An Efficiency-Optimized Control Strategy for Variable Flux Machines
Year: 2026
Type: conference-paper
Abstract: Variable flux machines enable online adjustment of the permanent magnet flux linkage, introducing an additional degree of freedom for efficiency-oriented control. This capability requires a coordinated treatment of operational efficiency and the energetic cost of MS manipulation.A state-based control structure is proposed that switches between standard operation and an efficiency optimizing decision mode. MS adjustments are executed through online-generated current trajectories that maintain torque while respecting voltage constraints. The decision logic relies on an amortization-time criterion: an MS change is only carried out if its energetic benefit is expected to outweigh the associated manipulation losses within a predefined horizon.The proposed control strategy was evaluated on a WLTP driving segment, demonstrating that the method consistently selects locally advantageous MS levels and yields measurable efficiency improvements without compromising torque control.
Institution: Karlsruhe Institute of Technology
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
OpenAlex ID: W7225192275