阅读说明：本技术 一种复合磁钢的加工方法 (Processing method of composite magnetic steel ) 是由 严建新 于 2019-09-27 设计创作，主要内容包括：本发明公开了一种复合磁钢的加工方法,包括：按照预设规律将磁钢片组布置在模具中并产生相应的缝隙；将粘结磁性材料填充到所述缝隙内得到复合一体式成型件；在预设温度下对所述复合一体式成型件烘烤固化得到磁钢成品。本发明的加工方法中,通过在缝隙中填充粘结磁性材料得到复合一体式成型件；在预设温度下对所述复合一体式成型件烘烤固化得到磁钢成品。由于本发明中,直接在所有缝隙中进行填充粘结磁性材料,与现有技术中逐层涂覆粘结剂的工艺相比能够显著提高磁钢的加工效率,利于磁钢的批量生产。(The invention discloses a processing method of composite magnetic steel, which comprises the following steps: arranging the magnetic steel sheet group in a die according to a preset rule and generating a corresponding gap; filling a bonding magnetic material into the gap to obtain a composite integrated forming piece; and baking and curing the composite integrated formed part at a preset temperature to obtain a finished magnetic steel product. In the processing method, the composite integrated forming piece is obtained by filling the bonding magnetic material in the gap; and baking and curing the composite integrated formed part at a preset temperature to obtain a finished magnetic steel product. Because the magnetic material is directly filled and bonded in all gaps, compared with the process of coating the bonding agent layer by layer in the prior art, the process can obviously improve the processing efficiency of the magnetic steel and is beneficial to the batch production of the magnetic steel.)

1. A processing method of composite magnetic steel is characterized by comprising the following steps:

arranging the magnetic steel sheet group in a die according to a preset rule and generating a corresponding gap;

filling a bonding magnetic material into the gap to obtain a composite integrated forming piece;

and baking and curing the composite integrated formed part at a preset temperature to obtain a finished magnetic steel product.

2. The method for processing composite magnetic steel according to claim 1, wherein the predetermined rule includes: the interval between the adjacent magnetic steel sheet groups is 0.5mm-3 mm; or

The gap is arranged between the magnetic steel sheet group positioned at the outermost side and the die; or

The magnetic steel sheet group positioned at the outermost side is tightly attached to the die.

3. The method of claim 1, wherein said magnetic steel sheet assembly comprises one or more magnetic steel sheets, and when said magnetic steel sheet assembly comprises a plurality of magnetic steel sheets, a plurality of said magnetic steel sheets are bonded to form an integral magnetic steel sheet assembly.

4. The method of claim 3, wherein the magnetic steel sheet is a sintered NdFeB magnetic steel sheet, and the density of the sintered NdFeB magnetic steel sheet ranges from 7.55 to 7.65g/cm³。

5. The method of claim 4, wherein before arranging the set of magnetic steel sheets in the mold according to the predetermined rule and generating the corresponding gap, the method further comprises: sintering, grinding the surface and cleaning the sintered Nd-Fe-B magnetic material to obtain a blank material;

bonding the blank material, and performing multi-line cutting to obtain a sintered neodymium iron boron magnetic steel sheet;

cleaning the sintered neodymium-iron-boron magnetic steel sheet;

and preparing a bonded magnetic material powder mixture containing a bonding agent, a coupling agent and aromatic nylon.

6. The method for processing composite magnetic steel according to claim 5, wherein the step of filling the gap with the bonded magnetic material to obtain the composite integrally formed part is as follows:

pressing the bonded magnetic material into the gap by adopting a compression molding process to obtain a composite integrated molding piece; or

Injecting the bonding magnetic material into the gap by adopting an injection molding process to obtain a composite integrated molding piece; or

And extruding the bonded magnetic material into the gap by adopting an extrusion forming process to obtain the composite integrated forming piece.

7. The method of claim 6, wherein said pressing the bonded magnetic material into the gap by a compression molding process to obtain a composite integrally formed part comprises:

putting the bonded magnetic material powder mixture into a powder feeding box, and feeding the bonded magnetic material powder mixture into a gap between sintered neodymium iron boron magnetic steel sheets by adopting an equal-product method or a quantitative powder feeding mode;

and obtaining the composite integrated formed part by adopting a hot pressing mode or a cold pressing mode.

