CN112564436A - Method of manufacturing a rotor assembly - Google Patents
Method of manufacturing a rotor assembly Download PDFInfo
- Publication number
- CN112564436A CN112564436A CN202011353533.XA CN202011353533A CN112564436A CN 112564436 A CN112564436 A CN 112564436A CN 202011353533 A CN202011353533 A CN 202011353533A CN 112564436 A CN112564436 A CN 112564436A
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- Prior art keywords
- shaft
- magnet
- rotor assembly
- manufacturing
- magnetic steel
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
- H02K15/03—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies having permanent magnets
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Manufacture Of Motors, Generators (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
A method of manufacturing a rotor assembly by providing magnetic powder and a binder, uniformly mixing them; pressing into an uncured magnet by using a mold; providing a shaft required by the fixed magnet, wherein the shaft can be made of high-temperature resistant materials such as metal materials, ceramic materials and the like; dissolving a magnet binder in an organic solvent according to a certain proportion, uniformly stirring, brushing the prepared solution on a corresponding position at the matching position of a shaft and magnetic steel by using a brush to dip the prepared solution, arranging a magnet on the shaft brushed with the glue, and positioning the magnet through a step on the shaft or other parts arranged on the shaft or an external positioning plate; and heating in an oven to make the heated and overflowed adhesive in the inner hole of the magnet combine with the adhesive brushed on the shaft at a certain temperature, so as to fix the magnet on the shaft. The invention can increase the press-off force of the shaft and the magnetic steel, make up the influence of the fit clearance of the shaft and the magnetic steel on the press-off force and limit the selection of the shaft.
Description
Technical Field
The invention belongs to the field of high-speed rotors of motors, and particularly relates to a method for manufacturing a rotor assembly.
Background
The rotor of an electric machine typically includes a rotor core secured to a shaft. The rotor core may include a magnet having a bore through which the shaft is received. Most magnets are brittle and will crack if subjected to excessive tensile stress. Therefore, the magnet is not typically press-fitted to the shaft, but rather bonded to the shaft.
It is now possible to adhere the magnet to the shaft by applying a layer of adhesive to the shaft and then inserting the shaft into the bore of the magnet. During insertion, the shaft may be rotated relative to the magnet in order to obtain better adhesive dispensing. The disadvantages are as follows: 1. as the length of the magnet increases, it becomes increasingly difficult to continuously dispense adhesive along the entire length of the bore, resulting in weaker bond strength; 2. the selection requirement of the adhesive is high, the liquid adhesive is easy to pollute the surfaces of the magnetic steel and the shaft, and the subsequent treatment is troublesome; 3. the shaft and the magnetic steel are bonded only by forming a layer of bonding surface on the surface, and the bonding surface is easy to tear under the condition of high rotating speed, so the strength is not enough.
Alternatively, the magnet may be adhered to the shaft by inserting the shaft into the hole of the magnet and then injecting an adhesive into the gap between the shaft and the magnet. The disadvantages are as follows: 1. the whole contact surface of the shaft and the magnet is generally difficult to be uniformly distributed, and the connection can be weakened; 2. this is particularly true when the gap is relatively small; 3. the operation requirement of the post-adding process of the adhesive is high, the operation efficiency is low, and the limitation is more; in addition, the type of adhesive used and the post-treatment significantly affect the adhesion strength required for high-speed rotation.
By heating the intermediate assembly, the magnetic steel naturally overflows glue and then is bonded to the shaft. The specific method comprises the following steps: providing a magnet in an uncured state, the magnet comprising magnetic powder and a binder; providing a shaft to which the magnet is to be secured; and assembling the intermediate rotor assembly with the uncured magnets on the shaft. The intermediate rotor assembly is then heated and the magnet is cured, allowing a quantity of adhesive to escape from the magnet, thereby forming a bond between the magnet and the shaft. The advantages are that: 1. the process is more convenient compared with the method of adding the adhesive; 2. an adhesive strength satisfying a high rotational speed of the rotor can be formed. The disadvantages are as follows: 1. in order to achieve the bonding performance exceeding a certain strength, the process is relatively limited, and the fit clearance between the magnet and the shaft is required to be as small as possible, so that the requirement on the manufacturing precision of the magnet and the shaft is high, and the manufacturing difficulty is high; 2. the shaft is selected from a shaft (such as a ceramic shaft) with large roughness, and the bonding performance of the optical axis is difficult to meet the use requirement of high rotating speed; 3. the glue overflow amount of the magnetic steel is difficult to control, the size is easily influenced, a plurality of programs are needed to control, and the processing and manufacturing difficulty is high.
While each of the manufacturing approaches described above have certain limitations, there is a need for an improved approach to remedy and alleviate the above-mentioned problems.
