Encoder with high permeability structure

Abstract

The present application relates to an encoder with a high magnetic permeability structure for improving vibration resistance and impact resistance in an encoder equipped with a magnetic power generation element having a large Barkhausen effect. An encoder (10) with a high magnetic permeability structure is provided with a rotating disk (2), a magnetic field generating portion (3), a magnetic power generation element (4) having a large Barkhausen effect, and a magnetic detection element (5), wherein one or more high magnetic permeability structures (6) capable of changing the relative position with respect to the magnetic power generation element (4) are provided, and the magnetic field generating portion (3) is configured independently of the disk (2).

Description

(19) State Intellectual Property Office (12) Invention Patent Application (10) Application Publication Number (43) Application Publication Date (21) Application Number 202480033795.8 (22) Application Date 2024.12.27 (30) Priority Data 2024-194786 2024.11.06 JP (85) PCT International Application Entering National Phase Date 2025.11.20 (86) PCT International Application Application Data PCT / JP2024 / 046311 2024.12.27 (87) PCT International Application Publication Data WO2026 / 100089 JA 2026.05.15 (71) Applicant: Tamagawa Seiki Co., Ltd. Address: Japan (72) Inventors: Hiroshi Tagawa, Ken Suzuki, Shingo Higashiyama (74) Patent Agency: China Council for the Promotion of International Trade Patent & Trademark Office Co., Ltd. 11038 Patent Attorney Shi Yanming (51) Int.Cl. G01D 5 / 245 (2006.01) (54) Title of Invention: Encoder with High Permeability Structure (57) Abstract: This invention relates to an encoder with a high permeability structure, used to improve vibration resistance and shock resistance in an encoder equipped with a magnetic power generation element with a large Barkhausen effect. The encoder (10) with a high permeability structure is equipped with: a rotating disk (2), a magnetic field generating unit (3), a magnetic power generation element with a large Barkhausen effect (4), and a magnetic detection element (5), wherein one or more high permeability structures, i.e., high permeability structures (6), are provided with the ability to change their relative position with respect to the magnetic power generation element (4), and the magnetic field generating unit (3) is configured independently of the disk (2). Claims 1 page, Description 7 pages, Drawings 6 pages, CN 122349611 A 2026.07.07 CN 1 22 34 96 11 A 1. An encoder with a high permeability structure, the encoder being equipped with a rotating disk, a magnetic field generating unit, a magnetic power generation element having a large Barkhausen effect, and a magnetic detection element, characterized in that one or more high permeability structures, i.e., high permeability structures, are provided with their relative positions to the magnetic power generation element being changeable, and the magnetic field generating unit is configured independently of the disk. 2. The encoder with a high permeability structure according to claim 1, characterized in that the high permeability structure rotates with the disk. 3. The encoder with a high permeability structure according to claim 2, characterized in that the high permeability structure rotates about the magnetic power generation element. 4. The encoder with a high permeability structure according to any one of claims 1, 2, and 3, characterized in that the high permeability structure is formed and configured to be able to rotate between the magnetic field generating unit and the magnetic power generation element.5. The encoder with a high permeability structure as claimed in any one of claims 1, 2, and 3, characterized in that the magnetic field generating part is fixedly disposed on a substrate constituting an element of the encoder. 6. The encoder with a high permeability structure as claimed in any one of claims 1, 2, and 3, characterized in that the high permeability structure is formed of iron, nickel, cobalt, alloys thereof, and other strongly magnetic materials. 7. The encoder with a high permeability structure as claimed in any one of claims 1, 2, and 3, characterized in that, by rotating the high permeability structure, at least one of the magnetic flux density and the direction of the magnetic flux near the magnetic power generation element changes, thereby implementing power generation by the magnetic power generation element. 8. The encoder with a high permeability structure as claimed in any one of claims 1, 2, and 3, characterized in that the magnetic field generating part is configured to form a magnetic circuit with the magnetic power generation element. 9. The encoder with a high permeability structure as claimed in any one of claims 1, 2, and 3, characterized in that the magnetic field generating part and the magnetic power generation element are disposed on the same substrate. 10. The encoder with a high permeability structure as claimed in any one of claims 1, 2, and 3, characterized in that the magnetic field generating part is configured such that the direction of its magnetic flux is consistent with the direction of the magnetic flux in the magnetic power generation element, and the magnetic power generation element is sandwiched between two locations. 11. The encoder with a high permeability structure as claimed in any one of claims 1, 2, and 3, characterized in that two high permeability structures are provided within a range of 180° on the plane of rotation. Claims 1 / 1 page 2 CN 122349611 A Encoder with a High Permeability Structure Technical Field

