JPH07260511A - Magnetic type rotation position detector - Google Patents

Abstract

PURPOSE:To facilitate detection phase adjustment of a Hall element by providing a plurality of positioning protrusions, fastening one of plural base boards with a fixed posture to a housing cylinder part, and enabling the other base boards to displace angularly with the rest of positioning protrusions as fulcrums. CONSTITUTION:A base board 221 wherein a positioning protrusion 32, is fitted into a fitting hole 40 is fixed to an instrument body 21 with a fixed posture to a housing cylinder part 24 by means of a screw member 41 screw engaged with a screw hole 34 of a support boss 33.. Members 41 of other base boards 222, 223 are temporarily fastened, one side of a driver 47 is locked to one of locking grooves 44-46, and the driver 47 is oscillatingly operated with the side of grooves 44-46 as a fulcrum, so that the base boards 222, 223 can be easily angularly displaced by a minute angle around the positioning protrusions 322, 323. Moreover, since the grooves 44-46 are provided at a fine interval in the peripheral direction of side wall parts 27 of the grooves 44-46, adjustment of minute angular displacement of the base boards 222, 223 within a range of possible angular displacement around the protrusions 322, 323 can be realized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic rotary position detector in which a plurality of Hall elements are arranged around a magnet rotor with a predetermined angle between them.

[0002]

2. Description of the Related Art Heretofore, a magnetic rotary position detector, in which the distance between the magnet rotor and the Hall element can be adjusted and the position of the Hall element along the circumferential direction of the magnet rotor, that is, the detection phase, can be adjusted, is known, It is already known in Japanese Utility Model Publication No. 60-154862.

[0003]

However, in the above-mentioned prior art, the position adjustment of the Hall elements along the circumferential direction of the magnet rotor is performed independently, and if one is adjusted and then the other is adjusted. The adjustment may not be easy because there may be a gap between the adjusted intervals or the detected phase.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a magnetic rotary position detector capable of easily adjusting the detection phase of the Hall element.

[0005]

In order to achieve the above-mentioned object, the invention according to claim 1 is a magnetic type rotating device in which a plurality of Hall elements are arranged around a magnet rotor with a predetermined angle between them. In the position detector, a body basically made of synthetic resin has a housing cylinder portion having a circular cross section for housing the magnet rotor, and a plurality of positioning members having an axis parallel to the axis of the housing cylinder portion. One of a plurality of substrates each having a protrusion and a Hall element,
With one of the positioning protrusions fitted, the posture with respect to the storage cylinder is determined and fastened to the body, and another board into which the remaining positioning protrusion is fitted is provided with an insertion hole. The other substrate after the adjustment of the angle around the positioning protrusion is completed in a temporarily tightened state of the screw member loosely inserted into the body and screwed to the body, is fastened to the body by the screw member. To do.

According to a second aspect of the present invention, in addition to the configuration of the first aspect of the present invention, the other substrate is provided with an angle adjusting groove that is open to the outside, and a play is formed in the insertion hole. In order to perform an angular displacement operation of the other substrate around the positioning protrusion by locking the other side of the angle adjusting tool, one side of which is engaged with the angle adjusting groove in a temporarily tightened state of the inserted screw member. A plurality of locking grooves are provided in the body at intervals along the circumferential direction centering on the axis of the storage cylinder.

Further, according to the invention of claim 3, in addition to the structure of the invention of claim 1 or 2, at least a part of the side wall along the circumferential direction of the accommodating tubular portion is formed of a non-magnetic plate, Inside the resin-filled portion formed by the potting of synthetic resin into the body, each board having a Hall element elastically contacted to the outer surface of the non-magnetic plate by the elastic means and fastened to the body Be buried in.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a three-phase brushless motor will be described below with reference to the drawings.

1 to 7 show an embodiment of the present invention. FIG. 1 is a vertical sectional view of a magnetic rotary position detector mounted on a three-phase brushless motor.
1 is a cross-sectional view corresponding to line 1, FIG. 2 is a plan view of the body, FIG. 3 is a cross-sectional view taken along line 3-3 of FIG. 2, FIG. 4 is a plan view with each board attached to the body, and FIG. 5 is a sectional view taken along line 5-5 of FIG. 4, FIG. 6 is an exploded perspective view of the substrate, the holder, and the Hall element, and FIG. 7 is a sectional view corresponding to FIG. 5 in a state where a resin-filled portion is formed inside the body.

