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A three-phase AC generator has a rotor with a rotating magnet placed within the stator mounted with the stationary three-phase winding to generate three-phase voltages via mutual induction. These windings are evenly distributed around the inner circumference of the stator and are arranged 120 electrical degrees apart. Three-phase stator windings consist of three separate coils or groups of coils, known as phases, each connected in Y (star) configuration or Delta configuration.
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Multistage coupling water-enabled electric generator with customizable energy output.

Puying Li1, Yajie Hu1, Wenya He1

  • 1Laboratory of Flexible Electronics Technology, Key Laboratory of Organic Optoelectronics & Molecular Engineering, Ministry of Education, Department of Chemistry, State Key Laboratory of Tribology in Advanced Equipment (SKLT), Tsinghua University, Beijing, 100084, P. R. China.

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This study introduces a multistage coupling water-enabled electric generator (mc-WEG) that harvests energy from both liquid water flow and moisture. This innovative device maximizes energy capture, reducing waste and powering electronics efficiently.

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Area of Science:

  • Energy Harvesting
  • Sustainable Energy Technologies
  • Materials Science

Background:

  • Water circulation represents a vast, untapped sustainable energy source.
  • Current single-stage water-enabled electric generators (WEGs) are inefficient, wasting energy from discharged water.
  • There is a need for advanced WEGs that can utilize water in multiple forms.

Purpose of the Study:

  • To propose and develop a novel multistage coupling water-enabled electric generator (mc-WEG).
  • To enhance energy harvesting efficiency by utilizing both liquid water flow and generated moisture.
  • To demonstrate the mc-WEG's potential for powering diverse electronic devices.

Main Methods:

  • Designed a multistage coupling WEG integrating water-flow and moisture-diffusion electricity generation layers.
  • Employed a "flexible building blocks" strategy for modular construction.
  • Optimized electricity output through size control, space optimization, and large-scale integration.

Main Results:

  • Achieved a maximum output power density of ~92 mW m-2 (~11 W m-3).
  • Demonstrated direct power output sufficient to light a table lamp for 30 minutes using 22 series-connected units (~10 V, ~280 μA).
  • Showcased excellent flexibility and environmental adaptability.

Conclusions:

  • The proposed mc-WEG significantly improves energy utilization from water.
  • This technology offers a sustainable and adaptable solution for powering various electronics.
  • Paves the way for next-generation water-enabled electric generators.