JP2005241269A - Angle sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an angle sensor capable of highly accurate rotation angle detection with a simple configuration.
An angle sensor (1) includes a magnet (2) and a Hall IC (3) whose relative positions are changed by rotation of a rotating body to be detected, and a magnetic ring member arranged outside the magnet (2) with the Hall IC (3) interposed therebetween. A yoke 12 and a plate 13 that integrally supports the yoke 12 with respect to the magnet 2 are provided. The yoke 12 is supported by the plate 13 so that the distance from the magnet 2 cannot be changed.
[Selection] Figure 1

Description

  The present invention relates to an angle sensor.

  There is an angle sensor that includes a magnet and a Hall IC whose relative positions change relative to each other by rotation of a rotating body that is a detection target, and detects the rotation angle of the rotating body based on an output change (output potential change) of the Hall IC.

  However, in order to perform highly accurate rotation angle detection using such an angle sensor, it is an essential condition that the output waveform of the Hall IC has high reproducibility. Therefore, it is necessary to process the magnet and attach the magnet and the hall element with high precision so that the magnetic flux density passing through the hall IC changes stably according to the relative position change of the magnet and the hall IC. As a result, there is a problem that the manufacturing cost becomes high.

Conventionally, there is an angle sensor that solves the above-mentioned problems by providing a magnetic ring member outside the magnet and the Hall IC, and forming a magnetic circuit in the magnetic ring member to suppress the dispersion of the lines of magnetic force. With such a configuration, the magnetic flux distribution between the magnet and the Hall element can be stabilized without strictly managing the processing accuracy of the magnet and the mounting accuracy of the magnet and the Hall element. The passing magnetic flux density can be stably changed according to the rotation of the rotating body. As a result, highly accurate rotation angle detection can be performed without increasing the manufacturing cost (see Patent Document 1).
JP 2003-262537 A

  However, in the above conventional angle sensor, the gap between the magnet and the magnetic ring may fluctuate due to axial blurring of the rotating shaft, and in this case, the magnetic flux distribution between the magnet and the magnetic ring changes. As a result, the reproducibility of the output waveform of the Hall IC deteriorates and the rotation angle cannot be detected with high accuracy. Therefore, in order to detect the rotation angle with high accuracy, it is necessary to process the bearing and to assemble it with high accuracy in order to prevent rattling of the rotating shaft, which causes such shaft blurring. There is a problem that the manufacturing cost cannot be effectively suppressed.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide an angle sensor that enables highly accurate rotation angle detection with a simple configuration.

  In order to solve the above problems, the invention according to claim 1 includes a magnet and a Hall element whose relative positions change with the rotation of the rotating body, and the rotation angle of the rotating body is determined based on the output of the Hall element. An angle sensor to detect, comprising: a magnetic ring member disposed outside the magnet across the Hall element; and a support member that integrally supports the magnetic ring member with respect to the magnet; The gist is that the support member supports the gap with the magnet so as not to fluctuate.

The gist of the invention described in claim 2 is that the support member supports the relative position with respect to the magnet in an unchangeable manner.
The invention according to claim 3 includes a rotating shaft that rotates according to the rotation of the rotating body, the magnet is fixed to the rotating shaft, and the magnetic ring member is attached to the rotating shaft via the support member. The gist is fixed.

The gist of the invention described in claim 4 is that the Hall element is disposed closer to the magnetic ring member than an intermediate point between the magnet and the magnetic ring member.
The gist of the invention described in claim 5 is that the axial dimension of the magnetic ring member is set shorter than the axial dimension of the magnet.

The gist of the invention described in claim 6 is that a protrusion directed toward the magnet is formed on the inner peripheral surface of the magnetic ring member.
(Function)
According to the first aspect of the present invention, since the gap between the magnet and the magnetic ring member does not vary, the magnetic flux distribution between the magnet and the magnetic ring member is stabilized. Thereby, the magnetic flux density passing through the Hall element can be stably changed according to the rotation of the rotating body, and the output waveform of the Hall element can be stabilized and high reproducibility can be ensured. Therefore, it is possible to perform highly accurate rotation angle detection with a simple configuration without causing an increase in manufacturing cost.

  According to invention of Claim 2, the positional relationship of a magnet and a magnetic body ring member does not change relatively. As a result, the magnetic lines of force radiated from the magnet are always applied to the same part of the magnetic ring member, so even if the thickness of the magnetic ring member on which the magnetic circuit is formed is uneven, the magnet and the magnetic body The magnetic flux distribution with the ring member is stabilized. As a result, since it is not necessary to strictly manage the processing accuracy of the magnetic ring member, the manufacturing cost can be suppressed.

