阅读说明：本技术 一种电机磁芯的制备方法和电机磁芯 (Preparation method of motor magnetic core and motor magnetic core ) 是由 江志滨 张世明 高旭升 于 2018-07-10 设计创作，主要内容包括：本发明公开了一种电机磁芯的制备方法,包括预先获得按照预定切割尺寸进行切割的多片非晶带材,其中,每片非晶带材的预定切割尺寸不完全相同；将各片非晶带材按照预定顺序依次堆叠；将堆叠后的非晶带材进行热处理；将进行热处理后的多片非晶带材进行固化,获得立体的具有非柱状侧面的电机磁芯。本发明所提供的制备方法所获得的电机磁芯,具有更复杂的外部轮廓形状,能够更加充分的利用空间,扩大了电机磁芯的应用场景。本发明中还提供了一种电机磁芯,具有上述有益效果。(The invention discloses a preparation method of a motor magnetic core, which comprises the steps of obtaining a plurality of amorphous strips which are cut according to a preset cutting size in advance, wherein the preset cutting size of each amorphous strip is not completely the same; stacking the amorphous strips in sequence according to a preset sequence; carrying out heat treatment on the stacked amorphous strips; and curing the plurality of amorphous strips subjected to heat treatment to obtain the three-dimensional motor magnetic core with the non-columnar side surface. The motor magnetic core obtained by the preparation method provided by the invention has a more complex external outline shape, can more fully utilize the space, and expands the application scene of the motor magnetic core. The invention also provides a motor magnetic core which has the beneficial effects.)

1. A method for preparing a motor magnetic core is characterized by comprising the following steps:

obtaining a plurality of amorphous strips cut according to a preset cutting size in advance, wherein the preset cutting size of each amorphous strip is not completely the same;

stacking the amorphous strips in sequence according to a preset sequence;

carrying out heat treatment on the stacked amorphous strip;

and curing the plurality of amorphous strips subjected to heat treatment to obtain the three-dimensional motor magnetic core with the non-columnar side surface.

2. The method according to claim 1, wherein the pre-obtaining of the plurality of amorphous strips cut according to the predetermined cut size comprises:

and respectively cutting the amorphous strip raw material sheets into single sheets according to the corresponding preset cutting sizes to obtain a plurality of amorphous strips.

3. The method according to claim 2, wherein the individually cutting the amorphous strip material sheet according to the predetermined cutting sizes respectively comprises:

cutting the amorphous strip raw material sheet into single pieces by pulse laser, wherein the pulse width of the pulse laser is not more than 10^-9And s, the laser wavelength is 1030nm, the laser spot diameter is less than 20 mu m, and the laser power is less than 5W.

4. The method according to claim 2, wherein the individually cutting the amorphous strip material sheet according to the predetermined cutting sizes respectively comprises:

and carrying out single-piece cutting on the amorphous strip raw material sheet through water cutting.

5. The method according to claim 1, wherein the pre-obtaining of the plurality of amorphous strips cut according to the predetermined cut size comprises:

stacking a plurality of amorphous strip raw material sheets to obtain a plurality of amorphous strip lamination sets;

cutting each group of amorphous strip stacking piece groups according to the preset cutting size corresponding to each group, wherein the preset cutting sizes corresponding to the amorphous strip stacking piece groups are not identical;

and taking an amorphous strip from each group of the amorphous strip lamination groups after cutting to obtain the amorphous strips cut according to the preset cutting size.

6. The method according to claim 5, wherein the step of cutting each group of the stacked amorphous strip groups according to the preset cutting size corresponding to each group comprises the following steps:

and cutting the Ferro-amorphous strip lamination set by any one of laser cutting, water cutting or linear cutting.

7. The production method according to any one of claims 1 to 6, wherein the side surface of the motor core is a stepped surface or an arc surface.

8. The method according to claim 7, wherein the heat-treating the stacked amorphous ribbon comprises:

and carrying out magnetic field heat treatment on the amorphous strip.

9. A motor core, characterized in that the motor core is obtained by the manufacturing method of any one of claims 1 to 8.

