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Magnetic couplings

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CGB Precision Products has released a range of off-the-shelf magnetic couplings from Magnetic Technologies Ltd.

Magnetic couplings offer a non-contact transfer of torque and is available in two configurations, disc and co-axial.

They are typically used in pumps for seal-less applications keeping corrosive, toxic, or flammable liquids from escaping into the atmosphere.

Magnetic couplings are based on a simple concept: opposite poles attract. This attraction is how torque is transmitted from one magnetic hub to another.

By driving one magnetic hub, torque is transmitted magnetically to the other magnetic hub. This can be done through the air or through a non-magnetic containment barrier such as stainless steel or fibreglass, allowing complete isolation of the inner magnetic hub from the outer magnetic hub. There are no contacting parts.

Disc type couplings consist of two opposing discs with powerful rare earth magnets. The torque applied to one disc is transferred through an air gap to the other disc.

The coupling’s simple flat design means it is possible to have angular misalignment of up to 3º or parallel misalignment up to 6mm and still transmit nearly full rotational torque.

It is also possible to fabricate an inexpensive flat barrier to separate the atmospheres or fluids surrounding the two discs. This is CGB Precision Products’ simplest and most versatile coupling.

Advantages of the disc type couplings include:

* No wearing parts

* Synchronous design, no slip at any speed

* No physical contact between driving and driven parts

* Simplifies containment barrier

* Custom designs available.

The coaxial coupling consists of three parts. The outer hub consists of a series of rare earth magnets that are ground, potted and attached to the inside diameter of a steel hub.

The inner hub consists of a series of rare earth magnets that are ground, potted and attached to the outside diameter of a steel rotor.

The inner hub is then completely sealed in stainless steel to protect the magnets and rotor from damage or corrosive substances.

Typically there is a radial air gap of up to .275" (7mm) between the inner and outer hubs. Conventional bores and keyways are used to drive the inner and outer hubs.

Advantages of coaxial type couplings include:

* Eliminates rotating seals

* No wearing parts

* Synchronous design, no slip at any speed

* No physical contact between driving and driven parts

* Custom designs available.

Standard features of the coaxial type couplings include:

* Heavy-duty steel bell housing with large access hole and weep hole

* Increased inner clearance for viscous fluids

* Captured key on motor hub

* Fits most IEC and NEMA motor mounts

* Flow-through inner hub

* Jack screws on bell housing for easy removal.

Magnetic Technologies Ltd also make several magnetic pump drive kits.

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