Permanent magnet plane multi-stage magnetizing device based on printed circuit and manufacturing method of permanent magnet plane multi-stage magnetizing device

Abstract

The invention discloses a permanent magnet plane multistage magnetizing device based on a printed circuit and a manufacturing method thereof, and particularly relates to the technical field of magnet magnetizing devices. The magnetizing device comprises an insulating bottom plate, a metal wire, an insulating coating and outgoing lines, the metal wire is formed by processing a metal plate adhered to the insulating bottom plate in a printed circuit etching mode, the insulating coating is sprayed on the surface of the metal wire, and the metal wire is connected with the positive electrode and the negative electrode of the magnetizer through the two outgoing lines. A magnetizing coil closed loop is formed; according to the invention, the problems of small wire diameter, difficult threading, complex winding shape and the like in the manufacturing of a traditional planar multi-pole small-pole-width magnetizing clamp are solved, the magnetic pole angle precision and the surface magnetic uniformity of the magnetizing clamp are improved, a magnetic pole with a small pole width of 0.5 mm can be magnetized, and a complex magnetic pole distribution structure can be magnetized.

Description

Technical Field

[0001] The invention relates to the technical field of permanent magnet planar multi-pole magnetizing devices, in particular to a magnetizing fixture with a planar micro-pole width and complex magnetic pole distribution. Background Art

[0002] Planar multi-pole magnetized permanent magnets are widely used in instrument switches, magnetic sensors, servo motor magnetic encoders and other fields. The surface magnetic pole strength and angle / area position accuracy are mainly determined by the magnetizing fixture. As magnets develop towards miniaturization, the requirements for permanent magnet magnetization technology are getting higher and higher.

[0003] The magnetizing fixture is a device that converts electrical energy into magnetic field energy and magnetizes the permanent magnet according to the design requirements. The traditional planar multi-pole magnetizing fixture is composed of conductive coils, iron cores, encapsulation resin and other structures. The magnetizing magnetic field energy is provided by the conductive coils, and the angle / size accuracy of the magnetizing magnetic poles is mainly determined by the iron core. The conductive coils are fixed by the encapsulation resin. With the rise of emerging industries such as new energy vehicles, autonomous driving, drones, and industrial robots, the demand for small pole width and high-precision planar multi-pole magnetic encoders is increasing. The iron core processing, winding, and insulation control of the traditional structure magnetizing fixture are difficult to meet the requirements, and the magnetic pole accuracy, stability, and service life of the magnetizing fixture cannot be guaranteed.

[0004] For existing planar magnetization technology, please refer to: the invention patent with publication number CN110189884A, A planar micro-pole pitch multi-pole magnetization method (application number CN201910482026.7), which discloses a planar micro-pole pitch multi-pole magnetization method, in which the magnet to be magnetized is placed in a magnetization coil for unidirectional saturation magnetization to form a single magnetic pole on the magnet surface to be magnetized; a tooth-shaped magnetic conductive mold is placed on the magnet surface to be magnetized for reverse magnetization to complete the planar multi-pole magnetization. Although it is not necessary to arrange wires on the teeth of the mold, it is still necessary to machine the tooth-shaped magnetic conductive mold, and the reverse magnetization of the single-pole multi-pole tooth-shaped magnetic conductive mold limits the pole width and magnetic pole accuracy.

[0005] The invention patent with publication number CN110600221A discloses a magnetizing device and magnetizing method (application number CN201911001485.5), which uses a planar wound spiral coil as a magnetic field generating unit to generate a parallel magnetic field in a preset area and magnetize the components in the area. This invention can only generate a parallel magnetic field in one direction, and the magnetizing method is single, and it is impossible to achieve planar multi-pole magnetization and magnetization with complex magnetic pole distribution. Summary of the invention

[0006] Based on the deficiencies in the prior art, the purpose of the present invention is to provide a planar multi-stage magnetization device for permanent magnets based on printed circuits and a method for manufacturing the same, which breaks through the structure and manufacturing method of the traditional planar multi-stage magnetization fixture. The magnetization fixture has high magnetization stability and angle accuracy, and a long fixture life, and can perform planar multi-pole magnetization on a small pole width of 0.5 mm.

[0007] A planar multi-level magnetizing device for permanent magnets based on printed circuits, comprising: The magnetizing structure includes: an insulating bottom plate, and a metal wire arranged on the insulating bottom plate, wherein the metal wire is connected to the positive and negative poles of the magnetizer through a lead-out wire connected to the back of the insulating bottom plate to form a closed loop of the magnetizing coil; The metal wire is formed by a metal plate adhered to an insulating base plate through printed circuit etching, high-precision CNC engraving, or laser engraving.

