JP2001099903A - Magnetic sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an arrangement structure of the direction of a magnetic core in a magnetic sensor and the winding directions of an X-coil and a Y-coil. SOLUTION: In this sensor 1, a direction 8 where a ribbon material, shown in Fig. 3 for a magnetic core 3 of the sensor 1, forms 45 degree is constituted to be conformed with winding directions of the X-coil 4 and the Y-coil 5, as shown in a top view of Fig. 1 (a).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic sensor used for a compass or the like, in particular, a direction of a magnetic core and an X-ray to the magnetic core.
The present invention relates to an arrangement structure of a coil and a Y coil in a winding direction.

[0002]

2. Description of the Related Art A conventional magnetic sensor disclosed in Japanese Patent Application Laid-Open No. 9-43322 will be described in detail with reference to an exploded view of the conventional magnetic sensor shown in FIG. The magnetic sensor 40 includes a magnetic core 44a, an X coil wound around the magnetic core 44a and formed from X coil patterns 41c and 41d, a Y coil formed from Y coil patterns 42c and 42d,
This is a flux gate type magnetic sensor including an exciting coil formed by exciting coil patterns 43c and 43d.

Next, a method of manufacturing the conventional magnetic sensor 40 will be described. The magnetic sensor 40 includes an X coil pattern substrate 41a formed by etching an X coil pattern 41c for forming an X coil, and an X coil pattern 41.
X coil pattern substrate 41 formed by etching d
b and a Y coil pattern 42 for forming a Y coil
and a Y coil pattern substrate 42b formed by etching the Y coil pattern 42d and an excitation coil pattern 43c formed by etching an excitation coil pattern 43c for forming the excitation coil. An excitation coil pattern substrate 43b formed by etching the substrate 43a and the excitation coil pattern 43d is manufactured, and the X-coil pattern substrate is formed on the upper and lower surfaces of the magnetic core substrate 44 carrying the ring-shaped magnetic core 44a. 41a, Y coil pattern substrate 42b, Y coil pattern substrate 42a, X coil pattern substrate 41b, excitation coil pattern substrate 43a,
Each of the etched portions is combined in the order of the excitation coil pattern substrate 43b so as to be conductively laminated, and then pressed and manufactured. The X coil has through-holes 45 (represented by through-holes 45 because of a large number of through-holes), and is formed by connecting corresponding through-holes in a pattern as shown in X coil patterns 41c and 41d. You. The Y coil and the exciting coil are formed in the same manner. X coil, Y coil, excitation coil 2 each
Terminals are respectively 46a, 46b, 47a, 47b,
48a and 48b.

[0004]

FIG. 3 is a diagram showing the relationship between the direction of the ring core 31 and the direction of the ribbon material 30. As shown in FIG. As shown in FIG. 3, when the ring core 31 is formed from the ribbon material 30, the ribbon material 30 is manufactured by being rolled through rollers, so that the ribbon material 30 is formed in the ribbon material width direction 6 and the ribbon material length direction 7. It has two different magnetic anisotropies, and the width direction core portions 6 a and 6 of the ribbon material of the ring core 31.
B and magnetic properties represented by the magnetic permeability and the holding force in the circumferential direction of the ring core 31 of the longitudinal core portions 7a and 7b.
-H curves are generally different. On the other hand, the 45-degree direction core portions 8a and 8 in the 45-degree direction 8 of the ribbon material with respect to the width direction.
The BH curves in the circumferential direction of the ring cores 31b, 8c and 8d are generally the same as each other.

However, in the conventional magnetic sensor 40 shown in FIG. 4, the direction of the magnetic core 44a and the X coil,
Nothing is disclosed about the relationship of the winding direction of the Y coil. For this purpose, the ring core 31 alone or the magnetic core 44a formed by laminating the ring core 31 is used.
The X coil and the Y coil wound around, for example, the X coil is the same as the ribbon material width direction 6 of the ribbon material 30 of the magnetic core 44a.
In the case where the Y coil is wound in the ribbon material length direction 7 of the ribbon material 30 of the magnetic core 44a, the Y coil is related to the detection sensitivity of the magnetic sensor 40 which is a flux gate type magnetic sensor.
The X-coil and the Y-coil are wound, and the BH curves in the circumferential direction of the magnetic core 44a of the width-direction core portions 6a and 6b and the length-direction core portions 7a and 7b are different.
The detection outputs of the coil and the Y coil differ. Next, this will be described.

FIG. 6 is an explanatory diagram of a magnetic field H component. As shown in FIG. 6, the X coil of the magnetic sensor 40 and the X coil of the Y coil
When the magnetic field H is applied at an angle θ to the X axis with respect to the X axis perpendicular to the winding direction of the coil and the Y axis perpendicular to the winding direction of the Y coil, the detection output of FIG. Are the detection outputs of the X coil and the Y coil,
X coil detection output VX50, Y coil detection output VY51
Is approximately represented by the following equations (1) and (2).

