A Generalized Design and Decoupling Analysis Framework of Dual Wound Machines for Marine Electric Power Systems

Modern electric marine vessels require compact and reliable power systems to simultaneously supply propulsion and service loads. Conventional solutions employ separate generators for different loads, leading to increased system volume and weight. Dual wound machines (DWMs) offer a promising alternative by integrating two generators within a single machine frame. However, existing design of DWM relies heavily on iterative harmonic analysis and winding designs, which is time-consuming and lacks general design guidelines. The novelty of this paper is to provide a generalized design methodology of DWM to various slot-pole combinations. Based on airgap field modulation theory, a theoretical framework is established to ensure decoupling performance, covering both rotor and stator winding layouts design. The key factors that govern the intrinsic decoupling capability are analytically identified, enabling direct determination of winding distribution patterns without iterative tuning. Two representative machine prototypes are designed following the proposed methodology, and their decoupling performance is validated through open-circuit and dynamic load experiments.