  According to the third aspect of the present invention, the positional relationship between the magnet and the magnetic ring member does not change relative to the rotation of the rotating shaft, and the interval varies even when shaft blurring occurs on the rotating shaft. do not do. That is, the magnetic ring member can be integrally supported with respect to the magnet with a simple configuration. And since it becomes unnecessary to manage strictly the processing accuracy and assembly of the bearing which supports a rotating shaft, and the processing accuracy of a magnetic body ring member, it becomes possible to control manufacturing cost.

  According to the fourth aspect of the present invention, the Hall element is disposed at a position where the change in magnetic field strength with respect to the distance from the magnet is small. Therefore, it is possible to further stabilize the output waveform and ensure its high reproducibility.

  According to the fifth and sixth aspects of the invention, the magnetic field change rate is further reduced in the region close to the magnetic ring member. Therefore, by arranging the Hall element in this region, the output waveform of the Hall element can be further stabilized, and as a result, extremely high reproducibility can be ensured.

  According to the present invention, it is possible to provide an angle sensor that enables highly accurate rotation angle detection with a simple configuration.

Hereinafter, an embodiment in which the present invention is embodied in an angle sensor will be described with reference to the drawings.
As shown in FIG. 1, the angle sensor 1 includes a magnet 2 and a Hall IC (Hall element) 3 whose relative positions are changed by the rotation of a rotating body that is a detection target. The rotation angle of the rotating body is detected by changing the output (output potential).

  More specifically, the angle sensor 1 includes a rotating shaft 5 that rotates according to the rotation of a rotating body that is a detection target, and the rotating shaft 5 is rotatably supported by bearings 6 and 7 in a case 8. Is housed inside. In the present embodiment, the magnet 2 rotates integrally with the rotating shaft 5 by being fixed to the peripheral surface of the rotating shaft 5.

  On the other hand, the Hall IC 3 is disposed outside the magnet 2 and is fixed to the case 8. The Hall IC 3 is connected to the connector 9 through a power supply wiring and a signal wiring (not shown). The Hall IC 3 is energized through the connector 9 and corresponds to the magnetic flux density passing through the Hall IC 3 and the direction of the magnetic flux. Outputs a potential signal. Accordingly, the relative position between the magnet 2 and the Hall IC 3 changes with the rotation of the rotary shaft 5, and the output of the Hall IC 3 changes as the magnetic flux density passing through the Hall IC 3 changes. Specifically, the output changes in a sine wave shape. And based on this output change, it becomes possible to detect the rotation angle (and rotation direction) of the rotating body which is a detection target.

  As shown in FIG. 2, the angle sensor 1 of the present embodiment rotates when the rotation angle of the rotary shaft 5 when the output (output potential) of the Hall IC 3 becomes zero is the reference angle θ0 (0 °). When the rotation angle of the shaft 5 is within a predetermined angle range (± θα) from the reference angle θ0, the rotation angle of the rotation shaft or the like (machine) is detected using the fact that the output of the Hall IC 3 changes almost linearly. Corner).

  Specifically, the angle sensor 1 of the present embodiment is configured to detect the rotation angle of a rotating body that is rotationally driven in a predetermined direction. More specifically, as shown in FIG. 1, a lever 10 connected to a rotating body to be detected is fixed to one end of the rotating shaft 5, and the rotating shaft 5 is connected to the rotating body by the lever 10. It rotates by being driven. The lever 10 (that is, the rotating shaft 5) is returned to the initial position by the elastic force of the return spring 11 when not driven.

  As shown in FIG. 2, the angle sensor according to the present embodiment has a rotation direction Y that is the direction in which the rotation shaft 5 rotates in accordance with the driving of the lever 10 (the counterclockwise direction in the figure). The effective range is an angle θ2 forming the predetermined angle θα in the opposite direction (clockwise direction in the figure) from the angle θ1 forming the predetermined angle θα in the rotation direction Y. And Hall IC3a is set so that it may be located in angle (theta) 1 when the lever 10 is not driven (when the rotation angle of a rotary body is 0 degree). Then, the rotation angle of the rotating body to be detected is detected based on the change in the output of the Hall IC 3a when the opposing position of the Hall IC 3a changes from the angle θ1 to the angle θ2 at the maximum by the rotation of the rotating shaft 5. It has become.