(Equation 1)

(Equation 2) Here, as shown in FIG. 5, VXm50a, VYm5
1a is the amplitude of the detection output of the X coil and the Y coil, VX050b and VY051b are the offset and θX, respectively.
050c and θY051c are phase shifts.

From the equations (1) and (2), the angle θ of the magnetic field H can be generally obtained by the following equation (3) since θX0 and θY0 can be approximated to zero.

(Equation 3)

As a result of the difference in detection characteristics between the X coil and the Y coil, the offsets VX050b and VY051b are different.
Further, the amplitudes VXm50a and VYm corresponding to the detection sensitivity
51a is also different. Normally, the four parameters can be corrected in a circuit by combining the offset and the amplitude. However, if the correction value is large, the number of the parameters is large after the correction, and the correction error is obtained by the angle θ obtained by Expression 3. Effect on the accuracy of
The accuracy of the angle θ was not always satisfactory. In addition, since the amplitudes of the detection outputs VX50 and VY51 are different from each other, considering the variation between the detection outputs VX50 and VY51, the processing voltage range in the subsequent A / D conversion is increased, and the balance between the detection outputs VX and VY is considered in consideration of the power supply voltage. Sufficient S / N could not be obtained because sufficient amplification could not be obtained, resulting in poor accuracy of the angle θ.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has a direction of a magnetic core of a magnetic sensor and windings of an X coil and a Y coil around the magnetic core for facilitating the handling of the detection output of the magnetic sensor in a circuit. It is an object to provide an arrangement structure in a turning direction.

[0010]

A substantially rectangular substrate having one of an X coil pattern, a Y coil pattern, and an exciting coil pattern is laminated with a substrate carrying a magnetic core as a core and formed by the X coil pattern. A magnetic sensor comprising an X coil, a Y coil formed by the Y coil pattern, and an excitation coil formed by the excitation coil pattern, the magnetic sensor detects a magnetic field around which the X coil of the magnetic core is wound. The magnetic characteristics of the magnetic field detection unit around which the Y coil is wound are the same as those of the magnetic field detection unit.

The magnetic core is formed by laminating a ring core formed in a ring shape from a ribbon material in a single layer or in the same direction of the ribbon material by means for knowing the direction of the ribbon material of the ring core after forming the ring core. , Y coil are respectively provided on the magnetic core in the length direction of the ribbon.
It is characterized by being wound in a direction of 5 degrees.

The magnetic core is formed by laminating an even number of ring cores formed in a ring shape from a ribbon material in a direction 90 degrees to one direction of the ribbon material by means for knowing the direction of the ribbon material of the ring core after the ring core is formed. And the X
A coil and a Y coil are respectively wound around the magnetic core.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings. The arrangement structure of the ribbon direction of the magnetic core of the magnetic sensor of the present invention and the winding direction of the X coil and the Y coil with respect to the magnetic core will be described.

FIG. 1 shows a plan view and a sectional view of a first magnetic sensor of the present invention. The magnetic sensor 1 shown in the plan view of FIG. 1A and the sectional view taken along the line AA in FIG. 1B has a ring core 31a for forming the magnetic core 3 and a ring core substrate 3a carrying the ring core 31b. And the X coil 4
X coil pattern substrates 4a and 4b for forming
Y coil pattern substrate 5 for forming Y coil 5
a and 5b, a substrate 2 formed by laminating excitation coil pattern substrates 9a and 9b for forming excitation coils (not shown in the figure), the ring core 31a and the ring core 31
b, an X coil 4, a Y coil 5 wound around the magnetic core 3, and an exciting coil.

As shown in the plan view of FIG.
The magnetic core 3 includes the ring core 31a and the ring core 31b which are arranged in the same direction of the ribbon material 30 shown in FIG.
And the magnetic core 3
Is a direction in which the ribbon material 45 degrees direction 8 shown in FIG.
The coil 5 is arranged on the ring core substrate 3a so as to match the winding direction. Although the case where the number of the magnetic cores 3 is two has been described, the same applies to one to three or more ring cores.

Next, the operation of the first magnetic sensor 1 of the present invention will be described. As shown in FIG. 1A, the magnetic field detectors 3b and 3c related to the detection sensitivity of the X coil of the magnetic core 3 around which the X coil 4 is wound, and the Y coil of the magnetic core 3 around which the Y coil 5 is wound. Magnetic field detector 3d relating to the detection sensitivity of
3e is a 45-degree direction core part 8a, 8b, 8 shown in FIG.
c, 8d, and BH of the magnetic core 3 in the circumferential direction.
Since the curves are the same, the amplitudes VXm50a, VYm51a, offsets VX050b, and VY051b of the detection outputs VXm50a, VYm51a of the detection outputs VX50, VY51 of the X coil and the Y coil shown in Expressions 1 and 2 above have a phase shift θ.
X050c and θY051c can be matched. As a result, the number of correction parameters can be halved compared to the conventional magnetic sensor 40, and the amplitude of the detection output becomes the same, so that the circuit processing in the subsequent A / D conversion becomes easy.

