Bi-directionally magnetically coupled and axially excited and limited rotating-shaft piezoelectric generator

Abstract

The invention relates to a bi-directionally magnetically coupled and axially excited and limited rotating-shaft piezoelectric generator and belongs to the field of piezoelectric generation. A cylinder is fixed between two bearing blocks by a bolt; multiple groups of static magnets I and static magnets II are alternately embedded on different cross sections of the internal wall of the cylinder; both the two bearing blocks are embedded with a bearing and a magnetic ring; a main shaft is arranged on the bearing block by the bearing; the spline of the main shaft is sleeved with multiple groups of piezoelectric transducers; and a pair of moving magnets are arranged at the free end of each of the piezoelectric transducers by bolts, and the opposite magnetic poles of the moving magnets are opposite. The piezoelectric generator has the advantages of no contact impact and noise, high reliability, convenience for providing electricity to a monitoring system rotating along with a rotating shaft, and capability of generating power at a constant or high speed.

Description

technical field [0001] The invention belongs to the field of piezoelectric power generation, and in particular relates to a shaft-type piezoelectric generator with two-way magnetic coupling axial excitation and position limitation, which is used for power supply of a rotating machinery health monitoring system. Background technique [0002] The research on constructing micro-scale piezoelectric generators by using sheet-type piezoelectric vibrators has become a hot spot both at home and abroad for many years. According to the different sources of motive power and application purposes of generators, cantilever beam piezoelectric generators with various structural forms have been proposed at home and abroad, mainly including vibration type and rotary type. Among them, the rotary piezoelectric generator was originally proposed to solve the self-powered sensor monitoring of rotating machinery such as helicopter propellers, automobile tire pressure, aeroengines / high-speed trains / ...

AI Technical Summary

Problems solved by technology

[0004] The common feature of the above three types of rotating shaft piezoelectric generators that rotate with the rotating body is that the piezoelectric vibrator deforms along the rotating direction of the rotating body, and the amount of deformation and power generation depends entirely on the rotating speed and rotation state of the rotating body. The disadvantages are: ①The deformation of the piezoelectric vibrator is uncontrollable, and excessive deformation will cause the piezoelectric vibrator to break, so the reliability is low; ②At high speed, uniform speed, especially uniform-high speed, the piezoelectric vibrator will not be damaged. Effective excitation, limited environmental adaptability and bandwidth

It can be seen that the existing rotary piezoelectric generators are not suitable for high-speed, uniform-speed or restricted space / structure applications such as helicopter propellers, aero-engines / high-speed trains / oil and gas drill spindles

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