SU1035578A1 - Method and device for controlling electrodynamic vibrator - Google Patents

Abstract

1. A method of controlling a rotary electrodynamic vibrator, which is to ensure the interaction of the current of the moving coil and magnetic induction of biasing by means of the moving coil and the tlOR magnetization winding, characterized in that, in order to simplify maintaining the amplitude of the constant coil, and the winding of the line, it is possible to have a headline and a tlOR magnetization. , the bias winding is powered by an alternating current with a frequency equal to the frequency of the current of the moving coil and continuously changes the phase between the current of the moving coil podmagnychivsshi and current windings, the rate of change of phase determines the vibration frequency. 2. A device for controlling an electrodynamic vibrator, containing an alternating current source, a moving coil and a bias winding, distinguishes it by TV (/) which, in order to simplify maintaining the amplitude of a constant and adjust the phase of the exerted force in the operating frequency range, it contains a phase inverter, and as an alternating current source, a synchronous generator is used, the output connected to the moving coil directly; veino, and to the winding of the magnetizers through the phase shifter. CO Cfi ate 00

Description

The invention relates to a vibration technique and can be applied during vibration tests, shield vibration and seismic prospecting.

A known method of controlling an electrodynamic vibrator, in which the vibrating moving coil is fed with alternating current, and the coagulation winding is fed from a constant constant voltage source Cil.

A device implementing this method contains an electrodynamic vibrator, a power amplifier, a broadband voltage amplifier with two inputs, one of which is supplied with a control signal, and the other a feedback signal proportional to the current value of the movable coil. .

The closest to the invention in its technical essence is the method of providing interaction between the current of the moving coil and the magnetic induction of the magnetizer by powering the movable coil and winding the magnetizing j 2J-.

However, maintaining a constant amplitude of the excited force in the frequency range is rather difficult in this way, and this method does not provide phase control.

The closest in technical essence to the invention is a device for controlling an electrodynamic vibrator containing an alternating current source, a moving coil and a bias winding (Z.

However, the device has a complex control system that does not control the phase of the excitation force in the operating frequency range.

The aim of the invention is to simplify maintaining the amplitude of a constant and adjusting the phase of the excited go-amplification in the operating frequency range.

The goal is achieved in that, according to the electrodynamic vibrator control method, the bias winding is powered by an alternating current with a frequency equal to the current frequency of the moving coil and continuously changes the phase between the current of the moving coil and the bias winding current, while the rate of change of the phase determines the frequency vibrations.

The method is implemented by a device comprising an alternating current source a moving coil and a bias winding. To simplify maintaining the amplitude of a constant and adjust the phase of the excited force in the operating frequency range, it contains a phase rotator, and a synchronous generator is used as a source of alternating current, the output connected

to the moving coil directly, and to the bias winding through the phase shifter.

The drawing shows a functional diagram of the proposed device.

The device consists of a synchronous generator 1, an output connected via a phase shifter 2 to the winding of the magnetization 3 of the electrodynamic vibrator 4 and directly to the moving coil 5.

The method is carried out as follows.

The force F (–fc) developed by the electrodynamic vibrator is determined by the expression

i) W2i (t) ..

 (I.

 - the number of turns of the moving carcass involved in the creation of force,

b - the length of one turn of the mobile coil,

1) j is the current of the moving coil, 6 (|.) Is the induction of bias, the current of the moving coil changes according to the law

W) (t) (t-4.) (1)

induction

0- (1)

e) - the amplitude of the current of the moving coil J

 - the initial phase of the current of the moving coil; g, is the amplitude of induction of jumpdown;

(- initial induction phase

In magnetization;

and - a continuously varying phase between the current of the moving coil and the induction of arming.

Substituting A 2) and (3) into (1 gives after converting

B „, Dlco5 (H)

(t) nH-l :) (4)

IF Denote () W (i) ni (t)) this expression (4) transforms to

F (t) lt) °) .t5)

those. The developed force contains two harmonic components: the first with the frequency SS. and the initial phase Q + tj and the second with a frequency of 2m + 51 and the initial phase g-. It is possible to construct a mechanical vibrator system in such a way as to filter one or another component. for example

By tuning the mechanical system to resonance at frequency 62 and to antiresonance at 2ttH-Sl, one can achieve a nearly harmonic signal.

The rate of continuous change of the phase f {t) between the current of the moving coil and the induction of bias determines the frequency of the vibration / and at a constant rate of change of the phase the frequency of the vibration or 2w + SI remains constant.

By changing the frequency of vibration, it is enough to change the rate of change of phase W. The change in the phase of vibration can be provided either by changing the initial phase of the moving coil current) pj, or by changing the initial phase of induction of the magnetic field ffc. . Regulation of the amplitude of vibration is ensured by the current amplitude or induction of magnetic suppression.

The method is implemented as follows.

When the synchronous generator 1 is turned on, its voltage is applied to the moving coil 5 at a frequency that generates an electric current in it with the same frequency c). The same voltage of the generator 1 through the phase shifter 2 is applied to the magnetization 3. The phase of the winding current of the magnetization 3 is continuously changed by the phase shifter 2 with the speed Si. The interaction of the current of the moving coil 5 and the induction of bias excites the force of vibration, the frequency of which determines the degree of change in the phase of the current of the bias magnetic winding.

Dp phase change vibrations change the phase voltage of the synchronous generator 1, to change the amplitude

5 vibrations change the amplitude of the output voltage (1-time synchronous generator 1;

The use of the proposed invention simplifies maintaining the stability of the gap and controlling the phase of the excitation force in the operating frequency range. Moreover, when choosing a high frequency supply voltage, the overall dimensions of the device are reduced.

Claims (2)

1. The method of controlling the electrodynamic vibrator, which consists in ensuring the interaction of the current of the moving coil of non-magnetic induction of magnetization by powering the moving coil and the magnetizing winding, characterized in that, in order to simplify the maintenance of the constant amplitude and regulating the phase of the excited force in the operating frequency range, the magnetization winding is powered carry out alternating current with a frequency equal to the frequency of the current of the moving coil, and continuously change the phase between, the current of the moving coil and the current m biasing winding, the phase change speed determines the frequency of vibration. 2. Device for controlling an electrodynamic vibrator containing an alternating current source, a moving coil and a magnetizing winding, characterized by> that, in order to simplify maintaining the amplitude of the constant and regulating the phase of the excited force in the operating frequency range, it contains a phase shifter, and as a · source of alternating current a synchronous generator is used, the output is directly connected to the moving coil; but to the magnetization winding through a phase shifter.