Disclosure of Invention
The present invention is directed to overcoming the disadvantages of the prior art and providing a method of manufacturing a rotor assembly.
The purpose of the invention is realized by the following technical scheme: a method of manufacturing a rotor assembly comprising the steps of:
(1) uniformly mixing the magnetic powder and the first binder, and pressing the mixture into an uncured magnet by using a die;
(2) mixing a second binder and an organic solvent to obtain a diluted solution, and arranging the diluted solution on a shaft;
(3) combining the magnet obtained in step (1) and the shaft obtained in step (2);
(4) the magnet and shaft are heat cured.
Further, the material of the shaft is a metal material or a ceramic material.
Further, in the step (2), the area where the solution is arranged is a corresponding position where the shaft is matched with the magnetic steel.
Further, the surface of the shaft is knurled.
Further, the organic solvent is an acetone solution.
Furthermore, the first binder and the second binder are both thermosetting adhesives.
Further, in the step (4), the heating temperature is both the curing temperature of the second adhesive and the glue overflowing temperature of the first adhesive.
Further, an intermediate rotor assembly is provided on the shaft for positioning and balancing the rotor assembly.
Further, in the step (4), the curing atmosphere is a heating oven or a heating tunnel furnace.
The invention has the beneficial effects that: according to the invention, the binding agent is brushed on the binding area of the rotor core and the rotor magnetic steel, the rotor magnetic steel is combined to the rotor core matching area, and the binding agent in the rotor magnetic steel is combined with the binding agent brushed on the binding area in an integral heating and curing manner, so that the binding performance with higher strength is realized. Because brush the binder in advance on the axle and can guarantee that the bonding region binder is full of, effectively combine with the binder that overflows in the curing process, guarantee that the bonding region is comprehensive and effectively covered, be favorable to making the cohesion of subassembly reach the at utmost. The invention can make up that the shaft texture is deep and the overflow glue on the inner side of the magnet can not be filled fully, and make up the limitation of a shaft system; the influence of the fit clearance between the shaft and the magnetic steel on the press-off force and the limitation of selecting the shaft are compensated; the proportion of the internal and external adhesives is effectively adjusted, the glue amount of the magnetic steel is favorably controlled, and the external diameter size of the magnetic steel and the pressing density of the magnetic steel are ensured; the press-disengaging force of the shaft and the magnetic steel can be increased, the production and processing are improved, and the bonding strength of the product is improved.
Drawings
FIG. 1 is a schematic illustration of a product made by the present invention;
FIG. 2 is a process schematic of one embodiment of the invention;
FIG. 3 is a schematic view of the oven heating of the present invention;
fig. 4 is a flow chart of the present invention.
Detailed Description
The invention relates to a method for manufacturing a rotor assembly, which is characterized in that a binder is supplemented in advance, the binder is mutually bonded with a binder overflowing from magnetic steel at a certain temperature, and a rotor core is bonded and stabilized with the inner wall of the magnetic steel while the magnetic steel is solidified, as shown in figure 4, the method specifically comprises the following steps:
(1) uniformly mixing the magnetic powder and the first binder, and pressing the mixture into an uncured magnet by using a die; the first binder is a thermosetting adhesive.
(2) Dissolving the second binder in an organic solvent (such as an acetone solution) according to a certain proportion, and uniformly stirring to obtain a diluted binder, wherein the flowability is enhanced; brushing the diluted binder on the corresponding position where the shaft is matched with the magnetic steel by using a brush; adjusting the proportion of the second binder and the organic solvent according to the fit clearance between the magnet and the shaft; the second binder is a thermosetting adhesive.
(3) Arranging a magnet on the shaft brushed with the glue, and positioning the magnet through steps on the shaft, other parts arranged on the shaft or an external positioning plate; the shaft can be made of high-temperature resistant materials such as metal materials, ceramic materials and the like.
(4) As shown in fig. 3, the combined magnet and the shaft are heated and cured together, so that the first adhesive overflowing from the inner hole part of the magnet after being heated is combined with the second adhesive brushed on the shaft at a certain temperature, and then the magnet and the shaft are fixed on the shaft; the temperature is not only the curing temperature of the second binder, but also the glue overflowing temperature of the first binder carried by the magnetic steel. The final manufacture results in a rotor assembly as shown in figure 1. The typical curing atmosphere has: a heating oven, a heating tunnel furnace, etc.
One embodiment of the present invention, as shown in FIG. 2, includes the following steps:
the method comprises the following steps: sleeving a balance ring on a rotor mandrel;
step two: brushing glue on the textured area by using a brush;
step three: sleeving a magnet on a glue brushing area of a shaft, and axially positioning through a balance ring;
step four: and heating and curing the assembled rotor assembly.
