JPS6241250Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cross-coil type meter that can reduce variations in index characteristics of a plurality of cross-coil type meters.

Generally, in a crossed coil type meter, a cup-shaped case for forming a magnetic circuit made of a soft magnetic material such as electromagnetic soft iron or permalloy is attached to the outer periphery of the crossed coil. However, in this type of case, the magnetic properties are slightly different between the rolling direction when the case is made and the direction perpendicular to it, so the rolling direction when the case is made and the magnetic field generation direction of the crossed coils, that is, the axial direction Unless a predetermined positional relationship is maintained, there is a drawback that the index characteristics of individual crossed coil type instruments vary.

The present invention was devised to eliminate this drawback, and by making it possible to determine the positional relationship between the rolling direction of the raw material of the cup-shaped case and the axial direction of the crossed coils, it is possible to It is an object of the present invention to provide a crossed coil type instrument that eliminates variations in index characteristics.

The present invention will be explained in detail below based on an embodiment shown in the drawings.

A movable magnet 1 is magnetized with two poles in the radial direction. The movable magnet 1 is supported by a pointer shaft 2, and a pointer 3 is attached to the tip of the pointer shaft 2. 4, 4' are upper and lower housings which also serve as coil bobbins, and the movable magnet 1 is rotatably housed inside these upper and lower housings 4, 4'. Cross coils 5 and 5' are wound around the outer peripheries of the upper and lower housings 4 and 4' at right angles to each other, and generate a composite magnetic field in a direction corresponding to the measurement signal. Reference numeral 6 denotes a cup-shaped case made of a soft magnetic material, and the bottom of the cup-shaped case 6 is provided with a positioning hole 7 into which a boss 4'a formed on the lower housing 4' is fitted. There is. The position of the positioning hole 7 is set in a constant directional relationship with the rolling direction of the cup-shaped case 6 when it is made of raw material. 8 indicates a mounting screw.

The configuration of the crossed coil type instrument according to this embodiment has been described above, and its operation will be described next.

Now, proceeding with the explanation with reference to the action explanatory diagram in Figure 3 and the directed vector diagram in Figure 4, in Figure 3, the strength of the magnetic field generated when the same voltage is applied to the coils 5 and 5' is Assume that they are the same. At this time, if the case 6 were not present, the same magnetic field would act on the movable magnet 1 from both coils 5, 5', so the pointer 3 would indicate the 45° position. However, case 6
Assuming that the rolling direction of is in the direction of arrow A,
Even though the magnetic fields generated by the coils 5 and 5' are the same, the magnetic flux path in the rolling direction of the case 6 is better than that in the direction perpendicular to the rolling direction, so as a result, the magnitude of the magnetic field in the coil 5 direction acting on the movable magnet 1 is becomes larger than the magnitude of the magnetic field acting on the movable magnet 1 in the direction of the coil 5', that is, the relationship between the indicated vectors becomes a>b, and the indicated value becomes an angle α larger than 45° (see FIG. 4). In addition, when the rolling direction of case 6 is in the direction of arrow A' in FIG. 3, the indicated value becomes smaller than 45° for the same reason.

Therefore, if the rolling direction of the raw material of the case 6 and the positional relationship, that is, the directionality, of the crossed coils are made the same for all crossed coil type meters, it is possible to eliminate variations in the individual index characteristics.

As described above, the present invention consists of a movable magnet 1 to which a pointer 3 is fixed, and a plurality of coils 5 and 5' which are arranged in an intersecting manner so as to surround the movable magnet and to which two-phase drive signals are input. , a crossed coil type instrument comprising a cup-shaped case 6 provided on the outer periphery of the plurality of coils 5, 5' and formed of a soft magnetic material, the rolling direction of the cup-shaped case 6 when it is made of material; the plurality of coils 5;
This cross-coil type instrument is characterized by having positioning means 4'a, 7 for maintaining a predetermined positional relationship with the axial direction of the case. This has the effect of eliminating variations in the index characteristics of individual crossed coil type instruments caused by variations in the positional relationship between the rolling direction and the axial direction of the crossed coils.

[Brief description of the drawings]

The drawings all show one embodiment of the crossed coil type meter according to the present invention, and FIG. 1 is a sectional view thereof, and FIG.
The figure is a plan view of only the case, FIG. 3 is a plan view for explaining the operation, and FIG. 4 is an instruction vector diagram. 1...Movable magnet, 2...Pointer shaft, 3...
Pointer, 4, 4'... Upper and lower housing, 4'a... Boss, 5, 5'... Coil, 6... Case, 7...
Positioning hole, 8...Mounting screw.

Claims (1)

[Scope of utility model registration request] A movable magnet 1 to which a pointer 3 is fixed, a plurality of coils 5, 5' arranged crosswise to surround the movable magnet and to which two-phase drive signals are input, and the plurality of coils 5, 5'. In a cross-coil type instrument consisting of a cup-shaped case 6 provided on the outer periphery of the 5' and made of a soft magnetic material,
A cross coil characterized in that positioning means 4'a, 7 are provided to maintain a predetermined positional relationship between the rolling direction of the raw material of the cup-shaped case 6 and the axial direction of the plurality of coils 5, 5'. type instrument.