CN209263897U - Magnet arrangement body, rotation angle detector and electric power steering device - Google Patents
Magnet arrangement body, rotation angle detector and electric power steering device Download PDFInfo
- Publication number
- CN209263897U CN209263897U CN201821834725.0U CN201821834725U CN209263897U CN 209263897 U CN209263897 U CN 209263897U CN 201821834725 U CN201821834725 U CN 201821834725U CN 209263897 U CN209263897 U CN 209263897U
- Authority
- CN
- China
- Prior art keywords
- formed body
- axis
- magnet arrangement
- magnet
- magnet formed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Transmission And Conversion Of Sensor Element Output (AREA)
- Power Steering Mechanism (AREA)
- Brushless Motors (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
The utility model relates to magnet arrangement body, rotation angle detector and electric power steering devices.A kind of magnet arrangement body, has: binding magnet formed body, the shape with plate, and has the through hole extended along thickness direction；And axis, the end face of the second end with the first end and the rotary shaft that should be installed on arranged coaxial chimeric with the through hole of binding magnet formed body, the first end of axis are exposed from binding magnet formed body.Therefore, by magnet arrangement body to second end side press and by the rotary shaft of electric motor be pressed into the second end when, the end face of the first end of exposing can be pressed.That is, pressure can not be applied to binding magnet formed body and be pressed into.Therefore, the breakage or deformation of binding magnet formed body when indentation are suppressed, and the variation due to their magnetic characteristic is intentionally inhibited, it is thus achieved that the stabilisation of magnetic characteristic.
Description
Technical field
The utility model relates to magnet arrangement body, rotation angle detector and electric power steering device (ELECTRIC
POWER STEERING DEVICE)。
Background technique
In recent years, opening using the technology of the rotation angle of the electric motor of Magnetic Sensor detection electric power steering device
Hair is carrying out.For example, disclosing and being installed on electric motor in International Publication No. 2015/140961 (patent document 1)
The sensor-magnet of the sensor-magnet assembly of rotary shaft approaches and is oppositely disposed the court for detecting the magnetic field of the sensor-magnet
To rotation sensor and detect the technology of the rotation angle of the rotary shaft of electric motor.In addition it shows, in the rotation of electric motor
When sensor-magnet assembly is installed on axis, applies along axial pressure is rotated, rotary shaft is pressed into sensor-magnet
Assembly.
Utility model content
It is above-mentioned in the prior art, by rotary shaft be pressed into sensor-magnet assembly when, need relative to sensor
Magnet applies pressure.If applying pressure to sensor-magnet, the breakage or deformation of sensor-magnet, the situation may cause
Under, magnetic characteristic may change.
Utility model people further investigation, as a result new discovery can inhibit the same of the pressure relative to sensor-magnet
When, by the technology of rotary shaft indentation sensor-magnet assembly.
According to the utility model, provide a kind of magnet arrangement body with stable magnetic characteristic, rotation angle detector and
Electric power steering device.
Magnet arrangement body involved in one mode of the utility model, has: binding magnet formed body, with plate
Shape, and there is the through hole that extends along thickness direction；Axis has chimeric with the through hole of binding magnet formed body
The end face of the second end of first end and the rotary shaft that should be installed on arranged coaxial, the first end of axis is formed from binding magnet
Body exposes.
In above-mentioned magnet arrangement body, because the end face of the first end of axis is exposed from binding magnet formed body, lead to
The end face for the first end that pressing is exposed is crossed, rotary shaft can be pressed into the second end of axis.That is, can not to binding magnet at
Type body applies pressure and is pressed into, and magnetic caused by intentionally inhibiting the breakage of binding magnet formed body when indentation or deforming is special
Therefore the variation of property realizes the stabilisation of magnetic characteristic.
