CN109994308B - Manufacturing method of combined permanent magnet - Google Patents
Manufacturing method of combined permanent magnet Download PDFInfo
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- CN109994308B CN109994308B CN201910038080.2A CN201910038080A CN109994308B CN 109994308 B CN109994308 B CN 109994308B CN 201910038080 A CN201910038080 A CN 201910038080A CN 109994308 B CN109994308 B CN 109994308B
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- permanent magnet
- monomer
- permanent 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
- 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
- H01F41/0266—Moulding; Pressing
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
Abstract
The invention discloses a manufacturing method of a combined permanent magnet. The method comprises the steps of combining a plurality of single permanent magnets into one permanent magnet, and fixing and protecting the combined permanent magnet through a sheath. The invention has reasonable design and simple structure, and the single permanent magnets with small volume and insulated surface are combined into the permanent magnet with large volume by changing the production process of the permanent magnet; and through installing a layer of good conductive shielding metal layer on the outer surface of the permanent magnet, the eddy current generated by high-frequency harmonic wave is prevented from acting on the permanent magnet, the loss of the permanent magnet is further reduced, the purpose of low loss is achieved, the manufacturing cost of the small-volume single permanent magnet is low, the requirement on manufacturing equipment is also reduced, and the processing technology is simple.
Description
Technical Field
The invention relates to the technical field of permanent magnets, in particular to a manufacturing method of a combined permanent magnet.
Background
At present, the known sintered permanent magnet has the advantages of large residual magnetic strength and high magnetic energy product, and the like, and is widely applied to various permanent magnet motors for automobiles. The permanent magnet motor for the automobile has the characteristics of high power, high rotating speed, severe operating environment and the like, the motor generally adopts a scheme of internally arranging bar-shaped permanent magnets, the permanent magnets are generally manufactured into rectangular permanent magnets with certain lengths, and then a plurality of permanent magnets are gradually arranged in corresponding grooves of a motor rotor.
However, the conventional manufacturing method has the following disadvantages: 1. the eddy current loss of the permanent magnet is large; the sintered permanent magnet has high electrical conductivity, the eddy current loss of the permanent magnet is in direct proportion to the size of the permanent magnet, and the eddy current loss is large when the permanent magnet is single and large. 2. The surface protection treatment of the permanent magnet is difficult and the pollution is great; the surface of the permanent magnet is generally treated by surface protection such as zinc plating, nickel plating, spraying epoxy and the like. Several treatment methods require special equipment for treatment, and the pollution is caused by the volatilization of all heavy metal sewage or benzene. 3. The utilization rate of permanent magnet materials is low; the existing permanent magnet can only be manufactured into a rectangular permanent magnet with a certain length, a large amount of leftover materials can be generated in the processing process, the leftover materials can only be treated as waste materials, the waste is large, and the material utilization rate is low. 4. The permanent magnet has high installation cost; the permanent magnet needs to be manufactured into a small size, so that each motor needs to use a plurality of single permanent magnets, the mounting difficulty is improved when the permanent magnet is mounted, and a large amount of mounting time is needed, so that the mounting cost is improved. 5. The permanent magnet has high cost; because the permanent magnet needs surface protection treatment, the material utilization rate is low, and the transportation of protection packaging materials causes high cost of the permanent magnet.
Disclosure of Invention
The invention aims to provide a manufacturing method of a combined permanent magnet for reducing eddy current loss.
The object of the invention is thus achieved.
