AC PROPULSION SYSTEMS: WHAT'S THE WORD?
Over the past years, the evolution of electric vehicles has progressed rapidly. This rapid increase in technology has brought about better propulsion systems, which include the motor, controller, and batteries. There are two basic types of propulsion systems: alternating current (AC) and direct current (DC). The early electric vehicles used DC propulsion systems because they were less expensive and the controllers were considerably less complex. However, these systems do have their drawbacks. They are bigger, heavier, have less power capabilities, and are less efficient at transforming the electrical energy from the battery to mechanical energy at the wheel. AC propulsion systems have many advantages over DC propulsion systems: 1) AC propulsion systems are more efficient at transforming the electrical energy from the batteries to mechanical energy at the wheels; 2) The AC propulsion system has twice the peak power capabilities as a comparable DC propulsion system. This allows much faster accelerations and the higher continuous power rating allows for higher cruising speeds and 3) The AC system weighs about 40% less than the DC system and is proportionally much smaller. This savings in weight translates into increased range and less road wear and the reduced weight translates into less wear and tear on all vehicle components. However, the primary disadvantages of the AC propulsion system in comparison to DC systems are the increased complexity of the controller, and the increased cost of the propulsion system which averages about twice the cost of a DC system, but added investment in an AC propulsion system will pay off in the long run.
Electric Transit Vehicle Institute1617B Wilcox Boulevard
Chattanooga, TN United States 37406
- Publication Date: 1995
- Pagination: 1 p.
- ETVI CURRENT
- Publisher: Electric Transit Vehicle Institute
- TRT Terms: Alternating current; Analysis; Costs; Direct current; Economic efficiency; Electric vehicles; Peak periods; Propulsion; Technology assessment; Transformations (Mathematics); Vehicle power plants; Weight
- Uncontrolled Terms: Cost analysis; Efficiency; Propulsion systems
- Old TRIS Terms: Peak capacities
- Subject Areas: Economics; Energy; Finance; Highways; Operations and Traffic Management; Public Transportation; Vehicles and Equipment; I95: Vehicle Inspection;
- Accession Number: 00713631
- Record Type: Publication
- Files: TRIS
- Created Date: Nov 13 1995 12:00AM