SU28855A1 - Electric meter - Google Patents

Description

An electric measuring instrument with a bi-magnet, proposed by the inventors, differs from the well-known constructive form of implementation in terms of creating an opposing torque.

In FIG. 1 shows a perspective view of the device; FIG. 2-side section of the movable part; FIG. 3-embodiment of the device for creating an opposing torque.

The proposed device is supplied with a permanent magnet with an air gap. Near the air gap there is a pole piece 12, which is connected to one pole | of the permanent magnet and protrudes above the adjacent pole tip, thereby forming a narrow air gap intersected by a magnetic flux of relatively high density. Flat movable coil 13 of the device is located between the pole tips in this narrow air gap. . The coil is oval in shape and consists of a relatively large number of turns of thin insulated wire wound on a flat coil with side portions 14 and / 5, made preferably of aluminum and riveted, as shown by 16 in FIG. 2. The outer and inner surfaces of this coil are connected to the upper and lower trunnions 17 and 18, as shown in FIG. 2. These trunnions are metal and fixed in part 19, made of an insulating material, for example, bakelite, which results in mutual iso. qi rods. The side portions 14 and 15 of the coil are extended in order to enclose the shaft of the device and can be attached to it in any suitable way. This extension of the side portions also supports the arrow 20 moving on a scale of 27.

The washer and screw 35 serve to support the pole piece 12 and are made of a non-magnetic material (Fig. 1).

At low operating currents for a voltmeter, the upper and lower bearings can be made in the form of metal cups, indicated in figure 2 /, from phosphorous bronze or any other material.

The upper bearing, as shown in the drawing, is held in place by means of a leaf spring 22 attached to the pole piece 12. The lower bearing can be fixedly fixed to the base of the device. The leaf spring 22 holds the movable part in a rotational position, with the trunnions located in the recesses of the cup-shaped bearings.

A high resistance impedance coil, not shown in the drawing, is installed at the back of the device and connected in series with a moving coil, in turn, connected via bearings to the clips 24 and 25 (1). These clips extend to the back of the instrument for connecting to chains.

Despite the relatively weak current passing through the moving coil, a large moment is obtained due to the relatively strong magnetic field in which the coil is located. The coil can enter or exit a constant magnetic field in order to produce a deflection. As shown in FIG. 1 coil is designed so that it, with an increase in voltage, comes out of the floor; in other words, the polarity of the field created by the coil 13 is opposite to the polarity of the field created by a permanent magnet, so that these fields oppose each other and the coil tends to move to the left from a narrow air gap.

To obtain a deviation of the device in proportion to the current in the coil 13, an opposing torque is created. In the proposed device, this is accomplished with the aid of an elongated magnetic blade 26 on a shaft located between the poles 32 and 33 of the magnetic opening shown in FIG. 3. The source of the magnetic energy of the diverter is a permanent magnet 10 and a small part of its flow is directed through the magnetic parts 34 and 35, which are located under the pole edges of the main magnet. The outer ends of these parts are visible in FIG. 1. Pole-tips 32 and 33 are mounted on a non-magnetic plate 36, which can rotate around the center of rotation 21 in order to bring the arrow to the zero position. The required part of the flow, which is diverted through the blade 26 located on the shaft, can be precisely set by means of one or several air gaps in the path of the deflected flow. This part of the flux of the flux magnet, passing through the magnetic blade, tends to bring the blade to the position of the smallest magnetic resistance, which corresponds to the zero position of the pointer 20. The blade has corresponding shapes and dimensions to obtain a counter-torque, proportional to the moment of rotation of the device, whereby proportional to the current passing through the coil 13. It is advisable to use permalloy having a high n onitsaemostyu and low hysteresis. A change in permanent magnet strength will not respond well to the calibration of the device, since the flow of a permanent magnet is responsible for the formation of both the actuating movement and the restoring rotational moments.

The subject of the patent.

An electric measuring device with a stationary magnet, in the air gap of which a rotating movable one is located, a coil with a blade mounted on its axis of magnetic material, attracted to the poles of the permanent magnet and having a counter-torque, characterized in that it creates a field acting on the magnetic blade 26, ancillary nozzles 34, 35 VI devices are used, fixed on the plate 36, by moving the position of the blade 26 and, traces tion, the hand position on the zero point.

to the patent PC-NOY of the company „International Universal Electricity Company № 28855

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