CN115036092B - Composite magnetic ring and preparation method thereof - Google Patents
Composite magnetic ring and preparation method thereof Download PDFInfo
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- CN115036092B CN115036092B CN202210866658.5A CN202210866658A CN115036092B CN 115036092 B CN115036092 B CN 115036092B CN 202210866658 A CN202210866658 A CN 202210866658A CN 115036092 B CN115036092 B CN 115036092B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F3/00—Cores, Yokes, or armatures
- H01F3/10—Composite arrangements of magnetic circuits
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F3/00—Cores, Yokes, or armatures
- H01F3/10—Composite arrangements of magnetic circuits
- H01F2003/103—Magnetic circuits with permanent magnets
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F3/00—Cores, Yokes, or armatures
- H01F3/10—Composite arrangements of magnetic circuits
- H01F2003/106—Magnetic circuits using combinations of different magnetic materials
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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Abstract
The invention provides a composite magnetic ring and a preparation method thereof, wherein the composite magnetic ring comprises an inner ring magnetic ring and an outer ring magnetic ring which are coaxial; the outer wall of the inner ring magnetic ring is provided with an axial trapezoid rib; the inner wall of the outer ring magnetic ring is provided with a groove matched with the trapezoid rib of the inner ring magnetic ring; magnetic fields are arranged between adjacent grooves, and the adjacent magnetic fields are in different orientations; the inner ring magnetic ring is made of soft magnetic composite materials; the outer ring magnetic ring is made of a permanent magnet composite material; the composite magnetic ring fully utilizes the characteristics of two different magnetic materials, couples the two materials, optimizes the magnetic ring structure, and greatly improves the surface magnetic field of the composite magnetic ring by further designing a magnetic circuit; the composite magnetic ring has the advantages of light weight, high surface magnetic property and good strength, has excellent dynamic balance characteristic, and is suitable for various micro-special motors.
Description
Technical Field
The invention belongs to the technical field of permanent magnet motors, and particularly relates to a composite magnetic ring and a preparation method thereof.
Background
The permanent magnet motor generates a magnetic field of the motor through the permanent magnet, so that exciting current is not needed, and compared with the traditional induction motor, the permanent magnet motor has the advantages of simpler structure, more reliable operation, small volume, light weight, small loss, high efficiency and the like, and is widely applied to various fields of traffic, aviation, national defense, industry and daily life. In recent years, with the increasing importance of environmental problems brought about by the greenhouse effect in various countries in the world, the energy efficiency requirements of various motors are increasing, and the motors are promoted to be miniaturized, light and high-efficiency. In a permanent magnet motor, the performance of the magnetic material is very critical to the structural design and final performance of the motor, and under the same winding parameters and test conditions, the higher the performance of the magnetic material, the higher the maximum torque of the motor and the higher the efficiency of the highest efficiency point of the motor. Meanwhile, for the permanent magnet motor with specified power, the number of turns of windings can be reduced by adopting a magnetic material with higher performance, and the size of the motor is reduced.
On the other hand, the size of the air-gap field of the permanent magnet motor is closely related to the shape, the size (surface area and thickness), the magnetizing mode, the magnetic coupling structure and the like of the adopted permanent magnet. Even though the magnetic materials with the same performance are designed by adopting different magnetic circuits, the obtained air-gap magnetic fields are completely different in size, so that how to adopt a proper magnetic circuit structure and fully utilize the performance of the magnetic materials is a hot spot for research in the field of motors.
CN107959361a discloses a stator of a permanent magnet torque motor, the slots between the teeth of each stator are sealed by a sealing material, so that the teeth of each stator are in an annular integral structure, and the yoke of each stator is in another integral structure, which are separable from each other, therefore, in the stator assembly process, after each armature winding is assembled on the corresponding stator teeth, the armature winding and the stator teeth can be directly connected together by inserting or buckling through a clamping slot. In addition, when the stator iron core is made of nanocrystalline soft magnetic alloy materials or high-grade silicon steel materials, the loss of the motor is reduced; when the rotor permanent magnet is supported by the iron core, the tangential magnetizing permanent magnet and the radial magnetizing permanent magnet are alternately arranged on the side surface of the working air gap of the iron core, so that the torque density of the motor is improved.
