EE TECH TEAM ROADMAP
April 14, 2004
ADVANCED POWER ELECTRONICS AND ELECTRIC
Achieving the FreedomCar goals will require the development of new technologies for power electronics
and electric machinery. The new technologies must be compatible with high-volume manufacturing; must
ensure high reliability, efficiency, and ruggedness; and simultaneously reduce cost, weight, and volume.
Key components for fuel cell and hybrid-electric vehicles1 include motors, inverters/converters, sensors,
control systems, and other interface electronics.
Power Electronics – To develop automotive integrated modular power modules for power
conversion and control. Building blocks to be developed include power switch stages optimized
to run newly developed motors, drives, DC/DC converters, advanced controllers and sensors.
Electric Motor Drives – To develop advanced motor technologies utilizing high-performance, low-
cost materials and incorporating advanced thermal-management technologies that will yield high
power density and cost-effective motors for high-production-volume series and parallel hybrid
Advanced Integrated Systems – To integrate motor and power-control technologies, focusing on
cost and weight reduction and performance enhancement. Develop advanced integrated thermal-
management systems, state-of-the-art models, and new techniques for high-volume manufacturing.
2. Technical Targets
The FreedomCAR goals and technical targets for 2010 for the electric-propulsion system, as given in Table
1, include the motor, inverter, gearbox, and controller.
Table 1. Goals for Electric Propulsion System for 2010
55 kW for 18 seconds
>15 years (150,000 miles)
Specific power at peak load
>1.2 kW/kg [<46 kg]a
Volumetric power density
>3.5 kW/l [<16 l]a