CN111933379A - Magnetic field device and process for preparing radial radiation rare earth permanent magnetic tile - Google Patents
Magnetic field device and process for preparing radial radiation rare earth permanent magnetic tile Download PDFInfo
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- CN111933379A CN111933379A CN202010570815.9A CN202010570815A CN111933379A CN 111933379 A CN111933379 A CN 111933379A CN 202010570815 A CN202010570815 A CN 202010570815A CN 111933379 A CN111933379 A CN 111933379A
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- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
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- H01F7/02—Permanent magnets [PM]
- H01F7/0273—Magnetic circuits with PM for magnetic field generation
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Abstract
The invention relates to a magnetic field device for preparing radial radiation rare earth permanent magnetic tiles, which comprises an N-pole pulse orientation coil and an S-pole pulse orientation coil, wherein the pole head of the N-pole pulse orientation coil is in a convex arc shape and is filled with a concave arc-shaped stainless steel non-magnetic conductive compensation plate, and the pole head of the S-pole pulse orientation coil is in a concave arc shape and is filled with a convex arc-shaped stainless steel non-magnetic conductive compensation plate, so that the magnetic field device is convenient to be matched with a block magnet mold. The special convex-concave arc pole heads generate a strong radiation orientation magnetic field, so that the prepared block magnet is ensured, the radial radiation orientation magnetic shoe prepared after cutting is adopted, the magnetic field direction is radiation orientation in the use of the motor, the phenomenon of magnetic line repulsion at the central part of the magnetic shoe is slight compared with the radial magnetic shoe in common parallel orientation, the surface magnetism at the center of the magnetic shoe is higher than that of the radial magnetic shoe in common parallel orientation, the magnetic field generated by the magnet with the same volume is greatly improved, and the running efficiency of the motor is improved.
Description
Technical Field
The invention relates to a magnetic field generating device and a process, in particular to a magnetic field device and a process for preparing radial radiation rare earth permanent magnetic tiles.
Background
The existing rare earth permanent magnet sintered neodymium iron boron tile-shaped magnet for the direct current motor adopts a square or tile-shaped block magnet which is formed firstly, and then is cut and ground into a radial tile-shaped magnet. The square or tile-shaped block magnet is oriented in a parallel magnetic field when being formed, and the orientation mode is that because the magnetic lines of force are parallel, the radial magnetic shoe prepared by the square or tile-shaped block magnet adopting the method is influenced by the shape of the inner arc if an inner arc magnetic field is used, the magnetic lines of force of the inner arc are easy to repel each other, so that the surface magnetism of the central point of the inner arc is very low, and because the magnetic lines of force are basically parallel if an outer arc magnetic field is used, the requirement of the motor magnetic field cannot be optimally met; when the motor is used, a radial magnetic field is needed, so that a part of magnetic energy of the magnetic shoes in parallel orientation is wasted and lost; the radiation ring magnet is an optimal solution, but the radiation ring magnet is influenced by the preparation process, the outer diameter and the wall thickness of a prepared circular ring are very limited, namely, the outer diameter is too large, the wall thickness exceeds a certain thickness, the radiation orientation is not complete, and the radiation ring magnet can only be used for a smaller direct current motor. A magnetic field device similar to a radiation ring magnet is adopted to press a single radial radiation magnetic tile, and due to the influences of factors such as poor powder flowability, uneven powder distribution and the like, a plurality of problems such as deformation, cracking and the like are not solved at present. The existing magnetic field device of the blocky rare earth permanent magnet consists of a coil made of a square hollow copper pipe, an insulating layer pure iron core and a pure iron pole head, wherein the end surface of the pure iron pole head is a plane and can only be oriented in parallel.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a magnetic field device and a process for preparing radial radiation rare earth permanent magnetic tiles.
The invention is realized by the following technical scheme:
the magnetic field device for preparing the radial radiation rare earth permanent magnet tile is characterized by comprising an N-pole pulse orientation coil and an S-pole pulse orientation coil, wherein the N-pole pulse orientation coil and the S-pole pulse orientation coil are respectively composed of a coil made of a square hollow copper pipe, an insulating layer, a pure iron core and a pure iron pole head, and pure water can be introduced into the middle of the coil made of the square hollow copper pipe for cooling.