First, in FIG. 1, a motor shaft 13 is provided on one side of a casing 12 of a three-phase brushless motor 11.
One end of which is rotatably supported via a bearing 14,
At one end of the motor shaft 13, a magnet rotor 16 having a plurality of permanent magnets 15 ...
Coaxially connected so as to project from 2. That is, the opposite end portions of the motor shaft 13 and the magnet rotor 16 have teeth 13 which mesh with each other so as to match the phases of the motor shaft 13 and the magnet rotor 16.
a, 16a are provided, and their tooth portions 13a, 1
6a are engaged with each other, the motor shaft 13
The magnet rotor 16 and the magnet rotor 16 are connected by a connecting bolt 17.

A plurality of magnetic rotational position detectors 18 are fixed to one side of the casing 12 so as to cover the magnet rotor 16 by a plurality of, for example, a pair of bolts 19 ... It is covered by a cover 20 which is joined to one side.

The magnetic rotary position detector 18 includes a body 21 which is basically made of a synthetic resin, and three substrates which are fixed to the body 21 around the magnet rotor 16 with an interval of 120 degrees therebetween. 22 ₁ , 22 ₂ and 22 ₃ and the Hall elements 23 arranged on the substrates 22 _{1 to} 22 ₃ , respectively.
₁ , 23 ₂ , 23 ₃ .

2 and 3, the body 21 is formed in a circular cross section to accommodate the magnet rotor 16 protruding from the casing 12 of the three-phase brushless motor 11, and has a circular closing plate 24a at one axial end. A bottomed cylindrical storage cylinder portion 24 having a bottom and a fitting cylinder coaxially surrounding the storage cylinder portion 24 so as to be fitted into a fitting recess 12a (see FIG. 1) provided on one side of the casing 12. Part 25,
An abutting plate portion 26 that extends outward in the radial direction from the fitting tubular portion 25 so as to come into contact with the outer surface on one side of the casing 12, and a storage concave portion 28 in the body 21 on the side opposite to the casing 12. The side wall portion 27 is provided continuously with the contact plate portion 26 in this manner.

Between the storage cylinder portion 24 and the fitting cylinder portion 25,
An open storage groove 29 is formed on the storage recess 28 side. The storage groove 29 is formed in an arc shape so as to store the _three Hall elements 23 ₁ to 23 3 arranged at intervals of 120 degrees from each other. The connecting portion 3 is provided between the storage tubular portion 24 and the fitting tubular portion 25 at both ends.
Connected with 0. Thus, the connecting portion 30 and the closing plate 24a of the storage cylinder portion 24 are integrally connected to each other when the container body 21 is formed of synthetic resin.

A portion of the side wall of the storage cylinder portion 24 corresponding to the storage groove 29 is formed by, for example, a nonmagnetic plate 31 formed by processing a stainless steel plate into an arcuate cross section. , Both ends in the circumferential direction are embedded in the connecting portion 30, and one end in the axial direction is the closing plate 24a.
And is integrated with the container body 21 when the container body 21 is molded with a synthetic resin.

The closing plate 24a of the storage cylinder 24 has
Three positioning protrusions 32 ₁ , 32 ₂ , 32 ₃ having an axis parallel to the axis of the storage cylinder 24 are provided in a protruding manner. Thus, the positioning protrusion 32 ₁ is provided on the closing plate 24a at a position on the opposite side of the connecting portion 30 with respect to the axis of the storage tubular portion 24,
The remaining positioning protrusions 32 ₂ and 32 ₃ are provided on the closing plate 24a at positions spaced by 120 degrees from the positioning protrusion 32 ₁ .

_On the outer side of each of the positioning projections 32 _{1 to} 323 along the radial direction of the storage cylinder 24, the inner surface of the side wall 27 is brought into contact with the closing plate 24a of the storage cylinder 24 to the same level as the contact plate. Support boss 3 so as to rise from 26
3 ₁ , 33 ₂ , 33 ₃ are provided, and each support boss 3
3 _to 333 in ₃ of the bottomed screw hole 34 ... are respectively provided.

