Encoder

Abstract

An encoder according to an embodiment includes: a shaft; an annular magnet connected to the shaft; a housing accommodating at least a portion of the shaft and the annular magnet; and a shield member protruding from the housing in a first direction orthogonal to an axial direction of the shaft.

Description

Technical Field

[0001] The embodiment relates to an encoder. Background Technology

[0002] Rotary encoders track the direction changes and rotation of a motor shaft and generate digital information about its position and motion. Types of rotary encoders include incremental, absolute, magnetic, and optical, and regardless of the type, they all perform the same function.

[0003] In particular, rotary magnetic encoders offer a variety of advantages, including stable operation in environments subjected to severe shocks or vibrations or at high temperatures, strong resistance to external environmental factors such as dust, compact size, and low manufacturing cost. Therefore, rotary magnetic encoders are widely used in applications such as automotive anti-lock braking systems (ABS), industrial automation equipment, medical devices, and robotic devices requiring precise and complex motion control. Furthermore, rotary magnetic encoders are available in various types, including incremental, absolute, non-contact, bearing-type, and rotary.

[0004] However, the performance of a rotary magnetic encoder may degrade when magnetized debris enters or is located near it. Therefore, to prevent the influence of strong external magnetic fields, a shielding member made of a material with high magnetic permeability (above 4,000) and implemented as a housing can be used to protect the sensor and magnet included in the rotary magnetic encoder. In this case, the shielding function can be adequately achieved. However, for functions other than shielding, such as connecting the encoder to another external structure, a separate component needs to be added to the encoder, which may increase manufacturing costs and complicate the structure.

[0005] Furthermore, even when the housing is implemented as a shielding component, external magnetic fields can easily be introduced from the outside through the connector to the encoder channel, penetrating the housing and interfering with the accurate sensing of the magnetic field by the sensor located inside the encoder. Therefore, research is underway to address this issue. Summary of the Invention

[0006] Technical issues

[0007] The embodiment provides an encoder capable of accurately sensing magnetic fields.

[0008] Technical solution

[0009] The encoder according to an embodiment may include a shaft, an annular magnet connected to the shaft, a housing configured to accommodate at least a portion of the shaft and the annular magnet, and a shielding likage configured to protrude from the housing in a first direction orthogonal to the axial direction of the shaft.

[0010] In the example, the encoder may further include a sensor configured to face the ring magnet and a substrate coupled to and fixed to the housing, the sensor being disposed on the substrate.

[0011] In the example, the shielding component may protrude from one side of the housing in the first direction.

[0012] In the example, the housing may include an upper plate, a lower plate disposed below the upper plate, and an intermediate plate, the intermediate plate being joined to the upper and lower plates and including a receiving space defined therein to accommodate at least a portion of the shaft, an annular magnet, and a sensor.

[0013] In one example, the shielding component may include an upper shielding portion projecting from one side of the upper plate in a first direction and a lower shielding portion projecting from one side of the lower plate in the same direction as the projection direction of the upper shielding portion.

[0014] In the example, the rotary magnetic encoder may further include a cable connected to the sensor, and the housing may include a connection opening formed in the housing to communicate with the outside and to allow the cable to be introduced into the connection opening.

[0015] In the example, the connecting opening and the shaft can face each other in a first direction, and each of the upper and lower shields can face the shaft in a second direction.

[0016] In the example, the first direction and the second direction can be the same as each other or can be orthogonal to each other.

[0017] In the example, at least a portion of each of the upper and lower shielding portions may have a rectangular shape.

[0018] In the example, at least a portion of each of the upper and lower shielding portions may have a semi-circular planar shape.

[0019] In the example, the ring magnet can be positioned below the upper plate, the sensor can be positioned below the ring magnet, and the substrate can be positioned below the sensor and above the lower plate.

[0020] In the example, the width of each of the upper and lower shielding portions in a second direction orthogonal to a first direction corresponding to the protruding direction of each of the upper and lower shielding portions can be more than 33% of the outer diameter of the upper plate.

[0021] In the example, the length from the center of the shaft to the end of at least one of the upper or lower shielding parts in the first direction can be more than 91% of the outer diameter of the upper plate.

[0022] In the example, the length when the first horizontal direction and the second horizontal direction are orthogonal to each other can be 120% to 195% of the length when the first horizontal direction and the second horizontal direction are the same as each other.

[0023] In the example, the width of the connection opening in the second direction can be 25% to 100% of the width of at least one of the upper or lower shielding portions in the second direction.

