Abstract
The constant-frequency double-rotor generator has the potential to be used in the marine energy conversions, such as tides and marine current power generation system due to the advantages. However, there are two different rotational speed movement boundaries in the constant-frequency double-rotor generator, especially the inner moving part boundary between the inner wound rotor and outer permanent magnet rotor. This complicates the finite element analysis and greatly increases the analysis time. In this article, a new finite element analysis method based on double boundaries interpolation multiple reference frame is proposed. The principle of the interpolation multiple reference frame method is introduced, and the analysis and comparison with the traditional method are carried out. The analysis results show that the interpolation multiple reference frame method simplifies the preprocessing procedure, reduces computation time, ensures high calculation accuracy, and has the potential to be applied in all kinds of multiple mechanical port machines.
Highlights
The constant-frequency double-rotor (CFDR) generator is a kind of variable-speed constant-frequency (VSCF) generator, which may be used in the application of ocean energy harvesting.[1]
The CFDR generator outputs a fixed frequency electrical power, so it can be directly integrated with the grid.[2,3]
The CFDR generator has the advantages of no gearbox, high efficiency, and flexible regulation of active and reactive power
Summary
The constant-frequency double-rotor (CFDR) generator is a kind of variable-speed constant-frequency (VSCF) generator, which may be used in the application of ocean energy harvesting.[1]. The moving band method is commonly used in the transient electromagnetic field simulation, which only needs re-meshing the air-gap between the rotor and the stator in every step, so that it can reduce the simulation time, but the re-meshing will produce distorted elements and the distorted element will lead to the calculation accuracy decreasing. The slip surface method is proposed in Yan et al.[16] It does not need to re-mesh and would not change the shape of the element It ensures the calculation accuracy, greatly reduces the simulation time, and it is easy to realize.[17]. In order to analyze calculation accuracy of the IMRF method in the disadvantage conditions, the rotor rotation angle is set not equal to the integer times of node spacing.
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