Signal sensor magnet and magnetizing device applicable to same

Abstract

The invention relates to a signal sensor magnet and a magnetizing device suitable for the same, and relates to the technical field of permanent magnet magnetizing equipment.The signal sensor magnet comprises back iron and a permanent magnet which are connected, and the permanent magnet is formed on the surface of one side of the back iron in an injection molding mode; a single plane of the permanent magnet is provided with four magnetic poles, namely a first magnetic pole, a second magnetic pole, a third magnetic pole and a fourth magnetic pole, and every two adjacent magnetic poles are opposite in magnetism. According to the invention, the stability and precision of the signal sensor magnet are improved.

Description

Technical Field

[0001] This application relates to the field of permanent magnet magnetization equipment technology, and in particular to a signal sensor magnet and a magnetization device suitable for the magnet. Background Technology

[0002] The sensor magnet inside the motorcycle throttle lever is a crucial component of the electronic throttle system. It transmits signals indicating the magnitude and speed of throttle rotation. These signals are received and interpreted by the electronic control unit (ECU), which then issues control commands to adjust the throttle opening, thus meeting the driver's control needs. Achieving precise and smooth throttle control requires strict control over the magnet's air gap size and the deviation of its magnetic pole position angle. Existing motorcycle throttle lever sensor magnets often suffer from inconsistent magnetization precision, making it difficult to control fluctuations in the magnetic pole position angle, resulting in uneven acceleration and negatively impacting the overall user experience. Summary of the Invention

[0003] In order to solve the problem that existing signal sensor magnets are often difficult to control due to magnetization accuracy issues, resulting in poor stability and low accuracy, this application provides a signal sensor magnet and a magnetization device suitable for the magnet.

[0004] The signal sensor magnet and magnetization device applicable to the magnet provided in this application adopt the following technical solution: A signal sensor magnet includes a back iron and a permanent magnet connected to each other. The permanent magnet is injection molded on one side surface of the back iron. The permanent magnet has four magnetic poles arranged on a single plane, namely a first magnetic pole, a second magnetic pole, a third magnetic pole and a fourth magnetic pole. The magnetic properties of two adjacent magnetic poles are opposite. Positioning holes are provided at both ends of the back iron.

[0005] By adopting the above technical solution, the permanent magnet is injection molded onto the back iron, which makes the structural strength of the connection between the back iron and the permanent magnet higher. The purpose of setting NS pairs at both ends of the permanent magnet is to stabilize the magnetic field in the working area within the middle range.

[0006] Optionally, the back iron is provided with at least one connection hole, and the permanent magnet is injection molded to form a snap-fit ​​point that penetrates and is fixed inside the connection hole.

[0007] By adopting the above technical solution, the connection holes and reverse snap points make the structural strength of the connection between the back iron and the permanent magnet higher.

[0008] Optionally, the permanent magnet is configured to be arc-shaped, with the arc angle between the second magnetic pole and the third magnetic pole being 45-50 degrees, and the arc angle between the first magnetic pole and the fourth magnetic pole being 15-20 degrees.

[0009] By adopting the above technical solution, with the center line as the angle of 0°, the magnetic sensing range of the signal sensor magnet is ±45°, and the NS pair at both ends is designed with a 20° angle to stabilize the magnetic field in the working area within a range of ±50°.

[0010] Optionally, the permanent magnet is made by granulation and injection molding using original magnetic powder with a maximum magnetic energy product (BH)max of 10.5M and a ratio of magnetic powder to binder of 100:23.

[0011] By adopting the above technical solution, the magnetic field strengths obtained after magnetization are 1.1 mmBz = 78 mT and 3.1 mmBz = 45 mT.

[0012] A magnetizing device includes a base, an iron pole is disposed on one side of the base, at least four pole heads are disposed in the middle of the upper surface of the iron pole, the pole heads are evenly spaced along an arc, the cross-section of the pole heads is fan-shaped, a wire connector electrically connected to the pole heads is disposed on one side of the iron pole, and a pressure plate is disposed above the iron pole, the middle of the pressure plate having a slot adapted to the shape of the sensor magnet corresponding to the pole heads. By adopting the above technical solution...

