KHK & Intis: Inductive Charging Technology for Autonomous Shuttles in Bad Staffelstein

Inductive charging is used in Bad Staffelstein as part of a test track for autonomous shuttles. The technology from Intis Integrated Infrastructure Solutions GmbH enables energy transfer with over 90% efficiency, while fiberglass composite manhole covers from KHK do not interfere with the magnetic field and provide easy access to the underlying technology.

Inductive charging with 11 kW

In Bad Staffelstein, autonomous minibuses—known as people movers—are inductively charged with 11 kW at two endpoints on a 3 km long trial track. The charging system was developed by Intis. Since the manhole covers can be easily lifted from the road, direct access to the inductive charging coil and technology is conveniently possible. The fiberglass composite manhole covers, which can withstand loads of up to 40 tons, are provided by KHK Kunststoffhandel Cromm & Seiter GmbH. The material does not interfere with the magnetic field and is also convenient to use.

Mobility Concept of the Future

In Bad Staffelstein, the joint project Milas (Modular Intelligent Inductive Charging Systems for Autonomous Shuttles) is being implemented from the special funds of the "Energy and Climate Fund" of the Federal Ministry of Economic Affairs from 2021. The fully automated, contactless charging is seen by those responsible as a key approach for future mobility in urban areas. On the test route between Obermain-Therme and the city center, two charging pads have been installed at stops in the roadway. The solution from Intis GmbH wirelessly transfers power to the minibus's battery across a 20 cm air gap.

Non-metallic Covering Solution

Conventional manhole covers made of reinforced concrete, steel, or cast iron are not suitable for inductive charging. These materials interfere with the magnetic field. With manhole covers made of glass fiber composite material, KHK offers a non-metallic alternative. These manhole covers are ideally suited for this application, prevent electrostatic charges, and do not affect the magnetic field during the charging process.

Moreover, the positive material properties of the combination of glass fiber and high-quality epoxy resin are beneficial. As a result, the manhole covers are corrosion-free, weather-resistant, and durable. The cover used is waterproof with an oil and petrol-resistant seal. Additionally, the material does not react with chemicals or aggressive substances such as petrol.

The factor of load capacity also plays a role in selecting the covers. Although the GFRP manhole covers are easy to handle, they also convince with their stability. Weighing only 61 kg, maintenance and inspection work can be carried out effortlessly without much effort. The glass fiber composite manhole covers come in a rectangular design with dimensions of 1.4 x 0.7 m and, due to the material's adaptability, are installed flush with the road surface.