[0008] The present invention creatively adopts metal wires to be processed with high precision and then sprayed with insulating coating on the surface to form magnetized magnetic poles, thereby abandoning the traditional magnetic core structure and winding and glue-filling processes.

[0009] Furthermore, the insulating base plate has a thickness of 1-3 mm, and the material includes but is not limited to glass fiber epoxy resin board.

[0010] Furthermore, an insulating coating is sprayed on the surface of the metal wire to play an insulating role during the magnetization process of the magnet.

[0011] Furthermore, the metal wire is made of a metal plate adhered to an insulating base plate by etching a printed circuit. The metal plate material includes but is not limited to high conductivity metals such as pure copper and silver.

[0012] Furthermore, the metal wire processing method may also include high-precision CNC engraving, laser engraving, etc.

[0013] In the first embodiment of the present invention, the metal wire is composed of an outer ring metal wire and an inner ring metal wire, and the outer ring metal wire and the inner ring metal wire are distributed in concentric circles. The outer ring metal wire has 32 gear-like structures with equal concentric angles, corresponding to 64 magnetized poles, and the inner ring metal wire has 31 concentric gear-like structures, corresponding to 62 magnetized poles. Holes are punched at the metal wire terminals a1, b1, a2, and b2, and lead wires A1, B1, A2, and B2 are connected through the back of the insulating bottom plate. B1A2 is short-circuited to connect the outer ring metal wire and the inner ring metal wire in series, and lead wire A1 is connected to the negative pole of the magnetizer, and B2 is connected to the positive pole of the magnetizer to form a closed loop of the magnetizing coil. The magnetic encoder magnetic ring can be magnetized at one time with 64 poles on the outer ring and 62 poles on the inner ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a three-dimensional schematic diagram of Embodiment 1 of the present invention; Figure 2 It is a front view of Embodiment 1 of the present invention; Figure 3 It is a top view of Embodiment 1 of the present invention; Figure 4 This is a diagram of the magnetic pole distribution of the fixture during magnetization and discharge in Example 1 of the present invention; Figure 5 This is a schematic diagram of the magnetic pole distribution on the surface of the magnet after the magnet is plane-multipolar magnetized in Example 1 of the present invention; Figure 6 This is a schematic diagram of the structure of Embodiment 2 of the present invention; Figure 7 This is a diagram of the magnetic pole distribution of the fixture during magnetization and discharge in Example 2 of the present invention; Figure 8 This is a schematic diagram of the magnetic pole distribution on the surface of the magnet after the magnet is plane-multipolar magnetized in Example 2 of the present invention; Fig. 9 This is a three-dimensional schematic diagram of embodiment 3 of the present invention.

[0015] Fig.10 This is a schematic diagram of the structure of Embodiment 3 of the present invention; Fig.11 This is a diagram of the magnetic pole distribution of the fixture during magnetization and discharge in Example 3 of the present invention; Fig.12 This is a schematic diagram of the magnetic pole distribution on the surface of the magnet after the magnet is plane-multipolar magnetized in Example 3 of the present invention; Explanation of the accompanying drawings: 1. Insulating base plate; 2. Metal wire; 2.1. Outer ring metal wire; 2.2. Inner ring metal wire; 2.3. Outer ring metal wire B; 2.4. Inner ring metal wire B; 2.5. Metal wire C; 3. Insulating coating; 4. Lead wire; Metal wire terminals a1, a2, b1, b2, c1-c17, d1-d17, lead wires A1, A2, B1, B2, C1, D17 correspond to a1, a2, b1, b2, c1, d17 respectively. DETAILED DESCRIPTION

[0016] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0017] See also Figure 1-7 As shown, before any embodiments of the present invention are described in detail, it should be understood that the present invention is not limited in its application to the details of construction and arrangement of components described below or illustrated in the following drawings. The present invention is capable of other embodiments and can be practiced or carried out in various ways.

[0018] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0019] See also Figure 1-5 Embodiment 1 of the present invention is a planar multi-level magnetizing device for permanent magnets based on printed circuits, wherein the magnetizing structure includes: an insulating base plate 1, an outer metal wire 2.1, an inner metal wire 2.2, an insulating coating 3 and a lead wire 4. The outer metal wire 2.1 and the inner metal wire 2.2 are connected to the positive and negative poles of the magnetizer through the lead wire 4 on the back of the insulating base plate 1 to form a closed loop of the magnetizing coil. The insulating coating 3 is sprayed on the surface of the metal wire to play an insulating role in the magnetizing process.