[0024] In the example, the height of the connecting opening in a third direction orthogonal to each of the first and second directions can be 57% to 95% of the width of at least one of the upper or lower shielding portions in the second direction.

[0025] Beneficial effects

[0026] The rotary magnetic encoder according to an embodiment includes a shielding component, thus being less affected by external magnetic fields. Therefore, the rotary magnetic encoder can accurately sense the rotation angle of the shaft, and due to the shielding component, it can be easily connected to external structures, thereby simplifying manufacturing processes or reducing manufacturing costs. Attached Figure Description

[0027] Figure 1a This is a perspective view showing the appearance of the encoder according to an embodiment.

[0028] Figure 1b yes Figure 1a The encoder plan view is shown.

[0029] Figure 1c This is a side sectional view of an encoder according to another embodiment.

[0030] Figure 1d When viewed from the right side Figure 1a The encoder shown is viewed from the right.

[0031] Figure 2a and Figure 2b These are perspective views and plan views of an encoder according to another embodiment.

[0032] Figure 3 This is a perspective view of an encoder according to yet another embodiment.

[0033] Figure 4 It is a three-dimensional graph showing the strength of the magnetic field according to the size of the shielding component.

[0034] Figure 5 It is a graph showing the strength of the magnetic field according to the height of the connection opening.

[0035] Figure 6 This is a cross-sectional view of the encoder based on the comparative example.

[0036] Figure 7 This is a cross-sectional view of an encoder according to yet another embodiment.

[0037] Figures 8a to 8d This is a view showing the magnetic field strength at the entrance of the connecting opening, depending on the location of the large magnetic field object.

[0038] Figure 9a and Figure 9b It is a graph showing the phase difference based on the outer diameter of the toroidal magnet.

[0039] Figure 10a and Figure 10b This is a perspective view illustrating an application example of the encoder in the embodiment. Detailed Implementation

[0040] This disclosure will now be described more fully below with reference to the accompanying drawings, in which various embodiments are illustrated. However, examples may be implemented in many different forms and should not be construed as limited to the embodiments set forth herein. It should be understood that this disclosure covers all modifications, equivalents, and alternatives falling within the scope and spirit of this disclosure.

[0041] While ordinal numbers including "second," "first," etc., can be used to describe various components, they are not intended to limit the components. These expressions are only used to distinguish one component from another. For example, without departing from the scope of this disclosure, a second element may be referred to as a first element, and similarly, a first element may be referred to as a second element. As used herein, the term "and / or" includes any and all combinations of more than one of the related listed items.

[0042] It should be understood that when a component is described as being "connected" or "joined" to another element, that element may be directly connected or coupled to the other element, or there may be intermediate elements. Conversely, when an element is described as being "directly connected" or "directly coupled" to another element, there are no intermediate elements.

[0043] In the description of the embodiments, it should be understood that when a component such as a layer (film), region, pattern, or structure is referred to as being "on" or "under" another component such as a substrate, layer (film), region, pad, or pattern, the terms "on" or "under" indicate that the component is "directly" on or under the other component, or "indirectly" formed, with intermediate elements also possible. It should also be understood that the standard for "on" or "under" is based on the accompanying drawings. Furthermore, for clarity and ease of explanation, the thickness or dimensions of layers (films), regions, patterns, or structures shown in the drawings may be exaggerated, omitted, or drawn schematically, and may not accurately reflect actual dimensions.

[0044] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments of this disclosure. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. It should be further understood that when the terms “comprising” or “having” are used herein, it indicates the presence of the stated feature, integer, step, operation, component, assembly, or combination thereof, but does not exclude the presence or addition of one or more other features, integers, steps, operations, components, assemblies, or combinations thereof.

[0045] Unless otherwise defined, all terms used herein, including technical or scientific terms, shall have the same meaning as commonly understood by one of ordinary skill in the art. Unless expressly defined in the specification, terms such as those defined in a general dictionary shall be interpreted as having the same meaning as the term in the context of the relevant art and shall not be interpreted as having an ideal or overly formal meaning.

[0046] In the following description, embodiments will be described in detail with reference to the accompanying drawings. Identical or equivalent parts are indicated by the same reference numerals even if they are depicted in different drawings, and redundant descriptions will be omitted.