CN111164867a discloses that a permanent magnet carrier (which may be a rotor or a stator of an electric machine) comprises a first non-magnetic ring and a second non-magnetic ring. Between the rings are soft magnetic pole elements. The soft magnetic pole elements are each connected to the first non-magnetic ring and the second non-magnetic ring, and the soft magnetic pole elements are separated from each other by the first non-magnetic ring and the second non-magnetic ring. Permanent magnets are disposed between the soft magnetic pole elements.
Based on the above background, how to provide a magnetic ring device and a material, which can provide a high surface under the condition of smaller size, promote miniaturization and efficient development of a motor, and become the current problems to be solved.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention aims to provide a composite magnetic ring and a preparation method thereof, wherein the composite magnetic ring is made of two different magnetic materials, and the surface magnetic field of the magnetic ring is effectively improved by optimizing the structure of the magnetic ring, so that the air gap magnetic field of a motor can be improved when the composite magnetic ring is applied to the motor, and the miniaturization and the high efficiency of the motor are facilitated; the preparation method has simple process flow and is suitable for industrial production.
To achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a composite magnetic ring, the composite magnetic ring comprising an inner ring magnetic ring and an outer ring magnetic ring that are coaxial;
the outer wall of the inner ring magnetic ring is provided with an axial trapezoid rib;
the inner wall of the outer ring magnetic ring is provided with a groove matched with the trapezoid rib of the inner ring magnetic ring; magnetic fields are arranged between adjacent grooves, and the adjacent magnetic fields are in different orientations;
the inner ring magnetic ring is made of soft magnetic composite materials; the outer ring magnetic ring is made of a permanent magnet composite material.
In the invention, the composite magnetic ring fully utilizes the magnetic characteristics of the soft magnetic composite material and the permanent magnetic composite material, designs a novel structure of the inner ring of the soft magnetic composite material and the outer ring of the permanent magnetic composite material, and greatly improves the surface magnetic field of the composite magnetic ring by further designing a magnetic circuit; the composite magnetic ring has the advantages of light weight, high surface magnetic property and good strength, has excellent dynamic balance characteristic, and is suitable for various micro-special motors.
The following technical scheme is a preferred technical scheme of the invention, but is not a limitation of the technical scheme provided by the invention, and the technical purpose and beneficial effects of the invention can be better achieved and realized through the following technical scheme.
As a preferable technical scheme of the invention, the outer diameter of the inner ring magnetic ring is 35-45mm, such as 35mm, 37mm, 39mm, 41mm, 43mm or 45mm; the inner diameter is 30-38mm, for example 30mm, 32mm, 34mm, 36mm or 38mm, etc., and the above values are not limited to the values recited, but other values not recited in the respective ranges are equally applicable.
Preferably, the thickness of the inner ring magnetic ring is 2.5-3.5mm, such as 2.5mm, 2.7mm, 2.9mm, 3.1mm, 3.3mm or 3.5mm, etc., but is not limited to the recited values, and other non-recited values within the range of values are equally applicable.
Preferably, the outer diameter of the outer ring magnetic ring is 40-50mm, such as 40mm, 42mm, 44mm, 46mm, 48mm or 50mm, etc.; the inner diameter is 30 to 45mm, for example, 30mm, 32mm, 34mm, 36mm, 38mm, 40mm, 43mm or 45mm, etc., and the above values are not limited to the values recited, and other values not recited in the respective ranges are equally applicable.
Preferably, the thickness of the outer ring magnetic ring is 2.5-7.5mm, such as 2.5mm, 3.0mm, 4.5mm, 5.0mm, 5.5mm, 6.0mm, 6.5mm, 7.0mm or 7.5mm, etc., but is not limited to the recited values, and other non-recited values within the range of values are equally applicable.
In the invention, the size and thickness of the inner ring magnetic ring and the outer ring magnetic ring have certain influence on the performance of the finally obtained composite magnetic ring. If the thickness is proper, the size of the inner ring magnetic ring and the outer ring magnetic ring is overlarge, namely the size of the whole composite magnetic ring is overlarge, so that the surface magnetic waveform of the magnetic ring can be changed, collapse occurs in the middle of a peak, and the surface magnetic peak value is reduced; if the thickness is proper, but the sizes of the inner ring magnetic ring and the outer ring magnetic ring are too small, namely the size of the whole composite magnetic ring is too small, the total magnetic flux of the magnetic ring can be reduced; if the overall size of the composite magnetic ring is proper, but the thickness of the inner ring magnetic ring is too thick, the waste of soft magnetic materials can be caused, and meanwhile, the total weight of the magnetic ring is increased; if the overall size of the composite magnetic ring is proper, but the thickness of the inner ring magnetic ring is too thin, the magnetic flux on the surface of the composite magnetic ring can be reduced; if the overall size of the composite magnetic ring is proper, but the thickness of the outer ring magnetic ring is too thick, the waste of permanent magnetic materials can be caused; if the overall size of the composite magnetic ring is proper, but the thickness of the outer ring magnetic ring is too thin, the magnetic flux on the surface of the composite magnetic ring is reduced.