[0020] See also Figure 1 and Figure 2 The outer ring metal wire 2.1 and the inner ring metal wire 2.2 described in Example 1 of the present invention are preferably made of a copper plate adhered to an insulating base plate by printed circuit etching, the copper plate thickness is 0.2-0.5mm, and the metal wire width is 0.3-1mm. The processing methods of the outer ring metal wire 2.1 and the inner ring metal wire 2.2 can also include high-precision CNC engraving, laser engraving, etc.

[0021] See also Figure 1 and Figure 2 The outer ring metal wire 2.1 and the inner ring metal wire 2.2 described in Example 1 of the present invention are distributed in concentric circles. The outer ring metal wire 2.1 has 32 gears, and the tooth width / slot width angle is 5.625°, corresponding to 64 magnetized poles. The inner ring metal wire 2.2 has 31 gears, and the tooth width / slot width angle is 5.8065°, corresponding to 62 magnetized poles.

[0022] See also Figure 4 The terminals a1, b1, a2, and b2 of the outer ring metal wire 2.1 and the inner ring metal wire 2.2 described in Example 1 of the present invention are punched, and the lead wires 4A1, B1, A2, and B2 are connected through the back of the insulating base plate 1, B1A2 is short-circuited, A1 is connected to the negative pole of the magnetizer, and B2 is connected to the positive pole of the magnetizer to form a closed loop of the magnetizing coil. Figure 4 The S / N magnetic poles shown are the magnetic pole distribution diagram of the fixture during magnetization and discharge in Example 1 of the present invention; See also Figure 5 , a planar multi-pole magnetizing device of a permanent magnet based on a printed circuit as described in Example 1 of the present invention, a schematic diagram of the magnetic pole distribution on the surface of a magnetic ring after double-code-track planar multi-pole magnetization with 62 inner poles and 64 outer poles.

[0023] See also Figure 6-8Embodiment 2 of the present invention is a planar multi-level magnetizing device for permanent magnets based on printed circuits, wherein the magnetizing structure includes: an insulating base plate 1, an outer metal wire B2.3, an inner metal wire B2.4, an insulating coating 3 and a lead wire 4. The outer metal wire B2.3 and the inner metal wire B2.4 are connected to the positive and negative poles of the magnetizer through the lead wire 4 on the back of the insulating base plate 1 to form a closed loop of the magnetizing coil. The insulating coating 3 is sprayed on the surface of the metal wire, which plays an insulating role in the magnetizing process.

[0024] See also Figure 6 The outer ring metal wire B2.3 and the inner ring metal wire B2.4 described in Example 2 of the present invention are preferably made of a copper plate adhered to an insulating base plate by printed circuit etching. The thickness of the copper plate is 0.2-0.5mm, and the width of the metal wire is 0.3-1mm. The processing methods of the outer ring metal wire B2.3 and the inner ring metal wire B2.4 can also include high-precision CNC engraving, laser engraving, etc.

[0025] See also Figure 6 The outer ring metal wire B2.3 and the inner ring metal wire B2.4 described in Example 2 of the present invention are distributed in concentric circles. The outer ring metal wire 2.3 has 32 gears, and the tooth width / slot width angle is 5.625°, corresponding to 64 magnetized poles. The inner ring metal wire 2.4 is composed of 16 segments of frame-shaped wires, corresponding to 16 magnetized poles, and the single pole width angle is 22.5°.

[0026] See also Figures 6 to 8 The outer ring metal wire B2.3 and the inner ring metal wire B2.4 described in Example 2 of the present invention have holes at the terminals c1-c17 and d1-d17, and are connected to d1c2, d2c3, d3c4, d4c5, d5c6, d6c7, d7c8...d16c17 in sequence through the back side of the insulating base plate 1 with wires, and finally wires C1 and D17 are led out from the terminals c1 and d17, C1 is connected to the negative pole of the magnetizer, and D17 is connected to the positive pole of the magnetizer, so as to form a closed loop of the magnetizing coil. Figure 7 The S / N magnetic poles shown are the magnetic pole distribution diagram of the fixture during magnetization and discharge in Example 2 of the present invention; Figure 8 , a schematic diagram of the magnetic pole distribution on the surface of the magnetic ring after magnetization by the double-code-channel planar multi-pole magnetization fixture with 16 inner poles and 64 outer poles described in Example 2 of the present invention.

