Abstract
This paper introduces a novel electromechanical model for calculating electromagnetic excited structural vibrations and structure borne acoustics for gearless wind turbines. Therefore, the wind turbine model structure is explained and a drivetrain model is derived to investigate the drivetrain decoupled from the aerodynamic excitations. The drivetrain model is fed with results from an electromagnetic finite element model of the generator considering air gap width changes and the wind turbine torque and speed characteristics. Furthermore, an exemplary ramp-up of the drivetrain is simulated. It can be seen, that generator structure oscillations are excited during certain rotational speeds, which may be relevant for the acoustic behavior of the turbine.
Highlights
That the amplitude of the radial force is negative—which means it is directed into the direction of the air gap
In this paper a multiphysical modelling approach for directdrive wind turbines is presented. This model is targeted towards simulating dynamic vibrations and structure-born acoustics of a gearless wind turbine application
The electromagnetic modelling of the generators flux density distribution is explained, which is fundamental for the magnetic forces on the rotor and stator surface
Summary
Power production from renewable resources is a cornerstone of the energy supply of the future [1, 2]. Renewable energy production must become competitive to fossil and nuclear energy sources. One way to achieve this is to keep maintenance costs as low as possible. This paper introduces a multiphysical simulation approach for direct-drive generators, which integrates forces from the electromagnetic finite element solution into. Forsch Ingenieurwes (2021) 85:257–264 a multibody to simulate mechanical vibrations of the structural components of the generator
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