  In the angle sensor 1 of the present embodiment, the predetermined angle θα is set to 45 °. In addition, the Hall IC 3b is arranged at a point-symmetrical position with respect to the Hall IC 3a across the rotation shaft 5, and the Hall IC 3b outputs a signal whose absolute value is the same as that of the Hall IC output signal and whose sign is opposite. To do. That is, the Hall IC 3b outputs a signal having an output waveform whose phase is shifted by 180 ° with respect to the output waveform of the Hall IC 3a. Since the principle of rotation angle detection by the Hall IC 3b is the same as that of the Hall IC 3a, the description thereof is omitted.

  As shown in FIG. 1, the angle sensor 1 of the present embodiment includes a yoke 12 as a magnetic ring member that is formed in a ring shape from a magnetic body and is disposed outside the magnet 2 and the Hall IC 3.

  More specifically, a plate 13 as a support member formed of a nonmagnetic material is fixed to the rotating shaft 5, and the yoke 12 is fixed to the rotating shaft 5 via the plate 13. The yoke 12 is supported integrally with the magnet 2 at a predetermined interval from the magnet 2. That is, the yoke 12 constitutes the rotor 14 together with the magnet 2 and the rotating shaft 5, and rotates integrally with the magnet 2 as the rotating shaft 5 rotates. Therefore, even when shaft rotation occurs on the rotating shaft 5, the distance between the magnet 2 and the yoke 12 does not change, and the positional relationship does not change relatively.

  In the present embodiment, the plate 13 is formed in a disc shape, and the yoke 12 is disposed on the outer side of the magnet 2 with the Hall IC 3 interposed therebetween by being fixed to the outer edge portion of the plate 13. Specifically, the Hall IC 3 is set so as to be disposed outside the midpoint between the magnet 2 and the yoke 12 (position indicated by the straight line m1 in the figure). And the yoke 12 is extended along the axial direction of the rotating shaft 5 so that the inner peripheral surface may oppose the magnet 2.

Next, the operation of the angle sensor 1 of the present embodiment configured as described above will be described.
By providing a magnetic ring member outside the magnet 2 and the Hall IC 3, a magnetic circuit is formed in the magnetic ring member, and dispersion of lines of magnetic force is suppressed.

  As a result, as shown in FIG. 3, the magnetic field strength between the magnet 2 and the magnetic ring member, that is, the magnetic flux density passing through the Hall IC 3 is higher than that without the magnetic ring member indicated by the curve L2. The case where the magnetic body ring member indicated by the curve L1 is provided is stronger. Further, by providing the magnetic ring member, the change in the magnetic field strength in relation to the distance from the magnet 2 (note that the broken lines in the figure indicate the position of the magnet 2 and the position of the magnetic ring member). The ratio becomes smaller. For example, the change amount of the magnetic field strength in the range where the distance from the rotation center of the rotary shaft 5 (distance from the center line m0 shown in FIG. 1) is from the distance l1 to the distance l2 is improved from the change amount ΔT0 to the change amount ΔT1. The That is, even when the distance between the magnet 2 and the Hall IC 3 varies, the magnetic flux density passing through the Hall IC 3 does not change much.

  That is, the magnetic flux distribution can be stabilized without strictly managing the magnet processing accuracy and the magnet and Hall element mounting accuracy, and the magnetic flux density passing through the Hall IC 3 is stably changed according to the rotation of the rotating body. be able to. As a result, highly accurate rotation angle detection can be performed without increasing the manufacturing cost.

  However, the applicant of the present application is configured to fix the magnetic ring member to the case 8 side serving as a stator in a configuration in which the magnet 2 rotates integrally with the rotary shaft 5 as in the conventional angle sensor described in Patent Document 1. In such a case, it has been confirmed by experiments that the above effects cannot always be obtained.

  Specifically, in the conventional angle sensor that fixes the magnetic ring member on the stator side, the rotation (shaft) of the rotating shaft 5 causes the distance (distance) between the magnet 2 and the magnetic ring to vary. Therefore, as shown in FIG. 4, the magnetic field strength actually varies within the range indicated by the curve L1a and the curve L1b in the figure. Therefore, the maximum amount of change is the amount of change ΔT1 ′, which is hardly improved even when compared with the amount of change ΔT0 when no magnetic ring member is provided.

