High efficiency demands the best materials, and the Arnold L Type laminated rare earth magnets are proven to reduce eddy current losses in high efficiency motors. Fewer eddy current losses means lower heat and greater efficiency. Designers in the aerospace, automotive, motorsport, and industrial markets are turning to laminated rare earth magnets, and are working to balance the trade-off between power and heat. Arnold minimises the trade-off by offering best-in-class materials with:

  • The thinnest available insulating layers, <20 um
  • Performance at temperatures up to 200˚C
  • Magnet layers from .5 mm and up in custom shapes and sizes in neodymium iron boron or samarium cobalt

With a worldwide presence and extensive engineering expertise, Arnold can work with your design team to improve motor performance, delivering custom magnetic assemblies and even complete rotors. L Type magnets provide record-breaking performance under extreme conditions — from motorsports to aerospace. We collaborate on high efficiency motor designs using laminated rare earth magnets, precision thin metals, carbon fibre sleeving, and RECOMA samarium cobalt for total system performance. Made to your specification and project requirement, the L Type rare earth magnets are manufactured with Arnold’s proprietary processes for the thinnest layers and highest performance.

Modelling with L Type Magnets

Calculation of eddy current losses with and without lamination are shown below. Our engineers can help to select an appropriate material and lamination thickness to perform optimally in your application, given your temperature and frequency requirements.


Without Lamination


With Lamination

Achieve Optimum Performance

The optimal lamination for your application is a balance of the need for the greatest electrical resistance at the operating frequency and the best magnetic performance in the physical envelope of your application. Matching the right L Type insulation and magnet layer thickness to your application makes all the difference.

l - mm

.5mm L20
96% magnet fill fraction

l - mm

1mm L20
98% magnet fill fraction

l - mm

1mm L40
96% magnet fill fraction

What size laminate do you need?

Validated by an independent, outside laboratory, 1mm L Type RECOMA 33E separated by 18 micron polymer lamination, the thinnest available, offers both optimal magnetic performance and lowest resistance for high efficiency motor applications.


Read more about L-Type Magnets

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