CN113691085B - Manufacturing method of squirrel cage assembly and squirrel cage assembly - Google Patents
Manufacturing method of squirrel cage assembly and squirrel cage assembly Download PDFInfo
- Publication number
- CN113691085B CN113691085B CN202110762712.7A CN202110762712A CN113691085B CN 113691085 B CN113691085 B CN 113691085B CN 202110762712 A CN202110762712 A CN 202110762712A CN 113691085 B CN113691085 B CN 113691085B
- Authority
- CN
- China
- Prior art keywords
- face
- end ring
- rotor core
- cage assembly
- ring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
- H02K15/0012—Manufacturing cage rotors
-
- 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
- H02K1/22—Rotating parts of the magnetic circuit
-
- 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
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K17/00—Asynchronous induction motors; Asynchronous induction generators
- H02K17/02—Asynchronous induction motors
- H02K17/16—Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K17/00—Asynchronous induction motors; Asynchronous induction generators
- H02K17/02—Asynchronous induction motors
- H02K17/16—Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors
- H02K17/165—Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors characterised by the squirrel-cage or other short-circuited windings
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Manufacture Of Motors, Generators (AREA)
Abstract
The invention provides a manufacturing method of a squirrel cage assembly, and relates to the field of electric appliances. The manufacturing method of the squirrel cage assembly comprises the following steps: processing to obtain a guide bar and a rotor core, wherein the rotor core is provided with two end faces opposite to each other in a first direction; penetrating the guide bars through the rotor core along a first direction and protruding outwards from two end surfaces; obtaining a corresponding end ring close to each end face through additive manufacturing; wherein, the end rings are fixedly connected with the guide bars; in the first direction, the distance between each end face and the corresponding end ring is smaller than a preset value. The manufacturing method of the squirrel-cage assembly improves the integrity of the squirrel-cage assembly, optimizes the natural frequency of the squirrel-cage assembly, further ensures that the squirrel-cage assembly is not easy to resonate with external excitation in the operation process, reduces vibration, and further prolongs the service life of the squirrel-cage assembly.
Description
Technical Field
The invention relates to the field of electric appliances, in particular to a manufacturing method of a squirrel-cage assembly and the squirrel-cage assembly.
Background
The motor rotor is a rotating part in the motor, and the squirrel-cage motor rotor generally comprises a motor rotating shaft and a squirrel-cage assembly, wherein the squirrel-cage assembly is sleeved outside the motor rotating shaft. The relevant squirrel cage assembly is generally formed by splicing a plurality of parts, and the spacing of the parts of the squirrel cage assembly after the splicing is completed is controlled by controlling the dimensional tolerance of the parts of the squirrel cage assembly and by controlling an assembly dimension chain in the assembly process. The squirrel-cage assembly can generate larger vibration when rotating, and the service life of the squirrel-cage assembly is shortened.
Disclosure of Invention
The invention provides a manufacturing method of a squirrel-cage assembly and the squirrel-cage assembly, which are used for solving the technical problems of reducing vibration generated by the squirrel-cage assembly during rotation and prolonging the service life of the squirrel-cage assembly.
The embodiment of the invention provides a manufacturing method of a squirrel cage assembly, which comprises the following steps: processing to obtain a guide bar and a rotor core, wherein the rotor core is provided with two end faces which are opposite in a first direction; penetrating the guide bars through the rotor core along a first direction and protruding outwards from the two end surfaces; obtaining a corresponding end ring close to each end face through additive manufacturing; wherein, the end rings are fixedly connected with the guide bars; in the first direction, the distance between each end face and the corresponding end ring is smaller than a preset value.
Further, the manufacturing by additive manufacturing to obtain a corresponding end ring close to each end face includes: forming a corresponding end ring from each of the end faces outwardly in the first direction by additive manufacturing; wherein, in the first direction, one end of the end ring is located outside the guide bar.
Further, forming a corresponding end ring from each of the end faces outwardly by additive manufacturing, comprising: spraying metal powder on the end face, and sintering the metal powder to form a first section layer fixedly connected with the guide bar; and spraying metal powder on the first cross-sectional layer and sintering to sequentially form additional cross-sectional layers, so that the first cross-sectional layer and each additional cross-sectional layer are solidified to form the end ring.
Further, the manufacturing of the corresponding end ring by additive manufacturing to be close to each end face further comprises: after the end ring corresponding to one end face is manufactured, a limiting force is applied to the rotor core in a direction of the end ring corresponding to the one end face of the rotor core.
The embodiment of the invention also provides a squirrel cage assembly, which comprises: a rotor core having opposite first and second end faces along the first direction; the guide bars are arranged at intervals around the first direction, penetrate through the rotor core and protrude outwards from the first end face and the second end face; a first end ring located outside the rotor core; the first end ring is arranged close to the first end surface relative to the second end surface in the first direction and is fixedly connected with the guide bar; the distance between the first end ring and the first end face is smaller than a preset value; a second end ring located outside the rotor core; the second end ring is arranged close to the second end face relative to the first end face in the first direction and is fixedly connected with the conducting bar; and the distance between the second end ring and the second end face is smaller than a preset value.
