## 5 Conclusions  
This study has meticulously examined the damping, resonance, and energy generation characteristics of alternators with air, SMC, and iron cores, culminating in quantitative results that provide valuable insights into core material selection for electromechanical applications.  
From a damping standpoint, the air core alternator showcased the highest damping, achieving a remarkable 67% reduction between cycles. Following closely, the SMC core alternator demonstrated a commendable 60% reduction between cycles, underscoring its efficacy in damping vibrations. Comparatively, the iron core alternator exhibited a slightly lower reduction of 59% between cycles, suggesting its ability to mitigate oscillations but to a lesser extent compared to air and SMC cores.  
Resonance frequency analysis unveiled a harmonious resonance frequency of 501.50 Hz shared by both air and SMC core alternators, significantly higher than the iron core alternator at 305.44 Hz. This indicates the suitability of air and SMC cores for high-frequency applications, emphasizing the adaptability and performance of SMC cores in dynamic environments.  
In terms of energy generation, the iron core alternator led with the highest output, evidenced by its peak voltage of 3830 mV and RMS voltage of 1019 mV, catering to applications demanding a high energy output. However, the SMC core alternator displayed promising energy generation capacity, boasting a peak voltage of 1150 mV and RMS voltage of 316 mV, offering an enticing compromise between energy output and efficiency.  
The study highlights the challenge of selecting the right core material for alternators, balancing damping efficiency and energy generation capacity. While air cores and iron cores have their strengths, SMC cores offer a versatile middle ground, minimizing losses while optimizing energy generation and design flexibility.  
In wind turbine alternator design, SMC materials appear as a promising solution for revolutionizing core manufacturing, despite not yet matching iron cores in energy generation. This advancement implies a significant step forward in renewable energy technology.  
The research significantly progresses the development of efficient wind energy technologies, paving the way for optimized bladeless wind turbines. Future improvements in SMC materials hold potential for even greater performance, offering efficient solutions for future wind energy generation.  
Overall, the study emphasizes the unique properties of SMC materials and their role in alternator core manufacturing, laying a strong foundation for further research into enhancing SMC properties through thermal processes.  
Conceptualization, E.G.-G., S.D.P. and S.L.; methodology, E.G.-G., D.J.Y. and A.H.; validation, E.G.-G., D.J.Y., A.H., S.D.P. and S.L.; formal analysis, E.G.-G., D.J.Y. and A.H.; investigation, E.G.-G.; writing--original draft preparation, E.G.-G., D.J.Y. and A.H.; writing--review and editing, S.D.P. and S.L.; supervision, S.D.P. and S.L. All authors have read and agreed to the published version of the manuscript.  
The authors would like to thank the European Union for the funding provided through the European Union's Horizon 2020 research and innovation program under grant agreement No 101021714 (Project LAW-GAME). Views and opinions expressed are those of the authors only and do not necessarily reflect those of the European Union or the European Research Executive Agency. Neither the European Union nor the European Research Executive Agency can be held responsible for them.  
Not applicable.  
Data Availability Statement: Data is contained within the article.  
The authors express their gratitude to Vortex Bladeless S.L. for their technical support.  
Authors [PERSON] and [PERSON] were employed by the company Vortex Bladeless S.L. The remaining authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.