10. The motor core according to claim 9, wherein the side surface of the motor core is a stepped surface or a circular arc surface.

Technical Field

The invention relates to the technical field of motor preparation, in particular to a preparation method of a motor magnetic core and the motor magnetic core.

Background

Most of the existing motor magnetic cores use silicon steel sheets as magnetic core materials. However, when the frequency of the motor is increased, the loss of the magnetic core is increased sharply, and the waste of electric energy is great. Amorphous strip has lower losses than silicon steel sheet due to material composition characteristics and thinner thickness of the strip. Therefore, the amorphous strip is used as the magnetic core of the motor, so that the motor has lower loss, better efficiency and more energy saving.

At present, the inner side and the outer side of the motor magnetic core prepared from the amorphous strip are all straight column sides, so that the motor magnetic core is limited in installation and use.

Disclosure of Invention

The invention aims to provide a preparation method of a motor magnetic core and the motor magnetic core, and solves the problem that the motor magnetic core is limited in installation and use.

In order to solve the technical problem, the invention provides a method for preparing a magnetic core of a motor, which comprises the following steps:

obtaining a plurality of amorphous strips cut according to a preset cutting size in advance, wherein the preset cutting size of each amorphous strip is not completely the same;

stacking the amorphous strips in sequence according to a preset sequence;

carrying out heat treatment on the stacked amorphous strip;

and curing the plurality of amorphous strips subjected to heat treatment to obtain the three-dimensional motor magnetic core with the non-columnar side surface.

Wherein the obtaining in advance a plurality of amorphous ribbons cut according to a predetermined cut size comprises:

and respectively cutting the amorphous strip raw material sheets into single sheets according to the corresponding preset cutting sizes to obtain a plurality of amorphous strips.

Wherein the step of respectively cutting the amorphous strips into single pieces according to the respective predetermined cutting sizes comprises:

the amorphous strip is cut into single pieces by a pulse laser, wherein the pulse width of the pulse laser is not more than 10^-9And s, the laser wavelength is 1030nm, the laser spot diameter is less than 20 mu m, and the laser power is less than 5W.

Wherein, the step of respectively cutting the amorphous strip material sheet into single pieces according to the respective corresponding preset cutting sizes comprises the following steps:

and carrying out single-chip cutting on the amorphous strip by water cutting.

Wherein the obtaining in advance of the plurality of amorphous strips cut according to the predetermined cutting size comprises:

stacking a plurality of amorphous strips to obtain a plurality of amorphous strip lamination sets;

cutting each group of amorphous strip stacking piece groups according to the preset cutting size corresponding to each group, wherein the preset cutting sizes corresponding to the amorphous strip stacking piece groups are not identical;

and taking an amorphous strip from each group of the amorphous strip lamination groups after cutting to obtain the amorphous strips cut according to the preset cutting size.

Wherein, the cutting each group of the amorphous strip stacking piece groups according to the preset cutting size corresponding to each group respectively comprises the following steps:

and cutting the Ferro-amorphous strip lamination set by any one of laser cutting, water cutting or linear cutting.

The side surface of the motor magnetic core is a step surface or an arc surface.

Wherein the heat treating the plurality of individual amorphous ribbons comprises:

and carrying out magnetic field heat treatment on the amorphous strip.

The invention also provides a motor magnetic core, which is obtained by adopting any one of the preparation methods.

The side surface of the motor magnetic core is a step surface or an arc surface.

According to the preparation method for preparing the motor magnetic core, the amorphous strips obtained by cutting according to the respective cutting sizes are adopted, the cutting sizes of the amorphous strips are not completely the same, so that after the amorphous strip pieces are stacked, the edges of the amorphous strip pieces are not in the same vertical plane, and finally the motor magnetic core with the non-straight column side face can be obtained. And therefore, the external outline of the motor magnetic core can be set according to the needs, for example, a curved surface structure, a step structure or a more complex 3D-shaped magnetic core can be manufactured, the specific space or structure of a user can be fully utilized, the design of the motor magnetic core is most economical, the performance of the magnetic core is exerted to the maximum extent, and the motor magnetic core is matched with the size space used by equipment. Therefore, the motor magnetic core obtained by the preparation method provided by the invention has a more complex external outline shape, can more fully utilize the space, and expands the application scene of the motor magnetic core.