[0001] The present invention relates to encoders with high permeability structures, and in particular, to a technique capable of improving the vibration resistance and shock resistance of encoders equipped with magnetic power generation elements having the Giant Barkhausen effect. Background Art

[0002] FIG11 is a side sectional view illustrating the basic structure of an encoder equipped with a conventional magnetic power generation element. Additionally, Figure 12 is a top view and partial perspective illustration showing the basic function of the encoder with the high permeability structure of the present invention shown in Figure 11. The encoder 910, incorporating the technology disclosed in the above-mentioned documents and equipped with a conventional magnetic power generation element with the large Barkhausen effect, is configured to include: a rotating disk 92, a magnetic field generating unit 93 such as a magnet, a magnetic power generation element 94 with the large Barkhausen effect, and a magnetic detection element 95. By rotating the magnetic field generating unit 93 and moving it closer to and further away from the magnetic power generation element 94, the magnetic flux density near the magnetic power generation element 94 changes. This generates electricity. As such a conventional...Examples of the technology are shown in Patent Documents 1 and 2, which are disclosed later.

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2021-012174 "Rotary Detector and Motor Equipped with the Rotary Detector"

[0006] Patent Document 2: Japanese Patent No. 7393577 "Rotary Encoder and Servo Control Device Using the Rotary Encoder"

[0007] Patent Document 3: Japanese Patent Application Publication No. 2022-116385 "Rotary Detector and Motor Equipped with the Rotary Detector" Summary of the Invention

[0008] Problems to be Solved by the Invention

[0009] In encoders that incorporate the technology disclosed in the above documents and are equipped with conventional magnetic power generation elements, magnets are mainly used as the magnetic field generating unit. However, magnets have low toughness and weak resistance to vibration and impact. Therefore, there are cases where surface treatment is performed on the surface of the magnet for protection. There is a need for a technology that can improve vibration resistance and impact resistance without surface treatment.

[0010] Therefore, the problem to be solved by the present invention is to provide a technology in which the prior art does not have the problem of improving vibration resistance and shock resistance without surface treatment in an encoder equipped with a magnetic power generation element having a large Backhausen effect.

[0011] Means for solving the problem

[0012] As a result of the inventors of this application's research on the above-mentioned problem, it was found that the above-mentioned problem can be solved by forming a structure in which a magnetic field generating part such as a magnet is fixedly arranged near the magnetic power generation element, and a structure with high magnetic permeability such as iron is close to or far away from the magnetic field generating part and the magnetic power generation element. Based on this discovery, the present invention was completed. That is, as a means for solving the above-mentioned problem, the invention claimed in this application, or at least the invention disclosed, is as follows. Instruction manual, page 1 / 7, CN 122349611 A

[0013] [1] An encoder with a high permeability structure, the encoder being equipped with a rotating disk, a magnetic field generating unit, a magnetic power generation element having a large Barkhausen effect, and a magnetic detection element, characterized in that,

[0014] one or more high permeability structures, i.e., high permeability structures, are provided with the ability to change their relative position to the magnetic power generation element,

[0015] the magnetic field generating unit is configured independently of the disk.

[0016] [2] The encoder with a high permeability structure as described in [1], characterized in that the high permeability structure rotates with the disk.

[0017] [3] The encoder with a high permeability structure as described in [2], characterized in that the high permeability structure rotates around the magnetic power generation element.

[0018] [4] The encoder with a high permeability structure as described in any one of [1], [2], and [3], characterized in that,The high permeability structure is formed and configured to form a magnetic circuit between itself and the magnetic field generating unit and between itself and the magnetic power generation element.

