PERMANENT MAGNETIC COUPLINGS MAGNETIC COUPLINGS

an excellence in engineering www.jbj.co.uk/magnetic-couplings.html permanent magnetic couplings built to suit your system. external coupling half, motor side (atmosphere) The rpm of the external half of the coupling is equal to the rpm of the internal half of the coupling. internal coupling half, pump side (uid) containment shroud (does not rotate) Magnetic couplings capable of transmitting torque from 3 to 600 Nm without mechanical contact between two shafts through magnetic forces that are established between the internal and external rotor. The magnetic coupling is ideal for applications where...

Magnetic Couplings Comparison drawings between magnetic couplings and standard Certification Main technical characteristics Certification Available torque for special versions Group zero (GR0) dimensions Group 1 to 3 (GR1, GR2, GR3) dimensions Special features Components and materials Custom designs Operating performance

Use of these magnetic couplings will eliminate uid or gas leakage from system components. Aids compliance with various regulations designed to protect the environment. (See for example the European IPPC Directive 96/61/C) The magnetic couplings are also maintenance free therefore reducing costs. » no uid leakage from pump seals.* (depending on application) » maintenance free. » vibration reduction. » management of misalignment between shafts. » hermetic separation between two areas. » ability to limit a maximum torque.

Magnetic Couplings The GMDO is a permanent magnet coupling designed to transmit torque using the magnetic eld that is established between the inner and outer rotor without mechanical contact between shafts. The use of magnetic coupling is recommended in applications where it is necessary to hermetically separate two zones in order to prevent uid or gas leakage from one area to another. The classic example is uid transfer pump applications. In these applications the uid must not come into contact with the external environment. These magnetic couplings also prevent transmission of vibration and...

Magnetic Couplngs Main components of a permanent magnetic coupling. Magnetic couplings capable of transmitting torque from 3 to 600 Nm, without mechanical contact between two shafts through magnetic forces that are established between the internal and external rotor. The magnetic coupling is ideal for applications where prevention of leakage from the pump is essential. Magnetic couplings also prevent vibrations and, radial and axial loads to the pump shaft. The magnetic coupling is a synchronous system with a primary function of hermetically separating two areas. external coupling half, motor...

Magnetic Couplngs Magnetic coupling layout Port temperature sensor Cooling holes Magnets Electric motor Containment shroud External rotor Internal rotor Magnetic Coupling Selection Drive shaft (usually electric motor side) Input rating (continuous rating S1) (kW) Number of poles (rpm) Electric motor torque (Nm) Type of electric motor start (direct or soft or by inverter) Driven shaft (usually pump side) Type of pump Pump dimension Pump installation position (vertical or horizontal) Pump suction pressure (bar) Additional information Type of uid Fluid viscosity (cSt) Fluid temperature (°C) Benets...

Magnetic Couplngs Comparison Drawings Application without magnetic coupling. This setup will generate uid leakage from the shaft seals. Fluid leakage direction Standard shaft seal layout and usual leakage points (indicated by red arrows)

Magnetic Couplngs Comparison Drawings Application with magnetic coupling. This setup will never generate uid leakage from the shaft seals. DYNAMIC seals = WEAR STATIC seals = NO WEAR Static seals (‘o’-ring) instead of rotary shaft seals

Magnetic Couplngs Adherence to European directives Using these magnetic couplings enables adherence to European directive IPPC 96/61/EC concerning industrial emissions. Also . . .

Magnetic Couplings Main Technical Characteristics Magnetic materials Ne (neodymium) suitable for max temperature : 120C SmCo (samarium-Cobalt) suitable for max temperature : >200 … 300C Coupling Torque (at 20°C): Transfer torque from 3 to 600 Nm (Other values on request) Containment shroud max pressure: Stainless steel version: ≤30 bar Techno-polymer version: ≤10 bar Operational speed: maximum 3600 rpm (Other values on request ) Certication: CE Mark ATEX

Magnetic Couplngs Data Required for Specification Technical data required to specify correct coupling size There is minor power loss using the GMDO magnetic coupling. There are three reason for this; eddy currents, magnetic hysteresis and hydrodynamic resistance. The eddy current and the magnetic hysteresis is only a minimal part of this power absorption. The third consideration, the resistence, depends on the medium used within the pump, and from the moment when the internal rotor is immersed in the medium. Therefore it is important to establish the viscosity of the medium and the operational...

Magnetic Couplngs Available Torque for Special Versions GMDO type : Coupling SIZE n°of magnets ROWS Max torque (Nm) at 20°C SmCo Samarium Cobalt from 0,02 to 3 Nm (Dierent values on request) from 0,01 to 1,5 Nm (Dierent values on request) from 3 to 15 Nm (Dierent values on request) from 1,5 to 11 Nm (Dierent values on request) from 650 to 2000 Nm (Higher values on request) * number of rows of magnets variable depending on nal application. from 500 to 2000 Nm (Higher values on request)

Magnetic Couplngs Group Zero (GR0) Dimensions MAGNETS ROWS TYPE GMDO ELECTRICAL MOTOR Samarium Cobalt (SmCo) Magnets * number of rows of magnets variable depending on nal application.

Magnetic Couplngs TYPE GMDO Samarium Cobalt (SmCo) Magnets QUANTITY SIZE

Magnetic Couplngs Special Features Containment Shroud made of reinforced technopolymer Containment shrouds made of metal have two main problems: » create energy losses » create heat Containment shrouds made of reinforced technopolymer solves these two problems. This cures the energy losses caused by the rotational magnetic field. Furthermore, this solution does not generate any temperature increase even if the containment shroud is empty (dry). This solution is also interchangeable with our stainless steel model. If the reinforced technopolymer containment shroud cannot be used due to pressure...