In a preferred embodiment of the present invention, the height of the trapezoid rib of the inner ring magnetic ring is 1/2-2/3, for example, 1/2, 7/12 or 2/3, of the thickness of the outer ring magnetic ring, but the present invention is not limited to the recited values, and other non-recited values within the range of the recited values are equally applicable.
In the invention, the control of the height of the trapezoid prism is also very important. If the height of the trapezoid ribs is too small, the size and distribution of the surface magnetic flux are changed, the peak value is reduced, the strength of the outer ring magnetic ring is poor, and in actual use, the outer magnetic ring is cracked due to external factors such as cold and hot temperature difference and vibration.
Preferably, the sides of the trapezoid cross section of the trapezoid rib form an angle of 45-60 degrees, such as 45 degrees, 50 degrees, 55 degrees, 60 degrees, etc., with respect to the horizontal plane, but not limited to the recited values, and other non-recited values within the range of values are equally applicable.
In the invention, the included angle between the side edge of the trapezoid cross section of the trapezoid rib and the horizontal plane also affects the performance of the composite magnetic ring. If the angle is too small. The appearance of the peak value of the surface magnetic is reduced; if the angle is too large, the strength of the outer ring magnetic ring is poor.
Preferably, the number of the trapezoid ribs is 6 to 10, for example 6, 7, 8, 9 or 10, etc., but is not limited to the recited values, and other non-recited values within the range of values are equally applicable.
As a preferable technical scheme of the invention, the surface magnetic curve of the composite magnetic ring is a sine waveform.
Preferably, the average peak value of the number of times of the composite magnetic ring is not less than 2500Gs, for example 2500Gs, 2550Gs, 2600Gs, 2650Gs, 2700Gs, 2750Gs, 2800Gs, 2850Gs, 2900Gs, 2950Gs or 3000Gs, etc., but is not limited to the recited values, and other non-recited values within the range of values are equally applicable.
In a second aspect, the present invention provides a method for preparing the composite magnetic ring, where the method includes the following steps:
(1) Preparing an inner ring magnetic ring by adopting a soft magnetic composite material through an injection process;
(2) Preparing an outer ring magnetic ring by an injection process on the basis of the inner ring magnetic ring, thereby obtaining a composite magnetic ring;
wherein, in the mould that the outer lane magnetic ring was used of preparation, be provided with the magnetic field.
According to the invention, when the inner ring magnetic ring is prepared, no additional magnetic field is needed to be added in the mold, only the needed magnetic field is needed to be arranged in the mold when the outer ring magnetic ring is prepared, and a mature injection process is adopted, so that the process is simple, the production efficiency is high, and the large-scale production is facilitated.
As a preferable technical scheme of the invention, the preparation of the soft magnetic composite material in the step (1) comprises the following steps:
(1) preparing a surface treatment solution: mixing phosphoric acid, an alcohol solution, a zinc source and water-soluble resin to obtain a surface treatment solution;
(2) and mixing the obtained surface treatment solution with iron powder, a silane coupling agent and a high polymer material in sequence, mixing and granulating to obtain the soft magnetic composite material.
In the invention, the permanent magnet composite material of the outer ring magnetic ring can be prepared by using the method of patent 202111363515.4. The soft magnetic composite material adopted by the inner ring magnetic ring is prepared by adopting the method, and the soft magnetic composite material prepared by the method has good strength and injectability on the premise of ensuring enough soft magnetic performance, and compared with the existing soft magnetic composite material, the soft magnetic composite material can be integrally injection molded with the permanent magnetic ring by an injection molding mode, and finally the composite magnetic ring with excellent performance is obtained.
As a preferred embodiment of the present invention, the preparation of the surface treatment solution in step (1) more specifically includes: mixing and heating phosphoric acid, absolute ethyl alcohol, water, a zinc source and water-soluble resin in sequence to obtain a surface treatment solution.
Preferably, the zinc source comprises zinc oxide.