The invention adds a procedure of brushing the binder in advance, makes up the limitation of a shaft system, improves the processing and manufacturing difficulties caused by that the binder is adhered to the rotor core only by the glue overflowing inside the magnetic steel and the glue overflowing amount is not easy to control, and improves the adhesive strength to a certain extent; the shaft can be made of high-temperature resistant materials such as metal materials, ceramic materials and the like, and the surface of the shaft can be provided with knurled textures. Furthermore, one or more grooves may be provided in the surface of the shaft. As a result, the adhesive overflowing from the inner surface of the magnet during curing forms a firm bond with the adhesive coated on the rotor core shaft and the rotor core, thereby obtaining a rotor assembly that is satisfactory for high rotational speed rotation.
The invention combines five factors of adopting no glue overflow process for magnetic steel, adopting the glue overflow process for magnetic steel, adopting no glue on the shaft, coating common glue on the shaft and coating thermosetting glue on the shaft, designs a plurality of embodiments for comparison to obtain a table 1, and respectively illustrates the technical effects of the invention.
Table 1: comparison of binding force of binders on the same magnetic steel axis
The different serial numbers indicate that different types of common glue/thermosetting glue are adopted, and the embodiment with the same serial number adopts the same common glue/thermosetting glue for comparison. As can be seen from table 1, the bonding force of the embodiment coated with the common glue is weak, because after heating, the adhesive on the shaft fails before the magnetic steel overflows; the thermosetting adhesive has different softening temperature and curing temperature and time, which can cause the glue to be insoluble and influence the binding force; under the condition that the magnetic steel does not overflow glue, the glue is singly heated and solidified on the shaft, and because the magnetic steel needs gaps when put into the shaft and the surface of an inner hole of the magnetic steel is not smooth, the glue is melted and cannot be well adsorbed on the magnetic steel, so that the binding force is poor.
Claims (9)
1. A method of manufacturing a rotor assembly, comprising the steps of:
(1) the magnetic powder and the first binder are uniformly mixed and pressed into an uncured magnet by a die.
(2) The second binder and the organic solvent are mixed to obtain a diluted solution, and the diluted solution is disposed on the shaft.
(3) Combining the magnet obtained in step (1) and the shaft obtained in step (2).
(4) The magnet and shaft are heat cured.
2. A method of manufacturing a rotor assembly according to claim 1, wherein the material of the shaft is a metallic material or a ceramic material or the like.
3. The method of manufacturing a rotor assembly according to claim 1, wherein in the step (2), the region where the configuration solution is disposed is a corresponding position where the shaft is fitted to the magnetic steel.
4. The method of manufacturing a rotor assembly of claim 1 wherein the surface of the shaft is knurled.
5. The method of manufacturing a rotor assembly of claim 1, wherein the organic solvent is an acetone solution.
6. The method of manufacturing a rotor assembly of claim 1, wherein the first and second adhesives are both thermosetting adhesives.
7. The method of manufacturing a rotor assembly according to claim 6, wherein in the step (4), the heating temperature is both the curing temperature of the second adhesive and the flash temperature of the first adhesive.
8. A method of manufacturing a rotor assembly as claimed in claim 1, wherein an intermediate rotor assembly is provided on the shaft for locating and balancing the rotor assembly.
9. The method for manufacturing a rotor assembly according to claim 1, wherein in the step (4), the curing atmosphere is a heating oven or a heating tunnel furnace or the like.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011353533.XA CN112564436A (en) | 2020-11-26 | 2020-11-26 | Method of manufacturing a rotor assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011353533.XA CN112564436A (en) | 2020-11-26 | 2020-11-26 | Method of manufacturing a rotor assembly |
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| Publication Number | Publication Date |
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| CN112564436A true CN112564436A (en) | 2021-03-26 |
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| CN202011353533.XA Pending CN112564436A (en) | 2020-11-26 | 2020-11-26 | Method of manufacturing a rotor assembly |
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| CN110138157A (en) * | 2019-06-13 | 2019-08-16 | 苏州凯航电机有限公司 | A kind of process equipment and processing method of high-axiality brushless electric motor rotor |
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| CN110752724A (en) * | 2019-12-02 | 2020-02-04 | 北京泓慧国际能源技术发展有限公司 | Permanent magnet motor rotor manufacturing method, motor rotor and permanent magnet motor |
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| CN111969745A (en) * | 2020-09-16 | 2020-11-20 | 沈阳工业大学 | High-speed surface-mounted permanent magnet motor rotor structure and manufacturing method |
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Application publication date: 20210326 |