Energy harvesting -  Micro-kinetic Generator - Modeling, Energy Conversion,
Optimization and Design Considerations

https://www.researchgate.net/publication/224142807_Micro-kinetic_Generator_=
Modeling_Energy_Conversion_Optimization_and_Design_Considerations


This article focuses on a micro-kinetic generator, which is used in
Autoquartz watches designed by the Swiss manufacturer ETA (part of the
Swatch Group). This original electromechanical system, incorporating an
intermediate energy storage located in a spring, is based on harnessing the
energy from movement. We have built an electromechanical model using the
Matlab Simulink application and proceeded with its experimental validation
on various movement profiles. Our research has highlighted the existence of
an optimal transfer of energy (obtained by either influencing generator
design or regulating output voltage of the active rectifier connected to
the generator) that helps maximize energy recovery. Finally, this paper
presents the results of a system resizing study for the purpose of studying
potential system productivity at other scales, and highlights the existence
of an optimal set of parameters maximizing energy recovery.

+ some interesting references.
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Someone interested therein:

https://electronics.stackexchange.com/questions/464806/simulation-of-the-mi=
cro-kinetic-generator
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