SU1416947A1 - Vibration-type drive of vertical step displacements - Google Patents

Description

(21) 4044J67 / 24-24

(22) 01.04.86

(46) 15-808. Bul No. 30

(71) Kaunas Polytechnic Institute, Antanas Snechkus Titus

(72) M.E.A.A. Fox

(53) 62-50 (088.8)

(56) USSR inventor's certificate No. 981174, class B 06 B 1/06, 1980.

. USSR author's certificate No. 1287088, class „G 02 B 7/11, 1985.

(54) VIBRAODONIC DRIVE VERTICAL STEP-UP CHANGE

(57) The invention relates to

control step motion and can be used in the optical-mechanical industry for precise installation of the object in a predetermined position. The aim of the invention is to compensate for the dependence of vertical step movements on the change in the weight of an object in the direction of its movement. This goal is achieved by controlling the duration of the high-frequency modulated pulses acting on the vibratory drive, according to signals fixed on the accelerometer drive, 3 sludge.

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The invention relates to devices for controlling the step motion and can be used in the optomechanical industry to precisely position an object at a predetermined position.

The purpose of the invention is to increase the stability of the vertical step movements of the object.

The diagram shows the device; in fig. 2-section A-A in FIG. one; in fig. 3 shows the dependences of the displacement step on the strength of the body of the moving object.

The device contains mounted in a cylindrical case 1 ring electromechanical transducers 2 oscillations with waveguides 3 mechanical oscillations, which are connected with a support screw 4 "by means of a thread. Bracket 5 is attached to the upper part of screw 4, and accelerometer 6 is attached to the upper part of the screw. in contact with the surface of the movable object 7. The output of the accelerometer 6 is connected to the input of the analog-digital converter 8, and the output of the latter is connected to the first input of the microprocessor 9. The second input microprocessor 9 through a driver, 10 video pulses are connected to the low-voltage output of a multiphase generator 11 pulses of controlled duration with high-frequency modulation, and the high-voltage output of the latter is connected to the inputs of electromechanical transducers The output of microprocessor 10 is connected to the control input of the duration of a multiphase pulse generator 11 pulses.

The device works as follows.

In the initial position, the screw 4 is in a hindered state due to the effect of frictional forces between the contacting threaded surfaces of the reference interface 4 and the waveguides 3 mechanical vibrations.

When applied to a piezoceramic transducer 2, the pulse voltage from a multiphase generator 11 in the transducers impulses a pulsed mechanical oscillation, which is transmitted by the waveguide 3 mechanical oscillation. Under the influence of oscillations, the support screw 4 carries out stepping movements up or down.

0

depending on the order of connecting the phases of the modulating signal to the electromechanical transducer m 2. The accelerometer 6 at the same time produces a voltage pulse proportional to the screw

now with angular acceleration

ft multiplied by the length L of the crown 5c. After being converted to an n-fronted form in the analog-digital converter 8, this signal is sent to the first information input of the microprocessor 9 The second information input of the microprocessor from the output of the video pulse former 10 receives the video pulses whose duration is equal to the duration of the stimulated pulse voltage on electromechanical transducers 2 oscillations In the microprocessor, the length of the video pulses is measured and the sig ala, approximately proportsio5 napnogo indexing object S, the following formula:

H - k cr dt

0 where k is the coefficient of proportionality

When the calculated signal deviates from the specified value of the step motion stored in the memory

From the microprocessor, at its output, a signal is generated that corrects the pulse duration of the multiphase generator of 11 pulses until the calculated and specified GO values are completely equalized.

The dependences of the displacement step on the gravity force P of the movable object when it is moved up (curves 13) and down (curves 12) are shown in the absence of control of the pulse duration and if there is such control (curve 14) o

Thus, the proposed device makes it possible to compensate the effect of changes in the weight of the object being moved and the direction of movement on the value of the movement step about

55

Claims (1)

Invention Formula Vibrational drive of vertically {scaled step motions containing fixed in a cylindrical body; ring electromechanical transducers of oscillations connected by their inputs to the output of a multiphase pulse generator; which differs from the fact that, in order to increase the stability of the stepping movements of an object, it additionally contains fixed on the support screw with JL /, using a bracket, an accelerometer, an analog-to-digital converter, a video pulse former and a microprocessor, the output of which is connected to the input of a multi-phase pulse generator and the accelerometer output through Analog-to-digital converter is connected to the first information input of the microprocessor, the second information input of which is connected to the low-voltage output of a multi-phase pulse generator about srig.1 sriah (ig.Z