8. The method for processing composite magnetic steel according to claim 7, wherein the hot pressing process parameters are as follows: the hot pressing pressure is controlled to be 4T-5T/cm²The temperature of the mould is between 120 and 180 ℃, and the pressing and pressure maintaining time is controlled between 120 and 180 seconds;

the cold pressing mode comprises the following technological parameters: the cold pressing pressure is controlled between 10T and 12T/cm²The cold pressing temperature is room temperature, and the pressing dwell time is controlled between 5 and 15 seconds.

9. The method for processing magnetic steel according to claim 6, wherein the step of injecting the bonded magnetic material into the gap by using an injection molding process to obtain a composite integrally molded part comprises:

and putting the bonded magnetic material powder mixture into an injection molding machine, and performing injection molding on the bonded magnetic material powder mixture through the injection molding machine to obtain a composite integrated forming piece.

10. The method for processing magnetic steel according to claim 6, wherein the extruding the bonded magnetic material into the gap by using an extrusion molding process to obtain a composite integrally molded part comprises:

putting the bonded magnetic material powder mixture into a powder feeding box, and heating the powder feeding box to melt the bonding agent of the bonded magnetic material powder mixture;

and extruding the bonded magnetic material powder mixture into the gap under the extrusion action of the screw or the plunger to obtain the composite integrated formed part.

11. The method for processing composite magnetic steel according to claim 1, wherein baking and curing the composite integrally formed part at a predetermined temperature to obtain a finished magnetic steel further comprises: and carrying out surface rust prevention, insulating coating treatment, magnetizing and packaging on the baked and cured composite integrated formed part to obtain the finished magnetic steel product.

12. A method of processing composite magnetic steel according to any one of claims 1 to 11, wherein said bonded magnetic material is bonded ndfeb, and the density of the cured bonded ndfeb ranges from 5.8 to 6.2g/cm³。

13. A method for machining composite magnetic steel according to any one of claims 1 to 11, wherein said preset temperature is: 120-200 ℃.

Technical Field

The invention relates to the technical field of magnetic steel processing, in particular to a processing method of composite magnetic steel.

Background

Because the sintered permanent magnet neodymium iron boron magnetic steel is one of the strongest magnetic permanent magnet materials so far, the sintered neodymium iron boron is widely applied to the processing of the magnetic steel of the motor running at high speed. The existing magnetic steel in the field of high-speed running motors adopts sintered neodymium iron boron magnetic steel sheets to be subjected to processes of machining, cleaning, acid washing and the like, then a binder, glue or a mixture of epoxy resin and glass beads is coated on the surface of the magnetic steel, then adjacent sintered neodymium iron boron magnetic steel sheets are bonded together in a superposition or splicing mode, and the sintered neodymium iron boron magnetic steel sheets are baked when the required size is reached. According to the processing method, each sintered neodymium iron boron magnetic steel sheet needs to be coated with the adhesive glue or the mixture of the epoxy resin glue and the glass beads, so that the processing efficiency is low, and the mass production is not facilitated. In addition, a plurality of holes are generated in the bonding gap, the consistency of the bonding gap cannot be ensured after curing and baking, and the insulation and appearance of the product cannot achieve ideal effects.

Therefore, how to improve the processing efficiency of the magnetic steel to adapt to mass production is a problem to be solved urgently by those skilled in the art.

Disclosure of Invention

In view of this, the technical problem to be solved by the present invention is how to improve the processing efficiency of magnetic steel to adapt to mass production, and therefore, the present invention provides a processing method of composite magnetic steel.

In order to achieve the purpose, the invention provides the following technical scheme:

a processing method of composite magnetic steel comprises the following steps:

arranging the magnetic steel sheet group in a die according to a preset rule and generating a corresponding gap;

filling a bonding magnetic material into the gap to obtain a composite integrated forming piece;

and baking and curing the composite integrated formed part at a preset temperature to obtain a finished magnetic steel product.

In one embodiment of the present invention, the preset rule includes: the interval between the adjacent magnetic steel sheet groups is 0.5mm-3 mm; or

The gap is arranged between the magnetic steel sheet group positioned at the outermost side and the die; or

The magnetic steel sheet group positioned at the outermost side is tightly attached to the die.

In one embodiment of the invention, the magnetic steel sheet group comprises one magnetic steel sheet or a plurality of magnetic steel sheets, and when the magnetic steel sheet group comprises a plurality of magnetic steel sheets, the plurality of magnetic steel sheets form the magnetic steel sheet group with an integrated structure through bonding.