In the magnet arrangement body involved in other way, binding magnet formed body has the through hole of circular cross-section, and
And the first end of axis has columned shape, is provided with the inner peripheral surface and first end of the through hole of binding magnet formed body
Outer peripheral surface engaging holding section.In this case, can inhibit relative to the through hole in first end and binding magnet formed body
The state of affairs that chimeric axis generates the state of affairs of the opposite positional shift of binding magnet formed body or binding magnet formed body is detached from.
In the magnet arrangement body involved in other way, holding section include be set to first end outer peripheral surface it is recessed
Portion, binding magnet formed body enter recess portion.In this case, entering the periphery for being set to first end by binding magnet formed body
The recess portion in face, the outer peripheral surface engaging of the inner peripheral surface and first end of the through hole of binding magnet formed body.
In the magnet arrangement body involved in other way, holding section includes multiple recess portions, in the outer peripheral surface of first end,
Circumferentially it is arranged with multiple recess portions.In this case, the circumferential opposite position especially with regard to binding magnet formed body is inclined
It moves and is suppressed.
In the magnet arrangement body involved in other way, multiple recess portions are with the central axis of the cylindrical outer shape of first end
On the basis of be equiangularly alternatively arranged.In this case, about circumferential when magnet arrangement body is used for rotation angle detector
The deviation of sensor characteristics is suppressed.
In the magnet arrangement body involved in other way, holding section includes the periphery for being circumferentially set to first end
The endless groove in face, binding magnet formed body enter endless groove.In this case, especially with regard to the axial of binding magnet formed body
Opposite positional shift and binding magnet formed body is suppressed from the disengaging of axis.
In the magnet arrangement body involved in other way, holding section includes the mesh for being set to the outer peripheral surface of first end
The relief pattern of shape.In this case, being set to the cancellous of the outer peripheral surface of first end by the covering of binding magnet formed body
Relief pattern, the outer peripheral surface engaging of the inner peripheral surface and first end of the through hole of binding magnet formed body.
Rotation angle detector involved in one mode of the utility model, has above-mentioned magnet arrangement body, He
The Magnetic Sensor of one end side and magnet arrangement body relative configuration.In addition, electronic involved in a mode of the utility model
Power steering gear has above-mentioned rotation angle detector.
Detailed description of the invention
Fig. 1 is the summary sectional view for indicating to have the motor assembly of rotation angle detector involved in embodiment.
Fig. 2 is the square construction drawing for indicating the electric power steering device using motor assembly shown in FIG. 1.
Fig. 3 is the approximate stereogram for indicating rotation angle detector shown in FIG. 1.
Fig. 4 is (a) side view and (b) line B-B sectional view for the mode of first end for indicating axis shown in Fig. 3.
Fig. 5 is the side view for indicating the mode of first end of the mode different from Fig. 4.
Fig. 6 is the side view for indicating the mode of first end of the mode different from Fig. 4.
Fig. 7 is the side view for indicating the mode of first end of the mode different from Fig. 4.
Fig. 8 is the side view for indicating the mode of first end of the mode different from Fig. 4.
Fig. 9 is (a) side view and (b) line B-B sectional view for the mode of first end for indicating the mode different from Fig. 4.
Specific embodiment
Hereinafter, explaining the mode for implementing the utility model in detail referring to attached drawing.In addition, to identical or same
Element marks identical symbol, and in repeated explanation, the description thereof will be omitted.
Fig. 1 is the outline section for indicating to have the motor assembly 10 of rotation angle detector involved in embodiment
Figure.Motor assembly 10 has the structure that rotation angle detector 15 and electric motor 20 are accommodated in framework 12.
Electric motor 20 has the rotary shaft 22 with torque side end 22a and sensor side end 22b.Rotary shaft 22
Torque side end 22a is rotatably kept by being set to the ball bearing 14A of framework 12, and sensor side end 22b passes through
The ball bearing 14B for being set to framework 12 is rotatably kept.
