MA – Analysis of the torque generated in an integrated DC boost charging circuit for an eAxle

The growing adoption of electric vehicles (EVs) has driven the need for efficient charging and power transfer solutions. Integrated DC boost charging circuits in eAxle systems provide a compact approach for boosting voltage from a 400 V charging station to an 800 V battery. This topology uses the star point of a Permanent Magnet Synchronous Machine (PMSM) as the input, stator windings as inductors, and the inverter as a switching device.

This thesis focuses on analyzing the torque behavior in the PMSM airgap under varying rotor angles, zero-sequence current amplitudes, operating modes (2-phase or 3-phase) and PWM switching frequency.

The aim is a comprehensive understanding of how zero-sequence current generates parasitic torque in PMSMs. This should be based on an analytical model to estimate torque as a function of rotor angle, zero-sequence current, and mode of operation. The analytical model will be validated using FEM simulations and experimental measurements. At the end there should be suggestions on an optimized operation strategy to minimize parasitic torque generation.

Bearbeiter: Rehan Javed Khokhar

Betreuer: Aravind RAMESH-CHANDRAN 

Verantwortlicher: Prof. Dr.-Ing. Martin März