Rotary piezoelectric generation device

Abstract

The invention relates to a rotary piezoelectric generation device, which is particularly suitable for collecting variable and random energy in an environment. The device increases the response frequency of a piezoelectric bimorph beam by utilizing a contactless permanent magnetic force, increases the response amplitude of the piezoelectric bimorph beam based on a bistable potential energy principle and improves output power. The device mainly comprises an exciting wheel, a regulating wheel, the piezoelectric bimorph beam and the like. Environmental mechanical energy is transmitted to the exciting wheel by a rotating shaft, the exciting wheel impacts the piezoelectric bimorph beam by utilizing the permanent magnetic force of a permanent magnet, and the response frequency of the piezoelectric bimorph beam is far higher than the frequency of the exciting wheel. The regulating wheel makes the piezoelectric bimorph beam in a bistable potential energy state, and can increase the response amplitude of the bimorph beam. The device provided by the invention has the advantages of simple structure, high energy conversion efficiency and the like, and can be applied to complex irregular natural environments.

Description

technical field [0001] The invention is a novel rotary piezoelectric power generation device, which is particularly suitable for collecting the changing rotational mechanical energy in a low-frequency vibration environment, and belongs to the technical field of micro-energy sources. Background technique [0002] Vibration in the environment is characterized by low frequency and random changes. At present, the main methods of using piezoelectric technology to obtain environmental vibration energy include: resonance adjustment, combined, frequency-increasing, and nonlinear vibration. Among them, the frequency-increasing piezoelectric power generation has a simple structure and high efficiency, and has attracted increasing attention. The main features of frequency-increased piezoelectric power generation: use mechanical collision or non-contact impact to increase the response frequency of the piezoelectric cantilever, and increase the output power of the piezoelectric cantilev...

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Problems solved by technology

[0003] Priya proposed a mechanical contact collision rotary piezoelectric generator (invention patent number: US2010 / 0052324A1), which can collect changing rotational energy, but the mechanical contact method has the disadvantages of mechanical energy loss and reduced service life

Rastegar and Murry proposed the concept of a second-stage rotary piezoelectric generator (J.Rastegar and R.Murray. "Novel two-stage piezoelectric-based electrical energy generators for low and variable speed rotary machinery". Proc. SPIE 7288, 72880B2009) , the use of permanent magnetic force to transmit non-contact impact improves the response frequency of the piezoelectric cantilever beam to low-frequency excitation, but the response amplitude of the piezoelectric cantilever beam is continuously attenuated when it is subjected to non-contact impact force

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