Between the support bosses 33 ₁ and 33 _{2 and} between the support bosses 33 ₁ and 33 ₃ , the side wall portion 27 is provided with recesses 36 and 36 having a trapezoidal cross section and recessed inward. Metallic collars 37, 37 formed in an arc shape centering on the axis of the storage cylinder 24 are integrated with the abutting plate portion 26 of the body 21 so as to be positioned in the recesses 36, 36. Embedded in. Bolts 19 (see FIG. 1) are inserted into these collars 37, 37 when the magnetic rotary position detector 18 is coupled to the casing 12, and both ends are integrally formed with the side wall portion 27. The heads 19a of the bolts 19 are surrounded by the protection walls 38, 38 that are continuously provided.

With respect to the axis of the storage cylinder portion 24, the support boss 33
_A cord outlet 39 is provided on the side wall 27 on the side opposite to the side ₁ .

In FIGS. 4 and 5, three substrates 22 are provided.
₁ , 22 ₂ and 22 ₃ are closing plates 24 a of the storage cylinder 24.
When, in which is disposed over between the support boss 33 _to 333 which correspond to the respective substrates 22 ₁ to 22 _3. Thus, the substrate 22 ₁ is formed in a shape different from that of the other substrates 22 ₂ and 22 ₃ by disposing a protection circuit (not shown).

[0021] The substrate 22 _1, a fitting hole 40 is provided to fit the positioning projection 32 _1, the substrate is in a state fitted to the positioning projections 32 ₁ into the fitting hole 40 22
_{The reference} numeral ₁ designates a posture with respect to the storage cylinder portion 24 by means of a screw member 41 which is screwed into the screw hole 34 of the support boss 33 _1.
It is fixed at 1.

Further, the other substrates 22 ₂ and 22 ₃ are provided with fitting holes 40 and 40 into which the positioning protrusions 32 ₂ and 32 ₃ are fitted, and the positioning protrusions 32 ₂ and 3 3 are also provided.
Inserted are formed of two ₃ in an arc shape around the hole 42, 42
Is provided corresponding to the screw holes 34, 34 of the support bosses 33 ₂ , 33 ₃ , and is loosely inserted into the insertion holes 42, 42.
1, 41 are screwed into the screw holes 34, 34. Then, in the temporarily tightened state where the screw members 41, 41 are lightly tightened, the substrate 2
2 ₂ and 22 ₃ are screw members 41 and 41 around the positioning protrusions 32 ₂ and 32 ₃ at both longitudinal ends of the insertion holes 42 and 42.
It is possible to make angular displacement in the range where the abutting contacts.

[0023] In order to angular displacement operating the substrate 22 _2, 22 _3, the side corresponding to the side wall portion 27 of the substrate 22 _2, 23 _3, the angle adjusting groove 43 which is open to the outer side i.e. the side wall portion 27 side , 43 are provided. On the other hand, each angle adjustment groove 4
On the inner surface of the side wall portion 27 at a portion corresponding to 3, 43, a plurality of, for example, three locking grooves 44, 45, 46 spaced at minute intervals along the circumferential direction centering on the axis of the storage tubular portion 24.
Are provided respectively. When performing the angular displacement operation of the substrates 22 ₂ and 22 ₃ with the screw members 41 and 41 temporarily tightened, one side of the angle adjusting tool such as a minus type screwdriver 47 is engaged with the angle adjusting groove 43. The other side of the driver 47 may be locked to the selected one of the locking grooves 44 to 46, and the driver 47 may be swung about the locking grooves 44 to 46 as a fulcrum. By doing so, the substrate 22 ₂ , around the positioning protrusions 32 ₂ , 32 ₃
22 ₃ can be easily angularly displaced by a minute angle. Moreover, since the locking grooves 44 to 46 are provided in the side wall portion 27 at a minute interval in the circumferential direction thereof, the substrate 22
_It is possible to adjust the minute angular displacement within a range in which the ₂ , 22 ₃ can be angularly displaced around the positioning protrusions 32 ₂ , 32 ₃ .