[0013] By adopting the above technical solution, when magnetizing the signal sensor magnet, the permanent magnet on the signal sensor magnet is placed face down in the slot in the middle of the pressure plate. After the signal sensor magnet enters the slot, the permanent magnet contacts the pole head. Power is supplied to the pole head through the wire connector to magnetize the permanent magnet. After magnetization is completed, the signal sensor magnet is removed from the slot.

[0014] Optionally, a copper wire is wound around the outside of the electrode head, and the copper wire portion is vacuum-sealed and cured with adhesive.

[0015] By adopting the above technical solution, a copper wire is wound around the outside of the electrode head to generate a magnetic field when energized. The copper wire part is vacuum-sealed and cured with glue to prevent the copper wire from oxidizing.

[0016] Optionally, a sealing plate is connected to the bottom surface of the electrode, a sealing gasket is provided at the connection between the sealing plate and the electrode, a cooling cavity is formed between the bottom surface of the electrode and the sealing plate, and at least two pipe interfaces communicating with the cooling cavity are provided on one side of the electrode.

[0017] By adopting the above technical solution, during the magnetization process, cooling water is injected into the cooling chamber through one of the pipe interfaces, and the cooling water is discharged from the other pipe interface through the cooling chamber. The cooling water circulates in the cooling chamber to cool the electrode head and prevent the electrode head temperature from becoming too high.

[0018] Optionally, the bottom surface of the pole iron is connected to the base via side plates on both sides. A lifting mechanism is provided below the pole iron. The lifting mechanism includes a lifting seat that is movably disposed below the pole iron. A top rod is provided above the lifting seat corresponding to the pole head. A through hole is provided on the pole head corresponding to the top rod. The top rod passes through the through hole and moves freely up and down along the through hole.

[0019] By adopting the above technical solution, after the signal sensor magnet is magnetized, it is difficult to remove because of its magnetic force. By driving the lifting seat to move upward, the push rod moves upward along the through hole on the pole head to push out the magnetized signal sensor magnet, making it easy for the operator to remove the signal sensor magnet.

[0020] Optionally, a cylinder is provided below the lifting seat to drive the lifting seat to move up and down repeatedly, and a pneumatic valve is provided on one side of the pole iron, the pneumatic valve being connected to the cylinder through a pipeline.

[0021] By adopting the above technical solution, the lifting seat is driven to rise and fall by a cylinder controlled by a pneumatic valve, so as to facilitate the removal of the magnet of the signal sensor.

[0022] Optionally, the pole head is provided with an insertion hole corresponding to the positioning hole on the back iron.

[0023] By adopting the above technical solution, a positioning rod is inserted inside the socket. The socket and positioning rod facilitate the positioning of the signal sensor magnet and prevent the signal sensor magnet from being placed incorrectly.

[0024] In summary, this application includes at least one of the following beneficial technical effects: 1. In this application, the permanent magnet is magnetized by a single-plane four pole, and a 20° N-S pole pair is set at both ends of the permanent magnet to stabilize the magnetic field in the middle working area, which effectively improves the stability and accuracy of the signal sensor magnet; 2. The magnetization device in this application has four poles inside, which are evenly spaced along an arc. A pressure plate is set above the poles, and a slot is opened on the pressure plate to position the signal sensor magnet. This achieves precise positioning of the signal sensor magnet, improves the magnetization accuracy of the signal sensor magnet, and achieves precise control of the magnetic poles, thereby improving the accuracy of the signal sensor magnet. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of a signal sensor magnet in an embodiment of this application.

[0026] Figure 2 This is a schematic diagram of the magnetic pole distribution of a signal sensor magnet in an embodiment of this application.

[0027] Figure 3This is a schematic diagram of the overall structure of the magnetizing device in the embodiments of this application.

[0028] Figure 4 This is a top view of the magnetization device in an embodiment of this application.

[0029] Figure 5 This is a front view schematic diagram of the internal structure of the magnetizing device in the embodiments of this application.

[0030] Figure 6 This is a schematic diagram of the overall structure of the pole iron of the magnetizing device in the embodiments of this application.

[0031] Figure 7 This is a top view of the pole iron structure of the magnetizing device in the embodiments of this application.

[0032] Figure 8 This is a schematic diagram of the internal structure of the pole iron of the magnetizing device in the embodiments of this application.

[0033] Figure 9 This is a schematic diagram of the bottom structure of the magnetizing device in the embodiments of this application.