Further, the preset value is 5 mm.
Further, the first end ring abuts against the first end face, and the second end ring abuts against the second end face.
Further, the first end ring and the second end ring each have a mounting slot for receiving one end of the guide bar and the other end opposite the one end.
Further, a first limiting structure is arranged at the part of the guide bar, which is positioned in the mounting groove, and the wall surfaces of the first end ring and the second end ring, which are adjacent to the mounting groove, are provided with a second limiting structure, and the second limiting structure is abutted to the first limiting structure so as to limit the movement of the first end ring relative to the guide bar and the movement of the second end ring relative to the guide bar.
Further, the first limiting structure is a limiting groove, the second limiting structure is a limiting boss, and at least a part of the limiting boss is located in the limiting groove.
Further, the rotor core is provided with a positioning groove, and the positioning groove extends from the first end face to the second end face; a portion of the guide bar is positioned in the positioning groove.
The embodiment of the invention provides a manufacturing method of a squirrel cage assembly, which comprises the following steps: processing to obtain a guide bar and a rotor core, wherein the rotor core is provided with two end faces opposite to each other in a first direction; penetrating the guide bar through the rotor core along the first direction and protruding outwards from the two end surfaces; obtaining a corresponding end ring close to each end face through additive manufacturing; the end rings are fixedly connected with the guide bars, and in the first direction, the distance between each end face and the corresponding end ring is smaller than a preset value. Namely, after the assembly of the guide bars and the rotor core is completed, the end ring is manufactured according to the actual position of the end face of the rotor core, so that the influence of manufacturing errors of the rotor core and the guide bars on the distance between the end face of the rotor core and the corresponding end ring is reduced, meanwhile, the end ring is manufactured through additive manufacturing, the size of the end ring can be adaptively adjusted according to the actual position of the rotor core, the size of the end ring is enabled to have higher precision, the floating range of the distance between the end face of the rotor core and the corresponding end ring is reduced, and the distance between the end face of the rotor core and the corresponding end ring is enabled to be smaller than a preset value on the premise that the assembly interference between the rotor core and the end ring does not occur. The distance between the end face of the rotor core and the corresponding end ring is smaller than a preset value, so that the movement of the rotor core along the first direction relative to the end ring is limited in a small range through the end ring, the integrity of the squirrel-cage assembly is improved, the natural frequency of the squirrel-cage assembly is optimized, resonance is not easy to occur with external excitation in the operation process of the squirrel-cage assembly, vibration is reduced, and the service life of the squirrel-cage assembly is prolonged. Meanwhile, the distance between the end face of the rotor core and the corresponding end ring is smaller than a preset threshold value, and noise generated in the operation process of the squirrel cage assembly can be reduced.
Drawings
FIG. 1 is a schematic flow chart of a method for manufacturing a squirrel cage assembly according to an embodiment of the present invention;
FIG. 2 is a flow chart of another method of manufacturing a squirrel cage assembly according to an embodiment of the present invention;
FIG. 3 is a flow chart illustrating another method of manufacturing a squirrel cage assembly according to an embodiment of the present invention;
FIG. 4 is an exploded view of a first view of a squirrel cage assembly according to an embodiment of the present invention;
FIG. 5 is an exploded view of a second view of a squirrel cage assembly according to an embodiment of the present invention;
FIG. 6 is a schematic diagram illustrating the assembly of a guide bar, a first end ring, and a second end ring in a squirrel cage assembly according to an embodiment of the present invention;
FIG. 7 is an exploded view of a bar and rotor core in a squirrel cage assembly according to an embodiment of the present invention.
Reference numerals illustrate:
1. a squirrel cage assembly; 10. a rotor core; 11. a first end face; 12. a second end face; 13. a positioning groove; 20. a conducting bar; 21. a first limit structure; 30. a first end ring; 40. a second end ring; 50. a mounting groove; 60. and the second limiting structure.
Detailed Description
The individual features described in the specific embodiments can be combined in any suitable manner, without contradiction, for example by combination of different specific features, to form different embodiments and solutions. Various combinations of the specific features of the invention are not described in detail in order to avoid unnecessary repetition.
In a specific embodiment, the squirrel cage assembly may be any type of squirrel cage assembly, for example, the squirrel cage assembly may be a copper bar squirrel cage assembly, and the squirrel cage assembly may also be a cast aluminum squirrel cage assembly, and the form of the squirrel cage assembly is not limited in the following embodiments, and the specific form of the squirrel cage assembly only has an effect on the material from which the squirrel cage assembly is manufactured, and does not have any effect on the manufacturing method of the squirrel cage assembly.
In some embodiments, as shown in fig. 1, the main flow of the manufacturing method of the squirrel cage assembly comprises:
step S101, machining to obtain a guide bar and a rotor core, wherein the rotor core has two end faces opposite in the first direction.