[0019] [5] An encoder with a high permeability structure as described in any one of [1], [2], and [3], characterized in that the magnetic field generating unit is fixedly disposed on a substrate that is an element constituting the encoder.

[0020] [6] An encoder with a high permeability structure as described in any one of [1], [2], and [3], characterized in that the high permeability structure is formed of iron, nickel, cobalt and their alloys, and other strongly magnetic materials.

[0021] [7] An encoder with a high permeability structure as described in any one of [1], [2], and [3], characterized in that, by rotating the high permeability structure, at least one of the magnetic flux density and the direction of the magnetic flux near the magnetic power generation element changes, thereby implementing power generation by the magnetic power generation element.

[0022] [8] An encoder with a high permeability structure as described in any one of [1], [2], and [3], characterized in that the magnetic field generating part is configured to form a magnetic circuit between itself and the magnetic power generation element.

[0023] [9] An encoder with a high permeability structure as described in any one of [1], [2], and [3], characterized in that the magnetic field generating part and the magnetic power generation element are disposed on the same substrate.

[0024]

[10] An encoder with a high permeability structure as described in any one of [1], [2], and [3], characterized in that the magnetic field generating part is configured such that the direction of its magnetic flux is consistent with the direction of the magnetic flux in the magnetic power generation element, and the magnetic power generation element is sandwiched between two locations.

[0025]

[11] An encoder with a high permeability structure as described in any one of [1], [2], and [3], characterized in that two high permeability structures are provided within a range of 180° on the plane of rotation.

[0026] Effects of the Invention

[0027] Since the encoder with a high permeability structure of the present invention is configured in the manner described above, vibration resistance and shock resistance can be improved without surface treatment. That is, in the present invention, a structure is adopted in which a high permeability structure, rather than a magnetic field generating part such as a magnet, is brought closer to or further away from the magnetic power generation element, and as the high permeability structure, a material with higher toughness than a magnet, such as iron, is used, thus improving vibration resistance and shock resistance.

[0028] In addition, in the previously disclosed Patent Document 3, a technique is described in which a magnet is fixedly arranged, and a high permeability material is rotated together with a rotating shaft to obtain the large Backhausen effect. However, this technique uses a high permeability disk for the purpose of shielding the magnetic field of the magnet. On the other hand, the present invention is the opposite, using a high permeability structure to induceThe purpose is to obtain the magnetic field of the magnet; the patentability of this invention cannot be denied by using the prior art. Specification 2 / 7 pages 4 CN 122349611 A Description of Drawings

[0029] FIG1 is an explanatory diagram showing the basic structure of the encoder with a high permeability structure according to the present invention.

[0030] FIG2 is a top view and partial perspective explanatory diagram showing the basic operation of the encoder with a high permeability structure according to the present invention shown in FIG1. ​​

[0031] FIG3 is a bottom view and partial perspective explanatory diagram showing a structural example of the encoder with a high permeability structure according to the present invention.

[0032] FIG4 is a bottom view and partial perspective explanatory diagram showing the operation of the encoder with a high permeability structure shown in FIG3.

[0033] FIG4-2 is a bottom view and partial perspective explanatory diagram showing the flux variation in the encoder with a high permeability structure shown in FIG4.

[0034] FIG5 is a side sectional view showing an embodiment of the encoder with a high permeability structure according to the present invention.

[0035] FIG6 is a perspective view viewed from below the embodiment shown in FIG5.

[0036] FIG7 is a perspective view viewed from above the embodiment shown in FIG5.

[0037] FIG8 is a partial perspective bottom view showing the relationship of the main elements according to the embodiment shown in FIG5.

[0038] FIG9 is a perspective view showing the disk according to the embodiment shown in FIG5.

[0039] FIG10 is a perspective view viewed from below showing the relationship of the main elements according to the embodiment shown in FIG5.

[0040] FIG11 is a side sectional view illustrating the basic structure of an encoder equipped with a conventional magnetic power generation element.

