Various structures of generators such as permanent magnet synchronous generators (PMSGs) (Bhuiyan and McDonald 2018; Kumar et al. 2020a, b; Liu et al. 2021), and doubly-fed induction generators (Djilali et al. 2021; Zhu et al. 2018), are the most traditional generators of wind power generation.
A double-rotor AFPM generator for use in wind turbine applications with contra-rotating has been proposed by (Kutt et al. 2020). To verify the analytical calculation of the machine dimensions, the finite element method (FEM) was used. Also, the no-load Back-emf calculation and the electromagnetic torque at nominal current are presented.
Studies show that this optimal axial length is between (0.61–0.65d), where d is the smaller rotor diameter (Irawan and Bramantya 2016; Erturk 2018). Mirnikjoo et al. (2020) have proposed a double-sided flux switching permanent magnet generator with a ferrite magnet for using a wind turbine. In this structure, rotors rotate in opposite directions.
Therefore, the efficiency for different speeds is shown in Fig. 15 and Table 6. In non-slotted structures, due to the large effective airgap length, the efficiency is almost low. However, since this structure has no cogging torque, it is suitable for wind turbine applications.
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This paper is focused on the optimal design, simulation, and experimental testing of a counter-rotating double-rotor axial flux permanent magnet synchronous generator (CRDR …
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A modified WT power curve is defined for v < vcut-in, which supports the permanent WT rotation strategy, allowing flexibility in the …
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