Preferably, the water-soluble resin comprises any one or a combination of at least two of polypropylene, polyamide or polyethylene glycol.
Preferably, the temperature of the mixing in step (1) is 70-90 ℃, such as 70 ℃, 75 ℃, 80 ℃, 85 ℃, or 90 ℃, etc., but is not limited to the recited values, and other non-recited values within the range of values are equally applicable.
In a preferred embodiment of the present invention, the particle size of the iron powder in the step (2) is 50 to 100. Mu.m, for example, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm or 100. Mu.m, etc., but the particle size is not limited to the recited values, and other non-recited values within the range of the recited values are equally applicable.
Preferably, the permeability of the iron powder in step (2) is 600-800H/m, such as 600H/m, 650H/m, 700H/m, 750H/m or 800H/m, etc., but is not limited to the recited values, and other non-recited values within the range of values are equally applicable.
Preferably, the saturation magnetization of the iron powder in step (2) is 1.4-1.8T, for example, 1.4T, 1.5T, 1.6T, 1.7T, or 1.8T, etc., but is not limited to the recited values, and other non-recited values within the range of values are equally applicable.
Preferably, the mass ratio of the surface treatment solution to the iron powder in the step (2) is 1 (9-11), such as 1:9, 1:9.5, 1:10, 1:10.5 or 1:11, but is not limited to the recited values, and other non-recited values within the range of values are equally applicable.
As a preferred technical scheme of the invention, the addition amount of the silane coupling agent in the step (2) is 0.5-1.5% of the mass of the iron powder, for example.
Preferably, the polymer material in step (2) includes any one or a combination of at least two of PP, PA6, PA12, POM or PPs, and typical but non-limiting examples of the combination are: a combination of PP and PA6, a combination of PA6 and PA12, a combination of POM and PPS, etc.
Preferably, the temperature of the mixing in step (2) is 130-160 ℃, such as 130 ℃, 140 ℃, 150 ℃, 160 ℃, etc., but is not limited to the recited values, and other non-recited values within the range of values are equally applicable.
In the preferred technical scheme of the invention, in the die in the step (2), the set magnetic field waveform is a sine waveform.
Preferably, in the mold of step (2), the magnetic field strength is set to 0.8-1.0T, for example, 0.8T, 0.85T, 0.9T, 0.92T or 1.0T, etc., but not limited to the recited values, and other non-recited values within the range are equally applicable.
In the invention, if the orientation magnetic field in the die is smaller than 0.8T, the magnetic material in the outer ring magnetic ring cannot be fully oriented, and the high-surface magnetic field cannot be achieved; the in-mold magnetic field strength also need not exceed 1.0T, since the magnetic material is already sufficiently oriented at 1.0T, with no necessity of continuing to increase.
Compared with the prior art, the invention has the following beneficial effects:
(1) The composite magnetic ring fully utilizes the magnetic characteristics of the soft magnetic composite material and the permanent magnetic composite material, couples the soft magnetic composite material and the permanent magnetic composite material, designs a novel structure of the inner ring of the soft magnetic composite material and the outer ring of the permanent magnetic composite material, greatly improves the surface magnetic field of the composite magnetic ring by further designing a magnetic circuit, and can enable the average surface magnetic strength of the composite magnetic ring to be more than 2510Gs by further controlling the conditions of the size, the thickness and the like of each magnetic ring in the design process;
(2) The composite magnetic ring has the advantages of light weight, high surface magnetic property and good strength, has excellent dynamic balance characteristic because the composite magnetic ring is formed by integrating the permanent magnetic ring and the soft magnetic ring through an injection process, and is suitable for various micro-special motors
(3) The preparation method of the composite magnetic ring has the advantages of simple process flow, high production efficiency and good industrial application prospect.
Drawings
Fig. 1 is a schematic structural diagram of a composite magnetic ring according to embodiment 1 of the present invention.
Wherein, 1-inner ring magnetic ring, 11-trapezoid prismatic strip, 2-outer ring magnetic ring, N-N pole magnetic field, S-S pole magnetic field.
Detailed Description
For better illustrating the present invention, the technical scheme of the present invention is convenient to understand, and the present invention is further described in detail below. The following examples are merely illustrative of the present invention and are not intended to represent or limit the scope of the invention as defined in the claims.
