A magnetizing device for inner and outer circle monopolar radiation magnetic ring

Abstract

The present invention discloses a magnetizing device for inner and outer circular monopole radiation magnetic rings, belonging to the technical field of magnetizing permanent magnetic materials. The present invention comprises an outer ring fixture and an inner ring fixture arranged in the inner cavity of the outer ring fixture, and a placement area for the magnetic ring to be magnetized is reserved between the inner and outer ring fixtures; wherein, the inner and outer ring fixtures both comprise a plurality of iron cores and magnetizing coils wound on the iron cores, and the winding rule of the magnetizing coils is implemented according to the right-hand screw rule, and the winding directions of the magnetizing coils of the inner and outer ring fixtures are consistent and arranged in series. When the pulsed electric excitation magnetic field is applied, a radiation magnetic field with N / S being consistent in the radial direction is formed in the placement area, so that the magnetic ring can be saturated magnetized to achieve the optimal magnetic properties.

Description

Technical Field

[0001] The invention belongs to the technical field of permanent magnetic material magnetization, and more specifically relates to a magnetization device for inner and outer circle monopole radiation magnetic rings. Background Art

[0002] Currently, there are two main schemes for magnetizing the inner and outer circular monopolar radiating magnetic rings of permanent magnetic materials. One is to use a DC electromagnet for magnetization. The principle is to pass a constant current of DC through the coil, and the electromagnet and the attached iron block form a closed circuit. This generates a constant magnetic field in the coil, which then causes an excitation current to flow, generating a magnetic field. The magnetic ring to be magnetized is placed in this magnetizing magnetic field to achieve magnetization. The problems with this scheme are: 1. The low magnetizing magnetic field will result in insufficient magnetization saturation of the magnetic ring product, that is, the magnetic performance cannot reach the optimal level; 2. The continuous operation generates severe heat, and a small proportion (generally 1% to 3%) of the magnetization performance fails to meet the requirements.

[0003] The other method uses a permanent magnetic circuit design to form a circular radial magnetic circuit space, and then places the magnetic ring to be magnetized into this magnetic field space for magnetization and magnetization. The magnetic field strength of this method is weaker than the first method, and generally can only magnetize permanent magnetic rings with lower coercive force, such as those made of ferrite, alnico, and other materials.

[0004] A search revealed a Chinese patent application with publication number CN 217655718 U, which discloses a magnetizing device for a magnetic ring. This application comprises two opposing magnetizing sections, each adjacent to the other, with an iron core and an annular coil. The coils form an annular structure identical to the annular structure of the magnetic ring workpiece to be magnetized. One iron core is provided with at least three coils arranged inside and outside each other, while the other iron core is provided with at least one coil. The coils are coaxially arranged, and a magnetic ring placement space is provided between the coils of the two magnetizing sections. When the coils are energized, the currents flowing through the adjacent coils are in opposite directions. When the magnetic ring workpiece to be magnetized is located within the magnetic ring placement space, a coil is located in the middle of each end face of the workpiece to be magnetized. This application has the advantage of increasing the magnetic field intensity of the end faces of the injection-molded magnetic ring after magnetization.

[0005] For example, the application with Chinese patent publication number CN 219040173 U discloses a magnetizing coil with unevenly arranged conductors. The application includes an iron core, in which multi-turn coils and small-turn coils are appropriately and unevenly embedded in the wire embedding grooves of the iron core. The conductors of all the magnetizing coils are connected in series. The multi-turn coils are used to strengthen the magnetization of the workpiece; the small-turn coils are mainly used to connect the circuits of each coil so that the polarity of the rotor corresponds. The utility model designs the magnetizing coils differently according to the structure of the specific workpiece to be magnetized, especially by setting different numbers of turns in different parts, and appropriately embedding multi-turn coils and small-turn coils in the wire embedding grooves of the iron core, so as to grasp the main contradiction and improve the magnetization efficiency; it can meet various different needs; while meeting the magnetization requirements, the current of the conductor is minimized, thereby extending the service life of the magnetizing coil; and intermittent multiple magnetization is performed to ultimately meet the magnetic performance requirements of the entire rotor.

[0006] The above two related documents have not effectively solved the problem of low magnetization magnetic field. Summary of the Invention

[0007] 1. Problems to be solved

[0008] In response to at least some of the problems existing in the above-mentioned prior art, the present invention proposes an inner and outer circular monopole radiation magnetic ring magnetizing device, the purpose of which is to solve the problem that the existing magnetic ring magnetizing device has a low magnetizing magnetic field, resulting in insufficient magnetization saturation of the magnetic ring product, thereby failing to achieve its optimal magnetic performance.