[0041] FIG12 is a top view and partial perspective illustration showing the basic function of the encoder of the present invention with a high permeability structure shown in FIG11. Detailed Description

[0042] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

[0043] FIG1 is a side sectional view illustrating the basic structure of the present invention. FIG2 is a top view illustrating the basic function of the encoder with the high permeability structure of the present invention shown in FIG1. As shown in these figures, the encoder 10 with a high permeability structure is equipped with a rotating disk 2, a magnetic field generating unit 3, a magnetic power generation element 4 with a large Barkhausen effect, and a magnetic detection element 5. Its characteristic structure is that one or more high permeability structures, i.e., high permeability structures 6, are provided with a position that can be changed relative to the magnetic power generation element 4. The magnetic field generating unit 3 is independently configured with respect to the disk 2.

[0044] In this encoder 10 with a high permeability structure, since the magnetic field generating unit 3 is independently configured with respect to the disk 2, even if the disk 2 rotates, the magnetic field generating unit 3 will not rotate. On the other hand, one or more high permeability structures 6...The high permeability structure 6, as shown in (a) and (b) of FIG2, changes its relative position to the magnetic power generation element 4. By changing the relative position of the high permeability structure 6, at least one of the magnetic flux density and magnetic flux direction near the magnetic power generation element 4 changes, thereby generating electricity. In this way, the function undertaken by the rotating magnetic field generating part (93) in the prior art is undertaken by the high permeability structure 6. In addition, such a relative position change is carried out with the rotation of the disk 2.

[0045] The encoder 10 with a high permeability structure of the present invention adopts a structure in which the high permeability structure 6, rather than the magnetic field generating part 3 such as a magnet, approaches or moves away from the magnetic power generation element 4. As the high permeability structure 6, a material such as iron with higher toughness than a magnet is used. Therefore, compared with the prior art, vibration resistance and impact resistance can be improved.

[0046] The high permeability structure 6 of the encoder 10 with a high permeability structure of the present invention can be a structure that rotates with the disk 2. As shown in Figure 1, the high permeability structure 6 is fixedly mounted on the disk 2, and the rotation of the high permeability structure 6 is the same as the rotation of the disk 2. That is, as shown in Figure 2, as the disk 2 rotates, the high permeability structure 6 rotates, thereby changing its relative position with respect to the magnetic power generation element 4, which in turn changes the magnetic flux density near the magnetic power generation element 4.

[0047] In addition, as shown in Figures 1 and 2, the high permeability structure 6 can be a structure that rotates around the magnetic power generation element 4. Thus, the high permeability structure 6, which rotates with the disk 2, changes its relative position with respect to the magnetic power generation element 4, which is its rotation center, thereby generating the magnetic flux density near the magnetic power generation element 4.

[0048] In order to achieve the above-mentioned function, the high permeability structure 6 of the encoder 10 with the high permeability structure can be formed and configured to form magnetic circuits between itself and the magnetic field generating unit 3 and between itself and the magnetic power generation element 4. Such a "specification capable of forming a magnetic circuit" can be any of the following: structural features, morphological features, or material and property features.

[0049] From the viewpoint of forming a magnetic circuit with sufficient magnetic force, it is preferable that the encoder 10 with the high permeability structure has multiple high permeability structures 6, as shown in the various figures. By setting two high permeability structures 6, the sufficient effect expected by the present invention can be obtained. However, it is not desirable to set three high permeability structures 6. This is because: when three are set, the magnetic force will be canceled by the high permeability structure located in the center, and thus, there is a possibility that the magnetic power generation element (Wiegand sensor) 4 will not function. Therefore, the optimal number of high permeability structures 6 is two.

[0050] Furthermore, in situations where a magnetic circuit can be formed, to ensure the directionality of the formed magnetic circuit by varying the magnetic flux density near the magnetic power generation element 4, the high permeability structure 6 is configured. Therefore, it is undesirable to use a configuration of multiple high permeability structures 6 that are point-symmetric or line-symmetric around the magnetic power generation element 4. For example, if two magnetic power generation elements 4 are arranged at a certain angle, it is undesirable to have two more magnetic power generation elements 4 arranged point-symmetrically with them. This is because it is difficult to ensure the directionality of the formed magnetic circuit.

