The research effort presented herein addresses the need to design, fabricate and eventually commercialize a high power density electromechanical battery (EMB) for power-assist hybrid vehicle applications. The completion of this effort, sponsored in 1997 by the US National Science Foundation as part of the 3 l/100 km ((80 mpg) Partnership for a New Generation Vehicle program, has resulted in the following major design features of the EMB: 1. A system with an energy storage of 0.5 kWh (expandable to 1.5 kWh for heavier vehicles), a maximum power output of 88 kWh, a specific energy up to 45 Wh/kg, a specific power of 1.9 kW/kg or higher, a cycle life of over 1 million cycles and a total mass under 45 kg; 2. A self balancing rotor hub design that minimizes the potential for failure and allows the operation of the rotor at the very high speed of 7700 rad/s (45000 rpm) as well as a rotor design comprised of two carbon fiber types and designed to fail in a predictable manner; 3. An ultra high efficient permanent magnet (NdFeB) motor/generator design based on an axial gap configuration with a synchronous rotating back iron and ironless, double sided stator; 4.A totally passive stator cooling configuration based on conductive heat transfer to the outside; and 5. A composite containment housing configuration comprised of a thin steel liner wrapped with kevlar and having energy absorbing characteristics adequate to contain the most likely and essentially only one rotor failure mechanism. A simulation model of the manufacturing process also has been developed in order to improve further the EMB design producibility and identify production process bottlenecks. A cost estimate of the materials and manufacturing of the EMB design has been carried out and indicates a very promising EMB design. The target cost of the EMB system to be developed in later phases of this effort has been set at a realistic range between 3000 USD and 4000 USD per kWh of energy storage.
A self-balancing expansion matched EMB for power-assist hybrid electric vehicles
1998
8 Seiten, 2 Bilder, 4 Tabellen, 12 Quellen
Conference paper
English
elektromechanisches Bauelement , Hybridantrieb , Fahrzeugantrieb , Energiespeicher , Antriebsleistung , Rotor (elektrische Maschine) , Leitrad , Dauermagnet , Simulationsmodell , Herstellkosten , Carbonfaser , Generator (elektrische Maschine) , Gleichgewicht , Umhüllung , Energieaufnahme , Rotor (Maschine) , Materialbruch , Maschinenschaden , Sicherheitseinrichtung
A Self-Balancing Expansion Matched EMB for Power-Assist Hybrid Electric Vehicles
British Library Conference Proceedings | 1998
|Automotive engineering | 1998
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