Referring also to FIG. 6, each substrate 22₁, 2
Two₂, 22₃The holders 48 made of synthetic resin are
Attached. These holders 48 have a substantially L-shaped vertical cross section.
Is provided on the holder 48 ...
The pair of fitting protrusions 48a and 48a are provided on the substrate 22.₁~ 22
₃The holders 48 ... ₁
~ 22₃Mounted on. Thus, each hall element 23₁~
23₃Avoids damage when handled by itself
Are fitted and held in the holders 48 ...
Each of the holders 48 stored in the storage groove 29 ...
In addition, it enables the non-magnetic plate 31 to move toward and away from the outer surface.
Retained. Each holder 48 ... And each hole element
Child 23₁~ 23₃Along the radial direction of the storage cylinder 24
Each positioning protrusion 32₁~ 32₃That is, each fitting hole 40 ...
Positioning protrusion 32 on a straight line passing through₁~ 32₃And each
Positioning protrusion 32 between the screw members 41 ...₁~ 32₃On the side
Are arranged, and each substrate 22₁~ 22₃From 3
The metal connection terminals 49 ...
Three₁~ 23₃Respectively connected to. Then each connection terminal
49 ... Respective hall elements 23₁~ 23₃The non-magnetic plate 31
Which constitutes an elastic means for elastically contacting the outer surface of the
It is formed by bending so as to exert elastic force.

A cord bundle 50 composed of a plurality of cords connected to each of the substrates 22 _{1 to} 22 ₃ is a side wall portion 27 of the body 21.
Grommet 5 fitted in the cord outlet 39 in
1 is drawn into the body 21.

The substrate 22 ₂ Utsuwatai 21 after the angle adjustment completion for the substrate 22 ₁ together with the substrate 22 ₁ in the device body 21 at a predetermined position is fastened, 22 ₃ are connected to each other, the holder 48 ...
In the state where the Hall elements 23 ₁ , 23 ₂ , 23 ₃ held by the above are elastically abutted on the non-magnetic plate 31 of the storage cylinder portion 24, the storage recess 28 and the storage groove 29 of the container 21 are Figure 7
As shown, the synthetic resin by being filled with the resin filler 52 formed by potting, thereby the Hall elements 23 ₁ to 23 ₃ each substrate 22 _{1-22 3} having,
In addition, the cords and the like connected to the substrates 22 _{1 to} 22 ₃ are embedded in the resin filling portion 52, whereby the magnetic rotary position detector 18 is completed.

Next, the operation of this embodiment will be described. The Hall element 23 arranged on each of the substrates 22 _{1 to} 22 _{3.
Since 1} to 23 ₃ are elastically abutted on the outer surface of the non-magnetic plate 31 forming part of the side wall of the storage cylinder portion 24 that stores the magnet rotor 16, the storage cylinder portion 24 with respect to the magnet rotor 16 is accommodated. Enhancing the concentricity of the body 21 to the casing 1
2, the magnet rotor 16 and the Hall elements 23 ₁ to 23 ₃ can be kept at a constant distance at all times.
_It is not necessary to adjust the interval between _{1 and} 23 ₃ . Moreover, when the non-magnetic plate 31 is made of a stainless steel plate, it has sufficient strength even if it is made thin, so that the Hall elements 23 ₁ to 23 ₃ are attached to the thin non-magnetic plate 31. by contact, it is possible to relatively small constant value the distance between the magnet rotor 16 and the Hall elements 23 ₁ to 23 _3, the Hall elements 23 ₁ to 23 ₃
It is possible to prevent the Gaussian amount from decreasing.

Also, one of the three substrates 22 _{1 to} 22 ₃
One of the substrates 22 ₁ is fastened to the body 21 in a posture with respect to the storage cylinder 24, and the other substrates 22 ₂ and 23 ₂ are fulcrumed by positioning projections 32 ₂ and 32 ₃ parallel to the axis of the storage cylinder 24. Since it is possible to make angular displacement, the screw members 41, 4
In step 1, the substrates 22 ₂ and 22 ₃ are temporarily fastened to the body 21, and the phase difference of the signals obtained from the Hall elements 23 ₁ to 23 ₃ is detected, so that the phase difference is within the allowable range.
It is easy to adjust the phase difference by operating ₂ and 22 ₃ angularly. At this time, the Hall elements 23 ₁ to 23 ₃ remain in contact with the non-magnetic plate 31, and the magnet rotor 16 and The distance between the Hall elements 23 ₁ to 23 ₃ remains constant.