[0034] Figure 10 This is a schematic diagram of the lifting mechanism of the magnetizing device in the embodiments of this application.

[0035] Explanation of reference numerals in the attached diagram: 1. Signal sensor magnet; 11. Back iron; 12. Permanent magnet; 13. Positioning hole; 14. Reverse snap point; 15. Connection hole; 16. First magnetic pole; 17. Second magnetic pole; 18. Third magnetic pole; 19. Fourth magnetic pole; 2. Junction box; 3. Base; 4. Pressure plate; 41. Slot; 5. Pole iron; 51. Pole head; 52. Wire connector; 53. Socket; 54. Through hole; 55. Cooling chamber; 56. Pipe interface; 57. Sealing plate; 58. Sealing gasket; 6. Lifting mechanism; 61. Lifting seat; 62. Top rod; 63. Guide column; 64. Cylinder; 7. Side plate; 8. Pneumatic valve. Detailed Implementation

[0036] The following specific embodiments illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification.

[0037] Please see Figure 1-10It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding. They are not intended to limit the scope of this application and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of this application, should still fall within the scope of the technical content disclosed in this application. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of this application. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this application's implementation.

[0038] The following is in conjunction with the appendix Figure 1-10 This application will be described in further detail.

[0039] Reference Figure 1 and Figure 2 A signal sensor magnet includes a back iron 11 and a permanent magnet 12. The back iron 11 has positioning holes 13 at both ends and two connecting holes 15 in the middle. The back iron 11 is formed by stamping. The permanent magnet 12 is made of original magnetic powder with a maximum magnetic energy product (BH)max of 10.5M. It is granulated and injection molded on one side of the back iron 11 with a ratio of magnetic powder to binder of 100:23. During the injection molding process, the back iron 11 is positioned and implanted into the injection mold through the two connecting holes 15. During the injection molding process, part of the permanent magnet is formed inside the connecting holes 15 to form a snap-fit ​​point 14 to tightly connect the permanent magnet 12 and the back iron 11. The back iron 11 and the permanent magnet 12 are arc-shaped, with the arc angle of the permanent magnet 12 being 70°. The permanent magnet 12 forms four magnetic poles through magnetization, namely the first magnetic pole 16, the second magnetic pole 17, the third magnetic pole 18, and the fourth magnetic pole 19. Among them, the first magnetic pole 16 and the third magnetic pole 18 are N poles, and the second magnetic pole 17 and the fourth magnetic pole 19 are S poles. The arc angle between the first magnetic pole 16 and the fourth magnetic pole 19 is 20°, and the arc angle between the second magnetic pole 17 and the third magnetic pole 18 is 50°. Thus, the signal sensor magnet 1 has a sensing range of ±45° with the center line as the angle of 0°. The 20° N-S pair at both ends of the signal sensor magnet 1 is designed to stabilize the magnetic field in the working area within the ±50° range. After being magnetized, the signal sensor magnet 1 achieves magnetic field strengths of 1.1 mmBz = 78 mT and 3.1 mmBz = 45 mT.

