Motor drive technologies are used for safety-critical aerospace applications, with a particular focus placed on the choice of machines and their drive topologies.


Aircraft applications demand high reliability, high availability, and high power density while aiming to reduce weight, complexity, fuel consumption, operational costs, and environmental impact. New electric driven systems can meet these requirements and also provide significant technical and economic improvements over conventional mechanical, hydraulic, or pneumatic systems.

As manufacturers work toward the “more electric aircraft,” ePropelled’s motor technology is an ideal way to drive major improvements. Applications such as the starter generator and auxiliary power unit could benefit from the EMG technology. Our patented design allows the use of smaller motors where torque and speed changes are required. These are ideal for aerospace applications where weight reduction is important, as it saves fuel costs and reduces carbon emissions.

We have designed secondary flight control valve actuator motors for various aircraft. We had to increase the safety features on the motor and increase the torque without increasing the overall size of the motor envelope.

We managed to achieve this with great success. The chief design engineer of Moog UK said of us:

We have 45 design engineers in the USA who could not come up with a solution to our problem which you have managed to solve.”


UAV applications range from consumer to commercial to security applications.  Smaller drones rely on electric motors for propulsion while large models use internal combustion engines.  In all cases, cost and performance are critical issues to meet your customer’s applications.

Electric motors will benefit from  the significant performance improvements ePropelled delivers.  Our technology improves motor performance allowing the manufacturer to reduce the cost and weight with smaller battery packs, extending range or a combination of both.

ePropelled’s products address both Range Extender and Starter Generator applications for aerospace. Cooling is a persistent challenge. ePropelled has a patent pending housing design, our Cast Cooling Jacket, that elegantly addresses this problem. Our unique patent pending adaptor allows bearingless mounting of the starter generator directly on to engines.

UAV Starter Generators and Power Managment Units

Designers need to understand the trade-offs in starter generator specifications that will have a major impact on the success of their UAV.  Weight, operating temperature and efficiency have a major influence on performance parameters such as flight duration, payload, operating ceiling and range.  In addition, the starter generator must integrate with other electrical system components.

ePropelled has a range of off the shelf options. Click on the link to download the data sheet:

Contact us to discuss your specific requirements.

All of our starter generators feature:

Best in Class Temperature Range

ePropelled’s patent pending technology enables high continuous operating temperature range (up to 200°C) in its class. This allows UAVs to operate at higher altitude where the air is thinner or where it is in an enclosed environment.

Low Weight 

The Spyder outer rotor series boasts the lowest weight in its class with outstanding power density.

High Efficiency

Lightweight and compact design combines a high power density (2.3kW/kg continuous, 6kW/kg peak) with high efficiency (above 90%).


  • Bearingless option available with dedicated Spyder mounting jig
  • Directly driven on engine crankshaft with customizable shaft coupling ring
  • Optional customizable active air-cooling rotor hub
  • Optional K-type thermal sensor to measure winding temperature

Our series of starter generators can be customized to meet your exact application including low and very high power output options. ePropelled offers a range of electrical system components, such as PMUs, that are engineered to work with these starter generators.