The invention also provides a motor magnetic core which has the beneficial effects.

Drawings

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

Fig. 1 is a schematic flow chart of a method for manufacturing a magnetic core of an electric machine according to an embodiment of the present invention;

FIG. 2 is a schematic view of a stator of a prior art electric machine;

fig. 3 is a schematic structural diagram of a motor stator according to an embodiment of the present invention

Fig. 4 is a schematic structural diagram of a rotor of an electric machine according to an embodiment of the present invention;

fig. 5 is a schematic flow chart of cutting an amorphous ribbon according to an embodiment of the present invention.

Detailed Description

The amorphous strip is widely applied to distribution transformers, high-frequency electric energy conversion (such as PFC inductance) energy storage inductors and the like as a magnetic core due to the excellent magnetic performance of the amorphous strip. The amorphous magnetic core has the advantages of lower loss and more excellent frequency characteristic compared with a silicon steel sheet; compared with ferrite, the ferrite has a higher Bs value, and can achieve smaller product size.

The existing method for processing amorphous strips to obtain motor magnetic cores is generally that the strips are subjected to heat treatment, lamination, bonding and curing, and then wire cutting processing is used. The side faces of the component obtained by machining in this way can only be cylindrical side faces, for example cylindrical side faces and the vertical plane of a cube. So that the profile shape of the outer surface of the component is limited to a large extent.

According to the motor magnetic core with the non-cylindrical side surface, the pre-cut single amorphous strips are overlapped, the cutting size of each amorphous strip is not completely the same, the shape and the external profile of the overlapped motor magnetic core are further controlled, the motor magnetic core with the non-cylindrical side surface is obtained, the space of the motor can be reasonably utilized to a greater extent, and the motor magnetic core has better service performance.

In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1, fig. 1 is a schematic flow chart of a method for manufacturing a magnetic core of an electric machine according to an embodiment of the present invention, where the method includes:

step S1: and cutting the amorphous strip raw material sheet according to a preset cutting size in advance to obtain the amorphous strips with different cutting sizes.

Step S2: and sequentially stacking the amorphous strips according to a preset sequence.

Step S3: and carrying out heat treatment on the stacked amorphous strips.

Step S4: and curing the plurality of amorphous strips subjected to heat treatment to obtain the three-dimensional motor magnetic core with the non-columnar side surface.

In the present embodiment, the amorphous strips with the required size are obtained by cutting, and then the amorphous strips are stacked and then heat-treated. Different from the prior art in which heat treatment is performed first, and then amorphous strip pieces are stacked and cured, and then cut.

Considering that the brittleness of the amorphous strip is enhanced after the heat treatment, and great difficulty is brought to the subsequent lamination and cutting processes, the heat treatment is carried out after the cutting and lamination are carried out, so that the influence on the cutting and lamination caused by the brittleness of the amorphous strip can be avoided to a great extent; in addition, the curing in the invention is completed after the heat treatment, so that the phenomenon that the performance of the glue used for curing is influenced by heating in the heat treatment process can be avoided.

Of course, the heat treatment in the present invention may be performed before lamination or cutting, that is, after heat treatment and cutting, lamination is performed, or after cutting and heat treatment, lamination is performed, which does not affect the implementation of the technical solution of the present invention, as long as the motor core with non-cylindrical surface can be finally obtained.

Optionally, the surface of the motor magnetic core finally obtained in this embodiment may be a stepped surface, an arc surface, or a surface of any other shape, and only the size of each amorphous strip needs to be set according to actual conditions.