In sensor side end, 22b is equipped with following magnet arrangement bodies 30.In addition, in the inside of framework 12, with magnetic
The close and opposite position of iron construction body 30 is configured with rotation sensor (Magnetic Sensor) 40.In the present embodiment, by magnet
Structural body 30 and rotation sensor 40 constitute rotation angle detector 15.The detection of rotation sensor 40 is generated by magnet arrangement body 30
Magnetic field.Rotation sensor 40 has such as the detection circuit constituted by wheatstone bridge circuits, as above-mentioned favour stone electricity
The magnetic detecting element of bridge circuit has magneto-resistance effect element (MR element).As MR element, such as tunnel magneto-resistance effect can be enumerated
Element (TMR element), anisotropic magneto-resistive effect element (AMR element) and huge magneto-resistance effect element (GMR element) etc..?
In present embodiment, as rotation sensor 40, TMR element is used.By using TMR element, obtain higher than other elements
Output can rotate angle with high accuracy detection.In addition, by using TMR element, it can be small by rotation angle detector 15
Type.Rotation sensor 40 can be tool, and there are two two spindle-type of MR element, detect the central axis relative to magnet arrangement body 30
The direction in the magnetic field in orthogonal face.
Here, being illustrated referring to Fig. 2 to the electric power steering device 50 for using motor assembly 10.
Electric power steering device 50 is also equipped with the commonly referred to as control of ECU in addition to above-mentioned motor assembly 10
The torque sensor 56 of the steering force of portion 52 and detection direction disk 54.Control unit 52 is configured to receive the speed from vehicle
Signal, about motor assembly 10 rotation sensor 40 detect rotary shaft 22 rotation angle information and about steering wheel
The dtc signal of the torque sensor 56 of 54 steering force.In addition, control unit 52 is configured to adjustment driving electric motor 20
Electric current.Control unit 52 when receiving above-mentioned speed signal and dtc signal, will electric current corresponding with them be sent to it is dynamic
The electric motor 20 of power auxiliary drives electric motor 20, and the auxiliary of steering force is carried out by the torque of rotary shaft 22.At this point,
Control unit 52 feeds back the electric current of electric motor 20 according to the rotation angle of the rotary shaft 22 received from rotation sensor 40
Control, the amount of motivation of adjustment auxiliary.
Hereinafter, illustrating the magnet arrangement body 30 of rotation angle detector 15 and the structure of rotation sensor 40 referring to Fig. 3,4.
As shown in Figure 3,4, magnet arrangement body 30 has binding magnet formed body 32 and axis 34.
Binding magnet formed body 32 has disk-shaped shape.In addition, binding magnet formed body 32 has along its thickness
The through hole 33 that direction extends.In the present embodiment, through hole 33 along binding magnet formed body 32 disk-shaped shape
Central axis extends.The section orthogonal with the extending direction of through hole 33 is round.As shown in figure 3, binding magnet formed body 32 exists
There is the pole N and this two poles of the earth of the pole S in the end face 32a opposite with rotation sensor 40.
Binding magnet formed body 32 can be isotropism binding magnet formed body, be also possible to anisotropic bond magnet
Formed body.From the viewpoint of reducing productivity and cost, binding magnet formed body 32 can use isotropism binding magnet
Formed body.
The thickness (central axis direction length) of binding magnet formed body 32 for example can be set to 1~12mm, also can be set to 3
~10mm.The outer diameter (diameter of shape) of binding magnet formed body 32 for example can be set to 5~25mm, it also can be set to 10~
20mm.The diameter of through hole 33 for example can be set to 1~15mm, also can be set to 3~12mm.
Binding magnet formed body 32 includes resin and ferromagnetic powder.Above-mentioned resin is not particularly limited, and can be heat cure
Property resin or thermoplastic resin.As heat-curing resin, such as epoxy resin and phenolic resin can be enumerated etc..As thermoplasticity
Resin can enumerate elastomer, ionomer, ethylene propylene copolymer (EPM) and ethylene-ethyl acrylate copolymer etc..In addition,
As elastomer, polystyrene, olefin-based, carbamate system, Polyester and polyamide-based etc. can be specifically enumerated.It is above-mentioned
Resin is selected according to manufacturing process, formability, heat resistance and mechanical property etc..Binding magnet molding is being manufactured by injection molded
When body 32, above-mentioned resin can be thermoplastic resin.When manufacturing binding magnet formed body 32, in addition to these resins, make sometimes
With coupling agent and other additives etc..From the viewpoint of formability and durability etc., the fusing point of above-mentioned thermoplastic resin is for example
It can be set to 100~350 DEG C, also can be set to 120~330 DEG C.Binding magnet formed body 32 can individually contain a kind of resin,
Two or more resins can also be contained.
