Two electric motors with the associated inverters are used as the drive unit in the BALIS project, which convert the electrical power provided by the fuel cell system and/or battery system into mechanical power. As all components are operated on the ground, it does not make sense to utilise the mechanical power in the form of propulsion power from an aircraft in this project. The mechanical power is therefore converted back into electrical power via a load machine and either fed back into the grid or released into the environment in the form of heat. The drive must be as powerful and compact as possible and be able to follow the dynamic behaviour of the fuel cell system. In addition, the drive must be able to handle the high voltages and currents, which poses challenges in terms of insulation, contacting and thermal management. In addition to the electrical input power and the mechanical power output of the drive unit, the precise measuring equipment in the test field also records the temperatures and vibrations of the system.
