Magnets reduce eddy current losses in high-efficiency motors

Arnold Magnetic Technologies Corporation offers L-Type Laminated magnets for high-efficiency industrial applications such as high-speed power generation, high-speed magnetic bearings, high-speed motors, and more. 

In utilising L-Type magnets for motors, having more power does not need to mean more heat production. Arnold reduces eddy current losses to ensure efficiency. 

Utilising the thinnest insulating materials available in the market, layers measure fewer than 20 micromoles. These permanent L-Type magnets have guaranteed performance quality at temperatures of 200ºC+ and are available in either Samarium Cobalt or Neodymium Iron Boron. In determining whether to use Samarium Cobalt or Neodymium Iron Boron, it is important to consider the highest temperature potential for the application, what the required magnetic output is at the typical use temperature for the application, and the total target cost. 

Arnold’s RECOMA 35E is the most power-dense samarium cobalt magnet on the market. It has been designed for use in the most demanding applications, from usage high speed (100,000 RPM+) to high temperature (above 200°C) and corrosive environments. These qualities make Arnold’s Samarium Cobalt L-Type magnets ideal for industrial market applications. Plus, Arnold has registered every location throughout the RECOMA supply chain with ITAR and ensured this product can adhere to DFAR clauses. 

Looking at L-Type magnets, with and without lamination, Arnold has calculated the difference of eddy current losses and resulting heat distribution throughout the magnets. The graphic to the left shows the heat differential in L-Type magnets without lamination—the red and yellow areas indicate high heat—and Arnold’s Laminated L-Type magnet below. In combination with cutting-edge magnet materials, Arnold’s lamination ensures heat reduction and higher efficiency by reducing eddy current loss.

All Arnold permanent magnets, including the L-Type Laminated magnets, are custom-made to clients’ specifications and project needs. Arnold’s engineers can help to select an appropriate material and lamination thickness to perform optimally in each application, given temperature and frequency requirements. 

Arnold collaborates with clients on high-efficiency motor designs using laminated Rare Earth magnets, precision thin metals, carbon fibre sleeving, and RECOMA samarium cobalt for total system performance. With a worldwide presence and extensive engineering expertise, Arnold can work with any design team to improve motor performance, deliver custom magnetic assemblies, and even complete rotors.