Automotive Electronics

Wireless Power and Inductors from Magnetizable Concrete

Magment GmbH has introduced a composite material based on a special cement matrix loaded with magnetizable particles having a suitable size distribution. These material grades can reach initial permeabilities up to 60, which opens up a very broad range of electromagnetic applications. A primary advantage is full integrability into any cement-based structure maintaining a high degree of robustness. Also, cement as a binder allows the production of rigid and mechanically rugged inductive components with high stability to environmental influences.

Magment concretes enhance the inductive coupling by directing the magnetic field towards the receivers and maximizing the transferred energy such as to electric vehicles. To increase the energy transfer efficiency and/or the distance between the transmitter (road) and receiver (vehicle) coils, it is indispensable to use magnetizable materials to focus the magnetic field between the coils.

Using conventional materials such as ferrites is too costly and difficult to integrate. Moreover, the brittle ceramic behavior as well as high sensitivity to pressure (magnetostriction) are additional hurdles for its implementation. Using Magment concretes instead and by use of conventional parking lot or road construction techniques both the implementation and the performance regarding magnetic field focusing is simplified and high-efficiency wireless charging of electric vehicles can be implemented.

Magment power inductors and transformers are based on a disruptive technology for both a novel material and an innovative magnetic design. The material is a concrete with magnetizable grains embedded in a cement matrix in a pressureless process. Its features are high dc-bias capability and low losses as well as very high linearity, thermal conductivity and mechanical robustness. This allows users to design rugged inductive components with a distributed air gap for minimized eddy current losses by completely surrounding the coil by the Magment material.

This ensures a complete magnetic filling of the available volume within the aluminum housing yielding maximum performance and cooling. As compared to the conventional manufacturing of winding cores and sealing with a potting material, the Magment "wind and magnetic pour" process goes along with full shape and size flexibility, no tooling required.

This composite material is based on a special cement matrix loaded with magnetizable particles having a suitable size distribution. These material grades can reach initial permeabilities up to 60, which opens up a very broad range of electromagnetic applications. A major advantage is the ability to fully-integrate into any cement-based structure maintaining a high degree of robustness. Also, cement as a binder results in rigid and mechanically rugged inductive components with high stability to environmental influences. MC material grades feature a prolonged lifetime.

Magment enables both the customization of components to any given space constraints and the minimization of total material cost by a special magnetic design algorithm yielding lowest price as compared to conventional inductors. All component manufacturing process steps are under one roof ensuring quickest turnaround time from design-in to shipping.

Magment GmbH
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