[0047] Furthermore, a Cartesian coordinate system (x-axis, y-axis, z-axis) will be used to describe some embodiments. In the Cartesian coordinate system, the x-axis, y-axis, and z-axis shown in each figure are orthogonal to each other, but the embodiments are not limited to this. The x-axis, y-axis, and z-axis may intersect each other at an angle.

[0048] In the following, a rotary magnetic encoder (hereinafter referred to as "encoder") according to an embodiment will be described with reference to the accompanying drawings.

[0049] Figure 1a This is a perspective view showing the appearance of the encoder 100A according to an embodiment. Figure 1b yes Figure 1a The plan view of encoder 100A shown is shown. Figure 1c This is a side sectional view of encoder 100B according to another embodiment, and Figure 1dWhen viewed from the right (i.e., in the -y-axis direction) Figure 1a The right-side view of the encoder 100A shown.

[0050] According to an embodiment, encoder 100A or 100B includes shaft 110, annular magnet 120, sensor 130, shielding component 150A or 150B, and housing 160A.

[0051] Shaft 110 can perform rotational motion in the direction of arrow A1. Shaft 110 can be formed of a material with a magnetic permeability close to 1, such as aluminum or plastic. However, the embodiments are not limited to this. Shaft 110 can be coupled to an object whose rotation angle will be sensed by encoder 100A or 100B, and therefore can be formed of a material with rigidity capable of maintaining coupling with the object. Shaft 110 can protrude upward and / or downward from housing 160A.

[0052] The ring magnet 120 can be coupled to the shaft 110 so as to connect to and rotate with the shaft 110. As the ring magnet 120 rotates with the shaft 110, the strength of the magnetic field measured by the sensor 130 can change. For example, the ring magnet 120 can be formed of a general magnetic material with magnetic permeability, such as neodymium (Nd) magnet or ferrite.

[0053] The sensor 130 can be configured to face the toroidal magnet 120 and can sense the magnetic field that changes according to the rotation of the toroidal magnet 120.

[0054] According to this embodiment, encoder 100A or 100B may further include a substrate 140. Sensor 130 may be disposed on substrate 140, and substrate 140 may be coupled to and fixed to housing 160A. Therefore, when shaft 110 and annular magnet 120 perform rotational movement, substrate 140 and sensor 130 disposed on substrate 140 may remain fixed and not perform rotational movement. That is, substrate 140 may be configured to remain fixed during rotation of shaft 110.

[0055] Despite Figure 1c The sensor 130 is shown as being disposed on the substrate 140, but the embodiment does not limit the sensor 130 to any particular arrangement relative to the substrate 140.

[0056] The housing 160A may include a receiving space SP, which is defined within the housing 160A to receive at least a portion of the shaft 110, the annular magnet 120, and the sensor 130.

[0057] Shielding member 150A or 150B may be configured to protrude from housing 160A in a horizontal direction. According to an embodiment, shielding member 150A or 150B may be offset and protrude from one side of housing 160A in the y-axis direction, which is horizontal. That is, shielding member 150A or 150B may protrude from housing 160A in the y-axis direction, which is orthogonal to the z-axis direction corresponding to the axial direction of shaft 110.

[0058] The shielding components 150A or 150B, as described above, can suppress the introduction of external magnetic fields into the encoder 100A or 100B, suppress magnetic field leakage from the inside of the encoder 100A or 100B to the outside, and can serve as a bridge to facilitate the integration of the encoder 100A or 100B into an external structure. (See below for further details.) Figure 10a and Figure 10b This will be described.

[0059] According to this embodiment, the shielding component 150A can be formed of a magnetic material with a transmittance of 4,000 to 5,000, such as carbon steel such as S45C or SPCC. However, the embodiment is not limited to this. If the shielding component 150A or 150B is formed of a material with a high magnetic transmittance of more than 5,000, magnetic field absorption may occur.

[0060] Reference Figure 1c The annular magnet 120 can be positioned below the upper plate UP, the sensor 130 can be positioned below the annular magnet 120, and the substrate 140 can be positioned below the sensor 130 and above the lower plate LP.

[0061] On the other hand, the housing 160A may include an upper plate UP, an intermediate plate CPA, and a lower plate LP. The upper plate UP may be located on the upper side of the housing 160A, and the lower plate LP may be located on the lower side of the housing 160A, that is, below the upper plate UP. The intermediate plate CPA may be combined with the upper plate UP and the lower plate LP to define an accommodating space SP.

