SU476583A1 - Motion transducer to the time interval - Google Patents

Description

The invention relates to the field of information measuring equipment and can be used in digital devices for measuring non-electrical quantities by electrical methods.

Displacement transducers in a time interval are known, comprising a cylindrical magnetic core of a material with a rectangular hysteresis loop, a measuring winding located on the magnetic core, and two permanent magnets located inside the magnetic core, one of which is connected to a moving object.

The purpose of the invention is to increase the speed of the converter.

For this, the proposed measurement transducer is equipped with two concentric ferromagnetic cylindrical screens located in the gap between the magnets and the magnetic core, one of which is fixed and has two pairs of windows located above the poles of both magnets, and the second is kinematically connected to the engine and has two pairs of windows turned one relative to the other by 90 °.

FIG. 1 schematically shows the proposed converter; in fig. 2 - scheme of its inclusion; in fig. 3 - timing diagram of the movement of the movement X fi (t)

(Fig. 3, a), induction in the magnetic circuit B / 2 (O (Fig. 3, b), voltage at the output of the output / s (0 (Fig. 3, 0); Fig. 4 shows the graph of the movement of the operating point along the magnetization curve of the material of the magnetic circuit.

The converter contains a cylindrical magnetic circuit 1 with a measuring winding, a movable permanent magnet 2, kinematically connected with a controlled object,

and a fixed permanent magnet 3 located coaxially inside the magnetic circuit, one magnet being magnetized in the opposite direction with respect to another. In the air gap between the magnetic core and the magnets there are two concentric ferromagnetic cylindrical screens 4, 5, one of which 4 is stationary and has two pairs of windows 6-9 above the poles of both magnets, and the other screen 5, having two

pairs of windows 10-13, one of which (10, 12) is rotated relative to the other by 90 °, is kinematically connected with engine 14, which drives it at a constant angular velocity.

When the movable screen 5 is rotated on the magnetic core, the magnetic fluxes of the movable and stationary magnets are alternately closed. When combining windows 11, 13 rolling

the screen 5 with the corresponding windows 7, 9 of the fixed screen 4 create gaps through which the magnetic flux from the moving magnet 2 closes on the magnetic circuit 1, which is reversal from the initial state, characterized at the time) by residual induction - Br (point O in Fig. 4 ) over the private cycle of the magnetization curve O-I-2 by the value BI, which depends on the X position of the magnet, which is the input quantity. When the movable screen rotates with an increase in the gap area at the poles of magnet 2 from zero at up to a maximum at time t ti (with full alignment of windows 11, 13 and 7, 8), the induction in the magnetic circuit changes from -BG to BI-Vg (FIG. 3, b). With further movement of the screen 5, the areas of the slots are reduced from the maximum at t ti to zero at the moment of time (when the slots are closed) the induction in the magnetic circuit remains equal to B) -Gr.

With an increase in the input value X, i.e., with an increase in the area of the part of the magnet poles overlapped by windows 7, 8, the rate of increase of induction in the magnetic core increases (i.e. the angle a in Fig. 3, b) in the time interval when the screen 5 rotates with constant angular velocity. Obviously, the angle a (Fig. 3.6) and the magnitude of the induction BI when the screen is rotating will be a function of the average value of X over the time period ti-to. When changing the induction in the time interval, the current in the measuring winding 15 located on the magnetic core 1 does not flow due to the presence in the circuit of the diode 16 (Fig. 2).

Upon further movement of the screen 5 at the moment of time t t3, the combination of the windows 10, 12 of the movable screen with the corresponding windows 6, 8 of the fixed screen begins and, through the gaps created by this, the magnetic flux from the stationary magnet 3 closes the magnetic circuit and begins to reversal it from point 2 (Fig. 4), on the private cycle of the magnetization curve 2-3-4-O (Fig. 4). With an increase in the slot area at the poles of the stationary magnet from zero at up to a maximum with full overlap of windows 10, 12, 6, 8, the induction in the magnetic circuit changes from BI-Vg to -Vr at / 4 at a constant speed, characterized by the angle p ( Fig. 3, b). The time of induction change, i.e., the time t is determined by the value of B, that is, the value of the angle a. By the time

 the gaps at the poles of the stationary magnet are closed and the cycle ends.

When the induction is changed from BI-Br to-Br in the time interval in the measuring winding 15 (Fig. 1, 2) a pulse is induced

voltage, the duration of which increases with increasing induction Vb. Obviously, the duration of the output impulse t is proportional to the average value of the input quantity - the displacement X of the movable

permanent magnet over a period of time (Fig. 3, c). Increasing the speed of rotation of the movable screen increases the speed of the device.

Subject invention

A displacement transducer for displacement into a time interval containing a cylindrical magnetic conductor from a material with

a rectangular hysteresis loop, a measuring winding located on the magnetic core, a permanent magnet that is kinematically connected to a controlled object, and a fixed permanent magnet located coaxially inside the magnetic core, characterized in that, in order to increase speed, it is equipped with two concentric ferromagnetic cylindrical screens located in the gap between the magnets and the magnetic core, one of which is fixed and has two pairs of windows located above the poles of both magnets, and the second nematically linked to the engine and has two pairs of trenches rotated one relative to the other by 90 °.

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