[0009] 2. Technical solution

[0010] In order to solve the above problems, the technical solutions adopted by the present invention are as follows:

[0011] The present invention provides an inner and outer circular monopole radiation magnetic ring magnetization device, comprising an outer ring fixture and an inner ring fixture arranged in the inner cavity of the outer ring fixture, with a placement area for the magnetic ring to be magnetized being placed between the inner and outer ring fixtures; wherein, the inner and outer ring fixtures both comprise a plurality of iron cores and magnetization coils wound around the iron cores, and when a pulsed electric excitation magnetic field is applied, a radiation magnetic field with N / S being consistent in the radial direction is formed in the placement area.

[0012] Furthermore, the winding rule of the magnetizing coil is implemented according to the right-hand screw rule, wherein the winding directions of the magnetizing coils of the inner and outer ring clamps are consistent and they are arranged in series.

[0013] Furthermore, the cores of the inner and outer ring clamps are staggered.

[0014] Furthermore, the iron core is a T-shaped structure, the wings of the inner and outer T-shaped iron cores are arranged opposite to each other, and the wings of the T-shaped iron cores of the respective clamps are connected to each other to form a complete ring.

[0015] Furthermore, the inner and outer ring clamps are each provided with five iron cores, and the magnetizing coils on each iron core are wound clockwise.

[0016] Furthermore, the magnetizing coil has 3 to 12 turns and a diameter of 1 mm to 3.5 mm.

[0017] Furthermore, the width of the placement area is 0.03 to 0.10 mm greater than the width of the magnetic ring to be magnetized.

[0018] Furthermore, it also includes a pulse power supply, which is equipped with a 3500 microfarad capacitor and an adjustable magnetizing voltage switch, the range of which is 100V to 1200V.

[0019] Furthermore, a circulating water channel is provided inside the inner and outer ring clamps.

[0020] 3. Beneficial effects

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) The present invention provides a magnetizing device for inner and outer circular monopole radiation magnetic rings, wherein the inner and outer ring clamps each include a plurality of iron cores and a magnetizing coil wound on the iron cores, and the magnetic ring to be magnetized is placed in a placement area between the inner and outer ring clamps; when the pulsed electricity excites the magnetic field, a radiation magnetic field is formed in the placement area; since the current intensity of the pulsed electricity in the coil is several thousand to tens of thousands of amperes, according to the right-hand screw rule, a high-intensity magnetic field higher than 0.8T-3T can be generated, so that the magnetization intensity in the placement area is much higher than the traditional magnetization magnetic field, so that the magnetic ring can be saturated magnetized to achieve the optimal magnetic properties.

[0023] (2) The present invention provides an inner and outer circle monopole radiation magnetic ring magnetization device, wherein the winding rule of the magnetization coil is implemented according to the right-hand screw rule, wherein the winding directions of the magnetization coils of the inner and outer ring clamps are consistent and they are arranged in series, thereby ensuring that a radiation magnetic field with N / S being consistent in the radial direction is formed in the placement area.

[0024] (3) In the magnetizing device for inner and outer circular monopole radiation magnetic rings of the present invention, the staggered distribution of the iron cores of the inner and outer ring fixtures is conducive to ensuring the uniformity of the circumferential magnetization of the magnetic ring to be magnetized; at the same time, the iron core is a T-shaped structure, the wings of the inner and outer T-shaped iron cores are relatively arranged, and the wings of the T-shaped iron cores of each fixture are connected to each other to form a complete ring, so that the placement area becomes a ring area closed on both sides, thereby making the magnetic field uniformity in the ring area better. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the overall structure of an inner and outer circle monopole radiation magnetic ring magnetization device of the present invention;

[0026] Figure 2 A schematic diagram of the magnetic field effect diagram within the placement area of ​​the present invention;

[0027] Figure 3 This is a schematic diagram of the effect of the magnetic ring after magnetization in the present invention;

[0028] Figure 4 Schematic diagram of the winding of the magnetizing coil in the present invention.

[0029] In the figure: 1. Outer ring fixture; 11. Iron core; 12. Magnetizing coil; 2. Inner ring fixture; 3. Magnetic ring to be magnetized. DETAILED DESCRIPTION

[0030] The present invention will be further described below with reference to specific embodiments.

[0031] Example 1

[0032] like Figure 1 As shown, an inner and outer circular monopole radiation magnetic ring magnetization device of this embodiment includes an outer ring fixture 1 and an inner ring fixture 2. The inner ring fixture 2 is located in the inner cavity of the outer ring fixture 1, and a placement area for the magnetic ring 3 to be magnetized is left between the inner ring fixture 2 and the outer ring fixture 1.

