A wandering field

A wandering field

Bremen, 13. May 2015 – anyone who has hallucinations should see a doctor. Those who have visions, however, should test them for feasibility. This is the role played by scientists at the fraunhofer institute for manufacturing technology and applied materials research (ifam) in bremen: under the direction of professor matthias busse, they have removed the internal combustion engine from a rare artega, installed two 156-kilowatt electric motors near the wheels instead, and screwed an 80-centimeter-wide and two-meter-long charging plate ("pickup") underneath the car. This will enable the frecco i sports car to charge up without contact – not while stationary, but while driving.

Before we answer the question of why this is useful at all, let’s first look at the vehicle itself. The frecco i stores its electrical energy in a 37.6-kilowatt-hour battery from akasol. In this test, the charging power was not designed for the maximum conceivable, but rather for what is reasonable: 30 kilowatts are enough to bring a plus into the battery under most conditions. At 130 km. Oh yes, and if required, the ex-artega, which weighs around 1.5 tons, can also be charged with a cable and 3.3 kilowatts of power.

Amazingly high efficiency

Construction company max bogl helped build the 25-meter test track at intis gmbh (lathen, emsland). The aim is to demonstrate the practicality of all components, i.E. Their compatibility with conventional trench construction. The primary coil, which induces current in the car driving over it via a magnetic field, was embedded at a depth of about ten centimeters and a width of one meter. A frequency of 35 kilohertz is used for this purpose. The efficiency is high and – measured from the feed into the coil to the battery and thus including various conversions – is around 90 percent.

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