A method for manufacturing a combined permanent magnet, comprising: comprises the following steps of (a) carrying out,
the method comprises the following steps: crushing rare earth materials, performing compression molding and sintering to obtain rectangular single permanent magnets;
step two: polishing the surfaces of the monomer permanent magnets to prepare a first monomer permanent magnet, a second monomer permanent magnet and a third monomer permanent magnet, wherein the middle part of the first monomer permanent magnet is polished with a groove along the width direction, one end of the second monomer permanent magnet is polished with a step along the width direction, and the surface of the third monomer permanent magnet is polished to be flat;
step three: determining the combination mode of the three single permanent magnets in the step two according to the width of the required permanent magnet, and combining the three single permanent magnets into a permanent magnet with at least one straight-line groove;
step four: molding the non-magnetic high-conductivity metal material into a sheath;
step five: coating an insulating adhesive on the surfaces of the monomer permanent magnets required in the third step, bonding the monomer permanent magnets into permanent magnets, and putting the permanent magnets into the sheath;
step six: using a tool to seal the permanent magnet in the fifth step;
step seven: baking and curing the permanent magnet in the sixth step by using heating equipment;
step eight: and c, magnetizing the permanent magnet in the step seven by using a magnetizing device.
More specifically, the depth of the groove in the first single permanent magnet is 0.5mm, and the width of the groove is 2 mm; the depth of the step in the second monomer permanent magnet is 0.5mm, and the width of the step in the second monomer permanent magnet is 1 mm; the depth of the straight line groove in the permanent magnet is 0.5mm, and the width is 2 mm.
More specifically, the sheath is made of a copper plate with the thickness of 0.2mm-0.35mm, the surface of the copper plate is subjected to electrophoresis protection treatment, and the sheath is in a tile shape.
More specific scheme, the frock includes left pusher, right pusher and pressure head, and left pusher and right pusher push the both ends of tile shape sheath to sharp recess department, and the both ends contact of tile shape sheath forms the arch, and the pressure head is impressed the arch in the sharp recess.
More specifically, the insulating adhesive is an epoxy adhesive.
The utility model has the advantages as follows:
(1) the invention has reasonable design and simple structure, and the single permanent magnets with small volume and insulated surface are combined into the permanent magnet with large volume by changing the production process of the permanent magnet; and through installing a layer of conductive good shielding metal layer (sheath) on the outer surface of the permanent magnet, cut off the eddy current produced by the high frequency harmonic to act on the permanent magnet, further reduce the loss of the permanent magnet, achieve the goal of low loss, and the monomer permanent magnet of small volume has low manufacturing cost, also reduce the requirement to the manufacturing equipment, the processing technology is simple.
(2) The single permanent magnet is rectangular, and is not easy to deform during sintering due to small volume, and only simple grinding is needed after molding without linear cutting processing, so that the consumption of leftover materials and the processing time in the manufacturing process of the permanent magnet are reduced.
(3) The single permanent magnets can be combined into an ultra-large permanent magnet through the sheath made of the shielding metal layer, so that the motor is easy to install and operate automatically during manufacturing, and the installation time is reduced.
(4) The combined permanent magnet is protected by the sheath, and the copper plate is subjected to electrophoretic surface protection treatment due to the copper plate used as the sheath, so that the production is more environment-friendly.
Drawings
Fig. 1 is a schematic structural diagram of a first single permanent magnet in the embodiment.
Fig. 2 is a schematic structural diagram of a second single permanent magnet in the embodiment.
Fig. 3 is a schematic structural diagram of a third single permanent magnet in the embodiment.
Fig. 4 is a schematic structural view of the sheath in the embodiment.
Fig. 5 is a schematic view of a combined structure of a first permanent magnet in the embodiment.
Fig. 6 is a schematic view of a combined structure of a second permanent magnet in the embodiment.
Fig. 7 is a schematic view of a combined structure of a third permanent magnet in the embodiment.
Fig. 8 is a schematic view of a combined structure of a fourth permanent magnet in the embodiment.
FIG. 9 is a schematic view of the left and right push heads sealing the jacket in the embodiment.
Fig. 10 is a schematic diagram of the edge sealing of the jacket by the pressure head in the embodiment.
