Aviation-class Synergistically Cooled Electric-motors with iNtegrated Drives

Release Date:
Project Count:

Program Description:

The ASCEND program supports the development of innovative lightweight and ultra-efficient electric motors, drives, and associated thermal management systems (collectively referred to as the all-electric powertrain) that will help enable net-zero carbon emissions in single-aisle, 150-200 passenger commercial aircraft, such as the Boeing 737. The ASCEND program sets a benchmark of the fully integrated all-electric powertrain system at a power density of ≥ 12 kW/kg with an efficiency at ≥ 93%. Currently, these targets, among others, are beyond the capability of state-of-the-art technologies and will require creative thinking and innovation in the electric motor and power electronics space. The ASCEND performers will work in two phases, delivering the:

Conceptual designs and computer simulations of the motor, its drive, and their integration, as well as subsystem/component level demonstrations for the proposed key enabling technologies to support the performance projections. Phase I will be 18 months long.

Development, fabrication, and testing of an integrated sub-scale all- electric powertrain (≥ 250 kW), including its thermal management system. (Successful projects may proceed to Phase II subject to budgetary restrictions.)

Innovation Need:

Air travel is responsible for a growing portion of U.S. energy usage and associated greenhouse gas (GHG) emissions. In 2017, air travel in the U.S. consumed nearly 3.5 quadrillion BTUs of jet fuel and accounted for about 175 million metric tons of CO2 or about 2.6% of domestic GHG emissions. It is estimated that narrow-body aircraft, such as the Boeing 737, are responsible for nearly half of aviation-related GHG emissions. Consequently, a decarbonized, B737-like aircraft with electrified propulsion would provide the greatest impact on GHG emissions from a single aircraft type. ARPA-E seeks to mitigate the growing environmental burden associated with commercial air travel at minimum economic cost by developing elements of an ultra-high efficient aircraft propulsion system that uses carbon neutral liquid fuels (CNLFs). Current electric powertrains do not have high enough power density and efficiency to enable competitive and fully decarbonized aviation for the narrow-body class of aircraft. It is anticipated that the developed lightweight and high efficiency all-electric powertrains will find direct application in the emerging urban air mobility, unmanned aircraft aerial vehicle, and select regional aircraft markets. These markets are likely to be the first adopters before the technology scales to a single-aisle aircraft.

Potential Impact:

The ASCEND program has the potential to accelerate innovations and cause disruptive changes in the emerging electric aviation field.


The program will further enhance U.S. technology dominance in the field of high-performance electric motors for hybrid electric aviation. Electrified aircraft architectures can increase reliability by increasing redundancy.


An all-electric propulsion system operating on CNLF would have net-zero emissions and be much quieter for passengers and people in the vicinity of airports.


By targeting propulsion system efficiency and specific power improvements, CNLF-powered, zero-net emission aircraft will be capable of a longer range and reduced fuel cost, making them economically more attractive.


Program Director:
Dr. Peter de Bock;Dr. David Tew
Press and General Inquiries Email:

Project Listing

Advanced Magnet Lab - High Power Density Dual Rotor Permanent Magnet Motor with Integrated Cooling and Drive for Aircraft Propulsion
General Electric (GE) Global Research - Electric Flightworthy Lightweight Integrated Thermally-Enhanced powertrain System (eFLITES) for Narrow-body Commercial Aircraft
Honeywell International - Advanced Electric Propulsion System (AEPS)
Hyper Tech Research - Cryo Thermal Management of HIGH-POWER Density Motors and Drives
Marquette University - High Power Density Motor Equipped with Additively Manufactured Windings Integrated with Advanced Cooling and Modular Integrated Power Electronics
Raytheon Technologies Research Center - Superconducting Motor and Cryo-Cooled Inverter Engine: SOARING (P.E00.0399)
Raytheon Technologies Research Center - Ultra-Light, inTegrated, Reliable, Aviation-class, Co-Optimized Motor & Power converter with Advanced Cooling Technology (ULTRA-COMPACT)
Texas A&M University - Multi-Physical Co-Design of Next Generation Axial Motors for Aerospace Applications
University of California, Santa Cruz (UCSC) - Flux-Switching Machine Based All-Electric Power Train for Future Aircraft
Wright Electric - 2nd Generation Motor for Large Electric Aircraft Propulsion Systems