[0062] According to an embodiment, the shielding component 150A or 150B may include an upper shielding portion 152A or 152B and a lower shielding portion 154A or 154B.

[0063] According to the embodiments, such as Figure 1a , Figure 1b and Figure 1dAs shown, the upper shielding portion 152A can be configured to protrude from one side of the upper plate UP in the y-axis direction, which is the horizontal direction, and the lower shielding portion 154A can be configured to protrude from one side of the lower plate LP in the same y-axis direction as the protrusion direction of the upper shielding portion 152A. That is, the upper shielding portion 152A and the lower shielding portion 154A can be configured to protrude in the same direction. In this way, according to the embodiment, the upper plate UP and the upper shielding portion 152A can be disposed on the same horizontal plane, and the lower plate LP and the lower shielding portion 154A can be disposed on the same horizontal plane.

[0064] According to another embodiment, such as Figure 1c As shown, the upper shielding portion 152B may include a first portion P1 disposed on the upper side of the housing 160A (i.e., on the upper plate UP), and a second portion P2 protruding from the first portion P1 in the y-axis direction, which is the horizontal direction. The lower shielding portion 154B may include a third portion P3 disposed on the lower side of the housing 160A (i.e., under the lower plate LP), and a fourth portion P4 protruding from the third portion P3 in the y-axis direction, which is the horizontal direction.

[0065] Figure 1a , Figure 1b and Figure 1d The upper shielding portion 152A and the lower shielding portion 154A shown can perform shielding functions. Similarly, Figure 1c The second part P2 and the fourth part P4 shown can perform the masking function.

[0066] As described above, encoders 100A and 100B have the same configuration, except that shielding components 150A and 150B differ in shape. Therefore, apart from the shapes of shielding components 150A and 150B, Figure 1c Along Figure 1b The side sectional view of encoder 100A is corresponding to the line A-A' in the diagram.

[0067] also, Figure 1a , Figure 1b and Figure 1d The configuration shown is the same as Figure 1c The first part P1 and the upper plate UP shown are integrally formed and Figure 1c The third part P3 and the lower plate LP are shown as being formed as a single unit.

[0068] The encoder 100A or 100B according to the embodiment may further include a cable (not shown) connected to the sensor 130 and a controller (not shown) connected to the cable.

[0069] The magnetic field change sensed by sensor 130 can be transmitted to an externally located controller (not shown) via a cable (not shown), and the drive current required to drive sensor 130 to sense the magnetic field change can be provided to sensor 130 from outside encoder 100A or 100B via a cable. For this purpose, housing 160A may further include a connection opening OP.

[0070] The connection opening OP can be used to allow the interior of the housing 160A to communicate with the outside, and can have a shape that can accommodate cables inserted therein.

[0071] Figure 2a and Figure 2b These are perspective views and plan views of encoder 100C according to another embodiment.

[0072] Figure 3 This is a perspective view of encoder 100D according to yet another embodiment.

[0073] According to the embodiments, such as Figures 1a to 1d and Figure 3 As shown, at least a portion of the upper shielding portion 152A or 152B may have a rectangular planar shape, and at least a portion of the lower shielding portion 154A or 154B may have a rectangular bottom surface shape.

[0074] According to another embodiment, such as Figure 2a and Figure 2b As shown, at least a portion of the upper shielding portion 152C may have a semi-circular planar shape. At least a portion of the lower shielding portion 154C may have a semi-circular bottom surface shape.

[0075] As described above, except that the upper shielding portions 152A, 152B, and 152C differ in planar shape and the lower shielding portions 154A, 154B, and 154C differ in bottom surface shape, Figure 2a and Figure 2b The encoder 100C shown is Figures 1a to 1d The encoders 100A and 100B shown are identical, so their redundant descriptions will be omitted.

[0076] In the following text, the direction in which the connecting opening OP and the shaft 110 face each other will be referred to as the "first horizontal direction", and the direction in which the upper shielding parts 152A, 152B and 152C and the lower shielding parts 154A, 154B and 154C face the shaft 110 will be referred to as the "second horizontal direction".

[0077] According to the embodiments, such as Figure 1a or Figure 2aAs shown, the first horizontal direction and the second horizontal direction can be the same direction. That is, the connecting opening OP and the shaft 110 can face each other in the first horizontal direction, which is the y-axis direction, and the upper shielding part 152A or 152C and the lower shielding part 154A or 154C can face the shaft 110 in the second horizontal direction, which is the y-axis direction.