As shown in fig. 2, fig. 3 and fig. 4, fig. 2 is a schematic structural diagram of a motor stator in the prior art, fig. 3 is a schematic structural diagram of a motor stator provided in an embodiment of the present invention, and fig. 4 is a schematic structural diagram of a motor rotor provided in an embodiment of the present invention. As can be seen from comparison between fig. 2, fig. 3 and fig. 4, the outer surfaces of the motor rotor and the motor stator in the present invention are curved structures, while the motor stator in fig. 2 is a surface having a straight cylindrical structure, regardless of the inner surface or the outer surface. This is relevant to the prior art method of manufacturing motor stators using amorphous ribbon. In the prior art, after a plurality of amorphous strip laminations are solidified, the amorphous strips are cut downwards in a manner of linear cutting and the like, the surface of each amorphous strip is perpendicular to the surface of each amorphous strip, and after the amorphous strips are cut in the manner, the cutting size of each amorphous strip is completely the same, and finally, only a motor stator with a straight column outer side surface can be obtained.

When the motor magnetic core is prepared, the cutting sizes of the amorphous strips are not completely the same, so that the width sizes of the amorphous strips which are mutually attached are gradually increased or decreased, and the finally obtained outer contour shape of the motor magnetic core is more variable.

For example, if the magnetic core of the motor needs to be made into a cylindrical step-shaped structure, two cylindrical structures with different diameters need to be prepared first in the prior art, and then the two cylindrical structures are overlapped and bonded; but the invention can be directly integrated into one piece to directly produce the cylindrical motor magnetic core with a step-shaped structure.

Therefore, the motor magnetic core with the non-columnar side surface can be finally obtained by adopting the amorphous strips which are respectively cut according to the respective sizes to carry out lamination, heat treatment and solidification. Compared with the prior art, the external outline of the motor magnetic core can be set arbitrarily according to the actual use space requirement, for example, a curved surface structure, a stepped structure or a more complex 3D-shaped magnetic core can be manufactured, and the specific space or structure of a user can be fully utilized, so that the design of the motor magnetic core is most economical, the performance of the magnetic core is exerted to the maximum extent, and the motor magnetic core conforms to the size space of equipment use. Therefore, the motor magnetic core obtained by the preparation method provided by the invention has a more complex external outline shape, can more fully utilize the space, and expands the application scene of the motor magnetic core.

Based on the above embodiments, there are various specific ways to obtain in advance amorphous strips with different preset cutting sizes, and the following description is given by using specific examples.

In an embodiment of the present invention, the step S1 may specifically include:

and respectively cutting the amorphous strip material sheets into single sheets according to the preset cutting sizes.

That is, by cutting a single amorphous ribbon to a respective predetermined size. The cutting mode is independently carried out on each amorphous strip, and has better precision.

Alternatively, for the above embodiments, a pulsed laser may be specifically used to cut a single amorphous ribbon.

It should be noted that, in the pulse laser for cutting a single amorphous strip, the amorphous strip at the etched portion is generally heated by the heat generated by the laser until the amorphous strip at the etched portion is melted, so as to cut the amorphous strip. But amorphous ribbon is a metastable state of a metallic material; when the pulse laser heats the etching area of the amorphous strip, the surrounding part of the amorphous strip generates heat transfer, and therefore heat is obtained. The possibility that the material around the etching area is changed from a metastable state to a stable state after obtaining heat is greatly improved, and finally, the material property of the area around the cut part of the amorphous strip is changed, so that the flatness of the edge area of the whole amorphous strip is poor, and the normal use of the amorphous strip is seriously influenced.

Therefore, the present embodiment may further include: the pulse width of the pulse laser for cutting the amorphous strip is not more than 10^-9And s, the laser wavelength is 1030nm, the laser spot diameter is less than 20 mu m, and the laser power is less than 5W.

The power used by the middle pulse laser in the embodiment is not large, but is similar to the power of the conventional pulse laser. However, in this embodiment, the pulse width is very small and the wavelength of the laser is not large. It should be noted that, according to the principle of the glass duality of the laser particles, when the power is constant, the smaller the wavelength of the light wave is, the larger the kinetic energy of the light wave particles is, and the pulse width of the laser is smaller, so that the energy of the laser can be better concentrated, and finally, the laser particles interacting with the amorphous strip have larger instantaneous kinetic energy, so that the temperature of the cutting area of the amorphous strip can be instantly raised, the material in the cutting area of the amorphous strip is directly sublimated before the heat transfer with the material in the surrounding area, thereby avoiding the denaturation of the material in the surrounding area of the cutting area of the amorphous strip, and further well ensuring the performance and the flatness of the amorphous strip.