The guide bar can be obtained by any processing method, and the processing method of the guide bar can be forging or rolling forming. The rotor core is made of a metal material with high saturation induction intensity, which is used for enhancing the electromagnetic induction intensity of the squirrel cage assembly, and the metal material can be silicon steel. Optionally, the rotor core is formed by laminating and fixing a plurality of layers of metal sheets with high saturation magnetic induction intensity, and the metal sheets can be silicon steel sheets.
The rotor core has two opposite end faces in the first direction, which are hereinafter referred to as a first end face and a second end face, respectively, for convenience of explanation. Optionally, the first direction is a length direction of the rotor core, and the plurality of metal sheets are stacked along the length direction to form the rotor core.
Step S102, penetrating the guide bars through the rotor core along the first direction and protruding outwards from the two end faces.
Specifically, the guide bar is provided with a first end and a second end which are opposite along a first direction, the first end of the guide bar protrudes out of the first end face of the rotor core after the guide bar penetrates through the rotor core, and the second end of the guide bar protrudes out of the second end face of the rotor core. The guide bars are arranged at intervals circumferentially around the first direction, and penetrate through the rotor core along the first direction.
Step S103, obtaining a corresponding end ring close to each end face through additive manufacturing.
Specifically, two end rings are manufactured through additive manufacturing, wherein the end ring close to the first end face of the rotor core is a first end ring, the end ring close to the second end face of the rotor core is a second end ring, namely, the distance between the first end ring and the first end face is smaller than that between the second end ring and the first end face, and the distance between the second end ring and the second end face is smaller than that between the second end ring and the first end face.
The end rings are fixedly connected with the guide bars, specifically, the first end ring is fixedly connected with a part of the guide bars, which extends out of the first end face of the rotor core, and the second end ring is fixedly connected with a part of the guide bars, which extends out of the second end face of the rotor core. It should be noted that, the first end ring and the second end ring are fixedly connected with the conducting bars in the additive manufacturing process, rather than after the first end ring and the second end ring are obtained through additive manufacturing, the first end ring and the second end ring are respectively fixed on the conducting bars, and good integration is achieved between the two end rings and the conducting bars.
Meanwhile, in the first direction, the distance between each end face and the corresponding end ring is small and a preset value, specifically, the distance between the first end face and the first end ring is smaller than the preset value, and the distance between the second end face and the second end ring is smaller than the preset value, and optionally, the preset value can be 5 mm. The distance between the end face of the rotor core and the corresponding end ring is smaller than a preset value, so that the movement of the rotor core relative to the end ring along the first direction is limited in a small range through the end ring, vibration caused by the movement of the rotor core relative to the end ring along the first direction in the running process of the squirrel-cage assembly is reduced, and the service life of the squirrel-cage assembly is prolonged. Meanwhile, the distance between the end face of the rotor core and the corresponding end ring is smaller than a preset value, so that noise generated in the operation process of the squirrel cage assembly can be reduced, and the principle of noise reduction is described below. The distance between the end ring of the related squirrel cage assembly and the end face of the rotor core is larger, the length of the conducting bars exposed in the air between the end ring and the end face of the rotor core is longer, and in the rotating process of the squirrel cage assembly, the conducting bars of the part continuously stir the air, so that larger noise is generated; the end ring of the squirrel-cage assembly and the end face of the corresponding rotor core are smaller than a preset threshold, the length of the conducting bars exposed in the air between the end ring and the end face of the rotor core is shorter, and in the rotating process of the squirrel-cage assembly, the air stirring capacity of the conducting bars is weakened, so that noise generated in the operation process of the squirrel-cage assembly is reduced.
Compared with the manufacturing method of the squirrel cage assembly by controlling the dimensional tolerance of each part of the squirrel cage assembly and controlling the related manufacturing method of the squirrel cage assembly for assembling the dimensional chain, the manufacturing method of the squirrel cage assembly provided by the embodiment of the invention can reduce the distance between the rotor core and the corresponding end ring, and the principle that the manufacturing method of the squirrel cage assembly provided by the embodiment of the invention can reduce the distance between the rotor core and the corresponding end ring is described below.
