SU68223A2 - Device for measuring magnetic and electrical quantities - Google Patents

Description

The object of the present invention is an embodiment of a device for measuring magnetic and electrical quantities according to the author's certificate No. 67548. In the device according to the main author's certificate, the magnetic circuit was made in the form of a branched and closed luver-shaped magnetic circuit, one of the diagonals of which was used as the magnetic circuit measuring device, and the second - as a magnetic system of a generator or other source of magnetic flux, flowing around the entire system of the bridge. In this case, it was possible to locate in the gap the magnetic circuit of the movable system of measuring devices of various types, in particular, of the electromagnetic and magnetoelectric types.

The present invention is a development of the device according to the main evidence for the case of using a movable system of a measuring device of the magnetoelectric type.

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Distinctive features of the proposed device are:

1) in one embodiment - placing in the field of a flux-producing magnet of a core, equipped with a winding connected with a moving system of a measuring device, and made reset with respect to the bridge magnetic conductor; The purpose of using this core is to create a phase shift in the alternating current feeding the moving system of the meter;

2) alternatively, the inclusion in the circuit of the measuring system of a measuring device of an alternating capacitor in order to equation the phase of the current in the moving system with the flow in the diagonal of the bridge;

3) in both versions - placing a compensation winding on the diagonal rod of the bridge in order to compensate for the zero deviation of the measuring system of the measuring device, and to the gauge to ensure the operation of the device in the proportion of 163

Most of the magnetic characteristics of the flow of the diagonal of the bridge.

The invention is illustrated by a schematic drawing in which both variants of the device are shown.

In the device in the first embodiment, the movable system 2 of the measuring device receives power from the winding 7 of the magnetic core (the circuit is shown by a dotted line). The variable electromotive force is induced in the latter by the same rotating magnet 6, which excites the main magnetic flux in the bridge system and, therefore, they coincide in frequency. The core 7 can be switched to any angle relative to the main magnetic circuit 3. Thus, the electromotive force induced in the winding 7 of the moving core can be shifted in phase by any angle relative to the variable flow in the main system of the bridge.

In the device according to the second embodiment, in which the mobile system of the measuring device receives power from the winding 4, which is worn on the magnetizing part J of the magnetic circuit, a variable capacitor 5 is connected to the winding circuit 4. The use of a variable capacitor allows the phase shift to vary between the magnetic flux in the bridge diagonal 7 and the current in the moving system 2 of the measuring device to achieve the highest sensitivity of the latter.

Along the way, it should be noted that there is no need to limit the main bridge system to four shoulders, as shown in the drawing. The shoulders of the bridge may have additional ramifications with bias windings, which expands the possibilities of simultaneously supplying several compared values.

In both embodiments of the device, an additional winding 8 may be provided, worn on the diagonal rod of the bridge. It can be switched on either in parallel or in series with frame 2 of the device and can have a dual purpose.

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The winding 8 can serve as a compensation winding to eliminate the initial disequilibrium of the bridge, caused by the heterogeneity of the individual arms in the magnetic relation. In this case, the winding is selected and turned on in such a way that its effect compensates for the initial deviation of the indicator, resulting from the above reasons. Such a zero fit is easier to accomplish than, for example, pripilovka cores forming the shoulders of the bridge.

Another purpose of the winding 8 may be to create some initial deflection to bias the starting point of the magnetization curve of the diagonal into an area proportional to a portion of this curve. It is possible, of course, for the same purpose to make a diagonal of a bridge from a material of high initial magnetic permeability, for example, of the Permallo type. This ensures proportionality of the instrument scale, which is necessary when using the device as a non-equilibrium bridge, or to increase the sensitivity of the device when the latter is used as a null indicator.

Subject invention

Claims (3)

1. An embodiment of a device for measuring magnetic and electrical quantities according to author's certificate No. 67548, characterized in that in order to create an alternating current phase powering the moving system of the measuring device, in the field of the flux-inducing magnet a core is provided with a winding connected to specified by the moving system, and performed perestavny relative to the magnetic bridge. 2. A device change according to claim I, characterized in that a capacitor is included in the circuit of the moving system of the measuring device in order to equation the phase of the current in the moving system with the flow in the diagonal of the bridge. 3. The form of the device according to pp. 1 and 2, which differs from By the fact that, in order to compensate for the zero deviation of the moving system of the measuring device, as well as to ensure the operation of the device in the region of the proportional part Aiar of the flow characteristic of the diagonal of the bridge, a compensation winding is worn on the diagonal rod of the bridge.