Angle sensor for measuring absolute angle and detection method thereof
By designing the snap structure and combining data detection methods, the lubricating grease storage and squirming problems of the angle sensor are solved, and the angle sensor detection with high precision and redundant capabilities is achieved.
Patent Information
- Application Number
- CN202510681749.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-26
- Publication Date
- 2025-08-12
AI Technical Summary
In terms of measurement accuracy, the angle sensor cannot accommodate excess lubricating grease, the rotating parts are prone to squirting, and the lubricating grease contaminates the components, resulting in signal attenuation and sensor damage.
An angle sensor measuring absolute angle is designed, a gear cover is installed with a snap structure, and the lubricating grease is accommodated through the magnetic gear contact piece, and a flexible connector and annular current limiting wall are used to limit the movement, combining eddy current and magnetic angle chip to form a combined data detection.
The self-lubricating function is realized, the rotation accuracy and detection accuracy are improved, the redundancy is enhanced, and the lubricating grease contamination and component damage are avoided.
Smart Images
Figure CN120467174A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of rotation angle sensors, and more particularly to a rotation angle sensor for measuring absolute angles and a detection method thereof. Background Art
[0002] As the core component of precision measuring equipment, the measurement accuracy of the angle sensor directly affects the control performance of the mechanical system.
[0003] At present, there are three main problems with the measurement accuracy of angle sensors: first, the rotating parts of the angle sensor cannot accommodate excess lubricating grease, that is, they cannot provide self-lubricating function during use; second, the rotating parts are prone to axial or radial movement; third, excessive lubrication or grease leakage during equipment operation will contaminate the precision sensor elements. The surface of the sensor element is very sensitive, and grease adhering to the sensor surface will cause signal attenuation. Grease adhering to the sensor pins may cause the sensor to short-circuit and burn.
[0004] Therefore, a rotation angle sensor for measuring absolute angle and a detection method thereof are proposed to solve the above problems. Summary of the Invention
[0005] In view of the shortcomings of the prior art, the present invention aims to provide a rotation angle sensor for measuring absolute angles and a detection method thereof, which improves detection accuracy and overall redundancy.
[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a rotation angle sensor for measuring absolute angle, comprising a housing, a gear cover, an integrated rotor and a driven part, wherein the top of the housing is provided with a magnetic gear receiving area and a rotor mounting slot, and the rotor mounting slot is provided on one side of the magnetic gear receiving area; the gear cover is provided with a cover body and a magnetic gear lubrication assembly, the cover body covers the magnetic gear receiving area and the male buckle, the magnetic gear lubrication assembly is connected to the top of the inner wall of the cover, the magnetic gear lubrication assembly has a magnetic gear contact platform, the magnetic gear contact platform is arranged around the axis of the male buckle, and the inner side of the magnetic gear contact platform is provided with a magnetic gear lubrication assembly. An annular flow limiting wall is provided, and the annular flow limiting wall is arranged around the axis of the male buckle. Two groups of elastic connectors are provided on one side of the magnetic gear lubrication assembly, and the two groups of elastic connectors are respectively arranged on the two end sides of the annular flow limiting wall, and the two groups of elastic connectors are connected to the annular flow limiting wall. A magnetic gear contact piece is connected between the two groups of elastic connectors, and the magnetic gear contact piece is a hollow structure. A support piece is provided on the magnetic gear contact piece near the top of the cover body, and the support piece is connected to the annular flow limiting wall; the integrated rotor is plugged into the rotor mounting slot; the driven part is arranged between the housing and the gear cover.
[0007] By adopting the above technical solution, the snap-fit structure can conveniently install the gear cover, and the groove in the middle of the magnetic gear contact piece can accommodate excess lubricating grease, so that the lubricating grease is concentrated around the magnetic gear contact piece, so that the driven part can rotate smoothly when it rotates. The magnetic gear contact plate and the annular limiting wall are elastically connected, and the elastic connector is composed of a circular arc elastic plate and a straight arm plate. When the gear cover and the housing are fixed by the snap-fit structure, the elastic force of the elastic connector presses the driven part against the magnetic gear storage area to avoid axial movement and improve the rotation accuracy. The annular flow limiting wall can limit the radial displacement of the driven part on the one hand, and on the other hand, it can limit the axial displacement of the magnetic gear contact piece, thereby avoiding excessive squeezing of the elastic connector and the driven part, causing destructive damage and thus losing the elastic function. The support plate can not only improve the strength of the annular flow limiting wall, but also avoid destructive damage to the magnetic gear contact piece and the elastic connector when the annular flow limiting wall is damaged.