In one embodiment of the invention, the magnetic steel sheet is a sintered NdFeB magnetic steel sheet, and the density range of the sintered NdFeB magnetic steel sheet is 7.55-7.65 g/cm³。

In one embodiment of the present invention, before the arranging the magnetic steel sheet groups in the mold according to the preset rule and generating the corresponding gaps, the method further includes: sintering, grinding the surface and cleaning the sintered Nd-Fe-B magnetic material to obtain a blank material;

bonding the blank material, and performing multi-line cutting to obtain a sintered neodymium iron boron magnetic steel sheet;

cleaning the sintered neodymium-iron-boron magnetic steel sheet;

and preparing a bonded magnetic material powder mixture containing a bonding agent, a coupling agent and aromatic nylon.

In one embodiment of the present invention, the filling of the bonded magnetic material into the gap to obtain the composite integrally formed part is:

pressing the bonded magnetic material into the gap by adopting a compression molding process to obtain a composite integrated molding piece; or

Injecting the bonding magnetic material into the gap by adopting an injection molding process to obtain a composite integrated molding piece; or

And extruding the bonded magnetic material into the gap by adopting an extrusion forming process to obtain the composite integrated forming piece.

In one embodiment of the present invention, the pressing the bonded magnetic material into the gap by using a compression molding process to obtain the composite integrally molded part includes:

putting the bonded magnetic material powder mixture into a powder feeding box, and feeding the bonded magnetic material powder mixture into a gap between sintered neodymium iron boron magnetic steel sheets by adopting an equal-product method or a quantitative powder feeding mode;

and obtaining the composite integrated formed part by adopting a hot pressing mode or a cold pressing mode.

In one embodiment of the present invention, the hot pressing process parameters are: the hot pressing pressure is controlled to be 4T-5T/cm²The temperature of the mould is between 120 and 180 ℃, and the pressing and pressure maintaining time is controlled between 120 and 180 seconds;

the cold pressing mode comprises the following technological parameters: the cold pressing pressure is controlled between 10T and 12T/cm²The cold pressing temperature is room temperature, and the pressing dwell time is controlled between 5 and 15 seconds.

In one embodiment of the present invention, the injecting the bonded magnetic material into the gap by using an injection molding process to obtain a composite integrally molded part includes:

and putting the bonded magnetic material powder mixture into an injection molding machine, and performing injection molding on the bonded magnetic material powder mixture through the injection molding machine to obtain a composite integrated forming piece.

In one embodiment of the present invention, the extruding the bonded magnetic material into the gap by using an extrusion molding process to obtain a composite integrally molded part includes:

putting the bonded magnetic material powder mixture into a powder feeding box, and heating the powder feeding box to melt the bonding agent of the bonded magnetic material powder mixture;

and extruding the bonded magnetic material powder mixture into the gap under the extrusion action of the screw or the plunger to obtain the composite integrated formed part.

In one embodiment of the present invention, baking and curing the composite integrally formed part at a preset temperature to obtain a finished magnetic steel product further includes: and carrying out surface rust prevention, insulating coating treatment, magnetizing and packaging on the baked and cured composite integrated formed part to obtain the finished magnetic steel product.

In one embodiment of the present invention, the bonded magnetic material is bonded neodymium iron boron, and the density of the cured bonded neodymium iron boron is in the range of 5.8-6.2g/cm³。

In one embodiment of the present invention, the preset temperature is: 120-200 ℃.

According to the technical scheme, in the processing method of the composite magnetic steel, the composite integrated forming piece is obtained by filling the bonding magnetic material in the gap; and baking and curing the composite integrated formed part at a preset temperature to obtain a finished magnetic steel product. Because the magnetic material is directly filled and bonded in all gaps, compared with the process of coating the bonding agent layer by layer in the prior art, the process can obviously improve the processing efficiency of the magnetic steel and is beneficial to the batch production of the magnetic steel.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic flow chart of a processing method of composite magnetic steel provided by the invention;

FIG. 2a is a schematic top view of a magnetic steel sheet set disposed in a mold according to a first embodiment of the present invention;

FIG. 2b is a schematic bottom view of the first embodiment of the present invention after filling the magnetic material;

FIG. 2c is a schematic top view of the first embodiment of the present invention after filling the bonding magnetic material;

FIG. 2d is a schematic top view illustrating the first embodiment of the present invention after the mold is removed;

