SU31503A1 - Electrodynamic measuring device - Google Patents

Description

The present invention consists in the construction of a known electrodynamic measuring device, in which a moving coil moves in an uneven magnetic field. According to the invention, in order for the magnetic field at different points along the path of the said moving coil (frame) to be different both in size and in direction, the frame is fixed on the center of the two fixed, arc-curved circles, rectangular coils, eccentrically with respect to to the circle formed by these curved coils.

In FIG. 1 is a side view of the device; FIG. 2 is a section through the VGna line of FIG. one; FIG. 3 and 4 is a side view and in section of one of the fixed coils.

Two rectangular coils with a small axial length of 4 to 5 (Figs. 3 and 4) are curved along an arc of a circle in a plane perpendicular to the axis of each of them (Fig. 2) and arranged so that one is a continuation of the other (Fig. 2). The axis / rotation of the frame 3, mounted on the end of the shoulder 2, is placed eccentrically to the specified circle. When a current of the corresponding direction passes in each of these coils 4 and 5, a magnetic flux is created, the distribution of which is roughly indicated by dotted lines with arrows (Fig. 2).

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If in the moving frame 3 the current will circulate so that the magnetic flux of this frame will be directed from the center to the periphery, i.e. at the position of the frame indicated in the drawing, its direction will be opposite to the direction of the magnetic flux of the fixed coils 5 to 4, then the moving frame will tend to rotate around its axis (approximately 320 degrees) in the direction indicated by the arrow and take relative to the coil 5, the same position as it originally occupied with respect to coil 4. Since the direction of the magnetic flux generated by the moving frame will be radial all the time, as clearly seen from the drawing (Fig. 2), as the frame moves around the will change, both the magnetic field voltage (due to the change in the distance between the moving frame and the stationary coils) and the angle between both magnetic fluxes, i.e. the necessary condition will be satisfied for a corresponding change in the mutual induction of the framework.

By giving the coils 4 5 different shapes, the law of change of mutual induction can be changed as the moving frame moves along a circle, it is possible to achieve that the moment around the whole circle remains constant or changes according to any necessary law.

Thus, the rotation of the frame in the proposed instrument is due to two reasons: first, the change as the frame moves along the circumference; directing the magnetic flux relative to the frame, with a constant voltage magnetic field, and, secondly, changing as the frame moves along the circumference, the voltage of the magnetic field (i.e., the distance between the source of the magnetic field — stationary coils and moving frame), with the same magnetic flux direction relative to the frame.

The subject matter of the invention. ,

An electrodynamic measuring device in which a moving coil moves in an uneven magnetic field, characterized by the use of two stationary, curved along an arc of a circle, rectangular coils 4 and 5 arranged in such a way that one is an extension of the other, and a frame 3 reinforced by an arm 2 on the axis I and the rotating eccentric to the specified circle so that the field in different frame positions is different in magnitude and in direction.

Fig 1

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FIG. 2

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