The combination of AMK's design concept with four stator assemblies made from VACODUR 49 produces a motor capable of impressive performance. Weighing in at a mere 8 kg, yet with a maximum output of 54 kW, it produces an increase in power of 32 percent over the standard electrical steel model (see Figure 3
). The motors conform to the specific conditions imposed by the competition rules with respect to the vehicle design and power output limits. In racing cars, maximum power output takes second place to torque, which is a key defining factor of the vehicle's dynamic potential. With a maximum torque of 51 Nm, the motor delivered an improvement of 53 percent over its electrical steel counterpart. This high torque and low weight form the basis for the car's optimum acceleration. Unlike combustion engines, electric motors can deliver torque from a standing start – the main reason for the clear superiority of electric-drive vehicles in drag races in recent years. From 10,000 rpm upwards, the motor electronics cap the torque and any further power output. However, this is not a hindrance in the race, the rules of which specify a maximum power output of 85 kW.
Figure 3: Maximum torque and maximum power output of AMK's DT5-26-10-POW synchronous motor using stator assembles of VACODUR 49 compared to M270-50A electrical steel.
The partnership of Vacuumschmelze and AMK is supporting three teams in this year's Formula Student Electric: the University of Stuttgart (GreenTeam), Delft University of Technology (DUT Racing) and Leibniz University, Hanover (HorsePower). The Stuttgart and Hanover teams both have two motors on the rear axle, while Delft University of Technology has implemented a half-length version of the AMK concept into an all-wheel-drive design.
This year, team races have been held at Silverstone in the UK, Spielberg in Austria, Hockenheim in Germany and Barcelona in Spain. The peak performances and innovations made possible by the new alloy from Vacuumschmelze and AMK's technical expertise are bound to drive one or other of the teams to the top. This is confirmed with the latest overall standings of two of the teams sponsored by Vacuumschmelze and AMK who have reached the top spots, with Delft University in 1st place and Stuttgart University in 3rd place. Zurich University, who are independently sponsored by Vacuumschmelze, achieved 2nd place in the standings.
Overview of the new E0711-3
Total power output 102 KW (139 hp)
Acceleration to 100 km/h:
Number of cells:
2 permanently excited water-cooled synchronous motors
Maximum power output:
each 54 kWh, efficiency: 95%
Custom power electronics, torque vectoring
Hybrid monocoque (CFRP + tubular grid)
2-speed spur gears
13" rims with aluminium star
About the author:
Robert Brand was born in 1966 in Aschaffenburg/Germany. He is head of business development in the business unit "Materials & Parts" of Vacuumschmelze GmbH & Co. KG. R. Brand has a PhD in physics and started his work history in research and development of soft magnetic materials.
Education as a physicist at the Technical University Darmstadt, Germany. Ph.D. degree in the field of disorder dynamics of plastic crystals at the University of Augsburg, Germany
Courtesy of EETimes Europe
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Cooling EV batteries
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