Research On The Mechanism Of Magnetic Coupling Piezoelectric Energy Capture Based On Rotational Motion

In recent years,wireless sensor devices have been widely used in municipal,military,medical,and industrial production,and the study of how to power the sensors has received widespread attention.Currently,wireless sensor devices are mostly powered by batteries,but batteries have a short service life,high replacement cost,and are difficult to miniaturize.Mechanical vibration energy is widely used in people’s daily life as a potential alternative energy source.Converting vibration energy in the environment into electrical energy to power sensors is the most promising technology.In this paper,the key technology of piezoelectric energy capture in rotational motion is studied,and a piezoelectric energy capture device is designed to realize the conversion of mechanical energy to electrical energy in a rotational motion system and improve its energy conversion efficiency.The details of the research are as follows.The classification and characteristics of piezoelectric energy capture devices,as well as the history and status of development at home and abroad,are summarized.The shortcomings of the piezoelectric energy capture device are analyzed,and the design ideas of the magnetically coupled piezoelectric energy capture device based on rotational motion are obtained.The basic theoretical knowledge of the piezoelectric effect and the piezoelectric equation is introduced.The properties of three piezoelectric materials,namely,piezoelectric ceramic wafers,piezoelectric polymer films and piezoelectric composites,and their manufacturing processes are introduced.The basic structure of piezoelectric elements,mechanical clamping methods and vibration modes are introduced to provide guidance for the selection of piezoelectric elements.A magnetically coupled piezoelectric energy capture device based on rotational motion is designed;the working principle of the piezoelectric energy capture device,the force on the piezoelectric beam,and the theory of the piezoelectric energy capture system are analyzed;a theoretical guide is provided for the design of a magnetically coupled piezoelectric energy capture device based on rotational motion.The simulation analyzes the law of the influence of spacing on the magnetic force in the piezoelectric energy capture system,and the law of the influence of external force on the deformation performance of the piezoelectric oscillator.It provides guidance for the design and fabrication of the prototype of a magnetically coupled piezoelectric energy capture device based on rotational motion.The experimental prototype of the piezoelectric energy capture device was fabricated.The experimental platform was built and tested.The experiments analyzed the influence of structural parameters of the piezoelectric energy capture device on the output voltage.The load power characteristics of the piezoelectric energy capture device were tested to obtain the relationship between the load resistance and the output performance of the piezoelectric energy capture device.The superiority of the designed magnetically coupled piezoelectric energy capture device based on rotational motion is verified.