[0078] According to another embodiment, such as Figure 3 As shown, the first horizontal direction and the second horizontal direction can be different from each other. For example, the first horizontal direction and the second horizontal direction can be orthogonal to each other. That is, the connecting opening OP and the shaft 110 can face each other in the first horizontal direction, which is the x-axis direction, while the upper shielding part 152A or 152C and the lower shielding part 154A or 154C can face the shaft 110 in the y-axis direction. That is, Figure 1a The connection opening OP shown is positioned in the intermediate plate CPA and Figure 3 The connection openings OP shown are located in different positions within the intermediate plate CPB.

[0079] The dimensions of the shielding component 150A or 150B and the connecting opening OP according to the embodiments will be described below.

[0080] Figure 4 This is a three-dimensional graph showing the intensity of the magnetic field Mag B according to the dimensions X1 and Y1 of the shielding components 150A, 150B, and 150C. X1 and Y1 will be described here later.

[0081] Reference Figure 1b The width X1 of each of the upper shielding portion 152A and the lower shielding portion 154A in a second direction (i.e., the x-axis direction) orthogonal to the first direction (i.e., the y-axis direction) that protrudes from each of the upper shielding portion 152A and the lower shielding portion 154A is referred to as the "first width". In this case, the first width X1 may be more than 30% of the outer diameter OD1 of the upper plate UP (hereinafter referred to as the "first outer diameter").

[0082] The length Y1 from the center PO of shaft 110 to the end of at least one of the upper shielding portion 152A or the lower shielding portion 154A in the first direction (i.e., the y-axis direction) is referred to as the "first length". In this case, the first length Y1 can be more than 90% of the first outer diameter OD1 of the upper plate UP. For example, the first width X1 can be 3 mm to 5 mm, preferably 4 mm or more, and the first length Y1 can be 9 mm to 13 mm, preferably 11 mm or more. Furthermore, when such... Figure 2a and Figure 2b When implementing encoder 100C as shown, the first length Y1 can be increased. For example, Figure 2a and Figure 2bThe first length Y2 shown can be 12.9 mm.

[0083] Although not shown, but Figure 1c The first part P1 shown has the same as Figure 1b The upper plate UP shown has the same planar shape, and the second part P2 has the same... Figure 1b The upper shielding portion 152A shown has the same planar shape. Furthermore, Figure 1c The third part P3 shown has the same characteristics as... Figure 1b The lower plate LP shown has the same bottom surface shape, and the fourth part P4 has the same... Figure 1b The bottom surface shape is the same as that of the lower shield 154A shown.

[0084] exist Figure 1c In the configuration shown, the width of each of the upper shielding portion 152B and the lower shielding portion 154B in a second direction (i.e., the x-axis direction) orthogonal to the first direction (i.e., the y-axis direction) protruding from each of the upper shielding portion 152B and the lower shielding portion 154B is referred to as the "second width". In this case, the second width may be more than 30% of the first outer diameter OD1 of the upper plate UP. The length from the center PO of the shaft 110 to the end of at least one of the second portion P2 or the fourth portion P4 in the first direction (i.e., the y-axis direction) is referred to as the "second length". In this case, the second length may be more than 90% of the outer diameter of the first portion P1 or the third portion P3.

[0085] In addition, such as Figure 3 The first length Y1 (or second length) when the first and second horizontal directions are orthogonal to each other can be from 14.4 mm to 23.4 mm, which corresponds to... Figure 1a and Figure 2a When the first horizontal direction and the second horizontal direction are the same, the first length Y1 (or the second length) is 120% to 195%.

[0086] Figure 5 This is a graph showing the strength of the magnetic field Mag B according to the height of the connection opening OP, where the horizontal axis represents the height of the connection opening OP and the vertical axis represents the strength of the magnetic field entering the connection opening OP. Therefore, "K" represents the strength of the magnetic field entering the connection opening OP according to the height of the connection opening OP. In this case, the maximum magnetic field strength that the sensor 130 can sense is 6 mT.

[0087] According to this embodiment, Figure 1a , Figure 2a and Figure 2bThe width X2 of the connection opening OP shown in the second direction (i.e., the x-axis direction) (hereinafter referred to as the "third width") can be 25% to 100% of the first width X1 in the second direction (i.e., the x-axis direction) of at least one of the upper shielding portion 152A or the lower shielding portion 154A. For example, the third width X2 can be 1 mm to 4 mm.