Detailed Description
The invention is further described with reference to the following figures and examples:
embodiment one, referring to fig. 1 to 10, a method for manufacturing a combined permanent magnet includes the steps of,
the method comprises the following steps: crushing rare earth materials, performing compression molding and sintering to obtain rectangular single permanent magnets;
step two: polishing the surfaces of the monomer permanent magnets to prepare a first monomer permanent magnet 1, a second monomer permanent magnet 2 and a third monomer permanent magnet 3, wherein a groove 11 is polished in the middle of the first monomer permanent magnet 1 along the width direction, preferably, the depth of the groove 11 is 0.5mm, the width of the groove is 2mm, one end of the second monomer permanent magnet 2 is polished with a step 21 along the width direction, preferably, the depth of the step 21 is 0.5mm, the width of the step 21 is 1mm, and the surface of the third monomer permanent magnet 3 is polished to be flat;
step three: determining the combination mode of the three single permanent magnets in the step two according to the width of the required permanent magnet, and combining the three single permanent magnets into a permanent magnet with at least one straight-line groove;
step four: molding a non-magnetic conductive high-conductivity metal material into a tile-shaped sheath 4 by a die pressing method, preferably using a copper plate with the thickness of 0.2mm-0.35mm, and carrying out electrophoresis protection treatment on the surface of the copper plate;
step five: adhering epoxy resin adhesive on the surfaces of the monomer permanent magnets required in the third step and a plurality of monomer permanent magnets into permanent magnets, and putting the permanent magnets into the sheath 4;
step six: using a tool to seal edges of the permanent magnets in the step five, wherein the tool comprises a left push head 5, a right push head 6 and a pressure head 7, the left push head 5 and the right push head 6 push two ends of the tile-shaped sheath 4 to the linear groove, the two ends of the tile-shaped sheath 4 are contacted to form a bulge, and the pressure head 7 presses the bulge into the linear groove;
step seven: baking and curing the permanent magnet in the sixth step by using heating equipment;
step eight: and c, magnetizing the permanent magnet in the step seven by using a magnetizing device.
In this embodiment, the permanent magnet may be combined by three kinds of single permanent magnets, and the combination manner has a plurality of:
as shown in fig. 5, a plurality of first individual permanent magnets 1 are arranged side by side in the width direction and are bonded together by epoxy resin adhesive, and the grooves on the first individual permanent magnets 1 are arranged into a straight groove and then fixed into a permanent magnet through a sheath 4.
As shown in fig. 6, a plurality of first individual permanent magnets 1 are arranged side by side along the width direction, a straight line groove is formed by arranging grooves on the first individual permanent magnets 1, a plurality of third individual permanent magnets 3 are divided into two rows and arranged side by side along the width direction, the two rows of third individual permanent magnets 3 are respectively arranged at two ends of the first individual permanent magnets 1 in the length direction, the first individual permanent magnets 1 and the first individual permanent magnets 1, the first individual permanent magnets 1 and the third individual permanent magnets 3, the third individual permanent magnets 3 and the third individual permanent magnets 3 are bonded together through epoxy resin adhesives, and then the permanent magnets are fixed through a sheath 4.
As shown in fig. 7, the plurality of second individual permanent magnets 2 are divided into two rows and arranged side by side in the width direction, the steps of the two rows of second individual permanent magnets 2 are arranged in opposite directions, the second individual permanent magnets 2 are bonded together by an epoxy resin adhesive, the steps of the two rows of second individual permanent magnets 2 are spliced into a linear groove, and then the linear groove is fixed into a permanent magnet through the sheath 4.
As shown in fig. 8, the plurality of second permanent magnets 2 are divided into two rows and arranged side by side in the width direction, the steps of the two rows of second permanent magnets 2 are arranged in opposite directions, the second permanent magnets 2 are bonded together by an epoxy adhesive, the steps of the two rows of second permanent magnets 2 are spliced into a linear groove, the plurality of third permanent magnets 3 are divided into two rows and arranged side by side in the width direction, the two rows of third permanent magnets 3 are respectively arranged at two ends of the second permanent magnets 2 in the length direction, the third permanent magnets 3 and the second permanent magnets 2 are bonded together by the epoxy adhesive, and then the permanent magnets are fixed by the protective sleeve 4.
Of course, the combination of the permanent magnets in this embodiment is not limited to the above combination manners, for example, three single permanent magnets are combined together to form a permanent magnet with a plurality of linear grooves, and the combined permanent magnet has the advantage of low loss.
