Torsional vibration magneto-electric coupler based on Wedman effect and making method thereof

Abstract

A torsional vibration magneto-electric coupler based on the Wedman effect and a making method thereof are provided. In the torsional vibration magneto-electric coupler based on the Wedman effect, twopermanent magnets are uniformly distributed and bonded to the outer circumferential surface of a magnetostrictive cylinder to form a magnetic fastener. A piezoelectric cylindrical shell composite is formed by splicing 6 to10 piezoelectric strips with an arc cross section, and the number of the piezoelectric strips is even. During splicing, the splicing surface of every two adjacent piezoelectric strips is coated with an electrode layer of which the thickness is less than or equal to 0.5mm. The polarization directions of two adjacent piezoelectric strips are opposite. The polarization directions of two adjacent electrode layers are opposite. An annular DC magnetic field is generated by using the permanent magnets, and the annular DC magnetic field and an additional AC magnetic field form aspiral magnetic field. A stronger magnetoelectronic coupling effect can be obtained, and higher magneto-electric voltage signals can be output. Moreover, potential noise sources can be filtered, and the signal-to-noise ratio in the sensing mode can be further improved. The torsional vibration magneto-electric coupler has the characteristics of simple structure and miniaturization.

Description

technical field [0001] The invention belongs to the technical field of multiferroic magnetoelectric composite materials and structures, and relates to a magnetoelectric coupling device based on the Wiedemann effect and a manufacturing method thereof. Background technique [0002] Multiferroic magnetoelectric materials contain three types of properties: ferroelectricity, ferromagnetism and ferroelasticity at the same time, so they can realize the magnetoelectric effect, that is, the material generates a polarized electric field (positive magnetoelectric effect) under the action of an external magnetic field or The phenomenon of induced magnetization (inverse magnetoelectric effect). Compared with single-phase magnetoelectric materials, magnetoelectric composite materials can obtain strong magnetoelectric coupling effect at room temperature. have a broad vision of application. [0003] The core components of common magnetoelectric coupling devices are generally layered magne...

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the deficiencies in the prior art that are susceptible to lateral vibration signals and noise interference in the environment, the present invention proposes a torsional vibration magnetoelectric coupling device based on the Wiedemann effect and its manufacturing method

Images