SU769331A1 - Differential transformer sensor - Google Patents

Description

measles is moving; .on . 2 shows a diagram of the connection of the sensor windings; and FIG. 3 - the sensor, where the O-shaped cores are applied to the housing, inside which is moved Я1К01р; in fig. 4 - a sensor with closed magnet tubes of the oval shape covering the cylindrical body and with a different location of the source of the standing MESFACE (in FIGS. 1, 3 and 4) are not shown (WRAP, but their NUMBER and connection circuit are similar to windings on Fig. 2.).

-Differential-transformer sensor contains closed O-cores 1 n 2, connected by a T-shaped core 3, measles 4, connected to an o-rga ohm 5 supervised worker and which is separated from the magnetic system of the sensor by a cylindrical diamagnetic screen (non-magnetic shell) 6. For the magnetic resistance of the magnetic resistor (Fig. 1), the closed O-shaped | Serdechnik 1 and 2 are equipped with poles 7, located in a plane perpendicular to the core 3. In another, the M variant of the sensor (Fig. 4) poles 7 are absent, so; as in less core diameters to it Diaphragm shield 6. In T-image (Ny core 3 is embedded a source of 5 constant magnetic FIELD, made in the form of permanent magnets. Source, 8 Can also be made in the form of a winding, on the M-wave on the T-shaped Core, And connected to a DC source. Winding / and 9 and 10 (Fig. 2) are interconnected in sequence, and according to and connected to the source of a parallel voltage, and windings 11 and 12 are connected, consistently and counter to each other. As cores / and 2, it is advisable to use cores made of 1 material with high magnetism and permeability and rectangular corner and rotate ani.

The sensor works as follows.

With a symmetric polol: eni and core 4 relative cores / and 2, the magnetic flux of the current source S of a constant magnetic field passes through the T-shaped core 3, koryu 4 and cores / and 2, equally. Driving this on the secondary windings .11 and 12 are induced by different EMFs, and - at THEIR (On-Off switching, the output Sipnal is equal to zero.

When the core 4 is displaced relative to the average position, the magnetization of the cores / and 2: becomes unequal (subampling of one increases, and the other decreases). Emf induced in

The windings 11–12 will also be different and therefore a difference signal appears at the sensor output. Since cores / and 2 are made of a material with high magnetic permeability and a linear magnetization curve, the measurement of the output signal is large with insignificant changes in the degree of magnetic biasing. The absence of losses to eddy currents also contributes to an increase in sensitivity. Hysteresis: is, because it is closed as a flow, created by an uninterrupted current passing through a circuit 9 and 10, it closes completely and only by heart and 2. In order to increase the sensitivity, the alternating current is chosen at a significantly higher frequency than in the known sensors.

At the same time, the influence of magnetic-magnet deformation of 9 and 10 is excluded. On the operation of a number of devices located, such as their magnetic LOTO. The core of 1 and 2 is closed, i.e. there is no scattering. The possibility of working through a thick-walled conductive non-magnetised oblobkalochka value. But it will clearly wipe out the sensor's application area. Since only a constant magnetic flux passes through the envelope, its shielding effect is excluded, so that the measles can be inside a sealed volume or volume with an aggressive medium, and the sensor itself is outside this volume.

The economic effect of using the proposed technical solution is due to its technical advantages.

Claims (2)

Invention Formula Differentially - a transformer sensor, containing a magnetic core with windings connected in. Pairwise consistently consistently and sequentially, the source of the magnetic field and core, located in a cylindrical diamagnetic screen, about By the fact that, in order to increase the sensitivity of the sensor, the magnetic core in it is made in the form of two 0-shaped cores interconnected by a T-shaped heart core into which the magnetic source of a constant magnetic field . Sources 1Info | ma.ci: and, taken into account in the examination; il. Instruments and automation equipment, 1963, No. 11, p. 801-806. 2. USSR author's certificate N ° 313086, .kl. G 01 D 5/22, 1970 (prototype).