Because of high requirements in power, efficiency, installation space and weight, the design of electrical machines for hybrid electrical vehicles is a particular challenge. In order to make an informed decision, several machine types are pre-dimensioned by means of analytical formulae and compared with respect to their power density, efficiency and their applicability in hybrid vehicle concepts. The analytical pre-designs are evaluated by the finite element method (FEM). With regard to a parallel hybrid system with a very restricted installation space, a further study is performed on the permanent magnet excited synchronous machine, preferred for its highest power density and overall efficiency.
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