Abstract
In this paper, the cross-coupling phenomenon in the wound-rotor synchronous starter/generator system is studied. Due to the armature reaction, the excitation field is dragged away from the d -axis by the armature magnetic field and the cross-coupling inductance ${L_{dq}}$ exists. What is more, the cross-coupling phenomenon also occurs in the excitation field, it means not only the mutual inductance ${M_{df}}$ between the d -axis and excitation field exists, but also mutual inductance ${M_{qf}}$ between the q -axis and excitation field exists. If this ${M_{qf}}$ component is ignored, this will result in a torque calculated error, especially facing an intense armature reaction, the error can be more than 20%. The mathematical expressions of cross-coupling inductance ${L_{dq}}$ , ${M_{qf}}$ are derived. Based on these expressions, a more accurate torque equation is proposed. The validity of the proposed analysis is proved by showing the agreement with experimental results and maximum torque per ampere (MTPA) loci.
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