[0008] The present invention is further configured as follows: the integrated rotor has a sleeve, a rotor part and a target wheel, the sleeve is a hollow cylindrical structure, the rotor part is arranged on the outside of the sleeve, the rotor part has a rotor gear and an embedded part, the rotor gear is a hollow structure, and the target wheel is arranged inside the embedded part.
[0009] The present invention is further configured as follows: the driven part has a driven gear and a gear lubrication groove, the driven gear is meshed with the rotor gear, the gear lubrication groove is opened at the axis of the driven gear, and the annular flow limiting wall, two sets of elastic connecting parts and the magnetic gear contact piece are all plugged into the inner wall of the gear lubrication groove.
[0010] The present invention is further configured as follows: the top of the shell also has a connector slot, and the connector slot is opened away from the magnetic gear storage area and the rotor mounting slot; the bottom of the shell has a first circuit board mounting slot, a second circuit board mounting slot, a first circuit board connecting column and a second circuit board connecting column; the first circuit board mounting slot and the second circuit board mounting slot are opened along the inner wall of the bottom end of the shell; a group of first chip grooves are respectively opened at both ends of the first circuit board mounting slot, and a group of second chip grooves are respectively opened at both ends of the second circuit board mounting slot; the first circuit board connecting column and the second circuit board connecting column are both arranged to avoid the rotor mounting slot and the connector slot.
[0011] The present invention is further configured as follows: a first support platform is provided on the outer side of the first circuit board connecting column, a third chip groove is formed between the first support platform and the first circuit board connecting column, a second support platform is provided on the outer side of the second circuit board connecting column, a fourth chip groove is formed between the second support platform and the second circuit board connecting column, the shell also has a second baffle wall, the second baffle wall is arranged around the rotor mounting slot, the second baffle wall does not exceed the bottom end surface of the shell, the first baffle wall is provided on the side of the connector slot close to the rotor mounting slot, and the first baffle wall and the second baffle wall form a grease holding area.
[0012] The present invention is further configured as follows: the sleeve has a sleeve body and multiple sets of rotor connecting grooves, the multiple sets of rotor connecting grooves are opened around the axis of the sleeve body, the rotor part also has multiple sets of sleeve connecting bosses and rotor shaft restraint parts, and the multiple sets of sleeve connecting bosses are arranged around the inner wall of the rotor gear.
[0013] The present invention is further configured as follows: the rotor shaft constraint portion is arranged at the top of the embedded portion, the target wheel has an inner ring and multiple groups of tooth-shaped portions, the inner ring is coaxially arranged with the sleeve, the inner ring is an annular structure, and multiple groups of tooth-shaped portions are arranged around the outer wall of the inner ring.
[0014] The present invention is further configured as follows: the driven part also has a driven shaft restraint part and a magnet, the driven shaft restraint part is arranged at the bottom end of the driven gear, the driven shaft restraint part is coaxially arranged with the driven gear, the magnet is arranged at the bottom end of the driven shaft restraint part, and the magnet is coaxially arranged with the driven shaft restraint part.
[0015] The present invention is further configured as follows: the rotation angle sensor also includes a connector, a circuit board and a back cover, the connector is plugged into the connector slot, the back cover is installed at the bottom end of the shell, the circuit board is arranged between the shell and the back cover, the circuit board has a stator coil, multiple groups of eddy current angle chips and multiple groups of magnetic angle chips, the stator coil is coaxially arranged with the target wheel, multiple groups of eddy current angle chips are arranged around the axis of the target wheel, and multiple groups of magnetic angle chips are arranged around the axis of the magnet.
[0016] The present invention is further configured as follows: the stator coil includes multiple groups of receiving coils and multiple groups of exciting coils, the receiving coils are connected to the eddy current angle chip, and the exciting coils are connected to the eddy current angle chip.
