SU1420676A1 - Method of unidirectional circular polarization of piezoelectric elements - Google Patents

Abstract

The invention can be used to manufacture igneously controlled filters, transformers, motors, zalerl and other elements and devices in engineering. The purpose of the invention is to increase the mechanical strength and reduce the laboriousness of manufacturing cement elements with unidirectional circular polarization. For this purpose, in the cornea 1, filled with dielectric fluid 2, there are electrically conductive sliding contacts 3 and 4, which are partly loaded into the dielectric fluid 2 of cylindrical piezoelectric element 5, which is rotated around its axis. During the rotation, each portion of the circumference of the cylindrical piezoelectric element 5 is exposed to an electric field in a smaller area of the diezoelectric element 5. To reduce the depolarization of a large part of the cylindrical piezoelectric element 5, bounded by contact lines, this part is not immersed in the dielectric liquid 2, but carried to the air. 2 h. n. f-ly, 5 ill. with S (L

Description

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The invention relates to methods for polarizing piezoelectric elements and can be used to manufacture piezoelectric filters, transformers, motors, delay lines, and other elements and devices of piezo-technology with torsional oscillations excited in piezoelectric elements.

The aim of the invention is to increase the mechanical strength and reduce the complexity of manufacturing piezo elements from sliding contacts 3 and 4 with a cylindrical piezo element 5. The ratio of the length of a small arc / cylindrical piezo element 5, limited (Fig. 1) to the contact points of the conductive sliding contacts 3 and 4, to the circumference of the cylinder 2nR it is necessary to choose from the condition of 0.1 C // 2l /; 0.25. If, 25, depolarization of the polarized state occurs by a reverse field in a larger area

non-directional circular polarization. Yu piezoelectric element 5, in which the vector for example - In FIG. 1 schematically shows the floor of the electric field is directed

The installation for implementation against polarization. If // 2l / 0,1,

the proposed method of polarization; There is no justifiable increase in the time needed. 2 and 3 - polarization of the hollow and polarization. Only following a continuous piezoceramic cylinder, the ratio between the length of a small arc /, respectively, after circular polarization with a circumference of 2l; / does not provide

getting polarized to saturation. To further reduce the depolarization of a large part of the piezoelectric element, limited by contact lines, this 2Q part is not immersed in a dielectric liquid, but is taken out into the air. An even better result is obtained by blowing cold air into this part of the piezoelement.

..... If the contact lines of the sliding

Tactically immersed in the dielectric contacts 3 and 4 with the cylindrical piezo-liquid 2, the cylindrical piezo-element-element 5 is parallel to the generatrix of cyta 5, which is rotated around its axis. Electroconductive gliding konkrugovoy polarization of the proposed method in the arrangement of electrically conductive glide contacts along the generator of the cylinder, in FIG. 4 and 5 is the same when the sliding contacts are arranged at an angle a to the generator.

The polarization unit (Fig. 1) contains a case 1 filled with dielectric fluid 2. In case 1 electroconductive sliding contacts 3 and 4 are located, touching the surface of the cylinder, in the piezoelectric element 5 after polarization, residual uniform circular polarization occurs, and the field vector They are connected to a source of high voltage. ,,. at each point of the cylindrical with the help of conductors 7 and 8, respectively ..-.-- po.l.- .. m .. “o .-. and. .urnu ,, u.nu.

the strokes are pressed to the piezoelectric element 5 and the sub-dielectric fluid 2 is heated to the required temperature by means of the heater 9.

The method is as follows .25

A cylindrical piezoelectric element 5 rigidly fixed to the shaft (shaft and fastening elements not shown), which can be rotated in the housing 1, is partially immersed in the dielectric fluid 2 heated by means of the heater 9 to the temperature specified in the specifications for this piezoceramic material. sliding contacts 3 and 4 supply voltage from source 6, and a cylindrical element

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Claims (1)

1. A method of unidirectional circular polarization of cylindrical piezoelectric elements, which coctorate in the influence of polarizing voltage on a heated piezoelectric element, characterized in that, in order to increase mechanical strength and reduce is driven into rotation. The time of rotation of the complexity of the manufacture of piezoelectric elements (T) is calculated from the ratio of unidirectional circular polarization, 7, the cylindrical piezoelectric element is partially loaded into the heated dielectric where / radius of the piezoelement; fluid, the submerged part is pressed / - small arc length, bounded by the electric wire and their sliding cone 50 tact contact in contact with the cylindrical sliding contacts; piezoelectric element along the lines parallel to i the polarization time indicated in the formative, electrically conductive contacts of TexHH4ecj Hx conditions on a piezokera-. apply a voltage greater than the metallic material of the coercive, and rotate the piezoelectric element. During this time, each section of the circumference around its axis, and the effect of the electrical piezoelectric element is affected by the 55th field and the rotation is performed in a thermoelectric field during a period of time in the smaller area of the piezoelectric element, bounded by contact lines p, - 2n / T i. sliding contacts 3 and 4 with cylindrical piezoelectric element 5. The ratio of the length of a small arc / cylindrical piezoelement 5, bounded (Fig. 1) by the contact points of electrically conductive sliding contacts 3 and 4, to the circumference of a 2nR cylinder must be selected from condition 0, 1 С // 2л /; 0.25. If, 25, depolarization of the polarized state occurs by a reverse field in a larger area in each point of a cylindrical ..-.-- f.li.- .. m .. “o .-. i ,. .urnu ,, u.nu. piezoelectric element 5 has only a tangential component (Fig. 2 and 3). If the lines of contact of the sliding contacts 3 and 4 with the cylindrical piezoelectric element 5 are located at an angle to the generatrix in the piezoelectric element 5, residual polarization occurs, and the polarization vector has both a tangential and axial component at each point. Invention Formula 1. A method of unidirectional circular polarization of cylindrical piezoelectric elements, which coctorate in the influence of polarizing voltage on a heated piezoelectric element, characterized in that, in order to use the raised gadfly of the centerline, it rotates and rotates and, in addition, rotates time p, - 2n / T i. where R is the outer radius of the piezoceramic cylinder; / is the length of the small arc bounded by the contact contactors that form the sliding contacts; t is the polarization time specified in the specifications for a specific piezoceramic material. A method according to claim 1, characterized in that not immersed in a dielectric fluid FIG. 2 FIG. part give. piezoelectric force forced3. A method according to Claim 1, characterized in that, in order to produce a neso-elemeite having axial and circular polarization components, the electrically conductive slippers contact these contact with the cylindrical piezoelectric elements along helical lines forming an angle with the generator. Fig.Z FIG. five