
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