[0017] A detection method for a rotation angle sensor for measuring absolute angles, using the rotation angle sensor for measuring absolute angles as described above, comprises the following steps: S1. Turn on the power supply of the circuit board, and multiple sets of excitation coils are energized to generate a magnetic field. The magnetic field penetrates the target wheel to generate eddy currents. S2. The external main shaft rotates, driving the integrated rotor to rotate. The lubricating grease on the outside of the rotor is thrown out. The first baffle wall and the second baffle wall prevent the lubricating grease from flowing to the components of the circuit board. The target wheel in the integrated rotor changes the eddy current distribution to form a periodically changing induction signal. At the same time, the integrated rotor drives the driven part to rotate. The elastic connector and the magnetic gear contact piece press against the top of the driven part. The annular flow restriction wall slides against the inner wall of the gear lubrication groove. The magnet rotates and its magnetic field direction changes to form a magnetic field component. S3, multiple sets of receiving coils receive the induction signal of the target wheel and transmit it to the corresponding eddy current angle chip. At the same time, multiple sets of magnetic angle chips receive the magnetic field component of the magnet; S4, collecting the induction signals of the multiple sets of eddy current angle chips and the magnetic field components of the multiple sets of magnetic angle chips, and making one-to-one correspondence between the multiple sets of induction signals and the multiple sets of magnetic field components to form multiple sets of combined data; S5. Calculate the corresponding absolute angle for each set of combined data according to the cursor algorithm.
[0018] By adopting the above technical solution, multiple groups of eddy current angle chips and multiple groups of magnetic angle chips form one-to-one corresponding combination data. By performing detection through multiple groups of combination data, on the one hand, the data detection accuracy can be improved by comparing the combination data. On the other hand, even if one group of combination data fails, the faulty combination data can be eliminated through comparison and the corresponding eddy current angle chip and magnetic angle chip can be shielded, thereby improving the detection accuracy and overall redundancy capability.
[0019] In summary, this application includes at least one of the following beneficial technical effects: 1. The snap-on structure allows for easy installation of the gear cover, and the groove in the middle of the magnetic gear contact piece holds excess grease to achieve self-lubrication.
[0020] 2. The magnetic gear contact plate is elastically connected to the annular limiting wall, pressing against the magnetic gear to avoid axial movement of the driven part and improve rotation accuracy.
[0021] 3. The annular flow-limiting wall can limit the radial displacement of the driven part on the one hand, and the axial displacement of the magnetic gear contact piece on the other hand, thereby preventing the elastic connector and the driven part from being excessively squeezed, causing destructive damage, and losing elastic function. The support piece can not only improve the strength of the annular flow-limiting wall, but also prevent the magnetic gear contact piece and the elastic connector from being destructive damage when the annular flow-limiting wall is damaged, thereby realizing redundancy function.
[0022] 4. Multiple sets of eddy current angle chips and multiple sets of magnetic angle chips form one-to-one corresponding combination data. Detection is performed using multiple sets of combination data. On the one hand, the data detection accuracy can be improved by comparing the combination data. On the other hand, even if one set of combination data fails, detection can continue through the redundant eddy current angle chip and magnetic angle chip, thereby improving the overall redundancy capability. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 This is a structural schematic diagram of a rotation angle sensor for measuring absolute angles according to the present invention; Figure 2 for Figure 1 Explosion diagram of Figure 3 Schematic diagram of the structure of the shell in the present invention; Figure 4 for Figure 3 Structural diagram from another perspective; Figure 5 Schematic diagram of the structure of the gear cover in the present invention; Figure 6 Schematic diagram of the structure of the integrated rotor in the present invention; Figure 7 Schematic diagram of an explosion of the integrated rotor in the present invention; Figure 8 This is a schematic diagram of the structure of the integrated rotor, driven part and circuit board in the present invention; Figure 9 Schematic diagram of the explosion of the stator coil and the target wheel in the present invention; Figure 10 It is a schematic structural diagram of the circuit board and the back cover in the present invention; Explanation of reference numerals: 1. housing; 11. magnetic gear