SU756525A1 - Piezoelectric motor - Google Patents

Description

The invention relates to the field of electrical engineering and can be used in electric drives, for example in the drive of the electronic clock indicator.

A piezoelectric motor comprising a rotor, located on one side of it, is a first vibrator, made in the form of a piezoelectric element with longitudinal oscillations, and a second vibrator pressed to the rotor, U equipped with exciting electrodes on its main planes, and a generator connected to exciting electrodes second vibrator. In this engine, the second vibrator is also made in the form of a piezoelectric element with longitudinal vibrations and does not come in contact with the first vibrator, which is pressed against the rotor, and an additional plate 20 is inserted between the end of each vibrator and the rotor [1].

This engine has insufficient speed and lack of reliability when reversing, as well as low stability of the rotation speed 25.

A piezoelectric motor is known, comprising a housing, a rotor, vibrators preloaded against the rotor, made in the form of piezoelectric elements equipped with 30

2

exciting electrodes on their main planes, and a generator connected to the exciting electrodes of the vibrator [2].

The disadvantages of the known piezoelectric engine are low reliability and instability of the rotational speed.

The purpose of the invention is to increase the reliability and stability of the rotation speed.

This goal is achieved by introducing a delay line into the engine, the input of which is connected to the generator, and the outputs are connected to exciting electrolytes of vibrators, while the rotor is designed as a carrier with a roller that can be rotated around the carrier, and the vibrators are made with bending vibrations, one end rigidly fixed to the body in the direction of the carrier, and the other end pressing the roller to the body. Piezo elements in the zone of contact with the roller are connected to an endless belt made of an elastic material, for example, rubber.

FIG. 1 shows the engine, section A-A; in fig. 2 - the same, type 3

756525

four

hu; in fig. 3 - type B; in fig. 4. - engine piezoelectric element.

The engine contains a fixed body 1 with an axis 2, around which the carrier can rotate 3. The roller 4 is located on the carrier with the possibility of rotation around the carrier. A disk 5 is rigidly connected to the fixed case, on the peripheral part of which a disk is rigidly fixed in the direction of the carrier.

(soldered) vibrators 6 at one end. Vibrators are made in the form of piezoelectric elements with bending vibrations, while their other ends are glued onto an endless rubber band 7 in such a way that they press the roller to the body. Exciting electrodes are fed with alternating voltage from the delay line 8, the input of which is connected to the generator 9.

The piezoelectric motor works as follows.

To start the engine from the generator 9 an alternating voltage is applied to the input of the delay line 8. From the outputs of the delay line, an alternating electrical voltage is applied to the exciting electrodes of the vibrators 6. The electric fields in the vibrators 6 cause alternating bending deformation in the direction of the carrier. In this case, due to the phase difference of the oscillations of the piezoelectric elements, a traveling wave arises in the circumferential direction, which carries the roller 4, - and, consequently, drove the 3 along. Thus, the carrier 3 receives a rotational motion, the speed of which is mono adjusted by varying the frequency of the supply voltage.

To change the direction of rotation to reverse, they change the direction of movement of the traveling wave, and to stop the engine, the voltage supply to the piezoelectric elements 6 is stopped.

The piezoelectric motor has high reliability and stability of the rotational speed, since its rotational speed depends only on the frequency of the supply voltage.

Claims (2)

Claim 1. A piezoelectric motor, comprising a housing, a rotor, vibrators pressed to the rotor, made in the form of piezoelectric elements, equipped with exciting electrodes on their main planes, and a generator connected to the vibrator excitation electrodes, characterized in that, in order to improve the reliability and stability of the rotation speed , a delay line is introduced into it, the input of which is connected to the generator, and the output is connected to the exciting electrodes of the vibrators, while the rotor is designed as a carrier with a roller having the ability to rotate around Odila and vibrators are in the form of bending oscillations of piezoelectric elements with one end rigidly fixed on the housing in the direction of the carrier, and the other end of the pressing roller to the housing. 2. Engine pop. 1, characterized in that the piezoelectric elements in the zone of their contact with the roller are connected to an endless belt made of an elastic material, for example, of rubber.