Dieter Gerling

Driving range evaluation of a multi-phase drive for low voltage high power electric vehicles

This paper introduces an alternative to present state-of-the-art electric traction drives powered by HV batteries: a maximum of 330 kW can be deployed mechanically by a LV multi-phase system. Both the ability to switch the electric machines number of pole pairs and a very efficient 60-phase inverter based on MOSFETs promise a dramatic reduction of losses inside the power train. Investigations on driving cycle efficiencies are carried out for a HV reference system and the novel LV system. The New European Driving Cycle (NEDC) and the driving cycle of the Worldwide harmonized Light vehicles Test Procedures (WLTC) are virtually driven by a common vehicle model in order to determine load profiles for both traction systems. Losses in electric machine, power electronics and battery are estimated and the total vehicles energy consumption is derived. The novel LV traction system promises a great enhancement in driving range compared to the state-of-the-art HV drive.

Highly flexible connection unit for electrical machines with concentrated windings

This paper discusses a highly flexible connection unit for electrical machines with concentrated windings. First, some general restrictions and requirements on connection units are identified. Then a suitable joining technology for the connection unit is investigated. Afterwards, the design of the highly flexible connection unit is introduced and applied to a sample machine.

Analytical comparison of two different redundancy concepts for switched reluctance machines

In this paper two different, fully redundant SRM (switched reluctance machine) topologies are compared: Firstly a 6/4-topology with two identical motors on one axis, and secondly a 12/8-topology, where one 3-phase-system uses every other stator tooth (and the second, redundant, 3-phase-system uses the rest of the stator teeth). The following calculations are performed using analytical formulae to get a fast and clear comparison. The nonlinearity caused by the usual saturation of SRM is covered by a simple correction factor: As the relative comparison of the two redundancy concepts is of interest, this method leads to qualitative and quantitative good results. In addition, a very good starting point for the detailed FEM-refinement of the most promising alternative is generated

Optimization alternatives of mechatronic systems containing switched reluctance drives

In mechatronic systems there are several different kinds of optimization alternatives, in particular mechanic, electronic and control means. In this paper, these different possibilities are investigated and compared for a special example: a switched reluctance drive (SRD), energized from a weak supply net, is coupled to an internal spindle-gear to generate a linear output force. Special attention is paid to cost-effective means of optimization