storage area; 12. male buckle; 13. rotor mounting slot; 14. connector slot; 141. first baffle wall; 15. first circuit board mounting slot; 151. first chip groove; 16. second circuit board mounting slot; 161. second chip groove; 17. first circuit board connecting post; 171. first support platform; 172. third chip groove; 18. second circuit board connecting post; 181. second support platform; 182. fourth chip groove; 19. second baffle wall; 2. gear cover; 21. cover body; 22. magnetic gear lubrication assembly; 221. magnetic gear contact platform; 222. annular flow restriction wall; 223. elastic connector; 224. Magnetic gear contact piece; 225. Support piece; 23. Female buckle; 3. Connector; 4. Integrated rotor; 41. Sleeve; 411. Sleeve body; 412. Rotor connecting groove; 42. Rotor part; 421. Rotor gear; 422. Sleeve connecting boss; 423. Rotor shaft restraint part; 424. Embedded part; 43. Target wheel; 431. Inner ring; 432. Toothed part; 5. Driven part; 51. Driven gear; 52. Gear lubrication groove; 53. Driven shaft restraint part; 54. Magnet; 6. Circuit board; 61. Stator coil; 611. Receiving coil; 612. Excitation coil; 62. Eddy current angle chip; 63. Magnetic angle chip; 7. Back cover. DETAILED DESCRIPTION
[0024] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.
[0025] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by ordinary technicians in the technical field to which this application belongs.
[0026] See also Figure 1-10 , the present invention provides the following technical solutions: Example 1, see Figure 1-2 A rotation angle sensor for measuring absolute angle includes a shell 1, a gear cover 2, a connector 3, an integrated rotor 4, a driven part 5, a circuit board 6 and a back cover 7. The gear cover 2 and the connector 3 are installed above the shell 1. The shell 1 provides an installation environment. The gear cover 2 is used to cover the driven part 5 and provide self-lubrication function. The connector 3 is connected to the circuit board 6 to provide power and signal transmission. An integrated rotor 4 is installed on one side of the shell 1. The integrated rotor 4 is used to connect to an external main shaft. The driven part 5 is arranged between the shell 1 and the gear cover 2. The driven part 5 is used as a tested mechanism for auxiliary detection. The back cover 7 is installed under the shell 1. The back cover 7 is used to protect the internal circuit board 6. The circuit board 6 is arranged between the shell 1 and the back cover 7. The circuit board 6 is used for detection, connecting power and transmitting signals.
[0027] See Figure 3-4 The top of the shell 1 has a magnetic gear storage area 11, multiple groups of male buckles 12, a rotor mounting groove 13 and a connector slot 14, and the bottom of the shell 1 has a first circuit board mounting groove 15, a second circuit board mounting groove 16, a first circuit board connecting column 17, a second circuit board connecting column 18 and a second baffle wall 19. Multiple groups of male buckles 12 are arranged around the axis of the magnetic gear storage area 11, the rotor mounting groove 13 is opened on one side of the magnetic gear storage area 11, and the connector slot 14 is opened away from the magnetic gear storage area 11 and the rotor mounting groove 13. The first circuit board mounting groove 15 and the second circuit board mounting groove 16 are opened along the inner wall of the bottom end of the shell 1, and a group of first chip grooves 151 are respectively opened at both ends of the first circuit board mounting groove 15, and a group of second chip grooves 151 are respectively opened at both ends of the second circuit board mounting groove 16. The chip groove 161, the first circuit board connecting column 17 and the second circuit board connecting column 18 are all arranged to avoid the rotor mounting groove 13 and the connector slot 14. A first support platform 171 is provided on the outer side of the first circuit board connecting column 17, and a third chip groove 172 is formed between the first support platform 171 and the first circuit board connecting column 17. A second support platform 181 is provided on the outer side of the second circuit board connecting column 18, and a fourth chip groove 182 is formed between the second support platform 181 and the second circuit board connecting column 18. The second baffle wall 19 is arranged around the rotor mounting groove 13, and the second baffle wall 19 is arranged so as not to exceed the bottom end surface of the housing 1. A first baffle wall 141 is provided on the side of the connector slot 14 close to the rotor mounting groove 13. The first baffle wall 141 and the second baffle wall 19 form a grease containing area. Specifically, the grease containing area surrounded by the first baffle wall 141 and the second baffle wall 19 prevents the lubricating grease of the integrated rotor 4 from overflowing and flowing toward the electronic components on the circuit board 6. The first chip groove 151, the second chip groove 161, the first support platform 171 and the second support platform 181 can accommodate chips generated by interference fit, thereby assisting the installation of the circuit board 6.