[0051] Iron, nickel, cobalt, their alloys, and other strongly magnetic materials are suitable as materials for the high permeability structure 6. This is because they have high permeability and higher toughness and rigidity than magnets. For example, carbon steel used in mechanical structures such as S45C is suitable as a material for the high permeability structure 6 according to the present invention. Incidentally, the rigidity of S45C is 206 GPa, while the rigidity of neodymium used in permanent magnets is 16.3 Ga. That is, S45C has more than 10 times the rigidity of neodymium.

[0052] The magnetic field generating part 3 of the encoder 10 with the high permeability structure is characterized in that it is configured to form a magnetic circuit between itself and the magnetic power generation element 4. As shown in FIG1, the magnetic field generating part 3 can be a structure that is fixedly provided on the substrate 1 of the encoder 10. As shown in the figure, by fixing the magnetic field generating part 3 near the magnetic power generation element 4, a configuration is formed in which the high permeability structure 6 is close to and away from the magnetic field generating part 3 and the magnetic power generation element 4, and the desired effect of the present invention can be fully obtained. In addition, as the magnetic field generating part 3, in addition to using permanent magnets such as neodymium, an electromagnet structure can also be used.

[0053] FIG3 is a top view of the main parts of the encoder with the high permeability structure of the present invention. As shown in the figure, the encoder 310 with the high permeability structure can be a structure in which the magnetic field generating part 33 is arranged on the same substrate 31 as the magnetic power generation element 34, in addition to the various forms of structure described in FIG1, etc. According to the present invention, the magnetic field generating section 33a, etc. of the encoder 310 are arranged independently of the disk 32. However, as shown in this figure, by being fixedly arranged on the substrate 31, the magnetic field generating section 33a, etc., will not rotate even if the disk 32 rotates.

[0054] In addition, as shown in the figure, the magnetic field generating section can be arranged so that the direction of its magnetic flux is consistent with the direction of the magnetic flux in the magnetic power generation element 34, and the magnetic power generation element 34 can be arranged in two parts, that is, a structure in which the magnetic field generating sections 33a and 33b are provided can be formed. The arrangement relationship between the two magnetic field generating sections 33a and 33b and the magnetic power generation element 34 is as follows:The substrate 31 remains unchanged. Each magnetic field generating section 33a, etc., is composed of the N pole of the dark part indicated by "N" in the figure and the S pole of the light part indicated by "S" (the same applies to the following figures).

[0055] In addition, as shown in the figure, the high permeability structure of this encoder 310 with a high permeability structure can be a structure in which two high permeability structures 36a and 36b are provided within a range of 180° on the plane of rotation. According to this structure, the magnetic circuit formation between the high permeability structure 36, the magnetic field generating section 33, and the magnetic power generation element 34 can be well performed, and the relative position change of the high permeability structure 36 with respect to the magnetic power generation element 34 accompanying the rotation of the disk 32 can be well realized, and at least one of the changes in magnetic flux density or magnetic flux direction near the magnetic power generation element 34 can be smoothly obtained.

[0056] FIG4 is a top view and partial perspective illustration of the main parts of the encoder with a high permeability structure shown in FIG3. Additionally, Figure 4-2 is a bottom-view and partial perspective diagram illustrating the flux variation in the encoder with the high permeability structure shown in Figure 4. In these figures, the flux generation states at 90° intervals when the disk 32 rotates in the disk rotation direction D are shown in the order of (i), (ii), (iii), and (iv). First, in (i) at 0°, the flux MS1 enters from the magnetic power generation element (Wiegand sensor) 34 through the high permeability structure 36a to the S pole of the magnetic field generation section 33a. This flux exits from the N pole of the magnetic field generation section 33a and passes through the high permeability structure 36b, re-entering the magnetic power generation element 34 as flux MN1.