[0040] Reference Figure 3 , Figure 4 and Figure 5A magnetizing device includes a base 3, an iron pole 5 is provided on the upper side of one side of the base 3, the bottom sides of the iron pole 5 are connected to the base 3 through side plates 7, a pressure plate 4 is provided on the upper side of the iron pole 5, the pressure plate 4 has a slot 41 for placing a signal sensor magnet 1, a lifting mechanism 6 is provided below the iron pole 5, a pneumatic valve 8 for controlling the operation of the lifting mechanism 6 is provided on the outer side of the side plate 7, and a junction box 2 is provided on the other side of the base 3, and the iron pole 5 is electrically connected to the junction box 2 through two wire connectors 52. Reference Figure 6 and Figure 7 The top of the pole piece 5 has an inwardly recessed groove in the center, inside which are four pole heads 51. The four pole heads 51 are evenly spaced in an arc shape, and are designed as a fan-shaped structure with an included angle of 50°. The distance between two adjacent pole heads 51 is designed to be 12.4mm, and the included angle between the center lines of two adjacent pole heads 51 is 50°. Copper wire is wound around the outer side of each of the four pole heads 51, with a winding depth of 10mm. The wire is made of 2mm diameter copper wire wound with 30 turns per pole. The copper wire layout is smooth and even, avoiding wire defects. A large gap is generated between the diameters. After the winding is completed, the winding part is vacuum-sealed and cured with glue. The copper wires on the outside of the pole head 51 are electrically connected to two wire connectors 52 respectively. The copper wires on the outside of the two pole heads 51 that are spaced apart are connected to the same wire connector 52. The two pole heads 51 located on the first and last sides are provided with insertion holes 53 corresponding to the positioning holes 13 at both ends of the back iron 11. The insertion holes 53 are used to insert positioning rods, so that when the signal sensor magnet 1 is loaded, it cooperates with the positioning holes 13 at both ends of the back iron 11 to accurately position the signal sensor magnet 1. Reference Figure 8 and Figure 9 A sealing plate 57 is connected to the bottom surface of the pole iron 5. A sealing gasket 58 is provided at the connection between the sealing plate 57 and the bottom surface of the pole iron 5. A cooling chamber 55 is formed between the bottom surface of the pole iron 5 and the sealing plate 57. Two pipe interfaces 56 are provided on one side of the pole iron 5. The two pipe interfaces 56 are connected to the cooling chamber 55. During the magnetization process, cooling water enters the cooling chamber 55 from the pipe interface 56 on one side and then exits from the pipe interface 56 on the other side. The cooling water circulates in the cooling chamber 55 to cool the pole iron 5 and the pole head 51. Reference Figure 5 , Figure 7 and Figure 10A lifting mechanism 6 is installed below the pole iron 5. The lifting mechanism 6 includes a cylinder 64. A pneumatic valve 8 is installed on one side of the side plate 7. The pneumatic valve 8 is connected to the cylinder 64 through a pipeline. The lower end of the cylinder 64 is fixedly connected to the base 3. A lifting seat 61 is installed above the cylinder 64. The piston rod in the cylinder 64 is connected to the lifting seat 61. Guide columns 63 are installed on both sides of the cylinder 64. The lifting seat 61 is movably sleeved on the guide columns 63. The lifting seat 61 is provided with upwardly extending push rods 62 corresponding to the four pole heads 51. An opening is provided in the middle of the pole head 51. There is a through hole 54, and the push rod 62 passes through the through hole 54. After the signal sensor magnet 1 is magnetized, the operator controls the cylinder 64 to run through the pneumatic valve 8. The cylinder 64 drives the lifting seat 61 to move upward along the guide column 63. The push rod 62 moves upward inside the through hole 54. After the push rod 62 passes through the through hole 54, it lifts the signal sensor magnet 1 above the pole head 51 upward, so that the signal sensor magnet 1 is disengaged from the slot 41 on the pressure plate 4, which makes it easy for the operator to remove the magnetized signal sensor magnet 1.

[0041] The implementation principle of the magnetization device in this embodiment is as follows: During the magnetization operation, a positioning rod is inserted into the insertion hole 53 on the pole head 51. The positioning holes 13 at both ends of the back iron 11 in the signal sensor magnet 1 are aligned with the positioning rod. The permanent magnet 12 is then placed face down in the slot 41 on the pressure plate 4. The positioning rod inside the insertion hole 53 is then pulled out. During magnetization, a voltage of 1000V, a capacitor of 1000uf, and a current of approximately 3KA are used. A magnetic field is generated around the pole head 51 through a copper wire. The magnetic field generated by the pole head 51 is used to magnetize the permanent magnet 12. After magnetization is completed, the operator drives the lifting mechanism 6 through the pneumatic valve 8. The lifting mechanism 6 then moves the permanent magnet 12 into place. The signal sensor magnet 1 inside slot 41 is lifted upwards and disengaged from slot 41, making it easy for the operator to remove the signal sensor magnet 1. Then, the magnetic field of the scanning product plane is measured and the magnetic field strength of Bz and By at the set height is derived with a step angle of 0.2°. The changes in By and Bz are respectively sine and cosine curves relative to the same mechanical angle. The magnetic pole angle θ = arctan2(-1.65By, Bz) / 3.6 is calculated once for each scan step. The change in magnetic pole angle θ is directly proportional to the mechanical angle. The difference between the magnetic pole angle and the mechanical angle is the deviation angle. If the deviation angle < 1.7°, the magnetized signal sensor magnet 1 is qualified.