As above-mentioned ferromagnetic powder, such as rare earth element magnet powder and ferrite magnet powder can be enumerated etc..From obtaining height
Magnetic characteristic from the perspective of, preferably ferromagnetic powder be rare earth element magnet powder.As rare earth element magnet, R-Fe-B can be enumerated
System, R-Co system and R-Fe-N system etc..R refers to rare earth element.In addition, in the present specification, rare earth element, which refers to, to be belonged to
Scandium (Sc), yttrium (Y) and the lanthanide series of long period type periodic table third race.In lanthanide series for example comprising lanthanum (La), cerium (Ce),
Praseodymium (Pr), neodymium (Nd), samarium (Sm), europium (Eu), gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb)
And lutetium (Lu) etc..In addition, rare earth element can be classified as light rare earth dvielement and heavy rare earth element.In this specification
" heavy rare earth element " indicate Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, " light rare earth dvielement " indicate Sc, Y, La, Ce, Pr,
Nd, Sm and Eu.
Ferromagnetic powder is more preferably R-Fe-B based magnet powder.R-Fe-B based magnet powder preferably contains Nd and Pr
R (Nd, Pr)-Fe-B based magnet powder as R (rare earth element) of at least one party.R-Fe-B based magnet powder except R,
Other than Fe and B, other members such as Co, Ni, Mn, A1, Cu, Nb, Zr, Ti, W, Mo, V, Ga, Zn and Si can also be contained as needed
Element or inevitable impurity.
In the case where binding magnet formed body 32 is isotropism binding magnet formed body, the shape of ferromagnetic powder does not have
Especially limitation is also possible to any of spherical, broken shape, needle-shaped and plate etc..On the other hand, in binding magnet formed body 32
In the case where anisotropic bond magnet formed body, ferromagnetic powder is preferably shaped to needle-shaped or plate etc..Ferromagnetic powder
Average grain diameter is preferably 30~250 μm, and more preferably 50~200 μm.Binding magnet formed body 32 can individually contain a kind of magnetic
Iron powder can also contain two or more ferromagnetic powders.In addition, the definition of average grain diameter is laser diffraction formula granulometry
Volume reference size distribution d50.
In addition, the content of resin is relative to binding magnet from the viewpoint of obtaining desired magnetic characteristic and formability
The full volumetric of formed body 32 can be set to 40~90 volume %, also can be set to 50~80 volume %.In addition, from same viewpoint
It sets out, the content of ferromagnetic powder can be set to 10~60 volume % relative to the full volumetric of binding magnet formed body 32, can also be with
It is set as 20~50 volume %.
Axis 34 is the component of the strip extended along the thickness direction of binding magnet formed body 32, is had substantially cylindric
Outer diameter.The length of axis 34 for example can be 3~20mm, or 5~15mm.In addition, the diameter of axis 34 is designed to axis
34 are embedded in the size of the through hole 33 of binding magnet formed body 32, and may be designed as identical as the diameter of through hole 33 or slightly
It is small.
The material for constituting axis 34 can be selected from non-magnetic material.As the non-magnetic material for constituting axis 34, such as can
Enumerate aluminium, copper, brass and stainless steel etc..Axis 34 is made of brass in the present embodiment.
Axis 34, which has, to be equipped with the first end 35 of binding magnet formed body 32 and is installed on the rotary shaft of electric motor 20
22 the second end 36.The second end 36 is provided with the hole 36a of the axis 34a extension along axis 34.Will be same relative to axis 34
The rotary shaft 22 of axis configuration is when the second end 36 is installed on axis 34, to the hole 36a of the second end 36 indentation electric motor 20
The sensor side end 22b of rotary shaft 22.