Claims (5)
1. A method for manufacturing a combined permanent magnet, comprising: comprises the following steps of (a) carrying out,
the method comprises the following steps: crushing rare earth materials, performing compression molding and sintering to obtain rectangular single permanent magnets;
step two: polishing the surfaces of the monomer permanent magnets to prepare a first monomer permanent magnet, a second monomer permanent magnet and a third monomer permanent magnet, wherein the middle part of the first monomer permanent magnet is polished with a groove along the width direction, one end of the second monomer permanent magnet is polished with a step along the width direction, and the surface of the third monomer permanent magnet is polished to be flat;
step three: determining the combination mode of the three single permanent magnets in the step two according to the width of the required permanent magnet, and combining the three single permanent magnets into a permanent magnet with at least one straight-line groove;
step four: molding the non-magnetic high-conductivity metal into a sheath;
step five: coating insulating adhesive on the surfaces of the monomer permanent magnets required in the third step, bonding the monomer permanent magnets into permanent magnets, putting the permanent magnets into a sheath, and exposing two poles of the permanent magnets;
step six: using a tool to seal the permanent magnet in the fifth step;
step seven: baking and curing the permanent magnet in the sixth step by using heating equipment;
step eight: and c, magnetizing the permanent magnet in the step seven by using a magnetizing device.
2. The method of manufacturing a permanent magnet assembly according to claim 1, wherein: the depth of the groove in the first monomer permanent magnet is 0.5mm, and the width of the groove is 2 mm; the depth of the step in the second monomer permanent magnet is 0.5mm, and the width of the step in the second monomer permanent magnet is 1 mm; the depth of the straight line groove in the permanent magnet is 0.5mm, and the width is 2 mm.
3. The method of manufacturing a permanent magnet assembly according to claim 1, wherein: the sheath is made of a copper plate with the thickness of 0.2mm-0.35mm, the surface of the copper plate is subjected to electrophoresis protection treatment, and the sheath is tile-shaped.
4. The method of manufacturing a permanent magnet assembly according to claim 3, wherein: the frock includes left pushing head, right pushing head and pressure head, and left pushing head and right pushing head push the both ends of tile shape sheath to sharp recess department, and the both ends contact of tile shape sheath forms the arch, and the pressure head is impressed the arch in the sharp recess.
5. The method of manufacturing a permanent magnet assembly according to claim 1, wherein: the insulating adhesive is an epoxy resin adhesive.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910038080.2A CN109994308B (en) | 2019-01-16 | 2019-01-16 | Manufacturing method of combined permanent magnet |
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| CN201910038080.2A CN109994308B (en) | 2019-01-16 | 2019-01-16 | Manufacturing method of combined permanent magnet |
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| CN109994308A CN109994308A (en) | 2019-07-09 |
| CN109994308B true CN109994308B (en) | 2021-01-29 |
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| CN113096909A (en) * | 2021-03-30 | 2021-07-09 | 北京工商大学 | Resource-saving high-performance combined rare earth permanent magnet and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1862718A (en) * | 2005-05-09 | 2006-11-15 | 中国科学院电工研究所 | Bipolar permanent magnet |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20010040493A1 (en) * | 1999-12-30 | 2001-11-15 | Bloom Stuart J. | Flexible sheet magnet and method |
| CN203070861U (en) * | 2013-03-13 | 2013-07-17 | 宁波宁港永磁材料有限公司 | Rare earth permanent magnet |
| US20150284883A1 (en) * | 2013-10-09 | 2015-10-08 | Phillip Grotepas | Woven magnetic boards |
| CN204029515U (en) * | 2014-09-15 | 2014-12-17 | 宁波宁港永磁材料有限公司 | Grooved combination permanent magnet |
| US20170092399A1 (en) * | 2015-09-28 | 2017-03-30 | Ford Global Technologies, Llc | Segmented permanent magnets |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1862718A (en) * | 2005-05-09 | 2006-11-15 | 中国科学院电工研究所 | Bipolar permanent magnet |
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