  In this respect, in the angle sensor 1 of the present embodiment, the yoke 12 as the magnetic ring member is fixed to the rotating shaft 5 via the plate 13, so that the yoke 12 and the magnet 2 constitute the rotor 14 integrally. Even when the shaft shake occurs on the rotating shaft 5, the distance between the magnet 2 and the yoke 12 does not vary, and the magnetic flux distribution between the magnet 2 and the yoke 12 is stabilized. Therefore, it is possible to stably change the magnetic flux density passing through the Hall IC 3 according to the rotation of the rotating body without strictly managing the processing accuracy and assembly of the bearings 6 and 7.

  In addition, the positional relationship between the magnet 2 and the yoke 12 does not change relative to the rotation of the rotating shaft 5. Therefore, the lines of magnetic force radiated from the magnet 2 are always applied to the same portion of the yoke 12 regardless of the rotation of the rotating shaft 5. Therefore, even if the thickness of the yoke 12 on which the magnetic circuit is formed is uneven, the magnetic field strength does not vary with the rotation of the rotating shaft 5, and the magnetic flux distribution between the magnet 2 and the yoke 12 is Stabilize. As a result, the magnetic flux density passing through the Hall IC 3 can be stably changed according to the rotation of the rotating body without strictly managing the processing accuracy of the yoke 12.

  Further, as shown in FIGS. 3 and 4, the amount of change in the magnetic field intensity becomes smaller as it approaches the yoke 12. In this respect, in the angle sensor 1 of the present embodiment, the Hall IC 3 is disposed outside the midpoint between the magnet 2 and the yoke 12. That is, the Hall IC 3 is arranged at a position where the change in magnetic field strength with respect to the distance from the magnet 2 is small. Therefore, it is possible to further stabilize the output waveform and ensure its high reproducibility.

As described above, according to the present embodiment, the following features can be obtained.
(1) The angle sensor 1 includes a magnet 2 and a Hall IC 3 whose relative positions are changed by rotation of a rotating body to be detected, and a yoke as a magnetic ring member disposed outside the magnet 2 with the Hall IC 3 interposed therebetween. 12 and a plate 13 that integrally supports the yoke 12 with respect to the magnet 2. The yoke 12 is supported by the plate 13 so that the distance from the magnet 2 cannot be changed.

  With such a configuration, the magnetic flux distribution between the magnet 2 and the yoke 12 is stabilized because the distance between the magnet 2 and the yoke 12 does not vary. Therefore, the magnetic flux density passing through the Hall IC 3 can be stably changed according to the rotation of the rotating body, and the output waveform of the Hall IC can be stabilized and high reproducibility can be ensured. As a result, highly accurate rotation angle detection can be performed with a simple configuration without increasing the manufacturing cost.

  (2) The yoke 12 is supported by the plate 13 such that its relative position with respect to the magnet 2 cannot be changed. With such a configuration, since the magnetic lines of force radiated from the magnet 2 are always applied to the same portion of the yoke 12, even if the thickness of the yoke 12 on which the magnetic circuit is formed is uneven, the magnet 2 And the magnetic flux distribution between the yoke 12 can be stabilized. As a result, since it is not necessary to strictly manage the processing accuracy of the yoke 12, the manufacturing cost can be suppressed.

  (3) The angle sensor 1 includes a rotating shaft 5 that rotates in accordance with the rotation of the rotating body, the magnet 2 is fixed to the peripheral surface of the rotating shaft 5, and the Hall IC 3 is disposed on the case 8 side that accommodates the rotating shaft 5. Fixed. The yoke 12 is fixed to the rotary shaft 5 via the plate 13.

  With this configuration, the yoke 12 can be supported integrally with the magnet 2 with a simple configuration, and the positional relationship between the magnet 2 and the yoke 12 does not change relative to the rotation of the rotating shaft 5. Even when the shaft shake occurs on the rotating shaft 5, the interval does not change. As a result, it is not necessary to strictly manage the processing accuracy and assembly of the bearings 6 and 7 that support the rotating shaft 5 and the processing accuracy of the yoke 12, and thus manufacturing costs can be reduced.

  (4) The Hall IC 3 is disposed outside the midpoint between the magnet 2 and the yoke 12. That is, the Hall IC 3 is arranged at a position where the change in magnetic field strength with respect to the distance from the magnet 2 is small. Therefore, the output waveform can be further stabilized and the high reproducibility can be ensured.

