Research on Dynamic Characteristics of Electromechanical Coupling for the Ultra‐Compact Wind Turbines

With the development of ultra‐compact wind turbines, the electromechanical coupling dynamic characteristics of integrated gearbox‐generator systems in their drive trains have attracted increasing attention. To reveal these characteristics, an electromechanical coupling dynamic model is established using the lumped parameter method and the magnetic field energy method, incorporating the internal and external excitations of the gearbox as well as the nonlinear electromagnetic excitation of the generator. To achieve efficient and accurate simulation, this paper proposes a Multi‐scale Fast‐Slow Hybrid Solution Method (MFS‐HSM) based on the time‐scale separation strategy. The proposed method effectively alleviates the conflict between computational accuracy and efficiency in multi‐scale dynamic analysis; compared with the traditional single‐step method, the simulation efficiency is improved by 10–15 times, thereby filling the research gap in multi‐scale solution approaches for ultra‐compact wind turbine drive trains. The dynamic characteristics of the rigidly integrated gearbox‐generator system are analyzed in detail. The results demonstrate a strong unidirectional coupling effect: Fluctuations in generator torque significantly affect gear contact stress. Meanwhile, compared with a standalone gearbox system, the rigid electromechanical coupling structure reduces vibration frequency, alters the dominant vibration mode, and increases vibration amplitude—rendering the system more prone to resonance. These findings provide a solid theoretical basis for the structural design and vibration suppression of ultra‐compact wind turbines.