The magnetic field device for preparing the radial radiation rare earth permanent magnet tile is characterized in that the pole head ends of an N-pole pulse orientation coil and an S-pole pulse orientation coil assembled with a die respectively comprise a pure iron pole head and a stainless steel non-magnetic compensation plate.
The magnetic field device for preparing the radial radiation rare earth permanent magnetic tile is characterized in that the end part of a pure iron pole head on an S-pole pulse orientation coil is in a concave arc shape; the end part of the pure iron pole head on the N pole pulse orientation coil is in a convex arc shape, and the radian of the concave arc shape is the same as that of the convex arc shape.
The magnetic field device for preparing the radial radiation rare earth permanent magnetic tile is characterized in that the stainless steel non-magnetic compensation plate matched with the pure iron pole head on the S-pole pulse orientation coil is a convex arc compensation plate, and the stainless steel non-magnetic compensation plate matched with the pure iron pole head on the N-pole pulse orientation coil is a concave arc compensation plate.
The magnetic field device for preparing the radial radiation rare earth permanent magnetic tile is characterized in that a pure iron pole head is connected with a pure iron core through a stainless steel bolt, and a stainless steel non-magnetic compensation plate is bonded with the pure iron pole head.
The magnetic field device for preparing the radial radiation rare earth permanent magnetic tile is characterized in that one sides, far away from a pure iron pole head, of the convex arc compensation plate and the concave arc compensation plate are both arranged to be planar, and the convex arc compensation plate and the concave arc compensation plate are convenient to be matched with a mold.
The process for preparing the magnetic shoe for radial radiation rare earth by adopting the magnetic field device of claim 1 is characterized by comprising the following steps:
1) adding the powder into a die, and carrying out orientation molding under a magnetic field of not less than 2.5T by using the magnetic field generating device of claim 1, wherein the magnetic field strength is specifically that the tile-shaped die carries out magnetic field orientation limit identification through the tile-shaped outer arc orientation when the die is installed; the square mold is provided with N, S polar marks of the orientation magnetic field direction during orientation on a pressure head to prepare a radiation-oriented square or tile-shaped massive magnet green body, and the green body is taken out for vacuum packaging after demagnetization is finished;
2) carrying out cold isostatic pressing treatment on the square or tile-shaped block-shaped magnet green body prepared in the step 1), stripping, vacuum packaging and then loading into a sintering box;
3) sintering, aging and tempering the square or tile-shaped block-shaped magnet green body prepared in the step 2) to obtain the neodymium iron boron magnet, wherein the sintering temperature is 970-1120 ℃, the aging temperature is 850-950 ℃, and the tempering temperature is 450-600 ℃;
4) grinding and cutting the neodymium iron boron magnet prepared in the step 3) to prepare the radial radiation orientation magnetic shoe.
The process for preparing the magnetic shoe for the radial radiation rare earth is characterized in that when the magnetic shoe using the outer arc magnetic field is prepared, the oriented block blank is radiated, and the orientation direction of the outer arc of the magnetic shoe is consistent with that of the block blank so as to obtain a larger outer arc magnetic field; when the magnetic shoe using the magnetic field of the inner arc is prepared, the oriented block blank is radiated, and the orientation direction of the outer arc of the magnetic shoe is opposite to that of the block blank, so that a larger inner arc magnetic field is obtained.
The magnetic shoe magnet has reasonable structure and arrangement, is convenient to realize, has simple and feasible preparation process, ensures that the magnetic field direction of the radial magnetic shoe magnet close to the radiation orientation is consistent with the using direction when the motor is used, has slight magnetic line repulsion phenomenon at the central part of the magnetic shoe compared with the radial magnetic shoe of the common parallel orientation, has more than 10 percent of surface magnetism at the outer arc center of the magnetic shoe than the radial magnetic shoe of the common parallel orientation, and has more than 25 percent of surface magnetism at the inner arc center of the magnetic shoe than the radial magnetic shoe of the common parallel orientation.
Drawings
FIG. 1 is a schematic view of the structure of the magnetic field apparatus of the present invention;
FIG. 2 is a schematic view of the magnetic lines of force of the radially oriented magnetic shoe;
in the figure, 1-N pole pulse orientation coil, 2-S pole pulse orientation coil, 3-coil, 4-insulating layer, 5-pure iron core, 6-pure iron pole head, 7-mould, 8-stainless steel non-magnetic conductive compensation plate, 81-convex arc compensation plate and 82-concave arc compensation plate.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings, and specific embodiments are given.
