A Frequency Modulated Magnetically Coupled Piezoelectric Generator

Abstract

The invention relates to a frequency-modulation magnetic coupling piezoelectric power generator, and belongs to the technical field of power generation. A rotation shaft is arranged on a bottom shell,a rotation disc is arranged at an end part, an excitation magnet is embedded onto the rotation disc, a shell is arranged on the bottom shell, a threaded hole is formed in a top end, a first boss is arranged at the bottom of an inner side, an adjustment bolt extends into the shell through the threaded hole, a clamping plate is arranged at a bottom end and is limited in the groove of a loading block by a press plate, a second boss is arranged at a bottom end of the loading block, an upper end of a first piezoelectric oscillator is arranged on the second boss, a lower end of the first piezoelectric oscillator is arranged on a sliding block, the sliding block can slide in the limitation groove, an upper end of a second piezoelectric oscillator is arranged on the sliding block, a lower end ofthe second piezoelectric oscillator is arranged on the first boss, a simulated magnet is arranged on the first piezoelectric oscillator and the second piezoelectric oscillator, the simulated magnet and the excitation magnet are arranged in the same-polarity magnetic pole pair way, and the first piezoelectric oscillator and the second piezoelectric oscillator are arranged within an elastic deformation range when the adjustment bolt is arranged at an upper limit position and work within maximum allowable pressure range when the adjustment bolt is arranged at a lower limit position.

Description

technical field [0001] The invention belongs to the technical field of power generation, and in particular relates to a frequency modulation type magnetic coupling piezoelectric generator. Background technique [0002] With the popularization of micro-power wireless sensors and distributed sensing technologies in the fields of health monitoring, aerospace and program control systems, the environmental pollution caused by chemical batteries as the main energy supply method cannot be ignored. For this reason, miniature generators that recycle energy such as vibration energy, human body motion energy, rotational kinetic energy and fluid energy in the natural environment are widely favored at home and abroad. The rotary piezoelectric generator is one of the important methods to recover the kinetic energy of the rotating body. The main ways to realize energy recovery are inertial excitation, toggle excitation, impact excitation and gyromagnetic excitation. Among them, gyromagneti...

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Problems solved by technology

Although the gyromagnetic excitation solves the problem of impact and noise to a large extent, it still cannot avoid the problem of low power generation efficiency caused by the mismatch between the excitation frequency and the natural frequency of the generator under different working environments

In order to adapt to the working environment under different excitation frequencies, the concept of adjustable frequency is proposed. For example, Chinese patents 201210592977.8 and 201310211521.7 respectively conduct frequency modulation by electronic control and introducing nonlinear force, but the frequency modulation ability of the former is low, while the latter is due to the nonlinearity of magnetic force. Therefore, it is not easy to control accurately; in addition, both of them use the cantilever beam piezoelectric vibrator as the power generation unit, so it is easy to be damaged during the work process, and the safety is poor

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