[0033] The outer ring fixture 1 and the inner ring fixture 2 have essentially the same structure, both comprising an annular iron core 11 and a magnetizing coil 12 wound around the iron core 11. When a pulsed electrical magnetic field is applied, a radially aligned N / S magnetic field (NS or SN from inside to outside) is formed in the placement area, which is used to magnetize the magnetic ring 3 to be magnetized.

[0034] For the convenience of the following description, the iron core 11 and the magnetizing coil 12 of the outer ring fixture 1 are respectively the outer iron core and the outer coil; the iron core 11 and the magnetizing coil 12 of the inner ring fixture 2 are respectively the inner iron core and the inner coil.

[0035] Specifically, the iron core 11 is made of electrical pure iron or silicon steel with good magnetic permeability, and its magnetic permeability is 10,000 to 30,000, which generates a good uniform magnetic field.

[0036] The magnetizing coil 12 is a copper yarn wrapped winding, preferably with a density of 8-9g / cm 3 Industrial pure copper. The magnetizing coil has 3 to 12 turns and a diameter between 1 mm and 3.5 mm (flat wire with a cross-sectional size of 1*1 mm to 2*4 mm can also be used). Industrial pure copper has low resistivity and is relatively inexpensive. Coils with the appropriate ampere-turns generate less heat during operation than other materials (such as aluminum), ensuring long-term magnetic field stability during long-term magnetization.

[0037] In this embodiment, a magnetizing device for an inner and outer circle monopole radiation magnetic ring is provided, and the winding rule of the magnetizing coil 12 is implemented according to the right-hand screw rule. Figure 1 As shown, both the inner and outer coils are designed with 5, and the observation direction is determined to be from the outer circle to the center of the circle.

[0038] If the outer coil is wound in a clockwise direction (the current is clockwise along the viewing direction), then the inner coil should also be wound in a clockwise direction, and all 10 coils should be connected in series to ensure that the magnetic field N / S is consistent in the radial direction. Figure 4 .

[0039] refer to Figure 2 As shown in the figure, when the magnetic field is excited by pulse electricity, the magnetic field of the cavity in the area where the magnetic ring is placed can be a radiation magnetic field with an outer circle N pole and an inner circle S pole. When the magnetic ring 3 to be magnetized is placed in the cavity of the placement area and a pulse current is excited, the magnetic ring 3 to be magnetized can be saturated magnetized. After magnetization, the outer circle of the magnetic ring shows the S pole and the inner circle shows the N pole. By changing the direction of the current or changing the winding direction of the coil from clockwise to counterclockwise, the magnetic ring can be magnetized into a state with an inner circle S pole and an outer circle N pole (as shown in the figure). Figure 3 shown).

[0040] Of course, the inner and outer circle monopolar radiation magnetic ring magnetizing device of this embodiment needs to be equipped with a pulse power supply. Specifically in this embodiment, the pulse power supply is equipped with a 3500 microfarad capacitor and an adjustable magnetizing voltage switch with a range of 100V to 1200V.

[0041] This embodiment of a magnetizing device for an inner and outer circular monopolar radiating magnetic ring generates a magnetic field based on the right-hand screw rule for an energized solenoid. A short-circuited capacitor triggers a pulse current of 0.8kA to 30kA through the coil, which, according to Faraday's law of electromagnetic induction, instantly generates a magnetizing field of 0.8T to 3T, creating a high magnetic field.

[0042] Compared with the permanent magnet magnetic field or DC electromagnetic field currently used in the industry, the magnetic field strength is 0.4 to 1.0 T. The magnetizing magnetic field generated by the magnetizing device of this embodiment is significantly improved, thereby saturating the magnetic ring and optimizing its magnetic properties.

[0043] Furthermore, the above method was used to magnetize radiating rings of various sizes and made of various magnetic materials, including neodymium iron boron and ferrite. Based on the required performance of the rings, the magnetization fixture was designed with varying numbers of magnetizing coils. The following examples illustrate the winding of the magnetizing coils, all wound clockwise in the viewing direction. The magnetization method of this embodiment was also compared with a conventional DC electromagnetic field magnetization method (see Tables 1 and 2).

[0044] Table 1. Pulse magnetization method magnetization data

[0045]

[0046] Table 2. DC magnetization data

[0047]

[0048] From the above table, it can be seen that compared with the traditional DC electromagnetic field magnetization method, the pulse magnetization method of this embodiment has a significantly better surface magnetization by 8-15% because its pulse current is significantly better than the DC value, and the magnetic material performance is better developed, which is a better choice for motor-end applications.