The following are exemplary but non-limiting examples of the invention:
example 1:
the embodiment provides a composite magnetic ring and a preparation method thereof, wherein the preparation method comprises the following steps:
firstly, preparing a soft magnetic composite material required by the inner ring magnetic ring 1:
(1) preparing a surface treatment solution: a. adding 1 kg of phosphoric acid solution with the concentration of 85wt% into 10 kg of absolute ethyl alcohol, then adding 200g of deionized water, and fully stirring; b. 200g of zinc oxide is added and fully stirred; c. then 300g of polyethylene glycol is added; d. heating the solution to 80 ℃, and fully stirring until the water-soluble resin is completely dissolved;
(2) adding the obtained surface treatment solution into iron powder with the D50 of 50 mu m, the magnetic permeability mu of 800H/m and the saturation magnetization of 1.8T, stirring for 30min in a high-speed mixer, heating to 150 ℃, and continuously stirring for 1H, wherein the mass ratio of the surface treatment solution to the iron powder is 1:10; adding a silane coupling agent (KH 550) into the mixture, and stirring the mixture for 30 minutes, wherein the addition amount of the silane coupling agent is 1% of the mass of the iron powder; and then adding PA12 powder, continuing to stir for 1h, mixing uniformly, and then placing the mixture in a double-screw mixer for mixing and granulating to obtain the soft magnetic composite material.
Next, a permanent magnet composite material was prepared, the preparation method of which was referred to example 1 in patent 202111363515.4.
Preparing a composite magnetic ring:
(1) Preparing an inner ring magnetic ring 1 by using the obtained soft magnetic composite material through an injection molding process, wherein the injection temperature is 260 ℃; wherein, the outer diameter of the inner ring magnetic ring 1 is 35mm, the inner diameter is 30mm, and the thickness is 2.5mm; the outer wall of the inner ring magnetic ring 1 is provided with 8 trapezoid ribs 11, the height of each trapezoid rib 11 is 1/2 of the thickness of the outer ring magnetic ring 2, and the included angle between the side edge of the trapezoid section and the horizontal plane is 45 degrees;
(2) By using the obtained permanent magnet composite material, the outer ring magnetic ring 2 is prepared by an injection process on the basis of the obtained inner ring magnetic ring 1, wherein the magnetic field in the die cavity is of an 8-pole structure with alternating N poles and S poles, the waveform is a sine wave, and the magnetic field strength is 1.0T; the outer diameter of the outer ring magnetic ring 2 is 40mm, the inner diameter is 35mm, and the thickness is 2.5mm.
The structural schematic diagram of the composite magnetic ring prepared by the preparation method is shown in figure 1.
Example 2:
the present embodiment provides a composite magnetic ring and a preparation method thereof, and the preparation method refers to the preparation method in embodiment 1, and the difference is that: when the soft magnetic composite material is prepared, the step (2) is selected from iron powder with the D50 of 50 mu m, the magnetic permeability mu of 800H/m and the saturation magnetization of 1.4T.
Example 3:
the present embodiment provides a composite magnetic ring and a preparation method thereof, and the preparation method refers to the preparation method in embodiment 1, and the difference is that: when the soft magnetic composite material is prepared, the step (2) is selected from iron powder with D50 of 75 mu m, magnetic permeability mu of 700H/m and saturation magnetization of 1.6T.
Example 4:
the present embodiment provides a composite magnetic ring and a preparation method thereof, and the preparation method refers to the preparation method in embodiment 1, and the difference is that: when the soft magnetic composite material is prepared, PPS powder is selected in the step (2) when the polymer material is used; correspondingly, when the composite magnetic ring is prepared by virtue of different polymer materials, the injection temperature in the step (1) is 300 ℃.
Example 5:
the present embodiment provides a composite magnetic ring and a preparation method thereof, and the preparation method refers to the preparation method in embodiment 1, and the difference is that: when the composite magnetic ring is prepared, the magnetic field intensity in the die cavity in the step (2) is 0.8T.
Example 6:
the present embodiment provides a composite magnetic ring and a preparation method thereof, and the preparation method refers to the preparation method in embodiment 1, and the difference is that: when the composite magnetic ring is prepared, the outer diameter of the inner ring magnetic ring 1 in the step (1) is 45mm, the inner diameter is 38mm, and the thickness is 3.5mm; correspondingly, in the step (2), the outer diameter of the outer ring magnetic ring 2 is 50mm, the inner diameter is 45mm, and the thickness is 2.5mm.