FIG. 3a is a schematic top view of a magnetic steel sheet set disposed in a mold according to a second embodiment of the present invention;

FIG. 3b is a schematic bottom view of a second embodiment of the present invention after filling with bonded magnetic material;

FIG. 3c is a schematic top view of a second embodiment of the present invention after filling with the bonded magnetic material;

FIG. 3d is a schematic top view illustrating a second embodiment of the present invention after the mold is removed;

FIG. 4a is a schematic top view of a magnetic steel sheet set disposed in a mold according to a third embodiment of the present invention;

FIG. 4b is a schematic bottom view of the third embodiment of the present invention after filling the bonded magnetic material;

FIG. 4c is a schematic top view of a third embodiment of the present invention after filling the bonding magnetic material;

FIG. 4d is a schematic top view illustrating a third embodiment of the present invention after removing the mold;

FIG. 5a is a schematic top view of a magnetic steel sheet set disposed in a mold according to a fourth embodiment of the present invention;

FIG. 5b is a schematic bottom view of a fourth embodiment of the present invention after filling with bonded magnetic material;

FIG. 5c is a schematic top view of a fourth embodiment of the present invention after filling with the bonded magnetic material;

FIG. 5d is a schematic top view illustrating a fourth embodiment of the present invention after the mold is removed;

FIG. 6a is a schematic top view of a magnetic steel sheet assembly disposed in a mold according to a fifth embodiment of the present invention;

FIG. 6b is a schematic bottom view of a fifth embodiment of the present invention after filling with bonded magnetic material;

FIG. 6c is a schematic top view of a fifth embodiment of the present invention after filling with the bonded magnetic material;

FIG. 6d is a schematic top view illustrating a fifth embodiment of the present invention, after the mold is removed;

FIG. 7a is a schematic top view of a magnetic steel sheet assembly disposed in a mold according to a sixth embodiment of the present invention;

FIG. 7b is a schematic bottom view of a sixth embodiment of the present invention after filling with bonded magnetic material;

FIG. 7c is a schematic top view of a sixth embodiment of the present invention after filling with the bonded magnetic material;

FIG. 7d is a schematic top view illustrating a sixth embodiment of the present invention after the mold is removed;

FIG. 8a is a schematic top view of a magnetic steel sheet assembly disposed in a mold according to a seventh embodiment of the present invention;

FIG. 8b is a schematic bottom view of a seventh embodiment of the present invention after filling with bonded magnetic material;

FIG. 8c is a schematic top view of a seventh embodiment of the present invention after filling with the bonded magnetic material;

FIG. 8d is a schematic top view illustrating a seventh embodiment of the present invention after removing the mold;

FIG. 9a is a schematic top view of a magnetic steel sheet assembly disposed in a mold according to an eighth embodiment of the present invention;

FIG. 9b is a schematic bottom view of the magnetic material filled with the bonded magnetic material according to the eighth embodiment of the present invention;

FIG. 9c is a schematic top view of a bonded magnetic material according to an eighth embodiment of the present invention;

fig. 9d is a schematic top view of the eighth embodiment of the present invention with the mold removed.

In the figure, 100 is a die, 101 is a slit, 200 is a magnetic steel sheet group, and 300 is a bonded magnetic material.

Detailed Description

The core of the invention is to provide a processing method of composite magnetic steel, so as to improve the processing efficiency of the magnetic steel and adapt to batch production.

The embodiments described below do not limit the contents of the invention described in the claims. The entire contents of the configurations shown in the following embodiments are not limited to those required as solutions of the inventions described in the claims.

Referring to fig. 1, a method for processing a composite magnetic steel according to an embodiment of the present invention includes:

step S1: and arranging the magnetic steel sheet group in the die according to a preset rule and generating a corresponding gap.

The preset rule is adjusted according to design requirements, and parameters related to the preset rule comprise the interval between the magnetic steel sheet groups, the size of the magnetic steel sheet groups, the structure of the magnetic steel sheet groups, whether the gap exists between the magnetic steel sheet groups and a die, and the like. Or the preset rule comprises: the interval between the adjacent magnetic steel sheet groups is 0.5mm-3 mm; or the gap is arranged between the magnetic steel sheet group positioned at the outermost side and the die; or the magnetic steel sheet group positioned at the outermost side is tightly attached to the die.