[0057] On the other hand, the flux MS2 entering to the S pole of the magnetic field generation section 33b and the flux MN2 exiting from the N pole are weaker than the fluxes MS1 and MN1 passing through the high permeability structures 36a and 36b. That is, the magnetic flux density of the magnetic fluxes MS1 and MN1 through the high permeability structures 36a and 36b increases (in the figure, the arrows representing magnetic flux are shown thickly. The same applies below). As described above, in the magnetic power generation element 34, the magnetic flux ML shown in the figure, from the side of the high permeability structure 36b to the side of the high permeability structure 36a, is applied in a direction toward the left. This magnetic flux density and the direction of the magnetic flux change with the rotation of the disk 32, resulting in a change in magnetic flux near the magnetic power generation element 34.

[0058] Next, in the state (ii) where the disk 32 has rotated 90° from (i), the magnetic flux MS1 enters from the magnetic power generation element 34 through the high permeability structure 36b to the S pole of the magnetic field generating section 33a, and the magnetic flux exits from the N pole of the magnetic field generating section 33a and re-enters the magnetic power generation element 34 as the magnetic flux MN1. On the other hand, there is a magnetic flux MS2 entering the S pole of the magnetic field generating section 33b, and the magnetic flux MS1 enters the S pole of the magnetic field generating section 33b.And the magnetic flux MN2 that exits from the N pole, passes through the high permeability structure 36a, and re-enters the magnetic power generation element 34.

[0059] Here, the magnetic flux MN1 and magnetic flux MS2 that do not pass through the high permeability structure are weaker than the magnetic flux MS1 and MN2 that pass through the high permeability structures 36b and 36a. That is, the magnetic flux density of the magnetic flux MS1 and MN2 that pass through the high permeability structures 36b and 36a becomes higher. The magnetic flux MN2 tends not to pass through the magnetic power generation element 34, but is easily connected directly to the magnetic flux MS1. Therefore, the magnetic flux applied to the magnetic power generation element 34 becomes approximately zero. Thus, when the disk 32 rotates 90° from (i) to (ii), the magnetic flux density and the direction of the magnetic flux near the magnetic power generation element 34 change.

[0060] Incidentally, in state (iii) where disk 32 has rotated 90° from (ii) and 180° from (i), magnetic flux MS2 enters from the magnetic power generation element 34 through the high permeability structure 36a to the S pole of the magnetic field generating section 33b. This magnetic flux exits from the N pole of the magnetic field generating section 33b and passes through the high permeability structure 36b again as magnetic flux MN2, entering the magnetic power generation element 34.

[0061] On the other hand, the magnetic flux MS1 entering the S pole of the magnetic field generating section 33a and the magnetic flux MN1 exiting from the N pole are weaker than the magnetic fluxes MS2 and MN2 passing through the high permeability structures 36a and 36b. That is, the magnetic flux density of the magnetic fluxes MS2 and MN2 passing through the high permeability structures 36a and 36b is higher. As described above, a magnetic flux MR is applied to the magnetic power generation element 34 from the side of the high permeability structure 36b toward the side of the high permeability structure 36a, as shown in the figure, in the direction toward the right. Thus, when the disk 32 rotates 90° from (ii) to (iii), the magnetic flux density and the direction of the magnetic flux change near the magnetic power generation element 34. Specification 5 / 7 page 7 CN 122349611 A

[0062] Incidentally, in the state (iv) where the disk 32 has rotated 90° from (iii) and 270° from (i), the magnetic flux MS2 enters from the magnetic power generation element 34 through the high permeability structure 36b to the S pole of the magnetic field generating part 33b, and exits from the N pole of the magnetic field generating part 33b, and re-enters the magnetic power generation element 34 as the magnetic flux MN2. On the other hand, there is a magnetic flux MS1 entering the S pole of the magnetic generation section 33a, and a magnetic flux MN1 exiting from the N pole, passing through the high permeability structure 36b, and re-entering the magnetic power generation element 34.

