AC propulsion system for an electric vehicle. Phase 1, final report
The object of this program was to develop and test a functional prototype of an ac propulsion system for an over-the-road electric vehicle. It was designed and fabricated from the ground up. The system consists of a two-speed, mechanically-shifted (hydraulic clutches) automatic transaxle, an 18.65 kW (25 hp) rated ac traction induction motor, a pulse-width-modulated (PWM) transistorized inverter, and an overall microprocessor-based vehicle/drive controller. It was shipped to LeRC September 2, 1980, where it will undergo further testing and evaluation on the Road Load Simulator. The system is sized to allow a 1450 kg (3200 lb) GVW vehicle to meet SAE J227a/D cycle and achieve a level road speed of 105 km/h (65 mph). Prototype system weight is 185 kg (407 lb). Design considerations and major developmental problems and solutions are described for each component. Efficiency and performance test results for each system component are given. Technical feasibility is clearly demonstrated in meeting performance requirements. A peak dc-to-mechanical system efficiency of 82% was achieved, and an average efficiency (based on total mechanical output energy/net inverter input energy) over the SAE 227a/D cycle of 79% was deduced from steady-state performance data. Computer models for the inverter, motor and representative vehicle fitted with the system were developed. A preliminary reliability model and failure-modes-criticality analysis are presented. Component and life cycle cost estimates are given.
- Research Organization:
- National Aeronautics and Space Administration, Cleveland, OH (USA). Lewis Research Center; Eaton Corp., Southfield, MI (USA). Engineering and Research Center
- DOE Contract Number:
- AI01-77CS51044
- OSTI ID:
- 5811436
- Report Number(s):
- DOE/NASA/0125-1; NASA-CR-165480; ERC-TR-8101; ON: DE82004690
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
29 ENERGY PLANNING
POLICY AND ECONOMY
ELECTRIC MOTORS
DESIGN
PERFORMANCE
ELECTRIC-POWERED VEHICLES
PROPULSION SYSTEMS
LIFE-CYCLE COST
CONTROL EQUIPMENT
EXPERIMENTAL DATA
FEASIBILITY STUDIES
INVERTERS
MECHANICAL TRANSMISSIONS
PERFORMANCE TESTING
COST
DATA
ELECTRICAL EQUIPMENT
EQUIPMENT
INFORMATION
MACHINE PARTS
MOTORS
NUMERICAL DATA
TESTING
VEHICLES
330300* - Advanced Propulsion Systems- Electric-Powered Systems
290500 - Energy Planning & Policy- Research
Development
Demonstration
& Commercialization