[0028] See Figure 5The gear cover 2 has a cover body 21, a magnetic gear lubrication assembly 22 and multiple sets of female buckles 23. The cover body 21 covers the magnetic gear storage area 11 and the male buckle 12. The magnetic gear lubrication assembly 22 is connected to the top of the inner wall of the cover body 21. The magnetic gear lubrication assembly 22 has a magnetic gear contact platform 221. The magnetic gear contact platform 221 is arranged around the axis of the male buckle 12. An annular flow limiting wall 222 is arranged on the inner side of the magnetic gear contact platform 221. The annular flow limiting wall 222 is arranged around the axis of the male buckle 12. The magnetic gear lubrication assembly 22 is arranged on one side. There are two groups of elastic connectors 223, which are respectively arranged on both ends of the annular flow-limiting wall 222, and the two groups of elastic connectors 223 are connected to the annular flow-limiting wall 222. A magnetic gear contact piece 224 is connected between the two groups of elastic connectors 223. The magnetic gear contact piece 224 is a hollow structure. A support piece 225 is provided near the top of the cover body 21 of the magnetic gear contact piece 224. The support piece 225 is connected to the annular flow-limiting wall 222. Multiple groups of female buckles 23 are buckled and connected with multiple groups of male buckles 12. Specifically, the gear cover 2 can be conveniently installed through the snap-fit structure of multiple sets of female buckles 23 and multiple sets of male buckles 12. The groove in the middle of the magnetic gear contact piece 224 can accommodate excess lubricating grease, so that the lubricating grease is concentrated around the magnetic gear contact piece 224, and can rotate smoothly when the driven part 5 rotates. The magnetic gear contact plate is elastically connected to the annular limiting wall, and the elastic connecting member 223 is a combination of an arc-shaped elastic plate and a straight arm plate. When the gear cover 2 and the housing 1 are fixed by the snap-fit structure, the elastic force of the elastic connecting member 223 presses the driven part 5 against the magnetic gear In the storage area 11, axial movement is avoided and rotation accuracy is improved. The annular flow-limiting wall 222 can limit the radial displacement of the driven part 5 on the one hand, and on the other hand, it can limit the axial displacement of the magnetic gear contact piece 224, avoiding excessive squeezing of the elastic connecting piece 223 and the driven part 5, causing destructive damage and thus losing the elastic function. The support piece 225 can not only improve the strength of the annular flow-limiting wall 222, but also avoid destructive damage to the elastic connection between the magnetic gear contact piece 224 and the elastic connecting piece 223 when the annular flow-limiting wall 222 is damaged.