Alternatively, there is not only one cutting method for cutting the single amorphous strip, but also water cutting can be adopted.

Of course, other ways of cutting a single amorphous strip can be used in the present invention, which are not listed.

Based on the foregoing embodiment, in the present invention, it is not necessary for a plurality of amorphous strips with different preset cutting sizes to be cut in step S1, and therefore, in another embodiment of the present invention, as shown in fig. 5, fig. 5 is a schematic flow chart of cutting an amorphous strip according to an embodiment of the present invention, and step S1 may specifically include:

step S11: and stacking a plurality of amorphous strip raw material sheets to obtain a plurality of groups of amorphous strip laminated sheet groups.

Step S12: and cutting each group of amorphous strip stacking piece groups according to the preset cutting size corresponding to each group.

Wherein, the preset cutting sizes corresponding to each group of amorphous strip stacking groups are not completely the same.

Step S13: and taking one amorphous strip from each group of amorphous strip lamination groups after cutting to obtain the amorphous strips cut according to the preset cutting size.

The cutting mode of each amorphous strip lamination group in the embodiment is the same as the cutting mode of curing and cutting after a plurality of amorphous strip laminations in the prior art, and the difference is that the amorphous strips sliced simultaneously in the embodiment are used for preparing different motor magnetic cores, while the amorphous strips in the prior art are applied to the same motor magnetic core.

In particular, the number of groups of laminations of amorphous ribbon per group may be the same. Then, by cutting the obtained amorphous strip in this way, a plurality of motor cores with the same size can be prepared at one time. The production efficiency of the motor magnetic core is improved, and the large-scale production of the motor magnetic core is facilitated.

In addition, compared with the method for cutting the amorphous strip by a single piece, the method for cutting the stack of amorphous strip sheets is easier to realize, and the cutting cost is lower.

Optionally, in this embodiment, the amorphous strip lamination stack may be cut by any one of laser cutting, water cutting, and wire cutting, which is not limited in the present invention.

Based on any of the above embodiments, in another specific embodiment of the present invention, as for the heat treatment of the amorphous ribbon in step S3, a magnetic field heat treatment may be specifically adopted, specifically, the amorphous ribbon is subjected to a heat treatment in a magnetic field, which is beneficial to improving the performance of the motor magnetic core.

Specifically, a transverse magnetic field may be used, and a longitudinal magnetic field may be used. The effect on the magnetic field heat treatment can be referred to the following table:

table 1:

as shown in Table 1, the first four groups in Table 1 were heat-treated without applying a magnetic field, and the second four groups were heat-treated with applying a longitudinal magnetic field having a frequency of 50 Hz. The excitation Ss (W/kg), the loss Ps (W/kg) and the coercive force Hm (A/m) measured by the first four groups of samples in the table 1 are all larger than the data measured by the second four groups of samples, so that the loss of the amorphous strip obtained by magnetic field heating is lower. In addition, the permeability Um (mH/m), hysteresis loss and eddy current loss of the first four groups of samples in table 1 are also significantly greater than those of the second four groups. Therefore, the motor magnetic core obtained by heating the magnetic field has better performance.

The invention also provides an embodiment of the motor magnetic core, wherein the motor magnetic core is obtained by adopting the preparation method of any embodiment.

Optionally, the side surface of the motor magnetic core is a step surface, a circular arc surface or any other shape.

The side in this embodiment can set for according to actual need, can improve the utilization ratio in motor installation place space to the at utmost. The special space or structure of the user can be fully utilized, so that the design of the motor magnetic core is most economical, the performance of the magnetic core is exerted to the maximum extent, and the size and the space of the motor magnetic core are matched with the size and the space of equipment.

The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other.

The above details describe a motor magnetic core and a method for manufacturing the same provided by the present invention. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.