SU1245871A1 - Differential-transformer transducer of angle shifts - Google Patents

Abstract

The invention relates to a measurement technique and allows to expand the range of controlled movements and the reliability of a transformer angular displacement sensor. The sensor is a magnetic bridge, the ferromagnetic arms of which are formed by two cross-connected and parallel-mounted one another coaxially unlocked ring branches. On the axis of symmetry of the magnetic bridge, there is a ferromagnetic jumper between these branches, on which the field winding is located. The movable diagonal of the bridge (sensor rotor) is made in the form of parallel radial rods connected by a round rod — a crossbar located on the sensor axis. The crossbar is covered with a gap fixed measuring winding. In the case of an angular movement of the rotor, an unbalance of the magnetic bridge occurs and an emf is induced in the measuring winding, connected in magnitude and phase with the magnitude and direction of the angular displacement of the rotor. At the same time, the range of controlled movements is close to 360 °, and since the measuring winding is stationary, the reliability of the sensor increases. 2 Il. and (/ ee 4i 01 CX)

Description

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The invention relates to a measuring technique and can be used to control the angular displacements.

The purpose of the invention is to increase the range of controlled movements and increase reliability by eliminating sliding contact and changing the design of the magnetic circuit.

Figure 1 shows the transformer angular displacement sensor, a general view; FIG. 2 is a schematic representation of a sensor deployed in the plane of a stationary magnetic circuit.

Transformer Angle Sensor

The displacements contain a stationary magnetic conduit, made in the form of two coaxially mounted, parallel to each other open circular branches 1 and 2, connected crosswise, and located on its axis 3. the symmetry of the ferromagnetic bridge 4 between these branches. ,

The implementation of the magnetic circuit is in its form similar to the doubled figure of eight. The jumper 4 contains an excitation winding 5 connected to an AC power source (not shown). Coaxially with the annular branches 1 and 2 of the magnetic circuit, a ferromagnetic U-shaped rotor 6 is mounted for rotation, made in the form of two radial rods 7 connected by a crossbar 8 mounted for rotation on the axis 9 of a fixed magnetic circuit. The crossbar 8 has the shape of a round rod, coaxially with which a fixed measuring winding 10 is placed, separated from it by a gap. The radial rods 7 of the rotor are placed in the space between the annular sections 1 and 2 of the magnetic circuit with a small air gap relative to their lateral surfaces. The rod of the crossbar 8 of the rotor is connected in the process of measurement with the object of control

The sensor operates as follows. Cross-connected annular branches 1 and 2 of the fixed magnetic core together with the rotor 6 form a magnetic bridge, fed from the source of magnetic flux created by the excitation winding 5 (Fig. 2). The rotor 6 is the movable diagonal of this bridge. Etc

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the symmetrical position of the rods 7 of the ferromagnetic rotor 6 relative to the jumper 4 of the magnetic circuit with the excitation winding 5 the magnetic bridge is balanced, the total magnetic flux through its movable diagonal (through the rods 7 and the crossbar 8) is zero and, therefore, the EMF induced in the measuring winding 10, also equals zero. This position of the rotor - 6 corresponds to the initial position of the sensor. With an angular displacement: r rotor 6, for example, to the right of the initial position, the ratio of the lengths and, consequently, the magnetic resistances 5 iacTKOB, located respectively to the left and right of the rod 7, for branch I becomes large: and for branch 2 - lower than the initial value of the magnetic resistance in the equilibrium position of the bridge. As a result, the balancing of the magnetic bridge is violated, and a magnetic flux of the unbalance of the bridge begins to flow through the rods 7 and the crossbar 8 of the rotor 6, which is proportional to the magnitude of the angular displacement of the rotor from the initial position. When the rotor deviates to the other side from the initial position, the phase of the unbalance magnetic flux changes by 180 °.

The unbalance magnetic flux induces an emf in the measuring winding 10, and the magnitude and direction of the angular displacement of the rotor 6 and the test object associated with it in the measurement process are determined in the measuring winding 10.

The magnitude of the working angular displacement of the rotor 6 is limited to linear pasMepaiMji of the intersecting portions of the non-magnetic core and is about ± 170. Since the measuring winding of the sensor is stationary, and for its steem from its measured signal, it is not necessary to use slides from {5Нх contacts or flexible wires, the reliability of the sensor increases.

Claims (1)

Invention Formula - Transformer angular displacement sensor containing a stationary magnetic conductor with an excitation winding placed on it, a ferromagnetic rotor made in the form of two-axis radial rods, and a measuring winding covering the rotor, in order to increase the range of controlled displacements and increase reliability, the magnetic core made in the form of two coaxially mounted, parallel to each other, unclosed ring branches connected crosswise and located on its axis of symmetry The bridges between these branches, on which the excitation winding is placed, the rotor is made U-shaped with a crossbar in the form of a round rod rotatably mounted coaxially with the magnetic core, and the measuring winding is installed coaxially with respect to the rotor crossbar and is separated from it by a gap. Phme. / Editor A. Kozoriz FIG. 2 Compiled by I. Kislitsyn Tehred M. Khodanich Proofreader V. But ha Order 3985/31 Circulation 670 Subscription VNIIPI USSR State Committee for inventions and discoveries P3035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4