[0029] Moreover in correspondence with the angle adjustment groove 43 provided respectively on the substrate 22 _2, 23 _2, the side wall portion 2 of the device body 21
7, the engaging grooves 44, 45, 46 are provided with a small gap therebetween, so that one side of the driver 47 is engaged with the angle adjusting groove 43 and the engaging grooves 44 to 46 are provided.
By locking the other side of the driver 47 to the selected one of them and swinging the driver 47 with the locking grooves 44 to 46 as a fulcrum, the substrates 22 ₂ and 22 ₃ are angled by a minute angle. It is easy to displace, and the fine adjustment of the phase difference can be easily performed. Hall element 23
₂ and 23 ₃ are located on the straight line passing through the positioning protrusions 32 ₂ and 32 ₃ along the radial direction of the storage tubular portion 24, and the positioning protrusion 3
2 ₂ and 32 ₃ and the screw members 41 are arranged closer to the positioning protrusions 32 ₂ and 32 _3, so that the driver 4
When the angular displacement is finely adjusted by 7, the amount of movement of the Hall elements 23 ₂ and 23 ₃ along the circumferential direction of the accommodating tubular portion 24 is made minute, and the adjustment accuracy of the phase difference can be further improved.

Each substrate 22₁~ 22₃And Hall element
Child 23₁~ 23₃Etc. are buried in the resin filling portion 52.
Each substrate 22₁~ 22₃Circuit protection
Hall element 23 after phase difference adjustment₁~
23₃The position of can be fixed. Moreover, synthetic tree
When the resin filling portion 52 is formed by potting oil,
The magnetic plate 31 functions as a mold that prevents the outflow of synthetic resin.
Also fulfill. Further, when forming the resin filling portion 52, each ho
Element 23₁~ 23₃Elastically abuts the non-magnetic plate 31
Therefore, each hole element is
Child 23₁~ 23 ₃The position of does not shift.

Further, the bolts 19 for fastening the body 21 to the casing 12 of the brushless motor 11 are attached to the collars 37, 37 embedded in the body 21 in the shape of an arc centered on the axis of the storage cylinder 24. Since it is inserted, the phase of the body 21 with respect to the magnet rotor 16 can be adjusted within a certain range.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the claims. It is possible to do.

For example, instead of forming the insertion hole 42 in an arc shape, the substrate 2 around the positioning protrusions 32 ₂ and 32 ₃ is formed.
It is also possible to form a fool hole that allows the angular displacement of 2 ₂ and 22 ₃ and also to use the connection terminal 49 to connect the hall element 23.
_{1-23 3} instead for resiliently urging the, be adapted to abut the Hall element 23 ₁ to 23 ₃ nonmagnetic plate 31 resiliently manner be a dedicated elastic means comprising a spring member it can.
Further, the non-magnetic plate may be divided into a plurality of pieces in the circumferential direction, and the Hall element may not be held by the holder.

[0034]

As described above, according to the first aspect of the present invention, one of the substrates is fastened to the container while determining the posture with respect to the storage cylinder, and the other substrate is connected to the axis of the storage recess. Since angular displacement is possible with parallel positioning protrusions as fulcrums,
It is easy to perform an angular displacement operation on the other substrate so as to adjust the phase difference of the signals obtained by each Hall element to be within the allowable range.

According to the second aspect of the invention, the container body is provided with the angle adjusting grooves respectively provided on the substrate.
Since a plurality of locking grooves are provided at intervals between each other,
By engaging and operating both sides of the angle adjusting tool with one of the angle adjusting groove and each of the locking grooves, it is possible to easily angularly displace the other substrate by a minute angle, and finely adjust the phase difference. Can be done easily.

Further, according to the third aspect of the present invention, since the Hall element is elastically abutted on the outer surface of the non-magnetic plate forming a part of the side wall of the accommodating cylinder portion, the magnet rotor and each of the Hall elements. The distance between the elements can be kept constant at all times, and the adjustment of the distance between the magnet rotor and each Hall element can be eliminated, and the thickness of the non-magnetic plate can be reduced to reduce the gap between the magnet rotor and each Hall element. Can be set to a relatively small constant value, and a reduction in the Gaussian amount for the Hall element can be prevented. Moreover, since each substrate, Hall element, etc. are buried in the resin-filled portion by potting of synthetic resin,
The circuit of each board can be protected, the position of the Hall element after phase difference adjustment can be fixed, and because the Hall element is elastically abutted on the non-magnetic plate, it is possible during the potting. The position of the Hall element does not shift.

