SU1656460A1 - Angular velocity sensor - Google Patents

Abstract

The invention relates to a measurement technique and can be used in control systems as an angular velocity sensor. The aim of the invention is to improve the accuracy and reliability of the sensor. The rotor of the sine-cosine rotary transformer 1 connected to the shaft to be measured rotates at an angular speed to be measured. The signal induced in its sinus winding is demodulated in amplitude demodulator 2 and fed to one of the inputs of multiplier 3, to the other input of which is connected the output of the feedback loop formed by filter 4, integrator 5 and cosine converter 6. In the device, tracking is performed for the output signal of demodulator 2, proportional to the angle of rotation of the shaft, The signal at the input of the integrator 5 of the tracking contour is proportional to the measured angular velocity, 2 or more.

Description

- figure 1

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О About O

The invention relates to a measuring technique and can be used to measure the angular velocity of rotating shafts of mechanisms and machines in electromechanical automatic control systems.

The aim of the invention is to simplify and improve the accuracy and reliability of the sensor.

Figure 1 shows the structural scheme of the proposed sensor; figure 2 - timing charts of the signals at the outputs of the blocks 2, 4 and 5 of the device.

The angular velocity sensor contains a sinus-cosine rotary transformer (SCWT) 1, amplitude demodulator 2, multiplier 3, filter 4, integrator 5 and cosine converter 6. The first input of the multiplier 3 is connected to the output of the demodulator 2 connected to the sinus input winding SCWT 1, the second input - with the output of the converter 6, connected by its input to the output of the integrator 5, and the output - with the input of the filter 4, connected by its output to the output of the sensor and to the input of the integrator 5.

The angular velocity sensor works as follows.

The rotor of the ACS 1 rotates at an angular velocity w, which is to be measured, in its sinus winding a signal is induced at a supply frequency, the amplitude of which is proportional to the sine of the angle of rotation of the rotor. This signal is fed to the input of demodulator 2. At the output of the latter, a signal Da of the form

1) 2 AO sin a,

where AO is a constant level determined by the total transfer coefficient of SQFT 1 and demodulator 2.

The signal U2 (Fig, 2) is fed to the first input of the multiplier 3.

At the output of converter 6, a signal Us is formed

Ue Ueocos / 3,

where Ueo is a constant level determined by the total transfer coefficient of the integrator 5 and converter 6;

ft is the angle of rotation of the rotor of SCPT 1, measured by the integrator 5.

The signal Ue arrives at the second input of the multiplier 3. At the output of the multiplier 3, a signal Uz is generated, proportional to the product of the signals at its inputs:

Ouse - K3U2Ue - Кз АО U6o sin a cos / 5 К3 АО U60

sin ("- / J) +

+, n (a +) i

where Kz coefficient of multiplication 3.

Filter 4 is a low pass filter. Signal 11z pass filter

4, averaged and amplified with simultaneous noise suppression and high frequency

Кз АО U60,,, a (а + р). Whitefish

component

down U at the output of the filter 4 has the form

U4 J lJ 3AoUeo s | p (

0

five

0

five

0

five

0

five

where Ks - the transmission coefficient of the filter 4.

The signal 1M is fed to the input of the integrator 5. At the output of the latter, a signal is generated that is equal to the measured value / Zugla of the rotation of the rotor of the ACS 1.

In the steady-state mode, the rates of change of the angles ai / are equalized, and the phase output of the displacement becomes constant, proportional to the rate of change of these angles.

Thus, the sensor is a tracking system that monitors the angle and rotation of the rotor of the ACS 1.

The LM signal at the input of the integrator 5 (at the output of the filter 4 and the sensor as a whole) is proportional to the derivative of the angle (3. Since the rates of change of the angles a. And / 3 are equal in the steady state, this signal is proportional to the angular velocity w to be measured.

Claims (1)

The invention of the angular velocity sensor, containing a sine-cosine rotary transformer, amplitude demodulator, the input of which is connected to the sine winding of a sinus-cosine rotating transformer, multiplier, the first input of which is connected to the output of the amplitude demodulator, and the series-connected filter, the output of which is a sensor output, an integrator and a cosine converter, the output of which is connected to the second input of the multiplier, characterized in that, in order to simplify and enhance the and reliability of the sensor, it filters the input connected to the output of multiplier. Fig 2