[0042] In summary, the permanent magnet in this application is magnetized using a single-plane four-pole configuration. A 20° N / S pole pair is designed at both ends of the permanent magnet to stabilize the magnetic field in the central working area, effectively improving the stability and accuracy of the signal sensor magnet. The magnetization device in this application has four pole heads arranged evenly at intervals along an arc. A pressure plate is placed above the pole heads, with slots on the pressure plate for positioning the signal sensor magnet. This achieves precise positioning of the signal sensor magnet, improving the magnetization accuracy and enabling precise control of the magnetic poles, thus enhancing the overall precision of the signal sensor magnet. Therefore, this application effectively overcomes the various shortcomings of existing technologies and possesses high industrial applicability.

[0043] The above embodiments are merely illustrative of the principles and effects of this application and are not intended to limit this application. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this application. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this application should still be covered within the protection scope of this application.

Claims

1. A signal sensor magnet, comprising a back iron (11) and a permanent magnet (12) connected together, characterized in that, The permanent magnet (12) is injection molded on one side surface of the back iron (11). The permanent magnet (12) has four magnetic poles on a single plane, namely the first magnetic pole (16), the second magnetic pole (17), the third magnetic pole (18) and the fourth magnetic pole (19). The magnetic poles of two adjacent magnetic poles are opposite. The back iron (11) has positioning holes (13) at both ends.

2. The signal sensor magnet according to claim 1, characterized in that: At least one connection hole (15) is provided on the back iron (11), and the permanent magnet (12) is injection molded to form a reverse snap point (14) that penetrates and is fixed inside the connection hole (15).

3. The signal sensor magnet according to claim 1, characterized in that: The permanent magnet (12) is set in an arc shape, the arc angle between the second magnetic pole (17) and the third magnetic pole (18) is 45-50 degrees, and the arc angle between the first magnetic pole (16) and the fourth magnetic pole (19) is 15-20 degrees.

4. The signal sensor magnet according to claim 1, characterized in that: The permanent magnet (12) is made by granulation and injection molding of original magnetic powder with a maximum magnetic energy product (BH)max of 10.5M and a ratio of magnetic powder to binder of 100:

23.

5. A magnetizing device suitable for a signal sensor magnet as described in any one of claims 1-4, characterized in that: The device includes a base (3), an iron pole (5) is provided on one side above the base (3), at least four pole heads (51) are provided in the middle of the upper surface of the iron pole (5), the pole heads (51) are evenly spaced along an arc, the cross section of the pole head (51) is fan-shaped, a wire connector (52) electrically connected to the pole head (51) is provided on one side of the iron pole (5), a pressure plate (4) is provided above the iron pole (5), and a slot (41) is provided in the middle of the pressure plate (4) corresponding to the pole head (51) and adapted to the shape of the signal sensor magnet (1).

6. The magnetizing device according to claim 5, characterized in that: The electrode head (51) is wrapped with copper wire on the outside, and the copper wire is vacuum-sealed and cured.

7. The magnetizing device according to claim 5, characterized in that: A sealing plate (57) is connected to the bottom surface of the pole iron (5). A sealing gasket (58) is provided at the connection between the sealing plate (57) and the pole iron (5). A cooling cavity (55) is provided between the bottom surface of the pole iron (5) and the sealing plate (57). At least two pipe interfaces (56) connecting the cooling cavity (55) are provided on one side of the pole iron (5).

8. The magnetizing device according to claim 5, characterized in that: The bottom surfaces of the pole iron (5) are connected to the base (3) via side plates (7). A lifting mechanism (6) is provided below the pole iron (5). The lifting mechanism (6) includes a lifting seat (61) that is movably disposed below the pole iron (5). A top rod (62) is provided above the lifting seat (61) corresponding to the pole head (51). A through hole (54) is provided on the pole head (51) corresponding to the top rod (62). The top rod (62) passes through the through hole (54) and moves freely up and down along the through hole (54).

9. The magnetizing device according to claim 8, characterized in that: A cylinder (64) is provided below the lifting seat (61) to drive the lifting seat (61) to move up and down. A pneumatic valve (8) is provided on one side of the pole iron (5). The pneumatic valve (8) is connected to the cylinder (64) through a pipeline.

10. The magnetizing device according to claim 5, characterized in that: The pole head (51) is provided with an insertion hole (53) corresponding to the positioning hole (13) on the back iron (11).

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