A Piezoelectric-Magnetoelectric Composite Microgenerator

Abstract

The invention discloses a piezoelectric-magnetoelectric compound micro-generator, which is mainly composed of two parts: a piezoelectric power generation part and a magnetoelectric power generation part. The magnetoelectric part adopts a single rotor plate type permanent magnet micro-generator structure; the piezoelectric part adopts a piezoelectric stack structure. Both parts share the same cylindrical generator housing. The piezoelectric part comprises a piezoelectric stack and a top screw. The top screw is fixedly arranged at the lower end of the generator housing and below the lower cover of the magnetoelectric part. The piezoelectric stack is mounted in the space formed between the top screw and the lower cover. When the micro-generator feels the impact environmental force, the piezoelectric power generation part begins to work. When the micro-generator feels the rotary inertia force, the magnetoelectric power generation part begins to work. According to the invention, the piezoelectric-magnetoelectric compound micro-generator adopts a compound power generation mode and in terms of the magnetoelectric power generation part, a rotary inertia force power generation mode is adopted. Simple in structure and small sized, the power density is large; the ability to withstand impact is increased; the time to activate the generator is shortened; the environmental force is fully utilized; and the generator can be used in a sealed environment.

Description

technical field [0001] The invention relates to a piezoelectric-magnetoelectric composite micro-generator, in particular to an impact-type piezoelectric and axial magnetic field magnetoelectric composite micro-generator, which belongs to the technical field of energy development. Background technique [0002] In recent years, micro-mechanical and electrical systems have developed rapidly, and the reduction in the volume of electromechanical systems requires the miniaturization of energy supply devices. Micro energy devices can be divided into two categories: micro chemical batteries and micro generators. The current main problem of micro-chemical batteries is that they carry limited energy, need to replenish energy regularly, and have poor self-sustaining power. The micro generator can actively obtain energy from the environment, which is a self-transducer, does not need to replenish energy regularly, and at the same time has no pollution itself, so it has a good developmen...

AI Technical Summary

Problems solved by technology

At present, such micro-generators at home and abroad all use magnet yoke rotation, such as the axial-flow pneumatic micro-turbine power generation system designed by Imperial College London, the variable reluctance micro-generator designed by the University of California, Berkeley, and the French LEG The planar micro-generator designed by the research team of the United States, the micro-generator co-designed by the Georgia Institute of Technology and the Massachusetts Institute of Technology, this type of micro-generator is large in size, complex in structure, low in conversion efficiency, and long in activation time

In addition, in some environments that need to be sealed, the ambient energy cannot be obtained through wind turbines, and this type of generator cannot work

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