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For drive train efficiency estimation, loss models of the battery, an optional DC/DC converter, an inverter and the electrical machine are presented. Harmonic iron losses of the machine caused by current ripple ar'e considered in order to evaluate various modulation strategies and switching frequencies of the inverter. Battery voltage optimizations are analysed regarding the overall drive train efficiency...
In electric vehicles abrupt torque steps and changing driving speeds require alternating currents and voltages. The battery voltage varies depending on the state of charge and on operation points. In order to keep the DC voltage of the Three-Level Inverter constant or conform it to the induced voltage of the electric machine (M) to reduce switching losses a DCDC converter is necessary. An alternative...
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