Electric Drive System
The patented drive system was developed specifically for the Antares and is the soul of LANGE concept.
The brushless external rotor motor EM42 with 42 kW (56.3 hp) is the first electric motor with an approval by the European Aviation Safety Agency EASA. With an efficiency of 90% and a maximum torque of 216 Nm the engine is unique not only in aviation. Along with lightweight and environmentally friendly high-performance batteries, innovative power electronics and a slowly rotating propeller of large diameter it is part of a customized, integrated overall system. A maximum of nine hours of charging and remote control of the charging cycle by SMS enable the availability of Antares on each flight day.
Both specially designed and optimized for the Antares 20E propeller blades are attached directly to the outer rotor of the electric motor and equipped with a propeller diameter of 6.5 feet. The large diameter at a low speed resulting in a high propeller efficiency and a low noise. Since the electric motor of the air density is independent, as height-dependent drive component remains only the propeller. The loss of efficiency of the propeller at 9800 feet just 4% compared to sea level.
The higher the plane flies, the faster the propeller must rotate in to make the power of the motor can. At high altitudes (> 9800 feet) is therefore limited by the maximum speed of the motor, the power available. But even at an altitude of 14,500 feet, the Antares 20E achieved a climb rate of respectable 350 to 400 feet per minute.
This provides the Antares 20E best conditions for the operation of high altitude airfields and mountain flying
A total of 72 individual cells are distributed over 24 battery modules. Pro battery module to 3 individual cells share a monitoring electronics and a battery heating. Each cell has its own voltage and temperature monitoring. In addition, there are redundant both over- and undervoltage monitoring as well as a balancer electronics.
VL41M batteries are used in current European satellites, the military drone RQ-4B Global Hawk, the Joint Strike Fighter, the Airbus 350 and many other high-tech applications.
The battery capacity decreases with increasing number of charging and discharging. The expected battery life is according to the latest findings in more than 4500 SAE cycles. An SAE-cycle stands for fully charging the battery and a discharge at 20% of capacity. Partial discharge or charge corresponds only an equivalent amount of a full cycle. After 4500 this SAE cycles the battery capacity has decreased to 80% of the original level.