Next, a modified example of the yoke as the magnetic ring member will be described.
In the present embodiment, the axial lengths of the magnet 2 and the yoke 12 (axial dimensions, the length of the rotating shaft 5 in the axial thrust direction) are not particularly mentioned, but in FIGS. 5 (a) and 5 (b). As shown in the rotor 21, the axial length d 1 of the yoke 22 may be set shorter than the axial length d 0 of the magnet 2. Moreover, you may form the protrusion 33 which protrudes toward the direction of the magnet 2 on the internal peripheral surface 32a of the yoke 32 like the rotor 31 shown to Fig.6 (a) (b).

  In the rotor 21 shown in FIGS. 5A and 5B, the magnet 2 is disposed so that the axial center position of the magnet 2 and the axial center position of the yoke 22 coincide with each other. In the rotor 31 shown in FIGS. 6A and 6B, the protrusion 33 extends over the inner periphery of the yoke 32, and the position thereof is provided at the axial center position of the yoke 32.

Next, an operation when the shape of the yoke is changed as described above will be described.
FIGS. 7A and 7B are diagrams showing the configuration of the rotor 41 having the same axial lengths of the magnet 2 and the yoke 12 used for comparison in the following description. FIGS. These are figures which show the structure of the rotor 51 which does not have a magnetic body ring member similarly.

  As shown in FIG. 9, the relationship between the distance from the magnet 2 and the magnetic field strength of the rotor 21 (short yoke) and the rotor 31 (projection-provided yoke) of the modified example shown by the curves L3 and L4 is curved. Compared with the rotor 41 (equal-size yoke) shown in L1, the rotor 21 and the rotor 31 show substantially the same tendency.

  That is, in the region close to the magnet 2 (left side in the figure), the magnetic field strength is weaker than that of the rotor 41 shown by the curve L1, but becomes stronger as it approaches the yokes 22 and 32, and the region close to the yokes 22 and 32 (in the figure). On the right side, the magnetic field strength is stronger than that of the rotor 41. That is, by setting the axial length d1 of the yoke 22 to be shorter than the axial length d0 of the magnet 2, or by forming the protrusion 33 toward the magnet 2 on the inner peripheral surface 32a of the yoke 32, In relation to the distance from the magnet 2, the rate of change in the magnetic field strength can be reduced.

  When this is represented by the change rate of the magnetic field strength (magnetic field change rate), it is as shown in FIG. That is, by supporting the yoke 12 integrally with the magnet 2 as in the rotor 14 of the present embodiment, there is no magnetic ring member shown by the curve L2 or a conventional stator shown by the curve L1 ′. The characteristics of the magnetic field change rate can be greatly improved as compared with the magnetic ring member provided on the side.

  Specifically, the rotor 21 (short yoke) of the above-described modification shown by the curve L3, the rotor 31 (projection yoke) shown by the curve L4, and the rotor 41 (equal yoke) shown by the curve L1. In any case, the magnetic field fluctuation rate is about 1% or less in the region of about 3/5 or more of the distance between the magnet 2 and the yokes 12, 22, and 32 that are magnetic ring members. By arranging the Hall IC 3 in a region where the magnetic field fluctuation rate is approximately 1% or less, the output waveform can be further stabilized and extremely high reproducibility can be ensured.

  In particular, when the rotor 21 (short-size yoke) and the rotor 31 (yoke with protrusion) are used, the magnetic field variation rate is in the region close to the yokes 22 and 32 (right side in the figure). ) Is even smaller than when using. Therefore, by setting the axial length d1 of the yoke 22 to be shorter than the axial length d0 of the magnet 2, or by forming the protrusion 33 toward the magnet 2 on the inner peripheral surface 32a of the yoke 32, Furthermore, the output waveform of the Hall IC 3 can be stabilized to ensure extremely high reproducibility.

  Incidentally, the applicant of the present application is concerned with the factors that can obtain the above characteristics because, in the rotor 21, the magnetic lines of force are concentrated in the vicinity of the yoke 22 by setting the axial length d 1 of the yoke 22 to be short. In the rotor 31 (yoke with protrusion), it is considered that the magnetic lines of force concentrate on the protrusion 33.

In addition to the modified example of the yoke, the present embodiment may be modified as follows.
In the present embodiment, the rotor 14 is configured by the rotating shaft 5, the magnet 2, and the yoke 12. However, the Hall IC 3 may be provided on the rotor side, and the magnet 2 and the yoke 12 may be provided on the stator side.

