The Vehicle
From 2016 to 2019, Koenigsegg produced the Regera. With a length of 4560 mm and a height of 1110 mm and a total output above 1110 kW, the hybrid sports car accelerated to 400 km/h in 22.87 seconds. Without a classic manual transmission, the Regera is powered by a 5 liter V8, a YASA P400 and two YASA 750 R electric motors, and according to the manufacturer, the Regera had the most power dense high voltage storage.
The Technology
Axial flux motors are designed so that the electromagnetic flux flows parallel to the axis of rotation of the motor instead of radially between the rotor and stator. This results in efficient use of installation space and, due to the leverage effect of the magnets being further away from the axis of rotation, greater torque. It also increases the cooling surface of the copper wire winders, so that cooling can be simplified. By using the 160 kW electric motor with 28.2 kg directly on the crankshaft and two 180 kW electric motors with 37 kg each on the drive axle, yaw control is mapped.
The Lightweighting Effect
The torque increase is about 30 % and at the same time the mass of iron in the stator is reduced by 80 % because the stator yoke is eliminated. Compared with permanently excited synchronous machines with, for example, 150 kW, as in the ID3 from Volkswagen, the weight is approximately halved. However, it should be noted that the axial motors only provide around 60 kW in continuous operation.