Non-resonant piezoelectric generator with gyromagnetic excitation function

Abstract

The invention relates to a non-resonant piezoelectric generator with a gyromagnetic excitation function, and belongs to the technical field of power generation. A rotating shaft is mounted on a bottomshell, a rotating disc is mounted at the end, and an exciting magnet is embedded on the rotating disc; a top cover is mounted at the left end of a shell, and the right end of the shell is mounted onthe bottom shell; a plurality of spokes are arranged on a ferromagnetic base plate in the mode of extending from the center to the exterior, and the free ends of the spokes are mounted on the shell; piezoelectric crystal plates are bonded onto the spokes, and a formed composite layer constitutes a piezoelectric vibrator; a boss is arranged on the top cover, and a threaded hole is formed in the center of the boss; an adjusting bolt extends out through the threaded hole and is provided with a locking nut in a screwed mode; the adjusting bolt is provided with a protruding ring and abuts against the center of the ferromagnetic base plate; a buckling-pressing block is connected with the boss; when the adjusting bolt is leftwards adjusted to the limit position, the left end face of the protruding ring abuts against the boss, and at the moment, the ferromagnetic base plate is in an original state without bearing action force of the adjusting bolt; and when the adjusting bolt is rightwards adjusted to the limit position, the right end face of the protruding ring abuts against the bottom face of a countersink of the buckling-pressing block, and at the moment, the ferromagnetic base plate isstill in elastic deformation of the ferromagnetic base plate.

Description

technical field [0001] The invention belongs to the technical field of power generation, and in particular relates to a non-resonance piezoelectric generator with gyromagnetic excitation. 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, gyromagnetic...

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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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