[0063] Here, the magnetic flux MN2 and magnetic flux MS1 that do not pass through the high permeability structure are weaker than the magnetic flux MS2 and MN1 that pass through the high permeability structures 36a and 36b. That is, the magnetic flux density of the magnetic flux MS2 and MN1 that pass through the high permeability structures 36a and 36b is higher.The flux MN2 tends to bypass the magnetic power generation element 34 and is easily connected directly to the magnetic flux MS1. Therefore, the magnetic flux applied to the magnetic power generation element 34 becomes approximately zero. Thus, when the disk 32 rotates 90° from (iii) to (iv), the magnetic flux density and direction near the magnetic power generation element 34 change.

[0064] As explained above, in this encoder 310 with a high permeability structure, as the disk 32 rotates, the relative positions of the high permeability structures 36a and 36b with respect to the magnetic power generation element 34 and the magnetic field generating parts 33a and 33b change, thereby changing the magnetic flux density and direction near the magnetic power generation element 34, and changing the magnitude and direction of the magnetic flux density within the magnetic power generation element 34. As a result, power is generated.

[0065] Embodiments

[0066] An embodiment of the encoder with a high permeability structure of the present invention will be described below, but the present invention is not limited thereto.

[0067] FIG5 is a side sectional view showing an embodiment of the encoder with a high permeability structure of the present invention. Additionally, FIG6 is a perspective view viewed from below this embodiment, FIG7 is a perspective view viewed from above this embodiment, FIG8 is a partial perspective bottom view showing the relationship of the main elements according to this embodiment, FIG9 is a perspective view showing the disk according to this embodiment, and FIG10 is a perspective view viewed from below showing the relationship of the main elements according to this embodiment.

[0068] As shown in the figures, the encoder 510 with high permeability structure in this example has the following characteristic structure: equipped with disk 52, a magnetic power generation element (Wiegand sensor) 54 with large Backhausen effect, magnetic field generating parts 53a and 53b sandwiching the magnetic power generation element 54, and a magnetic detection element (not shown in the figure). The two high permeability structures 56a and 56b are configured to allow the relative position with respect to the magnetic power generation element 54 to change. The magnetic field generating parts 53a and 53b are configured independently of disk 52, that is, the magnetic field generating parts 53a and 53b are disposed together with the magnetic power generation element 54 on the substrate 51.

[0069] With this structure, in the encoder 510 with high permeability structures in this example, even if the disk 52 rotates, the magnetic field generating units 53a and 53b will not rotate. On the other hand, the relative positions of the two high permeability structures 56a and 56b relative to the magnetic power generation element 54 change. By changing the relative positions of the high permeability structures 56a and 56b, at least one of the magnetic flux density and the direction of the magnetic flux near the magnetic power generation element 54 changes, thereby generating electricity.

[0070] In addition, since the high permeability structures 56a and 56b are provided on the disk 52, the relative position change occurs in conjunction with the rotation of the disk 52. That is, this encoder 510 with high permeability structures is an encoder that functions by making the high permeability structure...The high permeability structures 56a and 56b approach and move away from the magnetic field generating parts 53a and 53b and the magnetic power generation element 54, causing a change in the magnetic flux density near the magnetic power generation element 54, thereby generating electricity.

[0071] Industrial Applicability

[0072] Since the encoder of the present invention with a high permeability structure is made of a material with higher toughness than conventional technology, the element that changes position relative to the magnetic power generation element can be improved without surface treatment. Therefore, it is an invention with high industrial applicability in the field of manufacturing and using encoders equipped with magnetic power generation elements and all related fields. Instruction manual, pages 6 / 7, CN 122349611 A

[0073] Explanation of reference numerals

[0074] 1, 31, 51: Substrate

[0075] 2, 32, 52: Disk

[0076] 3, 33a, 33b, 53a, 53b: Magnetic field generating unit

[0077] 4, 34, 54: Magnetic power generation element (Wiegand sensor)

[0078] 5: Magnetic detection element

[0079] 6, 36a, 36b, 56a, 56b: High permeability structure

[0080] 10, 310, 510: Encoder with high permeability structure

[0081] 58: Base

[0082] D: Disk rotation direction

[0083] ML, MR: Magnetic flux applied to the magnetic power generation element (Wiegand sensor)