Referring to fig. 2a, each magnetic steel sheet group 200 includes a magnetic steel sheet, adjacent magnetic steel sheets are arranged at a predetermined distance, and a gap 101 is formed between the outermost magnetic steel sheet and the mold 100.

Referring to fig. 3a, each magnetic steel sheet group 200 includes a magnetic steel sheet, adjacent magnetic steel sheets are arranged at a predetermined distance, and the magnetic steel sheet located at the outermost side is seamlessly attached to the mold 100.

Referring to fig. 4a, each magnetic steel sheet group 200 includes a magnetic steel sheet, adjacent magnetic steel sheets are arranged at a predetermined distance, a gap 101 exists between the magnetic steel sheet located on the outermost side of the left side and the mold 100, and the magnetic steel sheet located on the outermost side of the right side and the mold 100 are seamlessly attached to each other.

Referring to fig. 5a, each magnetic steel sheet group 200 includes a magnetic steel sheet, adjacent magnetic steel sheets are arranged at a predetermined distance, the magnetic steel sheet located on the outermost side of the left side is seamlessly attached to the mold 100, and a gap 101 exists between the magnetic steel sheet located on the outermost side of the right side and the mold 100.

Referring to fig. 6a, each magnetic steel sheet group 200 includes two magnetic steel sheets, adjacent magnetic steel sheet groups 200 are arranged at a predetermined distance, and a gap 101 is formed between the outermost magnetic steel sheet and the mold 100.

Referring to fig. 7a, each magnetic steel sheet group 200 includes two magnetic steel sheets, and adjacent magnetic steel sheet groups 200 are arranged at a predetermined distance, and the magnetic steel sheet located at the outermost side is seamlessly attached to the mold 100.

Referring to fig. 8a, each magnetic steel sheet group 200 includes two magnetic steel sheets, adjacent magnetic steel sheet groups 200 are arranged at a predetermined distance, a gap 101 exists between the magnetic steel sheet located on the outermost side of the left side and the mold 100, and the magnetic steel sheet located on the outermost side of the right side and the mold 100 are seamlessly attached to each other.

Referring to fig. 9a, each magnetic steel sheet group 200 includes two magnetic steel sheets, adjacent magnetic steel sheet groups 200 are arranged at a predetermined distance, the magnetic steel sheet on the outermost side of the left side is seamlessly attached to the mold 100, and a gap 101 exists between the magnetic steel sheet on the outermost side of the right side and the mold 100.

The magnetic steel sheet set comprises one or more magnetic steel sheets, and when the magnetic steel sheet set comprises a plurality of magnetic steel sheets, the plurality of magnetic steel sheets are bonded to form the magnetic steel sheet set with an integrated structure. The above embodiment has been described briefly in the case that the magnetic steel sheet group includes one and two magnetic steel sheets, but each magnetic steel sheet group in the present invention may also include three, four, and five magnetic steel sheets, which are merely used for illustration and are not limited.

The magnetic steel sheet is made of magnetic material such as sintered Nd-Fe-B magnetic steel sheet, ferrite magnetic steel sheet, etc., and sintered Nd-Fe-B magnetic steel sheet is preferably used in the present invention.

In order to make the adhesion between the magnetic steel sheet group and the adhesive magnetic material stronger, the method also comprises cleaning the surface of the magnetic steel sheet group before the step.

Step S2: and filling the bonding magnetic material into the gap to obtain the composite integrated forming piece.

In this step, the gaps are filled with the bonded magnetic material to obtain a composite integrally molded article, wherein the filling method is various, and as can be seen from the above step S1, the interval between the adjacent magnetic steel sheet groups is 0.5mm to 3 mm. Therefore, in the invention, one of the following processes is selected to fill and bond the magnetic material: pressing the bonded magnetic material into the gap by adopting a compression molding process to obtain a composite integrated molding piece; injecting the bonding magnetic material into the gap by adopting an injection molding process to obtain a composite integrated molding piece; and extruding the bonded magnetic material into the gap by adopting an extrusion forming process to obtain the composite integrated forming piece.

Adopting the compression molding process to press the bonded magnetic material into the gap to obtain the composite integrated formed part comprises the following steps: putting the bonded magnetic material powder mixture into a powder feeding box, and feeding the bonded magnetic material powder mixture into a gap between sintered neodymium iron boron magnetic steel sheets by adopting an equal-product method or a quantitative powder feeding mode; and obtaining the composite integrated formed part by adopting a hot pressing mode or a cold pressing mode.