[0027] See also Figures 9 to 12Embodiment 3 of the present invention is a planar multi-level magnetizing device for permanent magnets based on printed circuits, wherein the magnetizing structure includes: an insulating base plate 1, a metal wire C2.5, an insulating coating 3 and a lead wire 4. The metal wire C2.5 is connected to the positive and negative poles of the magnetizer through the lead wire 4 on the back of the insulating base plate 1 to form a closed loop of the magnetizing coil. The insulating coating 3 is sprayed on the surface of the metal wire C2.5 to play an insulating role in the magnetizing process.

[0028] See also Fig.10 The metal wire C2.5 described in Example 3 of the present invention is preferably made of a copper plate adhered to an insulating base plate by high-precision CNC engraving, with a copper plate thickness of 0.5-1.0 mm and a metal wire width of 0.3-1 mm. The metal wire C2.5 is arranged to semi-enclose the S / N poles according to the magnetic pole distribution requirements, see Fig.10 .

[0029] The metal wire C2.5 terminals described in Example 3 of the present invention are respectively connected to the positive and negative poles of the magnetizer to form a closed loop of the magnetizing coil. Fig.11 The S / N magnetic poles shown are the magnetic pole distribution diagram of the fixture during magnetization and discharge in Example 3 of the present invention; Fig.12 , a schematic diagram of the magnetic pole distribution on the surface of the magnetic ring after magnetization by the matrix-type planar multi-pole magnetization fixture described in Example 3 of the present invention.

[0030] It should be understood by those skilled in the art that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention may be deformed or modified in any way without departing from the principles.

[0031] The above description is only for the best embodiment of the present invention, but it should not be understood as limiting the claims. The present invention is not limited to the above embodiments, and its specific structure is allowed to be changed. All changes made within the scope of protection of the independent claims of the present invention are within the scope of protection of the present invention.

Claims

1. A planar multi-level magnetizing device for permanent magnets based on printed circuits, characterized in that: include: A magnetizing structure, the magnetizing structure comprising: an insulating base plate (1), and a metal wire arranged on the insulating base plate, the metal wire (2) being connected to a lead wire (4) through the back side of the insulating base plate (1) and connected to the positive and negative poles of a magnetizer, thereby forming a closed loop of a magnetizing coil; The metal wire (2) is made of a metal plate adhered to an insulating base plate by means of printed circuit etching, high-precision CNC engraving, or laser engraving.

2. A planar multi-level magnetizing device for permanent magnets based on printed circuits according to claim 1, characterized in that: The surface of the metal wire is sprayed with an insulating coating (3), which plays an insulating role during the magnetization process of the magnet.

3. A planar multi-level magnetizing device for permanent magnets based on printed circuits according to claim 1, characterized in that: The metal wire (2) consists of two parts: an outer ring metal wire (2.1) and an inner ring metal wire (2.2); the outer ring metal wire (2.1) and the inner ring metal wire (2.2) are arranged in concentric circles.

4. A planar multi-level magnetizing device for permanent magnets based on printed circuits according to claim 1, characterized in that: The outer ring metal wire (2.1) and the inner ring metal wire (2.2) have a gear-like structure with equal central angles; the outer ring metal wire (2.1) has m gears corresponding to 2m magnetized poles; the inner ring metal wire (2.2) has m-1 gears corresponding to 2m-2 magnetized poles.

5. The method for manufacturing a planar multi-level magnetizing device of a permanent magnet based on a printed circuit according to claim 4, characterized in that: The production steps are as follows: Step 1: Select a PBC copper-clad board with a certain copper layer thickness, and print an outer metal conductor (2.1) and an inner metal conductor (2.2) on the surface of the copper board; Step 2, etching and cleaning the printed copper clad laminate, leaving only the insulating base plate (1) and the metal conductor (2); Step 3, spraying insulating paint on the surface of the metal wire; Step 4: Drill holes at the terminals a1, b1, a2, and b2 of the metal wire (2), connect the lead wires (4) A1, B1, A2, and B2 through the back of the insulating base plate (1), short-circuit B1A2, connect A1 to the negative pole of the magnetizer, and connect B2 to the positive pole of the magnetizer to form a closed circuit of the magnetizing coil. Step five: a positioning structure is provided on the insulating bottom plate to fix the relative position of the magnet to be magnetized and the magnetic pole wire.

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