[0084] MN1, MN2 magnetic flux from the N pole

[0085] MS1, MS2 magnetic flux into the S pole

[0086] NN pole (magnetic field generating parts 36a, 36b)

[0087] SS pole (magnetic field generating parts 36a, 36b)

[0088] 91 Substrate

[0089] 92 Disk

[0090] 93 Magnetic field generating part

[0091] 94 Magnetic power generation element

[0092] 95 Magnetic detection element

[0093] 910 Past encoder instruction manual 7 / 7 pages 9 CN 122349611 A Figure 1 Figure 2 Figure 3 Instruction manual drawings 1 / 6 pages 10 CN 122349611 A Figure 4 Figure 4-2 Figure 5 Instruction manual drawings 2 / 6 pages 11 CN 122349611 A Figure 6 Figure 7 Instruction manual drawings 3 / 6 pages 12 CN 122349611 A Figure 8 Figure 9 Appendix to the Instruction Manual, Page 4 / 6, 13 CN 122349611 A Figure 10 Figure 11 Appendix to the Instruction Manual, Page 5 / 6, 14 CN 122349611 A Figure 12 Appendix to the Instruction Manual, Page 6 / 6, 15 CN122349611 A Abstract The present invention relates to encoder with high permeability structure. To enhance vibration resistance and impact resistance in an encoder equipped with a magnetic power generation element having a large Barkhausen effect. An encoder (10) with a high permeability structure comprises a rotating disk (2), a magnetic field generation part (3), a magnetic power generation element (4) having a large Barkhausen effect, and a magnetic detection element (5). One or a plurality of high permeability structures, viz. high permeability structures (6), are provided so that the relative positions thereof with respect to the magnetic power generation element (4) are changeable. The magnetic field generation part (3) is disposed independently of the disk (2).

Claims

1. An encoder with a high permeability structure, the encoder being equipped with a rotating disk, a magnetic field generating unit, a magnetic power generation element with the large Barkhausen effect, and a magnetic detection element, characterized in that, One or more high-permeability structures, i.e., high-permeability structures, can be arranged with varying relative positions to the magnetic power generation element. The magnetic field generator is configured independently of the disk.

2. The encoder with a high permeability structure as described in claim 1, characterized in that, The high permeability structure rotates with the disk.

3. The encoder with a high permeability structure as described in claim 2, characterized in that, The high permeability structure rotates around the magnetic power generation element.

4. The encoder with a high permeability structure as described in any one of claims 1, 2, and 3, characterized in that, The high permeability structure is formed and configured to form a magnetic circuit between itself and the magnetic field generating unit, and between itself and the magnetic power generation element.

5. The encoder with a high permeability structure as described in any one of claims 1, 2, and 3, characterized in that, The magnetic field generating part is fixedly mounted on a substrate that is a component of this encoder.

6. The encoder with a high permeability structure as described in any one of claims 1, 2, and 3, characterized in that, The high permeability structure is formed of iron, nickel, cobalt, their alloys, and other strongly magnetic materials.

7. The encoder with a high permeability structure as described in any one of claims 1, 2, and 3, characterized in that, By rotating the high permeability structure, at least one of the magnetic flux density and the direction of the magnetic flux near the magnetic power generation element changes, thereby generating electricity by the magnetic power generation element.

8. The encoder with a high permeability structure as described in any one of claims 1, 2, and 3, characterized in that, The magnetic field generating unit is configured to form a magnetic circuit with the magnetic power generation element.

9. The encoder with a high permeability structure as described in any one of claims 1, 2, and 3, characterized in that, The magnetic field generating unit and the magnetic power generation element are disposed on the same substrate.

10. The encoder with a high permeability structure as described in any one of claims 1, 2, and 3, characterized in that, The magnetic field generating unit is configured such that the direction of its magnetic flux is consistent with the direction of the magnetic flux in the magnetic power generation element, and the magnetic power generation element is sandwiched between two locations.

11. The encoder with a high permeability structure as described in any one of claims 1, 2, and 3, characterized in that, Two high-permeability structures are provided within a 180° range on the plane of rotation.

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