SU1357915A1 - Piezoelectric motor position pulse regulator - Google Patents

Abstract

The invention relates to pulse devices of automatic control systems and can be used for relay, pulse and proportional control of the piezomotor position. Improving the reliability of the regulator is provided by reducing the peak currents flowing through the power amplifier elements and the piezoelectric motor due to the introduction of a current derivative sensor connected in series with the piezoelectric motor and in parallel with the inputs of the integrating circuit, which allows to increase the dynamic accuracy of the regulator. 1 il. from sl | with

Description

113

The invention relates to pulsed devices of automatic control systems and can be used for on-off, pulsed and proactive regulation of the piezomotor.

The aim of the invention is to increase the dynamic accuracy and reliability of the controller.

The drawing shows a structural diagram of the impulse controller of the field of the Keni of a piezomotor. ; The controller contains a reference element 1, a reference frequency generator 2,; a relay element 3, a power amplifier 4, an integrating circuit 5, a current derivative sensor 6, for example, an inductor I-, a piezoelectric motor 7.

The controller works as follows.

The reference signal through the comparison element 1 is fed to the first input of the relay element 3, the second input of which receives a signal from the generator 2 of the reference frequency. A burdock element (e.g., a two-input voltage comparator) performs a wide-pulse pulse-modulated modulation signal. The modulated signal is then applied to the input of the power amplifier 4, which can be built according to a bridge circuit, amplified in power and fed to the piezoelectric motor 7, in series with which the current derivative sensor 6 is connected. Since the piezoelectric motor 7 is an electric capacitor, the maximum current flowing through it and the elements of the power amplifier does not exceed the value of

one" .

where I is the maximum current value

hi

flowing through piezo

gatel 7, A;

and - supply voltage, V;

L sensor inductance 6, H; C is the capacitance of a piezomotor 7, F. The successively connected current derivative sensor and piezomotor are a high-frequency filter. The frequency of the reference frequency generator 2 is filtered by this circuit. Thus, on piezo 52

the motor is given a constant voltage proportional to the magnitude of the driving signal.

Electrically and mechanically, the parameters of the controller are interconnected by the relations

f

and

bNU;

.

e,

g

0

5 o Q

five

five

0

five

where f is the movement of the piezodvigate

l, m;

B - piezo module, mV; N is the number of piezoelectric plates; and - the voltage on the piezodvigate

le. AT; . - capacity p; architectonizer, F;

-current flowing through the piezoelectric motor. BUT;

-time, with;

C i

t e,

Jj c "

.

voltage drop on the sensor, V;

sensor inductance, GN; piezomotor acceleration, m / s

From the above ratios it can be seen that the voltage drop on the sensor 6, the derivative of the current is proportional to the acceleration of the piezoelectric motor. The voltage drop across the sensor of the derivative of the current e is fed to the input of the integrating circuit 5, which performs two functions.

Integrating circuit 5 filters the frequency of the generator. 2, has a constant component of the derivative of the current, and forms the frequency response of the controller, providing the necessary dynamic accuracy. The correction signal from the output of the integrating circuit 5 is fed to the second input of the comparison element 1.

In order for the correction signal e to be sufficient to ensure the required dynamic accuracy of the controller, the static gain of the integrating circuit must be equal to

to

LC K

g

L c

 where K is the static transfer coefficient of the integrating circuit;

sensor inductance, GN; piezoelectric capacitance, f; equivalent static gain from the first input of the relay element to the output of the power amplifier.

In the proposed pulse regulator of the piezomotor position, by inserting a sensor connected in series with the piezoelectric motor and in parallel with the inputs of the integrating circuit, the output of which is connected to the second input of the reference element, the peak currents flowing through the power amplifier elements and piezoelectric motor are reduced, which increases its reliability ; by introducing feedback into the circuit

 5 1357915

By integrating the circuit, an increase in its dynamic accuracy is achieved. In addition, by simplifying the controller, hardware costs are reduced and power losses are reduced.

Claims (1)

Invention Formula A pulse positioner of a piezoelectric motor containing a comparison element, the first input of which is the controller input, is connected to the first input of the relay element, the second input of which is connected to the output of the reference frequency generator, the output to the input of a power amplifier, characterized in that The purpose of increasing the dynamic accuracy and reliability of the controller is that it introduces a current derivative sensor and an integrating circuit, the input of which is connected to the output of a current derivative sensor connected between the output of the power amplifier and piezomotor, yield - a second input of the comparison element. Compiled by G. Nefedova. Editor I. Shulla Tehred. KhodanychKorrektor. Cherni 5997/48 Circulation 863 Subscription VNIIPI USSR State Committee . for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4