[0049] Example 2

[0050] In order to further ensure the magnetization effect of the magnetic ring 3 to be magnetized, this embodiment further improves the specific arrangement and structure of the iron core 11.

[0051] Specifically, refer to Figure 1 As shown, the inner iron core and the outer iron core are staggered. This design will make the uniformity of the radiated magnetic field in the placement area better, thereby ensuring the uniformity of the magnetization of the magnetic ring.

[0052] Furthermore, the iron core 11 is a T-shaped iron core comprising a belly and wings. The magnetizing coil 12 is wound around the belly of each T-shaped iron core. The wings of the inner and outer T-shaped iron cores are positioned opposite each other, and the ends of the wings of the T-shaped iron cores are as long as possible, thereby minimizing the distance between adjacent wings on the same circular ring. Preferably, the ends of adjacent wings on the same circular ring are connected to each other, so that the wings of the T-shaped iron cores in the same fixture form a single unit.

[0053] That is to say, the inner ring of the outer ring fixture 1 and the outer ring of the inner ring fixture 2 each form a complete ring, so that the placement area becomes a ring area closed on both sides, so that the magnetic field uniformity is better.

[0054] In addition, the width of the placement area is 0.03 to 0.10 mm larger than the width of the magnetic ring 3 to be magnetized. This design ensures that the magnetic ring 3 to be magnetized can be smoothly placed in the placement area; on the other hand, it prevents the width of the placement area from being too large, which would affect the magnetization effect.

[0055] It should be noted that the width of the above-mentioned placement area refers to the distance between the outer ring formed by the wing of the inner T-shaped iron core and the inner ring formed by the wing of the outer T-shaped iron core; the width of the magnetic ring 3 to be magnetized refers to the distance between the inner ring and the outer ring of the magnetic ring.

[0056] Of course, to prevent the device from overheating during operation and affecting the magnetization effect, the inner and outer ring clamps are each provided with a circulating water channel, which can be used to cool the clamps during operation using cooling water / oil. It is worth noting that the circulating water channel here can be made using existing technology and will not be described in detail here.

[0057] The above is a schematic description of the present invention and its embodiments, which is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by this and, without departing from the purpose of the present invention, designs a structure and embodiment similar to this technical solution without inventiveness, they shall fall within the scope of protection of the present invention.

Claims

1. A magnetizing device for inner and outer circle monopolar radiation magnetic rings, characterized in that: It comprises an outer ring fixture (1) and an inner ring fixture (2) arranged in the inner cavity of the outer ring fixture (1), wherein a placement area for a magnetized magnetic ring (3) to be placed is reserved between the inner and outer ring fixtures; wherein the inner and outer ring fixtures each comprise a plurality of iron cores (11) and magnetizing coils (12) wound around the iron cores (11); when a pulsed electric excitation magnetic field is generated, a radiation magnetic field with N / S being consistent in the radial direction is formed in the placement area; The winding rule of the magnetizing coil (12) is implemented according to the right-hand screw rule, wherein the magnetizing coils (12) of the inner and outer ring clamps are wound in the same direction and are arranged in series; The magnetizing coil (12) has 3 to 12 turns and a diameter of 1 mm to 3.5 mm; The width of the placement area is 0.03-0.10 mm larger than the width of the magnetic ring (3) to be magnetized; It also includes a pulse power supply, which is equipped with a 3500 microfarad capacitor and an adjustable magnetizing voltage switch, with a range of 100V~1200V.

2. The inner and outer circle monopole radiation magnetic ring magnetization device according to claim 1, characterized in that: The iron cores (11) of the inner and outer ring clamps are staggered.

3. The inner and outer circle monopolar radiation magnetic ring magnetization device according to claim 2, characterized in that: The iron core (11) is a T-shaped structure, the wings of the inner and outer T-shaped iron cores are arranged opposite to each other, and the wings of the T-shaped iron cores of the respective clamps are connected to each other to form a complete ring.

4. The inner and outer circle monopole radiation magnetic ring magnetization device according to claim 3, characterized in that: The inner and outer ring clamps are each provided with five iron cores (11), and the magnetizing coils (12) on each iron core (11) are wound clockwise.

5. An inner and outer circular monopolar radiation magnetic ring magnetizing device according to any one of claims 1 to 4, characterized in that: Circulating water channels are provided inside the inner and outer ring clamps.

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