SU440127A1 - Piezoelectric transformer - Google Patents

Description

one

This invention relates to the field of &

 technology and can be used in app1

Reception, as a selective element,

 The known piezoelectric transfilter is a low frequency filter whose piezoelectric element 1 is made in the form of a fixed bimorph -. | a bar with a mass attached on a free rim; it has significant dimensions.

The purpose of the invention is to lower the resonance; the frequency and the reduction of the transfilter dimensions.

I This is achieved by the fact that the proposed transfilter is made of a piezoceramic spiral, the maximum of which increases in proportion to the length, and the inertial mass

made in the form of a flywheel.

Fig. 1 shows the construction of the proposed transfilter; on fng. 2 - the same section; Fig. 3 is an electrical circuit for activating a transfilter.

A piezoelectric transfilter generates a piezoelectric element in the J-OUT of a piezo-keyer - 1k: a helix 1, the inner and outer surfaces of which are covered with electrodes, Two ends of the helix are attached to the massive

JHenoaBii MObiy rod 2 is pressed into the hole in the lower part of the body and one | time; a &h; tschg.-usr output pin | for the internal spiral electrode. At its end, the helix is attached to j-rod 3. but not supported on the flywheel 4 /, the fixed fly-wheel 4 is fixed on the metal Axis 5, the ends of which are located in two "black cors. 6 bearings 7 | 8 | to cover 9. The cover is fixed with pins 1О and .11, fixed in the housing 8, and glue. It is connected to the housing (housing 8 and | cover 9 are made of plastic). ; YOU - in the form of wires is connected pokr: g with the electrodes of the surface of the piezospirapi with rg: Lead pins are brought out of the case and electrically connected to the end of the lestkamk (a f; 1 d. 2 shows two blades 14 and 15,

connecting with discharge pins12: L 13),

 The inner surface of the spiral is completely covered by electrode 16 (conventionally shown

It’s like a shipper.

the piezospiral is covered with two electrodes 17 and 18, which divide the outer surface into two equal parts,

If a bimorphy spiral is used, the electrode between the two layers corresponds to the surface of the electrode 16 in FIG. 3, and external - respectively, the surfaces of the electrodes 17 and 18.

Electrodes 16 and 17 are the inputs, 1c and 18 are the output.

When an electrical source is connected to the input electrodes, an electrical signal arises, the maximum value of which is reached at the resonant frequency of the mechanical span. For the piezoelectric spiral, a low-frequency resonance is characteristic, which cannot yet be attributed to any of the known types of oscillations (most of all this corresponds to bending with torsion). By this, the resonance frequency can be reduced to 10 Hz with ra6apt Tox not more than 1 cm.

The inertial mass makes it possible to decrease the oscillation frequency by an order of magnitude and to produce a piezoelectric filter at a resonance frequency of about 1 Hz.

Claims (1)

Invention Formula  A piezoelectric transfilter containing a piezoelectric element with electrodes deposited on its surface, one end of which is rigidly fixed and an inertial mass attached to the free part, is made of piezoceramic to reduce the resonant frequency and reduce its dimensions. the helix, whose height increases in proportion to the length, and the inertial mass in the form of a rotary flywheel. 12 15 15 (.2 Fig.Z