It is chimeric with binding magnet formed body 32 in through hole 33 in the first end 35 of axis 34.The first end 35 of axis 34
It is chimeric with the through hole 33 of central axis setting along binding magnet formed body 32, axis 34 and binding magnet formed body 32 as a result,
By arranged coaxial.In the present embodiment, through hole of the end face 35a of the first end 35 of axis 34 from binding magnet formed body 32
33 expose, but first end 35, not completely through binding magnet formed body 32, the end face 35a of first end 35 is present in from bonding
The position (position of introducing) that the end face 32a of magnet formed body 32 is exited.
Here, binding magnet formed body 32 is carried out to the installation of the first end 35 of axis 34 by injection molded.Carry out
When injection molded, firstly, by axis 34 by the second end 36 upward in a manner of be fixed in lower mould.Lower mould has
Form the space of the recess portion of storage axis 34 and the lower part of binding magnet formed body.Then, upper die is installed in lower mould
And by mold close, the die cavity that can manufacture binding magnet formed body 32 is formed in mold.Then, resin and magnetic iron powder will be contained
The feedstock composition at end passes through the liquidations such as heating, and the die cavity injection molding in Xiang Shangshu mold makes its solidification by cooling etc., thus
Binding magnet formed body 32 is formed in the first end 35 of axis 34.Binding magnet formed body 32 be isotropism binding magnet at
In the case where type body, injection molded carries out under no magnetic field.It on the other hand, is anisotropic bond in binding magnet formed body 32
In the case where magnet formed body, injection molded carries out in magnetic field.Binding magnet formed body 32 also can be used using thermosetting
The so-called transfer modling of the property changed resin is shaped and is formed.
In addition, as shown in figure 4, the first end 35 of the axis 34 covered by binding magnet formed body 32 is by from close to end face
A side of 35a is arranged in order, first part 35b, second part 35c and Part III 35d are constituted.First part 35b and
Part III 35d is part substantially with same diameter, and second part 35c is that have than first part 35b and third portion
The part for the diameter for dividing the diameter of 35d small.Therefore, it is set on outer peripheral surface in the first end 35 of axis 34 in second part 35c
It is equipped with endless groove 37 circumferentially.Binding magnet formed body 32 enters endless groove 37.In addition, in the third portion of first end 35
35d is divided to be provided with multiple (being 10 in present embodiment) recess portions 38, binding magnet formed body 32 enters each recess portion 38.It is multiple recessed
Portion 38 is so-called flat annular knurl, is extended along the axis 34a (axis identical with the axis of first end 35) of axis 34, and with axis 34
It is equiangularly alternatively arranged on the basis of axis 34a (referring to Fig. 4 (b)).
Fig. 3 is returned to, on magnet arrangement body 30, the pole N and the pole S of binding magnet formed body 32 are hung down with the axis 34a of axis 34
Separate configuration on straight direction.Magnetostatic field as the M of diagram is generated around magnet arrangement body 30 as a result, in axis 34
The magnetic field in the direction vertical relative to axis 34a is generated on axis 34a.The direction in the magnetic field on axis 34a is according to magnet arrangement body 30
Rotation position on the R of direction of rotation changes, and therefore, passes through what is be oppositely disposed in 35 side of first end and magnet arrangement body 30
Rotation sensor 40 detects the direction in magnetic field, is able to detect the rotation angle of magnet arrangement body 30.
In rotation angle detector 15, the rotary shaft 22 of electric motor 20 is equipped with the second end 36 of axis 34.Then,
The rotation of magnet arrangement body 30 and rotary shaft 22 is interlocked and is rotated centered on the axis 34a of axis 34 to direction R.Therefore, pass through inspection
The rotation angle for surveying magnet arrangement body 30, is able to detect the rotation angle of the rotary shaft 22 of electric motor 20.
