A high-efficient piezoelectric wireless energy transmission system based on magnetic force coupling

Area of Science:

• Acoustic Energy Transfer
• Wireless Power Systems
• Materials Science

Background:

• Wireless energy transmission is crucial for powering devices in inaccessible or sensitive areas.
• Existing methods face limitations in efficiency and applicability in shielded or biomedical environments.

Purpose of the Study:

• To develop and demonstrate a highly efficient and robust acoustic wireless energy transmission system.
• To investigate the feasibility of transferring mechanical energy wirelessly through air and metal plates.

Main Methods:

• Utilized a piezoelectric cantilever-based transmitter and receiver.
• Employed permanent magnets for strong magnetic coupling to transfer mechanical energy.
• Conducted experimental studies to measure voltage and power transmission efficiencies.

Main Results:

• Achieved voltage transmission efficiencies of 55.59% (air) and 51.58% (air-metal-air).
• Demonstrated maximum power transmission of 42.73 mW at 104.2 Hz.
• Confirmed system robustness and efficiency in transferring energy wirelessly.

Conclusions:

• The proposed acoustic wireless energy system offers high efficiency and robustness.
• Suitable for powering devices in enclosed, electrically shielded, and biomedical applications.
• Magnetic coupling significantly enhances mechanical energy transfer.