Advancing Rotorcraft Design Through Innovative Electric Motor and Thermal Management Technologies

Electrification and hybridization are reshaping rotorcraft design possibilities, particularly in the realm of Electric Vertical Takeoff and Landing (eVTOL) aircraft, where the U.S. Army continues to expand its research efforts. However, current electric motor technologies present significant constraints, primarily due to their weight and operational characteristics. High-power output motors typically operate at high rotational speeds exceeding 2,000 RPM, necessitating either multiple motors or mechanical transmissions to achieve the desired torque and efficiency. Direct drive, while promising for its potential weight efficiency and reliability benefits, remains impractical with current technological limitations.LaunchPoint proposes an innovative solution to these challenges with a focus on scaling our novel electric motor, and working with thermal systems subcontractor, Intergalactic, to develop a motor system specifically designed for direct-drive rotorcraft. The envisioned motor targets hover-efficient, low-disk loading platforms, requiring capabilities of 400-700+ horsepower at low rotational speeds of 250-400 RPM, resulting in torque outputs ranging from 5,000 to 15,000+ foot-pounds. Crucially, these motors are expected to achieve torque densities of 20-30+ foot-pounds per pound, ensuring they meet stringent weight efficiency requirements critical for aerospace applications.A key emphasis of this development is advanced thermal management, addressing the critical need for efficient cooling in high-power density applications. To achieve this, LaunchPoint EPS has selected Intergalactic as its thermal systems provider. Intergalactic's state-of-the-art microtube heat exchangers, known for their ultra-lightweight, curved, and conformal designs, will be integrated into the motor architecture. These heat exchangers significantly enhance cooling performance through increased surface area and low resistance, essential for maintaining motor reliability and efficiency under varying operational conditions.The proposed Small Business Innovation Research (SBIR) effort by LaunchPoint is structured to progress through rigorous phases. Phase I will commence with a comprehensive analytical study, elucidating the underlying physics and scalability considerations of the proposed motor architecture. This phase will also focus on addressing critical challenges such as thermal management to ensure operational reliability under varying conditions. Phase II will advance to detailed motor design tailored for a specific rotorcraft use case, integrating findings from Phase I to optimize performance metrics. The culmination of Phase II will involve the construction and demonstration of a prototype motor, validating its performance in lab conditions. This iterative approach not only ensures the technical feasibility and scalability of the motor but also positions LaunchPoint at the forefront of electric motor innovation for direct-drive rotorcraft applications