In the manufacturing method of the related squirrel-cage assembly, the rotor core, the guide bars and the end rings are required to be obtained firstly, then the rotor core, the guide bars and the end rings are spliced at preset positions, so that the squirrel-cage assembly is obtained, in the assembling process, the sizes of the rotor core, the guide bars and the end rings cannot be changed, the distance between the end face of the rotor core and the corresponding end rings is influenced by manufacturing errors of the rotor core, manufacturing errors of the end rings and assembling errors, the distance between the end face of the rotor core and the corresponding end rings can float in a larger range, the distance between the end face of the rotor core and the corresponding end rings is required to be larger, so that assembling interference between the rotor core and the end rings is prevented, and meanwhile, in the manufacturing method of the related squirrel-cage assembly, the end rings and the guide bars are fixed through welding, and a larger distance is required between the end rings and the end face of the rotor core in order to reduce the influence of high temperature generated during welding. In the manufacturing method of the squirrel-cage assembly provided by the embodiment of the invention, the guide bars and the rotor core are assembled, and then the two end rings corresponding to the two end faces of the rotor core are manufactured through additive manufacturing according to the actual positions of the end faces of the rotor core. The end ring is manufactured by taking the actual position of the end face of the rotor core as a reference, so that the influence of manufacturing errors of the rotor core and assembly errors of the rotor core and the guide bars on the distance between the end face of the rotor core and the corresponding end ring is reduced, and the distance between the end face of the rotor core and the corresponding end ring is mainly influenced by the size of the end ring and the size error of the end ring; meanwhile, the end ring is manufactured through additive manufacturing, the size of the end ring can be adaptively adjusted according to the actual position of the end face of the rotor core, and the additive manufacturing is a manufacturing method with higher precision, namely, the size of the end ring can be adaptively adjusted according to the actual position of the end face of the rotor core, and the size error of the end ring is smaller, so that the distance between the end face of the rotor core and the corresponding end ring floats in a smaller range, and the distance between the end face of the rotor core and the corresponding end ring is reduced on the premise that the rotor core and the end ring do not interfere in assembly. It should be noted that, fixing the conductive bars and the end ring by welding requires consuming solder and soldering flux, and the solder is generally silver solder with relatively high price, and forming the end ring directly on the conductive bars by additive manufacturing to solidify the end ring with the conductive bars, thereby saving the solder and soldering flux and reducing the cost of consumable materials used in the manufacturing process of the squirrel cage assembly.
Wherein additive manufacturing may be a manufacturing method in which successive material layers are provided on top of each other to build up a three-dimensional part layer by layer, adjacent material layers being melted between them to form an integral part. It should be understood that additive manufacturing in embodiments of the present invention refers to manufacturing by adding material primarily during manufacturing, but may also be performed in a specific manufacturing process with additional processing steps, such as layer addition processing, layer subtraction processing, or hybrid processing. Additive manufacturing may be by any one of fused deposition modeling, selective laser sintering, stereolithography, electron beam sintering, and the like.
The embodiment of the invention provides a manufacturing method of a squirrel cage assembly, which comprises the following steps: processing to obtain a guide bar and a rotor core, wherein the rotor core is provided with two end faces opposite to each other in a first direction; penetrating the guide bar through the rotor core along the first direction and protruding outwards from the two end surfaces; obtaining a corresponding end ring close to each end face through additive manufacturing; the end rings are fixedly connected with the guide bars, and in the first direction, the distance between each end face and the corresponding end ring is smaller than a preset value. Namely, after the assembly of the guide bars and the rotor core is completed, the end ring is manufactured according to the actual position of the end face of the rotor core, so that the influence of manufacturing errors of the rotor core and the guide bars on the distance between the end face of the rotor core and the corresponding end ring is reduced, meanwhile, the end ring is manufactured through additive manufacturing, the size of the end ring can be adaptively adjusted according to the actual position of the rotor core, the size of the end ring is enabled to have higher precision, the floating range of the distance between the end face of the rotor core and the corresponding end ring is reduced, and the distance between the end face of the rotor core and the corresponding end ring is enabled to be smaller than a preset value on the premise that the assembly interference between the rotor core and the end ring does not occur. The distance between the end face of the rotor core and the corresponding end ring is smaller than a preset value, so that the movement of the rotor core along the first direction relative to the end ring is limited in a small range through the end ring, the integrity of the squirrel-cage assembly is improved, the natural frequency of the squirrel-cage assembly is optimized, resonance is not easy to occur with external excitation in the operation process of the squirrel-cage assembly, vibration is reduced, and the service life of the squirrel-cage assembly is prolonged. Meanwhile, the distance between the end face of the rotor core and the corresponding end ring is smaller than a preset threshold value, and noise generated in the operation process of the squirrel cage assembly can be reduced.
In some embodiments, the end rings may be machined from any order in the first direction by additive manufacturing. Optionally, along the first direction, forming an end ring corresponding to the end surface by additive manufacturing from the end of the guide bar to a preset position close to the corresponding end surface, wherein the distance between the preset position and the first end surface is smaller than a preset value. Specifically, along a first direction, forming a first end ring corresponding to the first end surface through additive manufacturing from the end part of the guide bar extending out of the first end surface to a preset position close to the first end surface; and forming a second end ring corresponding to the second end surface through additive manufacturing from the end part of the guide bar, which extends out of the second end surface, to a preset position close to the second end surface along the first direction. Optionally, in the first direction, an end ring corresponding to the end face is formed by additive manufacturing from an end face of the rotor core toward an end portion of the bar. Specifically, in a first direction, forming a first end ring corresponding to the first end face by additive manufacturing from the first end face of the rotor core toward the end of the portion of the bar extending from the first end face; in the first direction, the second end face corresponding to the second end face is formed by additive manufacturing from the second end face of the rotor core to the end part of the guide bar, which extends out of the second end face.
In some embodiments, as shown in fig. 2, the manufacturing method of the squirrel cage assembly provided in this embodiment is different from the manufacturing method of the squirrel cage assembly shown in fig. 1 in that step S103 in fig. 1 includes:
step S201, forming a corresponding end ring by additive manufacturing from each end face outwards along the first direction.