Example 7:
the present embodiment provides a composite magnetic ring and a preparation method thereof, and the preparation method refers to the preparation method in embodiment 1, and the difference is that: when the composite magnetic ring is prepared, the outer diameter of the inner ring magnetic ring 1 in the step (1) is 40mm, the inner diameter is 33mm, and the thickness is 3.5mm; correspondingly, in the step (2), the outer diameter of the outer ring magnetic ring 2 is 50mm, the inner diameter is 40mm, and the thickness is 5mm.
Example 8:
the present embodiment provides a composite magnetic ring and a preparation method thereof, and the preparation method refers to the preparation method in embodiment 1, and the difference is that: when the composite magnetic ring is prepared, the height of the trapezoid ribs 11 of the inner ring magnetic ring 1 in the step (1) is 2/3 of the thickness of the outer ring magnetic ring 2.
Example 9:
the present embodiment provides a composite magnetic ring and a preparation method thereof, and the preparation method refers to the preparation method in embodiment 1, and the difference is that: when the composite magnetic ring is prepared, the included angle between the side edge of the trapezoid cross section of the trapezoid rib 11 and the horizontal plane of the inner ring magnetic ring 1 in the step (1) is 60 degrees.
Example 10:
the present embodiment provides a composite magnetic ring and a preparation method thereof, and the preparation method refers to the preparation method in embodiment 6, and the difference is that: when the composite magnetic ring is prepared, the outer diameter of the inner ring magnetic ring 1 in the step (1) is 45mm, the inner diameter is 35mm, and the thickness is 5mm.
Example 11:
the present embodiment provides a composite magnetic ring and a preparation method thereof, and the preparation method refers to the preparation method in embodiment 1, and the difference is that: when the composite magnetic ring is prepared, the outer diameter of the inner ring magnetic ring 1 in the step (1) is 35mm, the inner diameter is 33mm, and the thickness is 1mm.
Example 12:
the present embodiment provides a composite magnetic ring and a preparation method thereof, and the preparation method refers to the preparation method in embodiment 6, and the difference is that: when the composite magnetic ring is prepared, the outer diameter of the outer ring magnetic ring 2 in the step (2) is 65mm, the inner diameter is 45mm, and the thickness is 10mm.
Example 13:
the present embodiment provides a composite magnetic ring and a preparation method thereof, and the preparation method refers to the preparation method in embodiment 6, and the difference is that: when the composite magnetic ring is prepared, the outer diameter of the outer ring magnetic ring 2 in the step (2) is 47mm, the inner diameter is 45mm, and the thickness is 1mm.
Example 14:
the present embodiment provides a composite magnetic ring and a preparation method thereof, and the preparation method refers to the preparation method in embodiment 6, and the difference is that: when the composite magnetic ring is prepared, the height of the trapezoid ribs 11 of the inner ring magnetic ring 1 in the step (1) is 1/3 of the thickness of the outer ring magnetic ring 2.
Example 15:
the present embodiment provides a composite magnetic ring and a preparation method thereof, and the preparation method refers to the preparation method in embodiment 6, and the difference is that: when the composite magnetic ring is prepared, the height of the trapezoid ribs 11 of the inner ring magnetic ring 1 in the step (1) is 3/4 of the thickness of the outer ring magnetic ring 2.
Example 16:
the present embodiment provides a composite magnetic ring and a preparation method thereof, and the preparation method refers to the preparation method in embodiment 6, and the difference is that: when the composite magnetic ring is prepared, square ribs are arranged on the outer wall of the inner ring magnetic ring 1 in the step (1), namely, the included angle between the side edges and the horizontal plane is 90 degrees.
Comparative example 1:
the present comparative example provides a composite magnetic ring and a method of manufacturing the same, which is different from the manufacturing method of example 1 only in that: pure PA12 material is adopted to replace soft magnetic composite material.
The composite magnetic rings obtained in examples 1 to 16 and comparative example 1 were tested for average apparent magnetic strength at 23℃using a three-dimensional apparent magnetic tester, and the results are shown in Table 1.