  In the present embodiment, the rotary shaft 5 is provided to change the relative positions of the magnet 2 and the Hall IC 3 in accordance with the rotation of the rotary body that is the detection target. It is good also as a structure which provides a some column etc. That is, as long as the relative positions of the magnet 2 and the Hall IC 3 change according to the rotation of the rotating body, the rotating shaft 5 as a structure need not be provided.

In the present embodiment, the yoke 12 is supported by the disk-shaped plate 13, but may be configured to be supported by the support member in a spoke shape or other shapes.
The yoke 12 is configured to be supported integrally with the magnet 2 by being fixed to the plate 13. However, the present invention is not limited to this, and a support body 55 may be provided on the plate 13 and the yoke 57 may be fixed to the support body 55 as shown in FIG.

Further, as shown in FIG. 11B, a yoke 62 in which a slit 62a is formed may be used.
In the present embodiment, when the rotation angle of the rotation shaft 5 is within a predetermined angle range from the reference angle θ0, the rotation shaft to be detected by utilizing the fact that the output of the Hall IC 3 changes substantially linearly, etc. This is embodied in an angle sensor 1 for detecting the mechanical angle of the rotating body. However, the present invention is not limited to this. For example, the electrical angle of the motor 72 is detected by configuring the magnet 2 and the yoke 12 to rotate integrally with the rotating shaft 73 of the motor 72 as in the angle sensor 71 shown in FIG. It may be embodied in an angle sensor.

  In the angle sensor 71 shown in FIG. 12, one end of the rotation shaft 73 is pivotally supported by a bearing 76 provided in the case 74 of the angle sensor 71, but the magnet 2 and the yoke 12 are not necessarily fixed. For example, the plate 13 may be fastened to one end of the rotating shaft 73.

Sectional drawing of the angle sensor of this embodiment. AA sectional drawing of the angle sensor of this embodiment. The graph which shows the relationship between the distance from a magnet and magnetic field intensity between a magnet and a magnetic body ring member (yoke). The graph which shows the relationship between the distance from a magnet and magnetic field intensity between a magnet and a magnetic body ring member (yoke). (A) (b) The figure which shows the structure of the rotor of a modification. (A) (b) The figure which shows the structure of the rotor of a modification. (A) (b) The figure which shows the structure of the rotor for a comparison. (A) (b) The figure which shows the structure of the rotor for a comparison. The graph which shows the relationship between the distance from a magnet and magnetic field intensity between a magnet and a yoke (magnetic body ring member). The graph which shows the relationship between the distance from a magnet between a magnet and a yoke, and a magnetic field fluctuation rate. (A) (b) The figure which shows the structure of the yoke of another example. The schematic block diagram of the angle sensor of another example.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1,71 ... Angle sensor, 2 ... Magnet, 3 (3a, 3b) ... Hall IC, 5,73 ... Rotary shaft, 12, 22, 32, 57, 62 ... Yoke, 13 ... Plate, 32a ... Inner peripheral surface, 33: Projection, 55: Support, d0: Length in the axial direction of the magnet, d1: Length in the axial direction of the yoke.

Claims (6)

An angle sensor that includes a magnet and a Hall element whose relative position is changed by rotation of the rotating body, and detects a rotation angle of the rotating body based on an output of the Hall element,
A magnetic ring member disposed on the outside of the magnet with the Hall element interposed therebetween;
A support member that integrally supports the magnetic ring member with respect to the magnet;
The support member supports the gap with the magnet so as not to fluctuate;
An angle sensor characterized by. The angle sensor according to claim 1.
The supporting member supports the relative position with respect to the magnet in an unchangeable manner;
An angle sensor characterized by. The angle sensor according to claim 1 or 2,
A rotating shaft that rotates according to the rotation of the rotating body;
The angle sensor, wherein the magnet is fixed to the rotating shaft, and the magnetic ring member is fixed to the rotating shaft via the support member. In the angle sensor as described in any one of Claims 1-3,
The Hall element is disposed on the magnetic ring member side of an intermediate point between the magnet and the magnetic ring member. In the angle sensor as described in any one of Claims 1-4,
An angle sensor characterized in that an axial dimension of the magnetic ring member is set shorter than an axial dimension of the magnet. In the angle sensor as described in any one of Claims 1-5,
Protrusions toward the magnet direction are formed on the inner peripheral surface of the magnetic ring member,
An angle sensor characterized by.

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