China Supplier Generator Magnetic Shaft Coupling Magnetic Coupling Sealed Coupling

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Introduction of Magnet Coupling

A permanent magnetic coupling transfers torque from one shaft, 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 Operation

Permanent 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 pumps

Design Considerations of Magnet Coupling

1) Operational environment of coupling

2) Coupling target gap

3) Annual usage demand of coupling

4) Coupling rotational/linear speed(RPM)

5) Required mechanical features, such as mounting hole, shroud, shaft size etc.

6) Fluid viscosity

Magnet Coupling Selection--Technical data of specifying correct coupling

Fluid/Gas

Fluid viscosity (cSt)

Fluid temperature (°C)

Ambient Min. Temp. (°C)

Driver shaft (usually motor side)

Input rating (kW)

Number of poles

Nominal operational speed (RPM)

Torque of motor (Nm)

Type of motor start (direct/soft/by inverter)

Driven shaft (usually pump side)

Type of pump

Dimension of Pump

Pump 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 Coupling

Construction of Magnet Coupling

Components of Magnet Coupling

Magnetic materials – Typically based on thermal and corrosion resistance requirements

Electrically Conductive materials – Typically based on size and cost constraints

Driver and Follower Structure –Typically based on corrosion resistance and cost constraints.

Application with Magnet Coupling

Our magnetic coupling solution only provides STATIC seals.

Application of Magnetic Coupling

Due 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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