Edge winding investment to improve fill factor

February 26, 2020 //By Nick Flaherty
Investment in new edge winding equipment by REO in Germany will boost the fill factor of wound components for higher performance.
Investment in new edge winding equipment by REO in Germany will boost the fill factor of wound components for higher performance.

REO UK has invested in several new edge winding machines at its German manufacturing site to reduce the size of its wound components.

The new machines will allow for the development of electrical components such as chokes and transformers that are lighter by up to ten per cent and with reduced power losses of up to 25 per cent compared to existing products.

The edge winding technique produces coils that reduce skin effect and proximity losses compared to traditional coiling techniques. Edge wound coils also boast a lower parasitic capacitance than other methods of winding, which reduces unwanted high frequency return paths to help components ensure electromagnetic compatibility (EMC).

In addition, the single-layered structure of the edgewound coils allows for greater and more efficient dissipation of heat. This is especially helpful in applications that require water-cooling or that are expected to operate under high levels of mechanical and thermal stress, such as leakage transformers in the rail sector or chokes used in electric vehicles (EVs) — two markets that are expected to grow in the coming years.

“Bloomberg has predicted that annual EV sales will hit 10 million over the next five years,” said Steve Hughes, managing director of REO UK. “As this market develops, the components within those vehicles need to develop as well. Electrical components such as chokes are key in this area, and introducing edge winding into our wound components allows them to be even better suited to this application.

“With this investment, we are now able to develop new electrical components that meet the evolving needs of this ever-evolving industry. Not only does the new technique offer REO products greater heat dissipation and lower losses, it also allows us to optimise each product to meet the technical and budgetary requirements of customers. The improved cooling makes it feasible to use aluminium and copper conductors, providing more flexibility in meeting technical demands. The reduced losses and undesirable parasitic elements of an edgewound coil makes it much more suitable for use around silicon carbide (SiC) and gallium nitride (GaN) semiconductors, running at higher frequencies,” he said.

Currently, the winding technique is best suited to products with a current between 50 and 250A. REO is working on new combinations of windings that will allow this to be increased in the future.

www.reo.co.uk


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