TABLE 1
By adopting the preparation method disclosed by the embodiments 1-9 of the invention, the average surface magnetism of the prepared composite magnetic ring can reach 2510Gs or more; compared with the embodiment 6, the thickness of the inner ring magnetic ring in the embodiment 10 is too thick, the surface magnetic of the composite magnetic ring is slightly increased, but the dosage of the soft magnetic composite material and the total weight of the composite magnetic ring are increased more; compared with the embodiment 1, the thickness of the inner magnetic ring in the embodiment 11 is too thin, and the surface magnetism of the composite magnetic ring is reduced; compared with the embodiment 6, the thickness of the outer ring magnetic ring in the embodiment 12 is too thick, the surface magnetic of the composite magnetic ring is increased more, but the dosage of the permanent magnet composite material and the total weight of the composite magnetic ring are increased more, and the utilization efficiency of the permanent magnet composite material is obviously lower; compared with the embodiment 6, the thickness of the outer ring magnetic ring in the embodiment 13 is too thin, so that the surface magnetic property of the composite magnetic ring is obviously reduced; compared with the embodiment 6, the height of the trapezoid ribs of the inner ring magnetic ring in the embodiment 14 is too small, so that the surface magnetism of the composite magnetic ring is reduced; compared with the embodiment 6, the height of the trapezoid ribs of the inner ring magnetic ring in the embodiment 15 is too large, the surface magnetism is not obviously improved, but the outer ring magnetic ring is cracked in the cooling process after injection; compared with the embodiment 6, in the embodiment 16, the inner ring magnetic ring adopts square ribs, the surface magnetic property of the magnetic ring is slightly improved, but the composite magnetic ring is cracked in the process of reliability test (such as cold and hot impact).
It can be seen from the above embodiments and comparative examples that the composite magnetic ring fully utilizes the magnetic characteristics of the soft magnetic composite material and the permanent magnetic composite material, couples the soft magnetic composite material and the permanent magnetic composite material, designs a novel structure of the inner ring of the soft magnetic composite material and the outer ring of the permanent magnetic composite material, greatly improves the average surface magnetic strength of the composite magnetic ring by further designing a magnetic circuit, and can enable the surface magnetic field of the composite magnetic ring to be more than 2510Gs by further controlling the conditions of the size, the thickness and the like of each magnetic ring in the design process; the composite magnetic ring has the advantages of light weight, high surface magnetic property and good strength, has excellent dynamic balance characteristic, is suitable for various micro-special motors, has simple process flow and high production efficiency, and has good industrial application prospect.
The present invention is described in detail by the above examples, but the present invention is not limited to the above detailed methods, i.e., it does not mean that the present invention must be practiced depending on the above detailed methods. It should be apparent to those skilled in the art that any modifications, equivalent substitutions for operation of the present invention, addition of auxiliary operations, selection of specific modes, etc., are intended to fall within the scope of the present invention and the scope of the disclosure.
Claims (18)
1. The composite magnetic ring is characterized by comprising an inner ring magnetic ring and an outer ring magnetic ring which are coaxial;
the outer wall of the inner ring magnetic ring is provided with an axial trapezoid rib;
the inner wall of the outer ring magnetic ring is provided with a groove matched with the trapezoid rib of the inner ring magnetic ring; magnetic fields are arranged between adjacent grooves, and the adjacent magnetic fields are in different orientations;
the inner ring magnetic ring is made of soft magnetic composite materials; the outer ring magnetic ring is made of a permanent magnet composite material;
the outer diameter of the inner ring magnetic ring is 35-45mm, and the inner diameter of the inner ring magnetic ring is 30-38mm; the thickness of the inner ring magnetic ring is 2.5-3.5mm;
the outer diameter of the outer ring magnetic ring is 40-50mm, and the inner diameter is 30-45mm; the thickness of the outer ring magnetic ring is 2.5-7.5mm;
the height of the trapezoid ribs of the inner ring magnetic ring is 1/2-2/3 of the thickness of the outer ring magnetic ring; the included angle between the side edge of the trapezoid cross section of the trapezoid rib and the horizontal plane is 45-60 degrees;
the composite magnetic ring is obtained by adopting the following preparation method, and the preparation method comprises the following steps:
(1) Preparing an inner ring magnetic ring by adopting a soft magnetic composite material through an injection process;
(2) Preparing an outer ring magnetic ring by an injection process on the basis of the inner ring magnetic ring, thereby obtaining a composite magnetic ring;
wherein, a magnetic field is arranged in a mould used for preparing the outer ring magnetic ring, and the magnetic field strength is 0.8-1.0T;
the preparation of the soft magnetic composite material in the step (1) comprises the following steps:
(1) preparing a surface treatment solution: mixing phosphoric acid, an alcohol solution, a zinc source and water-soluble resin to obtain a surface treatment solution;
(2) and mixing the obtained surface treatment solution with iron powder, a silane coupling agent and a high polymer material in sequence, mixing and granulating to obtain the soft magnetic composite material.
