SU1040413A1 - Shaft turn speed determination device - Google Patents

Abstract

DEVICE FOR DETERMINATION OF RELATE ROTATION SPEED, containing ,,. // h, .. in l ...,; /-,,.-: .., Shg ... / I to & sine-cosine rotary transformer, comparator connected to the sinus winding of a rotating transformer connected to the output of the comparator chronograph and source of reference levels with a switch, in order to improve accuracy at small angles of rotation and expand the scope , the source of the reference levels is made in the form of a voltage divider c-rN + l connected in steps to the cosine winding of a rotating transformer, while the transmission coefficients of the divider steps: equal to the tangents of the angle s shaft position of the rotary transformer, determined. § Lueymi number of steps. (L 4 ;: about 00

Description

The invention relates to the technique of automatic control and regulation with sensors such as sine-sinus rotary transformers and can be used to obtain information about the angular 5 speed of rotation of the shaft.

Sinus-cosine rotating transformers are known, to the output of which various different transformation schemes are connected to obtain information about the speed of rotation 11 ..

The closest to the one proposed is a device for. time-to-voltage conversion — a pulse signal containing a signal source, a comparator connected to a signal source and a source of reference levels with a switch, and connected to the output of a comparator chronograph 2. 0

The disadvantages of the known device include the low accuracy of the velocity measurement at low angles of rotation.

The purpose of the invention is to povigeniya measurement accuracy at small angles / gate.

The goal is achieved by the fact that in the device for: measuring the speed of shaft rotation, containing a blue-30 no-cosine rotating transformer (SC), a comparator connected to the sinus winding of a rotating transformer, connected to the output of a comparator chronograph and source of reference: 35 levels the switch, the source of the reference levels is made in the form of voltage sharing with N +1 steps, connected to the cosine winding of the rotating transformer, while the factor 40 of the divider transmission levels is equal to the angular n tangents expansions shaft rotating transformer .opredel proxy numbered stage.

The drawing shows the scheme of Reystva.

The proposed device contains a SCRT, which is an angular position sensor of shaft 2 connected to a stabilized gyroplatform, a compiler 3 connected by a first input to the sinus output of a SCRT, and an output to chronograph 4, a second input of the comparator 3 via commutator 5 and divider 6 is connected to the cosine output of the ACS. The coefficients of the transmission steps divide-p5 l

H i-1it 1 (",, selected angular positions of shaft 2,

control points for measuring their transit time with billow 60, 2

The device as follows.

Measurements of the speed of rotation of the shaft 2 begin, having previously exposed (5

on SCWT the angular position of the shaft Switch 5 provides a connection to the second input of the comparator 3 of the first stage divider b. When shaft 2 rotates at time V 4, comparator 3 operates, while chronograph 4 fixes the passage time of this point by shaft, and switch 5 at the command of comparator 3. connects second stage divider b with gear ratio ij4 to its second input. Comparator 3 will trigger the next operation of comparator 3 at the angular position of the shaft 24, This time also fixes the chronograph 4 at the command of the comparator 3, after which the switch 5 connects to the second input of the comparator 3 the third divider stage b with the transfer coefficient. -t / fixes the third point. 1 etc.

The measurement of the shaft rotation speed in N consecutive sections is achieved by performing a divider by N +1 steps, and a switch by N +1 positions, while the transmission coefficients of the DELITEL steps are equal to the tangents of the angular shaft positions selected as intermediate measuring points. Envelope voltage At the sine and cosine outputs of the SCRT, you can write, respectively.

U5 UsinV; . .

Ucos

where H - the current angular position of the shaft.

The voltage at the input of the comparator is for the position of the switch corresponding to the connection of the first stage of the divider with the coefficient i-c - / {where M ;; - the angular position of the shaft of the beginning of the measured sectionJ has the form

/ 5inCV-V U UfsinV-cosVto-V- Ui1: 1 / -.

V cos.

Obviously, if V- (2h-l) TO at, A (J - O.ETO means that the comparator is activated at the angular position of the shaft H) Similarly, it can be shown that after the comparator fixes the time of the initial-angular passage through the chronograph The position of the shaft 4-1 will switch the second input of the comparator to the second stage of the divider with the transmission coefficient V V another operation: the comparator occurs at H.j while the chronograph will record this point in time.

. As the switch 5, a multiplexer with a control register in the form of a shift register can be used, or the usual stepper detector can be used. Chronograph 4 can use 9 electromechanical or electronic with access to digital printing device.

31040413Л

The speed of rotation of shaft 2 is known by the gyroscope drift not only from its own direction and does not change the BW, fixed errors, but mainly KOLKA shaft 2 is determined by the rotation of the Earth.

Claims (1)

DEVICE FOR DETERMINING THE SHAFT TURN SPEED, comprising a sine-cosine rotating transformer, a comparator connected to the sinus winding of the rotating transformer, a chronograph connected to the output of the comparator, and a reference level source with a switch, taking into account that, in order to increase accuracy at small angles of rotation and expansion of the scope, the source of reference levels is made in the form of a voltage divider with: N + 1 steps connected to the cosine winding of a rotating transformer, while the coefficients What is the transfer ratio of the divider stages? equal to the tangents of the angular positions of the shaft of the rotating transformer, as defined. § number of steps