Specifically, along a first direction, a first end ring is manufactured by additive manufacturing from a first end face of the rotor core facing away from the first end face, and a second end ring is manufactured by additive manufacturing from a second end face of the rotor core facing away from the second end face. The end part of the rotor core is directly used as the initial base surface for additive manufacturing, so that the distance between the end ring obtained through additive manufacturing and the end surface of the corresponding rotor core is zero, namely, the end ring can be abutted against the end surface of the corresponding rotor core, thereby further reducing the movement of the rotor core relative to the end ring along the first direction, further reducing the vibration caused by the movement of the rotor core relative to the end ring along the first direction in the operation process of the squirrel cage assembly, and further prolonging the service life of the squirrel cage assembly.
Wherein one side of the end ring is located outside the bars, i.e. the end ring obtained by additive manufacturing, extends in a first direction from the corresponding end face of the rotor core in a direction away from the end face until it extends beyond the corresponding end of the bars. Specifically, the first end ring obtained by additive manufacturing extends from the first end face of the rotor core to a direction far away from the first end face along a first direction until the first end extends to exceed the first end of the guide bar, wherein the first end is the end part of the guide bar protruding out of the first end face; and the second end ring is manufactured by additive, extends from the second end face of the rotor core to a direction far away from the second end face along the first direction, and extends to the end part exceeding the second end of the guide bar and being the part of the guide bar protruding out of the second end face. The first end ring extends to a first preset position beyond the first end of the guide bar along the first direction, and the distance between the first preset position and the first end of the guide bar is preset, for example, the preset distance can be 5 mm; the second end ring extends in the first direction to a second predetermined position beyond the second end of the guide bar, the second predetermined position being spaced a predetermined distance from the second end of the guide bar, which may be, for example, 5 millimeters. The end ring manufactured by additive manufacturing has a force for fixing the end ring and the guide bars between contact surfaces of the end ring and the guide bars due to melting of materials, and the larger the contact area between the end ring and the guide bars is, the more stable the connection between the end ring and the guide bars is. The end ring extends to the outer side of the conducting bars from the end part of the rotor core along the first direction, and the size of the part of the conducting bars extending out of the end face of the rotor core along the first direction is fully utilized, so that the contact area between the end ring and the conducting bars is increased, the connection between the end ring and the conducting bars is more stable, and meanwhile, the conductivity between the conducting bars and the end ring is improved.
In some embodiments, to more clearly illustrate the process of additive manufacturing to obtain an end ring, the process of manufacturing an end ring is illustrated below by way of example in connection with fig. 3 in which the process of additive manufacturing is performed by a selective laser sintering method, and it should be understood by those skilled in the art that end rings may also be obtained by other additive manufacturing methods. The consolidation between the end ring and the conducting bar obtained by the selective laser sintering method is good, so that the squirrel cage assembly has high structural strength.
As shown in fig. 3, the manufacturing method of the squirrel-cage assembly provided in this embodiment is different from the manufacturing method of the squirrel-cage assembly shown in fig. 2 in that step S201 in fig. 2 includes:
step S301: and spraying metal powder on the end face of the rotor core, and sintering the metal powder to form a first section layer fixedly connected with the guide bar.
Specifically, according to the shape of the end ring, a predetermined portion of the metal powder is melted by laser, and the melted metal powder is solidified to form a first cross-sectional layer. Meanwhile, in the process of sintering the metal powder by laser, the metal powder near the conducting bar is melted, and the metal powder at the part is solidified and then is solidified with the outer surface of the conducting bar into a whole, so that the first section layer is fixedly connected with the conducting bar. In this step, the metal powder is melted by the laser, but the thickness of the sprayed metal powder is thin, and only the metal powder in the preset part is required to be melted, so that the time of the laser acting on the metal powder is short, and the influence of the heat generated by the laser on the end part of the rotor core is small or negligible.
Step S302, spraying metal powder on the first cross-sectional layer and sequentially forming additional cross-sectional layers in order to solidify the first cross-sectional layer and each additional cross-sectional layer to form an end ring.
Specifically, after the sintering of the first section layer is completed, according to the shape of the end ring, a preset part of metal powder is melted by laser, the melted technical powder is solidified to form another section layer, in the process of melting the metal powder, the section layer is solidified with the first section layer, meanwhile, the metal powder near the conducting bar is melted, and the part of metal powder is solidified and integrated with the outer surface of the conducting bar, so that the other section layer is fixedly connected with the conducting bar. And repeating the steps of spraying metal powder on the newly formed section layer from the end surface of the rotor core to the direction away from the end surface along the first direction, sintering the metal powder into another section layer by laser according to the shape of the end ring until the newly formed section layer reaches the outer side of the conducting bar, thereby obtaining the end ring by additive manufacturing.