[0029] See Figure 6-8The integrated rotor 4 is plugged into the rotor mounting groove 13. The integrated rotor 4 has a sleeve 41, a rotor part 42 and a target wheel 43. The sleeve 41 is a hollow cylindrical structure. The rotor part 42 is arranged on the outside of the sleeve 41. The rotor part 42 has a rotor gear 421 and an embedded part 424. The rotor gear 421 is a hollow structure. The target wheel 43 is arranged inside the embedded part 424. The sleeve 41 has a sleeve body 411 and multiple sets of rotor connecting grooves 412. The multiple sets of rotor connecting grooves 412 are opened around the axis of the sleeve body 411. The rotor part 42 also has multiple sets of sleeve connecting bosses 422 and rotor shaft constraining parts 423. The multiple sets of sleeve connecting bosses 422 are arranged around the inner wall of the rotor gear 421. The rotor shaft constraining part 423 is arranged at the top of the embedded part 424. The target wheel 43 has an inner ring 43 1 and multiple groups of tooth-shaped portions 432, the inner ring 431 is coaxially arranged with the sleeve 41, the inner ring 431 is an annular structure, and the multiple groups of tooth-shaped portions 432 are arranged around the outer wall of the inner ring 431; the driven part 5 has a driven gear 51 and a gear lubrication groove 52, the driven gear 51 is meshed with the rotor gear 421, the gear lubrication groove 52 is opened at the axis of the driven gear 51, the annular flow limiting wall 222, the two groups of elastic connecting members 223 and the magnetic gear contact piece 224 are all plugged into the inner wall of the gear lubrication groove 52; the driven part 5 also has a driven shaft constraint portion 53 and a magnet 54, the driven shaft constraint portion 53 is arranged at the bottom end of the driven gear 51, the driven shaft constraint portion 53 is coaxially arranged with the driven gear 51, the magnet 54 is arranged at the bottom end of the driven shaft constraint portion 53, and the magnet 54 is coaxially arranged with the driven shaft constraint portion 53; Specifically, the rotor gear 421 and the driven gear 51 are made of plastic, and the target wheel 43 is made of metal. The target wheel 43 has a tooth-shaped structure. When the magnetic field penetrates the inner ring 431, eddy currents are generated. The integrated rotor 4 rotates the inner ring 431 to change the eddy current distribution, forming a periodically changing induction signal; the magnet 54 is a permanent magnet, and the integrated rotor 4 drives the driven part 5 to rotate. Through the rotation of the magnet 54, the direction of its magnetic field changes accordingly, and the changed magnetic field direction has a magnetic field component; the absolute angle can be obtained through subsequent detection and conversion of the induction signal and the magnetic field component.
[0030] See Figure 9-10 The circuit board 6 has a stator coil 61, multiple groups of eddy current angle chips 62 and multiple groups of magnetic angle chips 63. The stator coil 61 is coaxially arranged with the target wheel 43, the multiple groups of eddy current angle chips 62 are arranged around the axis of the target wheel 43, and the multiple groups of magnetic angle chips 63 are arranged around the axis of the magnet 54; the stator coil 61 includes multiple groups of receiving coils 611 and multiple groups of exciting coils 612. The receiving coil 611 is connected to the eddy current angle chip 62, and the exciting coil 612 is connected to the eddy current angle chip 62.
[0031] Embodiment 2, a detection method of a rotation angle sensor for measuring absolute angle, using the above-mentioned rotation angle sensor for measuring absolute angle, comprises the following steps: S1. Turn on the power supply assembly of the circuit board 6, and the multiple sets of excitation coils 612 are energized to generate a magnetic field, which penetrates the target wheel 43 to generate eddy currents; S2. The external main shaft rotates, driving the integrated rotor 4 to rotate. The lubricating grease on the outside of the rotor part 42 is thrown out. The first baffle wall 141 and the second baffle wall 19 prevent the lubricating grease from flowing to the components of the circuit board 6. The target wheel 43 in the integrated rotor 4 changes the eddy current distribution to form a periodically changing induction signal. At the same time, the integrated rotor 4 drives the driven part 5 to rotate. The elastic connector 223 and the magnetic gear contact piece 224 press against the top of the driven part 5. The annular flow restriction wall 222 slides against the inner wall of the gear lubrication groove 52. The magnet 54 rotates and its magnetic field direction changes to form a magnetic field component. S3, multiple sets of receiving coils 611 receive the induction signal of the target wheel 43 and transmit it to the corresponding eddy current angle chip 62. At the same time, multiple sets of magnetic angle chips 63 receive the magnetic field component of the magnet 54; S4, collecting the induction signals of multiple groups of eddy current angle chips 62 and the magnetic field components of multiple groups of magnetic angle chips 63, and making one-to-one correspondence between the multiple groups of induction signals and the multiple groups of magnetic field components to form multiple groups of combined data; S5. Calculate the corresponding absolute angle for each set of combined data according to the cursor algorithm; the absolute angle may have a range greater than 360°.
[0032] One-to-one corresponding combination data is formed by multiple groups of eddy current angle chips 62 and multiple groups of magnetic angle chips 63. By performing detection through multiple groups of combination data, on the one hand, the data detection accuracy can be improved by comparing the combination data. On the other hand, even if one group of combination data fails, detection can continue through the redundant eddy current angle chip 62 and magnetic angle chip 63, thereby improving the overall redundancy capability.