As shown in fig. 1, the magnetic field generating device for preparing the bulk radiation orientation rare earth permanent magnet comprises an N-pole pulse orientation coil and an S-pole pulse orientation coil, wherein the orientation coils are respectively composed of a coil made of a square hollow copper pipe, an insulating layer, a pure iron core and a pure iron pole head, pure water can be filled in the middle of the coil made of the square hollow copper pipe for cooling, the pole head ends of the N-pole pulse orientation coil and the S-pole pulse orientation coil assembled with a die respectively comprise a pure iron pole head and a stainless steel non-magnetic compensation plate, the pure iron pole head is connected with the pure iron core through a stainless steel bolt, and the stainless steel non-magnetic compensation plate is bonded with the pure iron pole head.
The end part of the pure iron pole head on the S pole pulse orientation coil is in a concave arc shape; the pure iron pole head on the N pole pulse orientation coil is in a convex arc shape at the end part, and the radian of the concave arc shape is the same as that of the convex arc shape. The stainless steel non-magnetic compensation plate matched with the pure iron pole head on the S-pole pulse orientation coil is a convex arc compensation plate, the stainless steel non-magnetic compensation plate matched with the pure iron pole head on the N-pole pulse orientation coil is a concave arc compensation plate, and one sides of the convex arc compensation plate and the concave arc compensation plate, which are far away from the pure iron pole head, are both arranged to be planar, so that the convex arc compensation plate and the concave arc compensation plate can be conveniently matched with a massive magnet mold.
The process for preparing the magnetic shoe for radial radiation rare earth by adopting the magnetic field device comprises the following steps:
1) adding the powder into a die, and carrying out orientation molding under a magnetic field of not less than 2.5T by using the magnetic field generating device of claim 1, wherein specifically, the magnetic field orientation limit identification is carried out on the tile-shaped outer arc orientation of the tile-shaped die when the tile-shaped die passes through the die; the square mold is provided with N, S polar marks of the orientation magnetic field direction during orientation on a pressure head to prepare a radiation-oriented square or tile-shaped massive magnet green body, and the green body is taken out for vacuum packaging after demagnetization is finished; 2) carrying out cold isostatic pressing treatment on the square or tile-shaped block-shaped magnet green body prepared in the step 1), stripping, vacuum packaging and then loading into a sintering box; 3) sintering, aging and tempering the square or tile-shaped block-shaped magnet green body prepared in the step 2) to obtain the neodymium iron boron magnet, wherein the sintering temperature is 970-1120 ℃, the aging temperature is 850-950 ℃, and the tempering temperature is 450-600 ℃; 4) grinding and cutting the neodymium iron boron magnet prepared in the step 3) to prepare the radial radiation orientation magnetic shoe.
When the magnetic shoe using the outer arc magnetic field is prepared, the oriented block blank is radiated, and the orientation direction of the outer arc of the magnetic shoe is consistent with that of the block blank so as to obtain a larger outer arc magnetic field; when the magnetic shoe using the inner arc magnetic field is prepared, the oriented block blank is radiated, and the orientation direction of the outer arc of the magnetic shoe is opposite to that of the block blank, so that a larger inner arc magnetic field is obtained.
As shown in figure 2, the magnetic field device prepared by the device and the process has the advantages that the block-shaped radiation orientation blank and the radiation orientation magnetic shoe are similar to radial radiation orientation due to orientation deflection, the repulsion of magnetic lines of an inner arc is reduced, and the surface magnetism of the central point of the inner arc is greatly improved.
Example 1
1) Adding 38SH performance powder into a square mould, carrying out orientation forming under the magnetic field of not less than 2.5T by using the magnetic field generating device of claim 1, arranging N, S polar marks on the pressure head in the magnetic field direction during orientation to prepare a radiation-oriented square magnet green body, and taking out the green body for vacuum packaging after demagnetization is finished; 2) carrying out cold isostatic pressing treatment on the square magnet green body prepared in the step 1), stripping, vacuum packaging and then loading into a sintering box; 3) sintering, aging and tempering the square magnet green body prepared in the step 2) to obtain the neodymium iron boron magnet, wherein the sintering temperature is 1070 ℃, the aging temperature is 900 ℃, and the tempering temperature is 500 ℃; 4) and (3) keeping the outer arc of the square magnet prepared in the step 3) consistent with the orientation direction of the square blank, and grinding and cutting to prepare the radial radiation orientation magnetic shoe.