Wherein, the hot pressing process parameters are as follows: the hot pressing pressure is controlled to be 4T-5T/cm²The temperature of the mould is between 120 and 180 ℃, and the pressing and pressure maintaining time is controlled between 120 and 180 seconds; the technological parameters of the cold pressing mode are as follows: the cold pressing pressure is controlled between 10T and 12T/cm²The cold pressing temperature is room temperature, and the pressing dwell time is controlled between 5 and 15 seconds.

The injection molding process is adopted to inject the bonding magnetic material into the gap to obtain the composite integrated forming piece, and the composite integrated forming piece comprises the following steps: and (3) putting the bonded magnetic material powder mixture into an injection molding machine, and injecting the bonded magnetic material powder mixture into a gap through the injection molding machine to obtain a composite integrated formed part.

The method for extruding the bonded magnetic material into the gap by adopting an extrusion forming process to obtain the composite integrated forming piece comprises the following steps: putting the bonded magnetic material powder mixture into a powder feeding box, and heating the powder feeding box to melt the bonding agent of the bonded magnetic material powder mixture; and extruding the bonded magnetic material powder mixture into the gap under the extrusion action of the screw or the plunger to obtain the composite integrated formed part.

The bonded magnetic material is a structure formed by mixing a viscous substance and magnetic powder, and has the characteristics of cohesiveness and magnetizability. The bonded magnetic material in the invention is preferably bonded neodymium iron boron, so that the method further comprises the following steps before the step: the bonded magnetic material is configured. When the bonded magnetic material is bonded neodymium iron boron, the specific configuration process is as follows: mixing rare earth materials such as praseodymium, neodymium and the like with substances such as iron, boron and the like by a certain formula by a rapid quenching method, and then uniformly mixing the mixed powder with glue, a binder and granulation.

In order to improve the density of the bonded magnetic material between the adjacent magnetic steel sheet groups after molding, the method further comprises the following steps: compacting the bonded magnetic material in the gap.

Please refer to fig. 2b, 3b, 4b, 5b, 6b, 7b, 8b, 9b, 2c, 3c, 4c, 5c, 6c, 7c, 8c and 9c, wherein 2b, 3b, 4b, 5b, 6b, 7b, 8b and 9b are bottom views of the gap-filled bonded magnetic material 300, and 2c, 3c, 4c, 5c, 6c, 7c, 8c and 9c are top views of the gap-filled bonded magnetic material 300. After molding, the composite one-piece molded part is removed from the mold 100, see fig. 2d, 3d, 4d, 5d, 6d, 7d, 8d and 9 d.

Step S3: and baking and curing the composite integrated formed part at a preset temperature to obtain a finished magnetic steel product.

The preset temperature is 120-200 ℃, and the step also comprises the steps of performing surface rust prevention, insulating coating treatment, magnetizing and packaging on the baked and cured composite integrated formed part to obtain the finished magnetic steel product.

The density range of the sintered Nd-Fe-B magnetic steel sheet is 7.55-7.65 g/cm³The density range of the solidified bonded neodymium iron boron is 5.8-6.2g/cm³。

In the processing method of the composite magnetic steel, the composite integrated forming piece is obtained by filling the bonding magnetic material in the gap; and baking and curing the composite integrated formed part at a preset temperature to obtain a finished magnetic steel product. Because the magnetic material is directly filled and bonded in all gaps, compared with the process of coating the bonding agent layer by layer in the prior art, the process can obviously improve the processing efficiency of the magnetic steel and is beneficial to the batch production of the magnetic steel.

Take the magnetic steel sheet to adopt sintering neodymium iron boron magnetic steel sheet, the magnetic material that bonds adopts bonding neodymium iron boron as the example: the sintered neodymium iron boron is mainly made of various metal materials, and the internal conductivity of the sintered neodymium iron boron is very good through high-temperature sintering, and the resistivity is 1.4-1.6 mu omega. The bonded neodymium iron boron product is formed by granulating neodymium iron boron powder and glue, the resistivity is 30-150 mu omega, and the resistivity is 20-100 times of that of sintered neodymium iron boron.

The technique of combining all the advantages of the bonded neodymium iron boron and the sintered neodymium iron boron is used, so that the eddy current of the motor is reduced, the heating of the motor is reduced, and the motor efficiency is improved.

In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.