As discussed above, in magnet arrangement body 30, the end face 35a of the first end 35 of axis 34 is from bonding magnetic
Iron formed body 32 exposes.Therefore, magnet arrangement body 30 is being pressed to 36 side of the second end, the rotary shaft 22 of electric motor is being pressed
When entering the second end 36, the end face 35a of the first end 35 of exposing can be pressed.That is, can not be to binding magnet formed body 32
It is pressed into applying pressure.Therefore, the breakage or deformation of the binding magnet formed body 32 when indentation are suppressed, and due to them
The variation of caused magnetic characteristic is intentionally inhibited, and the stabilisation of magnetic characteristic is achieved in.
In the present embodiment, above-mentioned endless groove 37 and recess portion 38 are the interior of the through hole 33 of binding magnet formed body 32
The holding section of the outer peripheral surface of circumferential surface and first end 35 engaging.It is opposite to can inhibit binding magnet formed body 32 by this holding section
In axis 34 opposite positional shift or binding magnet formed body 32 from the disengaging of axis 34.In endless groove 37, first part 35b
The scale between scale and second part 35c and Part III 35d between second part 35c is especially in the side of axis 34a
Inhibit binding magnet formed body 32 and axis 34 that positional shift occurs upwards, and inhibits binding magnet formed body 32 from the de- of axis 34
From.In addition, multiple recess portions 38 especially inhibit binding magnet formed body 32 and axis 34 that position occurs in the circumferential direction of the periphery of axis 34
Set offset.Hereby it is achieved that the precision of the rotation angle detected by rotation angle detector 15 improves.
In the present embodiment, multiple recess portions 38 are equiangularly alternatively arranged on the basis of the axis 34a of axis 34, therefore, are closed
The deviation of circumferential sensor characteristics when magnet arrangement body 30 is used for rotation angle detector 15 is suppressed.
It can be various modes as shown in Fig. 5~9 about holding section.
Fig. 5 indicates the first part 35b's that multiple recess portions 38 as holding section are set to the first end 35 of axis 34
Mode.In addition, Fig. 6 indicates the second part 35c that multiple recess portions 38 as holding section are set to the first end 35 of axis 34
The mode of (i.e. the bottom surface of endless groove 37).Even if being Fig. 5 and mode shown in fig. 6, multiple recess portions 38 are also especially in axis 34
Inhibit binding magnet formed body 32 and axis 34 that positional shift occurs in the circumferential direction of periphery.In addition it is also possible to be not in first part
Either one or two of 35b, second part 35c, Part III 35d, and in first part 35b, second part 35c, Part III 35d
Multiple portions setting recess portion 38 mode.
It, can be throughout the as shown in fig. 7, in the case where first end 35 is circular cylinder shaped portion with uniform diameter
Multiple recess portions 38 are arranged in the major part of one end 35.
In Fig. 8, as holding section, the outer peripheral surface of first end 35 is provided with cancellous 39 (so-called thin silk fabric of relief pattern
Eye annular knurl).In this case, covering the cancellous recessed of the outer peripheral surface for being set to first end 35 by binding magnet formed body 32
Convex pattern 39, the outer peripheral surface engaging of the inner peripheral surface and first end 35 of the through hole 33 of binding magnet formed body 32, can inhibit viscous
Magnet formed body 32 is tied relative to the opposite positional shift and binding magnet formed body 32 of axis 34 from the disengaging of axis 34.
In Fig. 9, as holding section, it is flat slot 37A that the outer peripheral surface of first end 35, which is provided with bottom surface,.Slot 37A is logical
It crosses so-called D cutting off processing and is formed, the side of slot 37A is in D shape (referring to Fig. 9 (b)).As holding section, in first end 35
The opposite position of outer peripheral surface can also form a pair of of slot 37A (so-called H cutting).Even this holding section can also press down
Binding magnet formed body 32 processed relative to axis 34 opposite positional shift and binding magnet formed body 32 from the disengaging of axis 34.