Example 2
1) Adding 38 SH-performance powder into a tile-shaped mold, wherein the outer arc direction of the tile-shaped mold faces to an N pole, carrying out orientation molding by using the magnetic field generating device of claim 1 in a magnetic field of not less than 2.5T to prepare a radiation-oriented massive tile-shaped magnet green body, and taking out the green body for vacuum packaging after demagnetization; 2) carrying out cold isostatic pressing treatment on the block tile-shaped magnet green body prepared in the step 1), stripping, vacuum packaging and then loading into a sintering box; 3) sintering, aging and tempering the massive tile-shaped magnet green body prepared in the step 2) to obtain the neodymium iron boron magnet, wherein the sintering temperature is 1070 ℃, the aging temperature is 900 ℃, and the tempering temperature is 500 ℃; 4) and 3) grinding and cutting the outer arc of the block-shaped tile-shaped magnet prepared in the step 3) in a direction opposite to the orientation direction of the square blank to prepare the radial radiation orientation magnetic tile.
Comparative example 1
1) Adding 38 SH-performance powder into a mold, performing magnetic field orientation molding under a magnetic field not lower than 2.5T by using a common parallel orientation magnetic field generating device to obtain a square or tile-shaped block-shaped magnet green body, and taking out the green body for vacuum packaging after demagnetization is finished; 2) carrying out cold isostatic pressing treatment on the square or tile-shaped block-shaped magnet green body prepared in the step 1), stripping, vacuum packaging and then loading into a sintering box; 3) sintering, aging and tempering the square or tile-shaped block-shaped magnet green body prepared in the step 2) to obtain the neodymium iron boron magnet, wherein the sintering temperature is 1070 ℃, the aging temperature is 900 ℃, and the tempering temperature is 500 ℃; 4) grinding and cutting the square or tile-shaped block magnet prepared in the step 3) to prepare the radial radiation orientation magnetic shoe.
Example 1 and comparative example 1, both using the outer arc magnetic field, were processed into R36 ar 36 ar 41.3 ° 3 magnetic shoes, which were then magnetized and the apparent magnetization of the center point of the inner arc was measured, and the results are shown in table 1.
TABLE 1
| Outer arc center surface magnet (Gs) | Outer arc corner surface magnet (Gs) | Surface magnetic difference (Gs) | |
| Example 1 | 2000 | 2300 | 300 |
| Comparative example 1 | 1760 | 2310 | 550 |
Both example 2 and comparative example 1, which used tiles with inner arc magnetic field, were processed into R36R 36 41.3 ° 3 tiles, which were then magnetized and the apparent magnetism measured at the center point of the inner arc, and the results are shown in table 2.
TABLE 2
| Inner arc center surface magnet (Gs) | Inner arc corner surface magnet (Gs) | Surface magnetic difference (Gs) | |
| Example 2 | 1500 | 3000 | 1500 |
| Comparative example 1 | 440 | 3390 | 2950 |
From the comparison, it can be seen that the radial radiation rare earth permanent magnet shoe prepared by processing the radial orientation square or block shoe-shaped magnet prepared by the magnetic field generating device with the special-shaped pole head of the invention has the advantages that the surface magnetism of the outer arc center of the magnet shoe of the embodiment 1 using the outer arc magnetic field is 12% higher and the surface magnetism of the inner arc center of the magnet shoe of the embodiment 2 using the inner arc magnetic field is 3 times higher than that of the magnet shoe of the comparative example 1. From the comparison, it can be seen that the magnetic field of the outer arc or the inner arc is greatly improved compared with the central surface magnetism of the comparative example, and the surface magnetism difference of the center and the corner is obviously reduced, so that the magnetic fields of the center and the corner of the magnet are more uniform, and the magnetic field distribution waveform is more favorable for improving the working efficiency of the motor.
Claims (8)
1. The magnetic field device for preparing the radial radiation rare earth permanent magnetic tile is characterized by comprising an N-pole pulse orientation coil (1) and an S-pole pulse orientation coil (2), wherein the N-pole pulse orientation coil (1) and the S-pole pulse orientation coil (2) are respectively composed of a coil (3) made of a square hollow copper pipe, an insulating layer (4), a pure iron core (5) and a pure iron pole head (6).
