Innovative Motor and Generator Technologies

The goal of this project is to design a motor/generator capable of very high power density and tip speeds. The initial application is a third-generation electricity storage flywheel, currently under development at LaunchPoint. This flywheel uses a hubless design in which the motor drive coils (stator) are located in a stationary center, surrounded by a composite rim that spins at high speed. The moving elements of the motor/generator are mounted on the ID of the spinning rim where they are radially supported by high strength composite material and thus capable of spinning at tip speeds in excess of 800 meters/second — far faster than possible in conventional motors. Power levels of several hundred kilowatts appear feasible in a small (22-inch diameter, 8-inch long) form factor, and the design is scalable to much larger sizes and power levels. This project will evaluate design alternatives, determine precise constraints imposed on the electromagnetics by other components, test critical elements, and produce a design that achieves maximum performance. Other applications include high power generators for direct coupling to turbine engines without the need for reduction gears.