Seite - 107 - in Hybrid Electric Vehicles

• High value of electromagnetic torque for starting ICE (120–300 Nm). • High efficiency at wide speed range (600–6000 rpm). • Reliability at high vibrations and over 250,000 start/stop cycles (during 10 years). • Operation at temperatures between −30 and 130°C. • Easy maintenance and low cost and so on. Usually, the ISAB can be connected with a gasoline or diesel engine, either directly through the crankshaft (see Figure 1) or indirectly through the belt system (see Figure 2); based on that, the systems are called belt-driven starter-alternator-booster (BSAB) and conventional ISAB, respectively. The size of the electrical machine is very important for BSAB application in order to keep the overall size low (the same dimensions like the ones of a conventional alternator) but for a given maximum torque, the systems usually have a recommended gear ratio 3:1 to the ICE crankshaft, according to Ref. [8]. The BSAB runs with a speed three times higher than the ICE. For the ISAB, the speed range is usually synchronized with combustion engine. Figure 1. The ISAB system. Figure 2. The BSAB system. Performance Analysis of an Integrated Starter-Alternator-Booster for Hybrid Electric Vehicles http://dx.doi.org/10.5772/intechopen.68861 107