It should be noted that, one side of the end ring is located at the outer side of the guide bar, i.e. the end ring obtained by additive manufacturing, extends from the corresponding end face of the rotor core in the first direction away from the end face until reaching beyond the corresponding end of the guide bar. Specifically, the first end ring obtained by additive manufacturing extends from the first end face of the rotor core to a direction far away from the first end face along a first direction until the first end extends to exceed the first end of the guide bar, wherein the first end is the end part of the guide bar protruding out of the first end face; and the second end ring is manufactured by additive, extends from the second end face of the rotor core to a direction far away from the second end face along the first direction, and extends to the end part exceeding the second end of the guide bar and being the part of the guide bar protruding out of the second end face. The first end ring extends to a first preset position beyond the first end of the guide bar along the first direction, and the distance between the first preset position and the first end of the guide bar is preset, for example, the preset distance can be 5 mm; the second end ring extends in the first direction to a second predetermined position beyond the second end of the guide bar, the second predetermined position being spaced a predetermined distance from the second end of the guide bar, which may be, for example, 5 millimeters. The end ring manufactured by additive manufacturing has a force for fixing the end ring and the guide bars between contact surfaces of the end ring and the guide bars due to melting of materials, and the larger the contact area between the end ring and the guide bars is, the more stable the connection between the end ring and the guide bars is. The end ring extends to the outer side of the conducting bars from the end part of the rotor core along the first direction, and the size of the part of the conducting bars extending out of the end face of the rotor core along the first direction is fully utilized, so that the contact area between the end ring and the conducting bars is increased, the connection between the end ring and the conducting bars is more stable, and meanwhile, the conductivity between the conducting bars and the end ring is improved.
In some embodiments, after one end ring is manufactured by additive manufacturing, the other end ring is manufactured by additive manufacturing, and after the end ring corresponding to the one end surface is manufactured, a limiting force is applied to the rotor core in a direction of the end surface of the rotor core to the end ring corresponding to the rotor core, so that relative movement between the rotor core and the formed end ring is reduced in the process of manufacturing the end ring corresponding to the other end surface. The first end ring corresponding to the first end face of the rotor core is manufactured through the additive, then a limiting force from the first end face to the first end ring is applied to the rotor core, the limiting force is continuously applied, meanwhile, the second end ring corresponding to the second end face of the rotor core is manufactured through the additive, and therefore relative movement between the rotor core and the first end ring in the process of manufacturing the second end ring through the additive is reduced.
Alternatively, in the additive manufacturing by the selective laser sintering method, in order to reduce the influence of gravity on the additive manufacturing, the first end ring and the second end ring may be manufactured separately. Specifically, the rotor core is rotated, so that the first end face of the rotor core is approximately parallel to the horizontal plane, and a first end ring is formed by additive manufacturing from the first end face outwards along a first direction; after the first end ring is formed, the rotor core is rotated again such that the second end face of the rotor core is substantially parallel to the horizontal plane, and a second end ring is formed from the second end face outwardly in the first direction by additive manufacturing. The horizontal plane may be a plane of relatively completely stationary water, and the horizontal plane may be perpendicular to a direction of gravity, so that the first end face and the second end face are respectively substantially parallel to the horizontal plane in a process of manufacturing the first end ring and the second end ring through additive manufacturing, so that the first end face can bear metal powder for forming the first end ring in a process of manufacturing the first end ring through additive manufacturing, and the second end face can bear metal powder for forming the second end ring in a process of manufacturing the second end ring through additive manufacturing, without additional bearing structures.
The embodiment of the invention also provides a squirrel cage assembly which can be any type of squirrel cage assembly, for example, the squirrel cage assembly can be a copper squirrel cage assembly, the squirrel cage assembly can also be an aluminum squirrel cage assembly, the form of the squirrel cage assembly is not limited in the following implementation, and the specific form of the squirrel cage assembly only has an effect on the material for manufacturing the squirrel cage assembly, but has no effect on the structure of the squirrel cage assembly.
In some embodiments, in combination with fig. 4 and 5, the squirrel cage assembly 1 comprises: the rotor core 10, the conductor bars 20, the first end ring 30 and the second end ring 40. The rotor core 10 has opposite first and second end faces 11, 12 in a first direction (the first direction being indicated by the arrows in fig. 4 and 5).
The plurality of guide bars 20 are arranged at intervals around the first direction, each guide bar 20 penetrates through the rotor core 10 and protrudes outwards from the first end face 11 and the second end face 12, namely, one end of each guide bar 20 protrudes from the first end face 11, and the other end of each guide bar 20 opposite to the end protruding from the first end face 11 protrudes from the second end face 12.
The first end ring 30 is located outside the rotor core, i.e. the first end ring 30 is arranged outside the space enclosed by the outer contour of the rotor core 10. The first end ring 30 is arranged close to the first end face 11 with respect to the second end face 12 in the first direction, i.e. the first end ring 30 is spaced from the first end face 11 less than the first end ring 30 is spaced from the second end face 12. And the distance between the first end ring 30 and the first end face 11 is smaller than a preset value.