[0033] Obviously, the embodiments described above are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.
Claims
1. A rotation angle sensor for measuring absolute angles, characterized in that: include: A housing (1), wherein the top of the housing (1) is provided with a magnetic gear receiving area (11) and a rotor mounting groove (13), and the rotor mounting groove (13) is provided on one side of the magnetic gear receiving area (11); A gear cover (2), wherein the gear cover (2) comprises a cover body (21) and a magnetic gear lubrication assembly (22), wherein the cover body (21) covers the magnetic gear storage area (11), and the magnetic gear lubrication assembly (22) is connected to the top of the inner wall of the cover body (21), and the magnetic gear lubrication assembly (22) comprises a magnetic gear contact platform (221), wherein the magnetic gear contact platform (221) is arranged around the axis of the magnetic gear storage area (11), and an annular flow limiting wall (222) is arranged on the inner side of the magnetic gear contact platform (221), and the annular flow limiting wall (222) is arranged around the axis of the magnetic gear storage area (11). Two groups of elastic connectors (223) are provided on one side of the magnetic gear lubrication assembly (22), the two groups of elastic connectors (223) are respectively provided on both end sides of the annular flow limiting wall (222), and the two groups of elastic connectors (223) are connected to the annular flow limiting wall (222), and a magnetic gear contact piece (224) is connected between the two groups of elastic connectors (223), the magnetic gear contact piece (224) is a hollow structure, and a support piece (225) is provided on the magnetic gear contact piece (224) near the top of the cover body (21), and the support piece (225) is connected to the annular flow limiting wall (222); An integrated rotor (4), the integrated rotor (4) being plugged into the rotor mounting slot (13); and A driven part (5), the driven part (5) being arranged between the housing (1) and the gear cover (2).
2. The rotation angle sensor for measuring absolute angle according to claim 1, characterized in that: The integrated rotor (4) comprises a sleeve (41), a rotor portion (42), and a target wheel (43); the sleeve (41) is a hollow cylindrical structure; the rotor portion (42) is arranged outside the sleeve (41); the rotor portion (42) comprises a rotor gear (421) and an embedded portion (424); the rotor gear (421) is a hollow structure; and the target wheel (43) is arranged inside the embedded portion (424).
3. The rotation angle sensor for measuring absolute angle according to claim 2, characterized in that: The driven part (5) comprises a driven gear (51) and a gear lubrication groove (52), wherein the driven gear (51) is meshed with the rotor gear (421), the gear lubrication groove (52) is opened at the axis of the driven gear (51), and the annular flow limiting wall (222), the two sets of elastic connecting members (223) and the magnetic gear contact piece (224) are all plugged into the inner wall of the gear lubrication groove (52).
4. The rotation angle sensor for measuring absolute angle according to claim 3, characterized in that: The top of the shell (1) also has a connector slot (14), and the connector slot (14) is opened away from the magnetic gear storage area (11) and the rotor mounting slot (13). The bottom of the shell (1) has a first circuit board mounting slot (15), a second circuit board mounting slot (16), a first circuit board connecting column (17) and a second circuit board connecting column (18). The first circuit board mounting slot (15) and the second circuit board mounting slot (16) are opened along the inner wall of the bottom end of the shell (1). A group of first chip grooves (151) are respectively opened at both ends of the first circuit board mounting slot (15), and a group of second chip grooves (161) are respectively opened at both ends of the second circuit board mounting slot (16). The first circuit board connecting column (17) and the second circuit board connecting column (18) are both set away from the rotor mounting slot (13) and the connector slot (14).
5. The rotation angle sensor for measuring absolute angle according to claim 4, characterized in that: A first support platform (171) is provided on the outer side of the first circuit board connecting column (17), and a third chip groove (172) is formed between the first support platform (171) and the first circuit board connecting column (17). A second support platform (181) is provided on the outer side of the second circuit board connecting column (18), and a fourth chip groove (182) is formed between the second support platform (181) and the second circuit board connecting column (18). The housing (1) further comprises a second baffle wall (19), which is arranged around the rotor mounting slot (13) and does not extend beyond the bottom end surface of the housing (1). A first baffle wall (141) is provided on the side of the connector slot (14) close to the rotor mounting slot (13), and the first baffle wall (141) and the second baffle wall (19) form a grease receiving area.
