HomeProjectsRobotics and Advanced ManufacturingSelf-Powered Smart Watch and Wristband Enabled by Embedded Generator

Self-Powered Smart Watch and Wristband Enabled by Embedded Generator

Project Quick Facts

Principal Investigator

  • Prof. LIAO Wei Hsin

    Department of Mechanical and Automation Engineering

  • Funding

    Innovation and Technology Commission

  • Patent

    1 US patent application and 1 China patent filed

  • Award

    Gold Medal, International Exhibition of Inventions Geneva 2021

Smart watches and wristbands are helpful in health monitoring, sport training, living assistance, etc. However, due to critical size limitation and high-power requirement, battery endurance becomes a big issue that the devices need to be frequently recharged, which even causes “battery anxiety” among the users. Although capturing the kinetic energy from arm swinging renders a promising solution, it’s a challenging task to produce high power in a limited size. To achieve this, we invented an embedded and highly efficient generator with coaxial topology to integrate motion capture unit, magnetic frequency-up converter and power generation unit in a thin and compact device, which allows it to be embedded in the smart watches and wristbands. Despite of integrating several parts in a highly compact device, the mechanical structure is concise and easy for fabrication. At the same time, to increase the energy efficiency, the mechanical friction is reduced by using magnetic transmission and compact skew-ball-like bearing. The testing results showed that our embedded generator can achieve maximum power of 1.74 mW and normalized power density of 820.38 μW/cm3·Hz2, which are more than 4 and 10 times that of the counterparts.

Uniqueness and Competitive Advantages:

  • 4x output power and 10x power density compared with existing technologies
  • Improves energy conversion efficiency by eliminating mechanical friction
  • Avoid damage caused by impact force, saving maintenance or replacement
  • Compact and easily embedded in variety of wearable electronics
Principle and design of the embedded generator
Prototype of the embedded generator

Do you like our project?