Dynamic Current Reference Determination of Electrically Excited Synchronous Machines Based on Torque Gradients of Copper Losses
Journal article, 2024

Electrically excited synchronous machines (EESMs) have become an attractive solution to electric vehicles. The excitation of the machine can be regulated by adjusting field current. This introduces one additional degree of control freedom. The control of armature current in stator and field current in rotor is expected to not only reduce the total losses, but also dynamically redistribute the load on both windings so that neither of them overheats. To realize this function, an algorithm is proposed in this study to dynamically determine the current references in EESM torque control. A cost function is introduced by placing weights on stator and rotor copper losses separately. The weights can be adjusted dynamically. The cost function is minimized by moving the current reference vector. The moving of the vector is orthogonally decomposed into a torque-related component and a cost-related component. When current or voltage limits are reached, a cancellation technique is activated to constrain the reference vector. It is shown in experimental results that expected performance is achieved in all operating conditions.

electrically excited synchronous machine

torque control

current reference determination

Author

Junfei Tang

Chalmers, Electrical Engineering, Electric Power Engineering

Bowen Jiang

Chalmers, Electrical Engineering, Electric Power Engineering

Hao Chen

Chalmers, Electrical Engineering, Electric Power Engineering

Yujing Liu

Chalmers, Electrical Engineering, Electric Power Engineering

Stefan Lundberg

Chalmers, Electrical Engineering, Electric Power Engineering

IEEE Transactions on Power Electronics

0885-8993 (ISSN) 19410107 (eISSN)

Vol. 39 6 7423-7433

Power electronics optimisation for next generation electric vehicle components (PowerDrive)

European Commission (EC) (101056857-PowerDrive), 2022-05-01 -- 2025-10-31.

Subject Categories

Control Engineering

Other Electrical Engineering, Electronic Engineering, Information Engineering

DOI

10.1109/TPEL.2024.3377470

More information

Latest update

5/11/2024