2. The composite magnetic ring as recited in claim 1, wherein the number of trapezoidal ribs is 6-10.
3. The composite magnetic ring as recited in claim 1, wherein the surface magnetic profile of the composite magnetic ring is sinusoidal.
4. The composite magnetic ring as recited in claim 1, wherein an average surface magnetic peak value of the composite magnetic ring is not less than 2500Gs.
5. A method of preparing a composite magnetic ring as recited in any one of claims 1-4, wherein the method of preparing comprises the steps of:
(1) Preparing an inner ring magnetic ring by adopting a soft magnetic composite material through an injection process;
(2) Preparing an outer ring magnetic ring by an injection process on the basis of the inner ring magnetic ring, thereby obtaining a composite magnetic ring;
wherein, a magnetic field is arranged in a mould used for preparing the outer ring magnetic ring, and the magnetic field strength is 0.8-1.0T;
the preparation of the soft magnetic composite material in the step (1) comprises the following steps:
(1) preparing a surface treatment solution: mixing phosphoric acid, an alcohol solution, a zinc source and water-soluble resin to obtain a surface treatment solution;
(2) and mixing the obtained surface treatment solution with iron powder, a silane coupling agent and a high polymer material in sequence, mixing and granulating to obtain the soft magnetic composite material.
6. The method of manufacturing a composite magnetic ring as recited in claim 5, wherein the preparing of the surface treatment solution in step (1) more specifically comprises: mixing and heating phosphoric acid, absolute ethyl alcohol, water, a zinc source and water-soluble resin to obtain a surface treatment solution.
7. The method of manufacturing a composite magnetic ring as recited in claim 5, wherein the zinc source comprises zinc oxide.
8. The method of claim 5, wherein the water-soluble resin comprises any one or a combination of at least two of polypropylene, polyamide, or polyethylene glycol.
9. The method for preparing a composite magnetic ring according to claim 5, wherein the temperature of the mixing in the step (1) is 70-90 ℃.
10. The method for preparing a composite magnetic ring as recited in claim 5, wherein the particle size of the iron powder in the step (2) is 50-100 μm.
11. The method for manufacturing a composite magnetic ring according to claim 5, wherein the magnetic permeability of the iron powder in the step (2) is 600-800H/m.
12. The method of manufacturing a composite magnetic ring as recited in claim 5, wherein the saturation magnetization of the iron powder in step (2) is 1.4-1.8T.
13. The method for preparing a composite magnetic ring according to claim 5, wherein the mass ratio of the surface treatment solution to the iron powder in the step (2) is 1 (9-11).
14. The method for preparing a composite magnetic ring according to claim 5, wherein the silane coupling agent in the step (2) is added in an amount of 0.5-1.5% of the mass of the iron powder.
15. The method of claim 5, wherein the polymer material in step (2) comprises any one or a combination of at least two of PP, PA6, PA12, POM, and PPs.
16. The method for preparing a composite magnetic ring according to claim 5, wherein the temperature of the mixing in the step (2) is 130-160 ℃.
17. The method of claim 5, wherein the magnetic field waveform set in the mold in step (2) is a sine waveform.
18. The method of manufacturing a composite magnetic ring as recited in claim 5, wherein the step (2) is performed in a mold.
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| CN102130543A (en) * | 2010-01-15 | 2011-07-20 | 周红卫 | Soft magnetic materials and related process for producing magnetic conductive components in motor |
| JP2016092262A (en) * | 2014-11-06 | 2016-05-23 | 住友金属鉱山株式会社 | Material for bond magnet formation and bond magnet |
| CN105070450A (en) * | 2015-08-10 | 2015-11-18 | 天长市昭田磁电科技有限公司 | High-insulation magnetic core material |
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| WO2021103467A1 (en) * | 2019-11-28 | 2021-06-03 | 中国计量大学 | Method for preparing high-performance soft magnetic composite material and magnetic ring thereof |
| CN214476876U (en) * | 2021-03-26 | 2021-10-22 | 天津奥纳富霖科技有限公司 | Composite magnetic core for anti-direct-current component transformer |
| CN114496462A (en) * | 2022-02-14 | 2022-05-13 | 钢铁研究总院有限公司 | Permanent magnet ring assembly and preparation method thereof |
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