[0088] According to an embodiment, in Figure 1c In the case of the encoder 100B shown, the third width X2 of the connection opening OP in the second direction (i.e., the x-axis direction) can be 25% to 100% of the first width X1 in the second direction (i.e., the x-axis direction), which is at least one of the second part P2 or the fourth part P4. For example, the third width X2 can be 1 mm to 4 mm.

[0089] also, Figure 1a , Figure 2a , Figure 2b and Figure 3 The height Z of the connection opening OP shown in a third direction (i.e., the z-axis direction) orthogonal to each of the first and second directions can be 57% to 95% of the first width X1 in the second direction (i.e., the x-axis direction) of at least one of the upper shielding portion 152A or 152C or the lower shielding portion 154A or 154C. For example, the height Z can be 2.3 mm to 3.8 mm.

[0090] exist Figure 1c In the configuration shown, the height Z of the connecting opening OP can be 57% to 95% of the first width X1 of at least one of the second part P2 or the fourth part P4.

[0091] In the following description, an encoder according to a comparative example and an encoder according to an embodiment will be described with reference to the accompanying drawings.

[0092] Figure 6 It is a cross-sectional view of the encoder based on the comparative example, and Figure 7 This is a cross-sectional view of encoder 100E according to yet another embodiment. Figure 6 and Figure 7 The sensor diagram is omitted in the text.

[0093] Figure 7 The configuration shown is the same as Figure 1c The lower plate LP of the encoder 100B shown, as well as the third part P3 and the fourth part P4, are implemented as follows: Figure 1d The lower plate LP and the lower shield shown correspond to each other, so their redundant descriptions will be omitted.

[0094] Figure 6The encoder shown according to the comparative example includes a shaft 10, an annular magnet 20, a substrate 40, and a housing 60. The shaft 10, annular magnet 20, substrate 40, and housing 60 perform the same functions as the shaft 110, annular magnet 120, substrate 140, and housing 160A according to the embodiment, and therefore their repeated description will be omitted.

[0095] The encoder according to the comparative example does not include the shielding component of the embodiment. Therefore, as Figure 6 As shown, the magnetic field distributed around the connection opening OP penetrates the encoder and affects the magnetic field inside the encoder. Therefore, the sensor cannot accurately sense the change in magnetic field caused by the rotation of the toroidal magnet 20.

[0096] Conversely, refer to Figure 7 In this embodiment, because the upper shielding portion 152B and the lower shielding portion 154A of the shielding member 150B absorb the external magnetic field, therefore, with Figure 6 In contrast, the strength of the magnetic field in the region surrounding the opening OP can be reduced.

[0097] Figures 8a to 8d This is a view showing the magnetic field strength (hereinafter referred to as "first strength") at the entrance of the connecting opening OP, based on the position of the high magnetic field object 300.

[0098] like Figure 8a As shown, when the high magnetic field object 300 is positioned opposite to the connection opening OP, the first strength is 5.45 mT. Figure 8b As shown, when the high magnetic field object 300 is positioned facing the connection opening OP, the first strength is 2.37 mT. (As...) Figure 8c As shown, when the high magnetic field object 300 is placed below the encoder 100E, the first strength is 5.14 mT. Figure 8d As shown, when the high magnetic field object 300 is placed above the encoder 100E, the first intensity is 5.01 mT.

[0099] exist Figure 6 In the comparative example shown, the magnetic field strength at the entrance of the opening OP (hereinafter referred to as the "second strength") was measured to be 24.5 mT. Therefore, it can be seen that the first strength is reduced by 77.8% to 79.6% compared to the second strength.

[0100] Figure 9a and Figure 9b It is a graph showing the phase difference based on the outer diameter OD2 (hereinafter referred to as the "second outer diameter") of the toroidal magnet 120, where the horizontal axis represents the rotation angle of the shaft 110 and the vertical axis represents the magnetic field (or magnetic force).

[0101] If the magnetic field strength in the vertical z-axis direction is less than the minimum magnetic field strength that sensor 130 can sense, for example, if the second outer diameter OD2 is less than 58% or greater than 75% of the first outer diameter OD1, then... Figure 9a As shown, whenever axis 110 rotates 180°, a phase difference error PD1 greater or less than 180° may occur.