[Brief description of drawings]

1 is a vertical cross-sectional view of a magnetic rotary position detector attached to a three-phase brushless motor and is a cross-sectional view corresponding to line 1-1 in FIG. 4;

FIG. 2 is a plan view of a container.

FIG. 3 is a sectional view taken along line 3-3 of FIG.

FIG. 4 is a plan view showing a state where each substrate is attached to a body.

5 is a sectional view taken along line 5-5 of FIG.

FIG. 6 is an exploded perspective view of a substrate, a holder and a Hall element.

FIG. 7 is a cross-sectional view corresponding to FIG. 5 in a state where a resin-filled portion is formed inside the body.

[Explanation of symbols]

16 ... Magnet rotor 18 ... Magnetic rotational position detector 21 ... Body 22 ₁ , 22 ₂ , 22 ₃ ... Substrate 23 ₁ , 23 ₂ , 23 ₃ ... Hall element 24 ...・ Storing cylinder part 31 ... Non-magnetic plate 32 ₁ , 32 ₂ , 32 ₃ ... Positioning protrusion 41 ... Screw member 42 ... Insertion hole 43 ... Angle adjustment groove 44, 45, 46 ... -Locking groove 47 ... Driver as an angle adjusting tool 49 ... Connecting terminal 52 as elastic means 52 ... Resin-filled portion

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kunio Yahagi Kunio Yahagi 1-4-1 Chuo Wako, Saitama Prefecture Honda R & D Co., Ltd. (72) Inventor Masashi Igarashi 1-1-4 Chuo, Wako, Saitama Incorporated Honda Technical Research Institute (72) Inventor Yoshihiro Nakazawa 1-4-1 Chuo, Wako City, Saitama Incorporated Honda Technical Research Institute

Claims (3)

[Claims] 1. A magnet rotor (16) in which a plurality of Hall elements (23 ₁ to 23 ₃ ) are arranged at a predetermined angle between each other.
In the magnetic type rotational position detector arranged around the housing, the housing body (21) basically made of synthetic resin has a storage cylinder portion (24) formed in a circular cross section for storing the magnet rotor (16). a) a plurality of positioning projections and _{(321 to} 323) is provided with an axis parallel to the axis of the housing tube portion (24), a plurality having hall elements (23 _1, 23 _2, 23 ₃₎ respectively Substrate (22 ₁ , 22 ₂ , 22 ₃ )
One of the (22 _1), said positioning projection (32 ₁
~ 32 ₃ ) one of the (32 ₁ ) is fitted and fixed to the container body (21) with a posture with respect to the storage cylinder part (24), and the remaining positioning protrusions (32 ₂ , 32 ₃ ). Inserting holes (42) in the other boards (22 ₂ , 22 ₃ ) into which
Is provided, and the body (2
The other substrate (22 ₂ , 22 ₃ ) after the angle adjustment around the positioning protrusions (32 ₂ , 32 ₃ ) is completed in the temporarily tightened state of the screw member (41) screwed to 1) is the screw. A magnetic rotary position detector characterized by being fastened to a body (21) by a member (41). 2. The other substrate (22 ₂ , 23 ₂ ) is provided with an angle adjusting groove (43) which is open to the outside so that the screw member (41) loosely inserted into the insertion hole (42). In the temporarily tightened state, the other side of the angle adjusting tool (47) having one side engaged with the angle adjusting groove (43) is locked and the positioning protrusion (3) is engaged.
The other substrate (22 ₂ , 2 ₃ ) around 2 ₂ , 32 ₃ )
2 ₃ ) A plurality of locking grooves (4
The magnetic body (21) according to claim 1, characterized in that (4, 45, 46) are provided on the body (21) at intervals along a circumferential direction centered on the axis of the housing cylinder (24). Rotary position detector. 3. The non-magnetic plate (31) is formed on at least a part of the side wall of the housing tube portion (24) in the circumferential direction, and the elastic means (49) repels the outer surface of the non-magnetic plate (31). Substrates (22 _{1 to} 22) fastened to the body (21) with Hall elements (23 ₁ to 23 ₃ ) that are abutted against each other
The magnetic rotary position detector according to claim 1 or 2, wherein ( ₃ ) is embedded in a resin filling portion (52) formed by potting a synthetic resin into the body (21).