6. The rotation angle sensor for measuring absolute angle according to claim 2, characterized in that: The sleeve (41) has a sleeve body (411) and multiple groups of rotor connecting grooves (412), and the multiple groups of rotor connecting grooves (412) are opened around the axis of the sleeve body (411). The rotor part (42) also has multiple groups of sleeve connecting bosses (422) and rotor shaft restraining parts (423). The multiple groups of sleeve connecting bosses (422) are arranged around the inner wall of the rotor gear (421), and the rotor shaft restraining part (423) is arranged at the top of the embedded part (424). The target wheel (43) has an inner ring (431) and multiple groups of tooth-shaped parts (432). The inner ring (431) is coaxially arranged with the sleeve (41), and the inner ring (431) is an annular structure. The multiple groups of tooth-shaped parts (432) are arranged around the outer wall of the inner ring (431).
7. The rotation angle sensor for measuring absolute angle according to claim 5, characterized in that: The driven part (5) further comprises a driven shaft restraining part (53) and a magnet (54), wherein the driven shaft restraining part (53) is arranged at the bottom end of the driven gear (51), and the driven shaft restraining part (53) is coaxially arranged with the driven gear (51), and the magnet (54) is arranged at the bottom end of the driven shaft restraining part (53), and the magnet (54) is coaxially arranged with the driven shaft restraining part (53).
8. The rotation angle sensor for measuring absolute angle according to claim 7, characterized in that: The rotation angle sensor further comprises a connector (3), a circuit board (6) and a back cover (7), wherein the connector (3) is plugged into the connector slot (14), the back cover (7) is mounted at the bottom end of the housing (1), the circuit board (6) is arranged between the housing (1) and the back cover (7), the circuit board (6) comprises a stator coil (61), a plurality of groups of eddy current angle chips (62) and a plurality of groups of magnetic angle chips (63), the stator coil (61) is coaxially arranged with the target wheel (43), the plurality of groups of eddy current angle chips (62) are arranged around the axis of the target wheel (43), and the plurality of groups of magnetic angle chips (63) are arranged around the axis of the magnet (54).
9. The rotation angle sensor for measuring absolute angle according to claim 8, characterized in that: The stator coil (61) comprises multiple groups of receiving coils (611) and multiple groups of exciting coils (612); the receiving coils (611) are connected to the eddy current angle chip (62); and the exciting coils (612) are connected to the eddy current angle chip (62).
10. A detection method for a rotation angle sensor for measuring absolute angles, using the rotation angle sensor for measuring absolute angles according to claim 9, characterized in that: The following steps are involved: S1, connecting the power supply assembly of the circuit board (6), the multiple sets of excitation coils (612) are energized to generate a magnetic field, and the magnetic field penetrates the target wheel (43) to generate eddy currents; S2, the external main shaft rotates to drive the integrated rotor (4) to rotate, the lubricating grease on the outer side of the rotor part (42) is thrown out, the first baffle wall (141) and the second baffle wall (19) block the lubricating grease from flowing to the components of the circuit board (6), the target wheel (43) in the integrated rotor (4) changes the eddy current distribution to form a periodically changing induction signal, and at the same time, the integrated rotor (4) drives the driven part (5) to rotate, the elastic connecting part (223) and the magnetic gear contact piece (224) press against the top of the driven part (5), the annular flow limiting wall (222) slides against the inner wall of the gear lubrication groove (52), and the magnet (54) rotates to change the direction of its magnetic field to form a magnetic field component; S3, multiple sets of receiving coils (611) receive the induction signal of the target wheel (43) and transmit it to the corresponding eddy current angle chip (62), and at the same time, multiple sets of magnetic angle chips (63) receive the magnetic field component of the magnet (54); S4, collecting the induction signals of the multiple sets of eddy current angle chips (62) and the magnetic field components of the multiple sets of magnetic angle chips (63), and making one-to-one correspondence between the multiple sets of induction signals and the multiple sets of magnetic field components to form multiple sets of combined data; S5. Calculate the corresponding absolute angle for each set of combined data according to the cursor algorithm.