2. A magnetic field device for preparing radial radiation rare earth permanent magnet tiles according to claim 1, wherein the pole head ends of the N-pole pulse orientation coil (1) and the S-pole pulse orientation coil (2) assembled with the die (7) comprise a pure iron pole head (6) and a stainless steel non-magnetic conductive compensation plate (8).
3. A magnetic field device for preparing radial radiation rare earth permanent magnet tiles as claimed in claim 1, wherein the end of the pure iron pole head (6) on the S-pole pulse orientation coil (2) is in a concave arc shape; the end part of the pure iron pole head (6) on the N pole pulse orientation coil (1) is in a convex arc shape, and the radian of the concave arc shape is the same as that of the convex arc shape.
4. A magnetic field device for producing radially radiating rare-earth permanent magnet tiles according to claim 2, wherein the stainless steel non-magnetic compensation plate fitted with the pure iron pole head on the S-pole pulse orientation coil is a convex arc compensation plate (81), and the stainless steel non-magnetic compensation plate fitted with the pure iron pole head on the N-pole pulse orientation coil is a concave arc compensation plate (82).
5. A magnetic field device for preparing radial radiation rare earth permanent magnet tiles according to claim 1, characterized in that the pure iron pole head (6) is connected with the pure iron core (5) through stainless steel bolts, and the stainless steel non-magnetic compensation plate (8) is arranged in a bonding way with the pure iron pole head (6).
6. A magnetic field device for preparing radial radiation rare earth permanent magnet tiles according to claim 4, wherein the sides of the convex arc compensation plate (81) and the concave arc compensation plate (82) far away from the pure iron pole head (6) are both arranged to be planar so as to be convenient for matching with the mold (7).
7. A process for preparing a magnetic shoe for radially radiating rare earth using the magnetic field apparatus of claim 1, comprising the steps of:
1) adding the powder into a die, and carrying out orientation molding under a magnetic field of not less than 2.5T by using the magnetic field generating device of claim 1, wherein specifically, the magnetic field orientation limit identification is carried out on the tile-shaped outer arc orientation of the tile-shaped die when the tile-shaped die passes through the die; the square mold is provided with N, S polar marks of the orientation magnetic field direction during orientation on a pressure head to prepare a radiation-oriented square or tile-shaped massive magnet green body, and the green body is taken out for vacuum packaging after demagnetization is finished;
2) carrying out cold isostatic pressing treatment on the square or tile-shaped block-shaped magnet green body prepared in the step 1), stripping, vacuum packaging and then loading into a sintering box;
3) sintering, aging and tempering the square or tile-shaped block-shaped magnet green body prepared in the step 2) to obtain the neodymium iron boron magnet, wherein the sintering temperature is 970-1120 ℃, the aging temperature is 850-950 ℃, and the tempering temperature is 450-600 ℃;
4) grinding and cutting the neodymium iron boron magnet prepared in the step 3) to prepare the radial radiation orientation magnetic shoe.
8. A process for preparing a magnetic shoe for radially radiating rare earth as claimed in claim 7, wherein in preparing a magnetic shoe using an outer arc magnetic field, the oriented block blank is radiated, and the outer arc of the magnetic shoe is kept consistent with the orientation direction of the block blank to obtain a larger outer arc magnetic field; when the magnetic shoe using the inner arc magnetic field is prepared, the oriented block blank is radiated, and the orientation direction of the outer arc of the magnetic shoe is opposite to that of the block blank, so that a larger inner arc magnetic field is obtained.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010570815.9A CN111933379A (en) | 2020-06-22 | 2020-06-22 | Magnetic field device and process for preparing radial radiation rare earth permanent magnetic tile |
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| CN202010570815.9A CN111933379A (en) | 2020-06-22 | 2020-06-22 | Magnetic field device and process for preparing radial radiation rare earth permanent magnetic tile |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112600318A (en) * | 2020-12-22 | 2021-04-02 | 湖南航天磁电有限责任公司 | Ferrite product capable of reducing motor tooth space torque and forming die thereof |
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2020
- 2020-06-22 CN CN202010570815.9A patent/CN111933379A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112600318A (en) * | 2020-12-22 | 2021-04-02 | 湖南航天磁电有限责任公司 | Ferrite product capable of reducing motor tooth space torque and forming die thereof |
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