This study presents a detailed analysis of the design of SRM for a car starter-alternator system integrated to the flywheel. This analysis is based upon a comparison of four structures of machines and proves that a 24/16 SRM is the most interesting. In this case, the saturation level is less important and the energy conversion is improved. In addition, the current constraints in the DC bus (battery) will be limited. This choice implies a high electric frequency and thus leads to produce high iron losses. However, from 1,000 rpm, the machine is used as alternator, and it is supplied with a voltage control. So the iron losses can decrease when the speed increases. A model analysis of stator with different pole number proves that the fundamental mode (of rank Ns/3) has a high natural frequency on one hand, and on another hand will be excited with harmonic magnetic forces of high order. In consequence, vibrations of magnetic origin can be reduced. An investigation of the alternator operating of the tested machine, rated at 5 kW, is working in progress.
SRM design for starter-alternator system
Entwurf eines SRM für ein Anlasser-Lichtmaschine-System
2000
5 Seiten, 15 Bilder, 2 Tabellen, 8 Quellen
Aufsatz (Konferenz)
Englisch
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