The present invention is not limited to the above embodiments, can use various modifications mode.
For example, in the above-described embodiment, using the axis of the shape with cylindrical shape, but also can be used with corner post
The axis of the shape of the shape or elliptic cylindrical shape of shape.In addition, the shape of the through hole of magnet formed body can be suitable according to the shape of axis
Preferably deform.Further more, the shape of magnet formed body is not limited to disk-shaped, it is also possible to other plates (such as quadrangle plate or six
The polygons plates such as side shape plate) shape.In the above-described embodiment, it shows the side of axis and magnet formed body arranged coaxial
Formula, but can also be pacified using being staggered the axis of the axis of axis and magnet formed body in the position for deviateing the central axis of magnet formed body
Fill the mode of axis.
In addition, in the above-described embodiment, as by indentation by the axis 34 of magnet arrangement body 30 and electric motor 20
The structure that rotary shaft 22 links shows the mode in the hole 36a insertion rotary shaft 22 for 36 side of the second end for being set to axis 34, but
Or in 22 side providing holes of rotary shaft, in the mode of the second end 36 of hole insertion axis 34.
Further more, as long as axis 34 is then also possible to by being pressed into the structure linked with the rotary shaft 22 of electric motor 20
Hollow part or cartridge.
In addition, if the end face 35a of the first end 35 of axis 34 exposes from binding magnet formed body 32, the first of axis 34
End 35 can be the mode completely through binding magnet formed body 32, or the end face 35a of first end 35 is present in
Mode from the position that the end face 32a of binding magnet formed body 32 stretches out.It is formed in the first end 35 of axis 34 from binding magnet
In the case that body 32 stretches out, when carrying out the indentation of magnet arrangement body 30, it is easy pressing end face 35a and is on the other hand easy to produce
The state of affairs that axis 34 is contacted with rotation sensor 40.
Claims (10)
1. a kind of magnet arrangement body, wherein
Have:
Binding magnet formed body, the shape with plate, and there is the through hole extended along thickness direction；And
Axis has the first end chimeric with the through hole of the binding magnet formed body and should be installed on arranged coaxial
Rotary shaft the second end,
Expose from the binding magnet formed body end face of the first end of the axis.
2. magnet arrangement body according to claim 1, wherein
The binding magnet formed body has the through hole of circular cross-section, and the first end of the axis has circle
Columnar shape,
It is provided with the outer peripheral surface engaging of the inner peripheral surface and the first end of the through hole of the binding magnet formed body
Holding section.
3. magnet arrangement body according to claim 2, wherein
The holding section includes the recess portion for being set to the outer peripheral surface of the first end, described in the binding magnet formed body entrance
Recess portion.
4. magnet arrangement body according to claim 3, wherein
The holding section includes that multiple recess portions are circumferentially arranged with the multiple in the outer peripheral surface of the first end
Recess portion.
5. magnet arrangement body according to claim 4, wherein
The multiple recess portion is equiangularly alternatively arranged on the basis of the central axis of the cylindrical outer shape of the first end.
6. the magnet arrangement body according to any one of claim 2~5, wherein
The holding section includes the endless groove for being circumferentially set to the outer peripheral surface of the first end, the binding magnet molding
Body enters the endless groove.
7. the magnet arrangement body according to any one of claim 2~5, wherein
The holding section includes the cancellous relief pattern for being set to the outer peripheral surface of the first end.
8. magnet arrangement body according to claim 6, wherein
The holding section includes the cancellous relief pattern for being set to the outer peripheral surface of the first end.
9. a kind of rotation angle detector, wherein
Has magnet arrangement body according to any one of claims 1 to 8 and in the first end side and the magnet arrangement
The Magnetic Sensor of body relative configuration.