The second end ring 40 is located outside the rotor core, i.e. the second end ring 40 is arranged outside the space enclosed by the outer contour of the rotor core 10. The second end ring 40 is arranged close to the second end face 12 with respect to the first end face 11 in the first direction, i.e. the distance between the second end ring 40 and the second end face 12 is smaller than the distance between the second end ring 40 and the first end face 11, and the distance between the second end ring 40 and the second end face 12 is smaller than a preset value. By making the distance between the first end face 11 and the first end ring 30 smaller than a preset value and making the distance between the second end face 12 and the second end ring 40 smaller than a preset value, the movement of the rotor core 10 along the first direction relative to the first end ring 30 and the second end ring 40 is limited within a small range by the first end ring 30 and the second end ring 40, so that the integrity of the squirrel-cage assembly is improved, the natural frequency of the squirrel-cage assembly is optimized, resonance with external excitation is not easy to occur in the operation process of the squirrel-cage assembly, vibration is reduced, and the service life of the squirrel-cage assembly is prolonged.
In some embodiments, the predetermined value is 5 millimeters, i.e., the first end ring 30 is less than 5 millimeters from the first end face 11 and the second end ring 40 is less than 5 millimeters from the second end face 12. Therefore, the distance of the rotor core 10 between the first end ring 30 and the second end ring 40 along the first direction is limited within 10 millimeters through the first end ring 30 and the second end ring 40, so that the integrity of the squirrel-cage assembly is improved, the natural frequency of the squirrel-cage assembly is optimized, resonance with external excitation is not easy to occur in the operation process of the squirrel-cage assembly, vibration is reduced, and the service life of the squirrel-cage assembly is prolonged.
In some embodiments, as shown in fig. 4, the first end ring 30 abuts against the first end surface 11, and the second end ring 40 abuts against the second end surface 12, that is, the distance between the first end ring 30 and the first end surface 11 is zero, and the distance between the second end ring 40 and the second end surface 12 is zero, so that the rotor core 10 cannot move along the first direction relative to the first end ring 30 and the second end ring 40 through the first end ring 30 and the second end ring 40, thereby improving the integrity of the squirrel-cage assembly, optimizing the natural frequency of the squirrel-cage assembly, further enabling the squirrel-cage assembly not to easily resonate with external excitation in the operation process, reducing vibration, and further prolonging the service life of the squirrel-cage assembly. Meanwhile, the first end ring 30 is abutted against the first end face 11, and the second end ring 40 is abutted against the second end face 12, so that the length of the guide bars exposed to the air between the end ring and the corresponding end face of the rotor core can be further reduced, and even the guide bars exposed to the air do not exist between the end ring and the corresponding end face of the rotor core, and therefore the air stirring capacity of the guide bars of the portion is further reduced, and noise generated in the rotating process of the squirrel cage assembly is further reduced.
In some embodiments, as shown in fig. 6, the first end ring 30 and the second end ring 40 each have a mounting groove 50, the mounting groove 50 being configured to receive one end of the guide bar 20 extending beyond the first end face 11 in fig. 4 and the other end of the guide bar 20 extending beyond the second end face 12 in fig. 4. Specifically, the first end ring 30 has a mounting groove 50, and one end of the guide bar 20 extending out of the first end surface 11 extends into the mounting groove 50 of the first end ring 30; the second end ring 40 has a mounting slot 50 and the end of the conductor 20 extending beyond the second end face 12 extends into the mounting slot 50 of the second end ring 40. It should be noted that, in the process of additive manufacturing, since the materials for manufacturing the first end ring 30 and the second end ring 40 are melted and solidified, a force is formed between the contact surfaces of the first end ring 30 and the guide bar 20 and between the contact surfaces of the second end ring 40 and the guide bar 20, so that the first end ring 30 and the guide bar 20 are solidified integrally, and the second end ring 40 and the guide bar are solidified integrally, and by providing the mounting grooves 50 in the first end ring 30 and the second end ring 40, the contact area between the first end ring 30 and the guide bar 20 and the contact area between the second end ring 40 and the guide bar 20 are increased, so that the first end ring 30 can be more firmly fixed to the guide bar 20, and the second end ring 40 can be more firmly fixed to the guide bar 20. Alternatively, the length of the guide bar 20 extending into the mounting slot 50 is between 5 mm and 10 mm.