[0102] Conversely, if the magnetic field strength in the vertical z-axis direction is greater than the minimum magnetic field strength that sensor 130 can sense, for example, if the second outer diameter OD2 is 58% to 75% of the first outer diameter OD1, then... Figure 9b As shown, whenever shaft 110 rotates 180°, the phase difference PD2 remains at 180°, thereby preventing phase difference errors. For example, when the minimum magnetic field strength that sensor 130 can sense is 160 mT, the second outer diameter OD2 can be 6.4 mm to 8.2 mm. However, the embodiments are not limited to this.

[0103] The encoders 100A to 100E according to the above embodiments can perform sensing functions in a wide variety of applications. For example, the encoders 100A to 100E can be used not only in devices employing motors and drives, but also in all types of devices related to automation. For example, the encoders 100A to 100E can be used for speed control of household appliances, elevators, conveyors, automated equipment, industrial equipment, and position control of robots.

[0104] Figure 10a and Figure 10b This is a perspective view illustrating an application example of an encoder according to an embodiment.

[0105] Figure 10a and Figure 10b The encoder shown is Figure 1a The encoders shown are identical, therefore the same parts are indicated by the same reference numerals, and their redundant descriptions will be omitted.

[0106] like Figure 10a and Figure 10b As shown, the encoder shaft 110 can be coupled to the first object 500 and can be used to measure the rotation angle of the first object 500 in the direction of arrow A2.

[0107] In this case, the encoder's shielding component 150A can be used to attach the encoder to the second object 400. For example, as Figure 10b As shown, Figure 10a The shielding component 150A shown can be inserted into the hollow portion 400P of the second object 400, so that the encoder is attached to the second object 400.

[0108] In order to make according to Figure 6 The encoder of the comparative example shown is integrated into the second object 400, requiring a separate component to be installed into the housing 60.

[0109] Conversely, according to the embodiment, since the shielding component 150A is used to integrate the encoder into the second object 400, no separate component is required, thereby reducing material costs and simplifying the manufacturing process.

[0110] While this disclosure has been specifically shown and described with reference to exemplary embodiments thereof, these embodiments are provided for illustrative purposes only and are not intended to limit the disclosure. It will be apparent to those skilled in the art that various changes in form and detail may be made without departing from the essential characteristics of the embodiments set forth herein. For example, the configurations set forth in the embodiments may be modified and applied. Furthermore, such modifications and applications should be construed as falling within the scope of this disclosure as defined by the appended claims.

[0111] Methods of implementing the present invention

[0112] Various embodiments have been described in the form best suited for carrying out this disclosure.

[0113] Industrial applicability

[0114] The rotary magnetic encoder according to the embodiment can be widely used in devices such as automotive anti-lock braking systems (ABS), industrial automation equipment, medical devices, and robots that require precise and complex motion control operations.

Claims

1. An encoder, comprising: axis; A ring magnet, the ring magnet being connected to the shaft; A housing configured to accommodate at least a portion of the shaft and the annular magnet; as well as A shielding component, the shielding component being configured to protrude from the housing in a first direction orthogonal to the axial direction of the shaft.

2. The encoder according to claim 1, further comprising: The sensor is configured to face the annular magnet; as well as A substrate, which is bonded and fixed to the housing, and the sensor is disposed on the substrate.

3. The encoder according to claim 1, wherein, The shielding component protrudes from one side of the housing in the first direction.

4. The encoder according to claim 2, wherein, The housing includes: upper plate; A lower plate, wherein the lower plate is disposed below the upper plate; and An intermediate plate, which is joined to the upper plate and the lower plate, includes a receiving space defined within the intermediate plate to receive at least a portion of the shaft, the annular magnet, and the sensor.

5. The encoder according to claim 4, wherein, The shielding component includes: An upper shielding portion, the upper shielding portion protruding from one side of the upper plate in the first direction; and The lower shielding portion protrudes from one side of the lower plate in the same direction as the protrusion direction of the upper shielding portion.

6. The encoder of claim 5, further comprising a cable connected to the sensor. in, The housing includes a connection opening formed in the housing to communicate with the outside and to allow the cable to be introduced into the connection opening.

7. The encoder according to claim 6, wherein, The connecting opening and the shaft face each other in the first direction, and Each of the upper shielding portion and the lower shielding portion faces the axis in the second direction.

8. The encoder according to claim 7, wherein, The first direction and the second direction are the same as each other.

9. The encoder according to claim 7, wherein, The first direction and the second direction are orthogonal to each other.

10. The encoder according to claim 5, wherein, At least a portion of each of the upper shielding portion and the lower shielding portion has a rectangular shape.

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