FIG. 2 shows a plan view and a sectional view of a second magnetic sensor of the present invention. The magnetic sensor 10 shown in the plan view of FIG. 1A and the BB cross-sectional view in the plan view of FIG.
A ring core substrate 30a for supporting the ring core 31c and the ring core 31d for forming the magnetic core 30, and an X coil pattern substrate 4a for forming the X coil 4;
b, Y-coil pattern substrates 5a and 5b for forming the Y-coil 5, and excitation-coil pattern substrates 9a and 9b for forming the excitation coils (not shown), The magnetic core 30 includes the ring core 31c and the ring core 31d, the X coil 4, the Y coil 5, and the exciting coil wound around the magnetic core 30.

As shown in FIG. 2B, the magnetic core 30 includes a ring core 31c and a ring core 31d which are arranged in a ribbon material length direction 7 with respect to a ribbon material width direction 6 of the ribbon material 30 shown in FIG.
Are supported by the ring core substrate 30a. Although the case where the number of ring cores is two has been described, the same applies to an even number of four or more ring cores.

Next, the operation of the first magnetic sensor of the present invention will be described. As shown in FIG.
The magnetic field detectors 30b and 30c related to the detection sensitivity of the X coil of the magnetic core 30 around which the coil is wound and the magnetic field detector 3 related to the detection sensitivity of the Y coil of the magnetic core 3 around which the Y coil 5 is wound.
0d and 30e are the width direction core portions 6 shown in FIG.
a, 6b and the lengthwise core portions 7a, 7b, the BH curves are the same. Therefore, the detection output V of the X coil and the Y coil shown in the above-described equations (1) and (2) is obtained.
The amplitude VXm50 of the detection output at X50 and VY51
a, VYm51a, offset VX050b, VY0
51b can adjust the phase shifts θX050c and θY051c, respectively. As a result, the number of correction parameters can be reduced by half as compared with the conventional magnetic sensor 40, and the amplitude of the detection output becomes the same, thereby facilitating the A / D conversion circuit processing in the subsequent stage.

[0020]

As described above, there is an effect that the detection output from the magnetic sensor according to the present invention can be easily handled in a circuit.

[Brief description of the drawings]

FIG. 1 is a plan view and a sectional view of a first embodiment according to the present invention.

FIG. 2 is a plan view and a sectional view of a second embodiment according to the present invention.

FIG. 3 is a diagram illustrating a relationship between a ring core and a direction of a ribbon material.

FIG. 4 is an exploded view of a conventional magnetic sensor.

FIG. 5 is an angle change diagram of a detection voltage.

FIG. 6 is an explanatory diagram of a magnetic field component.

[Explanation of symbols]

 1, 10 Magnetic sensor of the present invention 40 Conventional magnetic sensor 31, 31a, 31b, 31c, 31d Ring core 3, 30, 44a Magnetic core 4 X coil 5 Y coil

Claims (3)

[Claims] 1. An X coil pattern, a Y coil pattern,
Each of substantially rectangular substrates having one of the exciting coil patterns is laminated with a substrate carrying a magnetic core as a nucleus, and an X coil formed by the X coil pattern, a Y coil formed by the Y coil pattern, In a magnetic sensor including an exciting coil formed by an exciting coil pattern, the magnetic sensor has a magnetic characteristic of a magnetic field detecting unit around which the X coil of the magnetic core is wound and a magnetic characteristic of a magnetic field detecting unit around which a Y coil is wound. A magnetic sensor characterized by being configured to have the same characteristics. 2. The magnetic core is formed by laminating a ring core formed in a ring shape from a ribbon material in a single layer or in the same direction of the ribbon material by means for knowing the direction of the ribbon material of the ring core after forming the ring core, 2. The magnetic sensor according to claim 1, wherein the X coil and the Y coil are respectively wound around the magnetic core in a 45 ° direction with respect to a width direction of the ribbon material. 3. 3. The magnetic core according to claim 1, wherein after forming the ring core, an even number of ring cores formed in a ring shape from the ribbon material by means for recognizing the direction of the ribbon material of the ring core are rotated by 90 degrees with respect to one direction of the ribbon material. The magnetic sensor according to claim 1, wherein the X coil and the Y coil are wound around the magnetic core, respectively.