10. a kind of electric power steering device, wherein
Has rotation angle detector as claimed in claim 9.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017251733A JP7081145B2 (en) | 2017-12-27 | 2017-12-27 | Magnet structure, rotation angle detector and electric power steering device |
| JP2017-251733 | 2017-12-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209263897U true CN209263897U (en) | 2019-08-16 |
Family
ID=67304741
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821834725.0U Active CN209263897U (en) | 2017-12-27 | 2018-11-08 | Magnet arrangement body, rotation angle detector and electric power steering device |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP7081145B2 (en) |
| CN (1) | CN209263897U (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7200574B2 (en) * | 2018-09-27 | 2023-01-10 | 日立金属株式会社 | Shaft-integrated bonded magnet and its manufacturing method |
| KR102299303B1 (en) * | 2019-11-25 | 2021-09-09 | 계양전기 주식회사 | Sensing magnet assembly and method for fabricating the same |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005020974A (en) | 2003-06-30 | 2005-01-20 | Mitsubishi Electric Corp | Motor and blower using the same |
| JP5205855B2 (en) | 2007-08-08 | 2013-06-05 | 株式会社ジェイテクト | Magnet mold shaft material |
| DE102008043639A1 (en) | 2008-11-11 | 2010-05-12 | Zf Lenksysteme Gmbh | Sensor device for detecting the rotational position of a rotating shaft |
| KR101103925B1 (en) | 2010-09-09 | 2012-01-12 | 뉴모텍(주) | Motor with improved revolution property |
| JP6673788B2 (en) | 2016-09-12 | 2020-03-25 | 日立オートモティブシステムズ株式会社 | Rotation angle detector |
-
2017
- 2017-12-27 JP JP2017251733A patent/JP7081145B2/en active Active
-
2018
- 2018-11-08 CN CN201821834725.0U patent/CN209263897U/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| JP7081145B2 (en) | 2022-06-07 |
| JP2019118215A (en) | 2019-07-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8957669B2 (en) | Magnet and holder assembly having improved rotational and axial stability | |
| CN107221402B (en) | Magnet arrangement body and rotation angle detector | |
| JP5615448B2 (en) | Angle sensor, gear for angle sensor, and manufacturing method of gear | |
| CN102171910B (en) | Motor | |
| CN108735418B (en) | Magnet, magnet structure, and rotation angle detector | |
| CN209263897U (en) | Magnet arrangement body, rotation angle detector and electric power steering device | |
| CN110243279A (en) | Magnet arrangement body, rotation angle detector and electric power steering device | |
| JP2016153766A (en) | Magnet structure and rotation angle detector | |
| JP6467977B2 (en) | Magnet structure and rotation angle detector | |
| JP4358743B2 (en) | Method for manufacturing bonded magnet and method for manufacturing magnetic device including bonded magnet | |
| JP2018127668A (en) | Molding die for anisotropic bonded magnet and production method using the same | |
| JP2019158411A (en) | Magnet structure, rotation angle detector, and electrically-driven power steering device | |
| JP2018142635A (en) | Molding die for anisotropic bond magnet and manufacturing method using the same | |
| US20170234699A1 (en) | Tapered magnet | |
| CN209355860U (en) | Magnet arrangement body, rotation angle detector and electric power steering device | |
| CN101779364A (en) | Method of producing rare earth anisotropic bond magnet, method of orienting compacted magnet body and apparatus for compacting in magnetic field | |
| JP7067141B2 (en) | Manufacturing method of magnet structure, rotation angle detector, electric power steering device, and magnet structure | |
| JP6954187B2 (en) | Magnet structure, rotation angle detector and electric power steering device | |
| JP7151104B2 (en) | Magnet structure, rotation angle detector and electric power steering device | |
| JP4577604B2 (en) | Method for producing anisotropic rare earth bonded magnet | |
| CN104969310B (en) | The correction of the angular error of permanent magnet | |
| CN107091997B (en) | Conical magnet | |
| JP6897638B2 (en) | Magnet evaluation method and evaluation device | |
| JP4032706B2 (en) | Magnet roller manufacturing method and magnet roller manufactured by the manufacturing method | |
| JP2017139401A (en) | Magnetic marker and manufacturing method therefor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |