Konzepte zur Effizienzsteigerung von Traktionsmotoren in batterieelektrischen Fahrzeugen durch den Einsatz neuartiger teillastoptimierbarer Motor- und Invertertopologien

TL;DR

This paper explores innovative motor and inverter designs for battery electric vehicles that reduce harmonic losses, thereby increasing efficiency and driving range without additional costs.

Contribution

It introduces novel part-load-capable motor and inverter topologies that enable loss reduction through motor switching and multilevel operation.

Findings

Harmonic losses can be reduced by novel motor/inverter designs.

Part-load-capable topologies improve efficiency in electric vehicle drive systems.

Cost-neutral loss reduction approaches are categorized and analyzed.

Abstract

To increase the efficiency of future electric vehicles, it is crucial to reduce drivetrain losses in battery-powered vehicles. This enables either an increase in driving range or overall cost savings by reducing battery capacity while maintaining the same range. Harmonic motor losses account for an avoidable share of more than 30% of the total eDrive losses in standard B6-2L 300 kW iPMSM configurations. These losses result from high-frequency voltage distortion across the motor windings, which can be reduced through various approaches. Of great importance is the classification of cost-neutral and low-cost concepts for loss reduction. The following presents and categorizes approaches to loss reduction that have been developed by research and industry in recent years. In particular, novel part-load-capable motor and inverter concepts are introduced, which enable motor switching or multilevel operation to reduce harmonic losses in the part-load range.