SU144904A1 - Phase sensitive zero indicator - Google Patents

Description

Phase-sensitive zero indicators for automatic control systems are known. Usually they are made in the form of one-frame double-winding logometers, in which the second winding of the frame, being closed to the choke, serves as an electrical spring, i.e., creates a moment depending on the magnitude and sign on the angle of deflection of the movable part.

The proposed phase-sensitive zero indicator differs from the known ones in that it makes it possible to carry out in the tracking system an indication of the magnitude and sign of the deviation of the measured value from the predetermined value. This is achieved by using a ferrodynamic double-winding compensation logometer as a phase-sensitive element, one of the windings of which is used as a feedback winding of the tracking system.

The essence of the proposal is that one of the windings of the frame (working) is used to deflect the moving part of the device depending on the measured value, and the other (indicator) as the feedback winding. Induced in this winding variable e. d. the amplitude is proportional to the angle of deviation of the working winding from the middle position, its phase depends on the sign of the deviation (right or left), and the frequency is equal to the frequency of the flashing current in the magnetic circuit of the meter. This uh. d. amplified and used to automatically process the system at a measured value.

FIG. 1 and 2 depict the framework of the proposed indicator; in fig. 3 - a skeletal scheme of its application.

A feedback frame 2 is reinforced outside the working frame / compensation logometer. When the planes of the frames coincide with the neutral axis of the 3-4 magnetic system, ed. with. p frame 2 is zero. As the moving part of the instrument deviates from the neutral in frame 2, the emf appears. C. is proportional to the angle of rotation a (Fig. 2), and its phase depends on the direction of rotation of the frame relative to its neutral, and the frequency is equal to the frequency of the magnetic flux F in the magnetic circuit of the device.

The phase angle between the reference voltage 5 and the measured 6 (Fig. 3) is converted by the feedback winding of the compensation meter 7 to e. d. This uh. d. it is amplified by a conventional AC amplifier and is used to pull the motor 9, which runs the system in the numerical direction depending on the magnitude and sign of the phase angle between voltages 5 and 6.

At the conclusion of the plant, the Vibrator offer is new and can be used in measuring and regulating devices.

Subject matter

Phase-sensitive zero indicator for automatic control systems, characterized in that, in order to indicate the magnitude of errors, a ferrodynamic compensatory two-winding logometer is used in the phase-sensitive element, one of whose windings is used as a feedback winding of the follow- ing system.

.2

No. /

L1--4

FIG. 2

9g.Z