In some embodiments, as shown in fig. 6, the portion of the guide bar 20 located in the mounting groove 50 is provided with a first limiting structure 21, and the wall surfaces of the first end ring 30 and the second end ring 40 adjacent to the mounting groove 50 are provided with a second limiting structure 60, and the second limiting structure 60 abuts against the first limiting structure 21 to limit the movement of the first end ring 30 relative to the guide bar 20, and the movement of the second end ring 40 relative to the guide bar 20. It should be noted that, by providing the first limiting structure 21 and the second limiting structure 60, the contact area between the first end ring 30 and the conducting bar 20 and the contact area between the second end ring 40 and the conducting bar 20 can be further increased, so that the first end ring 30 can be more firmly fixed to the conducting bar 20, and the second end ring 40 can be more firmly fixed to the conducting bar 20. Meanwhile, in the process of manufacturing the first end ring 30 and the second end ring 40 fixed to the guide bar 20 through additive manufacturing, insufficient acting force for fixedly connecting the first end ring 30 and the guide bar 20 may be caused due to insufficient melting and the like, or insufficient acting force for fixedly connecting the second end ring 40 and the guide bar 20 may be caused, so that the first end ring 30 and the second end ring 40 are separated from the guide bar 20 under the action of external load in the operation process of the squirrel cage assembly, and at the moment, the first end ring 30 and the second end ring 40 may be thrown out of the guide bar 20 in high-speed rotation and collide with other parts of the squirrel cage assembly, so that other parts of the squirrel cage assembly are crashed, even may be thrown out of the motor housing, and the personal safety of personnel around the motor is threatened. Through setting up first limit structure 21 and the second limit structure 60 of mutual butt, under the effort of first end ring 30 and conducting bar 20 fixed connection's effort is not enough, or under the circumstances that the effort of second end ring 40 and conducting bar 20 fixed connection is not enough, also can prevent under the effect of the butt between first limit structure 21 and the second limit structure 60 that first end ring 30 and second end ring 40 from being by conducting bar 20 departure, improved the security of squirrel cage subassembly.
In some embodiments, as shown in fig. 6, the first limiting structure 21 is a limiting groove, the second limiting structure 60 is a limiting boss, and at least a portion of the second limiting structure 60 (limiting boss) is located in the first limiting structure 21 (limiting groove), so that the first end ring 30 and the second end ring 40 are prevented from flying out of the guide bar 20 by the abutment force between the first limiting structure 21 (limiting groove) and the second limiting structure 60 (limiting boss), and the safety of the squirrel cage assembly is improved.
In some embodiments, as shown in fig. 7, the rotor core 10 is provided with a positioning groove 13, and the positioning groove 13 extends from the first end face 11 to the second end face 12 in fig. 4. A portion of the guide bar 20 is positioned in the positioning groove so as to facilitate assembly of the guide bar 20 with the rotor core 10. Optionally, the outer contour of the positioning groove 13 in the cross section perpendicular to the first direction coincides with the outer contour of the guide bar 20 in the cross section perpendicular to the first direction, thereby further facilitating the assembly between the guide bar 20 and the rotor core 10. Optionally, the number of the positioning slots 13 is equal to the number of the guide bars 20, and are disposed at intervals around the rotor core 10 in the first direction.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention.
Claims (7)
1. A method of manufacturing a squirrel cage assembly, the method comprising:
processing to obtain a guide bar and a rotor core, wherein the rotor core is provided with two end faces which are opposite in a first direction;
penetrating the guide bars through the rotor core along a first direction and protruding outwards from the two end surfaces;
obtaining a corresponding end ring close to each end face through additive manufacturing; wherein, the end rings are fixedly connected with the conducting bars in the additive manufacturing process; in the first direction, each end face abuts the corresponding end ring;
wherein the manufacturing by additive material to obtain a corresponding end ring close to each end face comprises:
forming a corresponding end ring from each of the end faces outwardly in the first direction by additive manufacturing; wherein, in the first direction, one end of the end ring is positioned outside the conducting bar;
the forming of the corresponding end ring from each of the end faces outwardly by additive manufacturing includes:
spraying metal powder on the end face, and sintering the metal powder to form a first section layer fixedly connected with the guide bar;
and spraying metal powder on the first cross-sectional layer and sintering to sequentially form additional cross-sectional layers, so that the first cross-sectional layer and each additional cross-sectional layer are solidified to form the end ring.
2. The method of manufacturing according to claim 1, wherein the obtaining, by additive manufacturing, a corresponding end ring adjacent to each end face further comprises:
after the end ring corresponding to one end face is manufactured, a limiting force is applied to the rotor core in a direction of the end ring corresponding to the one end face of the rotor core.
3. A squirrel cage assembly obtained by the manufacturing method according to any one of claims 1 to 2, comprising:
a rotor core having opposite first and second end faces along a first direction;
the guide bars are arranged at intervals around the first direction, penetrate through the rotor core and protrude outwards from the first end face and the second end face;
a first end ring located outside the rotor core; the first end ring is arranged close to the first end face relative to the second end face in the first direction, and the first end ring is arranged on the conducting bar in the way that
The first end face is used as a reference and is manufactured through additive manufacturing, so that the first end ring is fixedly connected with the guide bar and is abutted against the first end face;
a second end ring located outside the rotor core; the second end ring is arranged close to the second end face relative to the first end face in the first direction, and is manufactured by additive material on the conducting bar with the second end face as a reference, so that the second end ring is fixedly connected with the conducting bar and is abutted against the second end face.
4. A squirrel cage assembly according to claim 3, wherein the first end ring and the second end ring each have a mounting slot for receiving one end of the conductors and the other end opposite the one end.
5. The squirrel cage assembly of claim 4, wherein a portion of the guide bar within the mounting slot is provided with a first limit structure, and walls of the first end ring and the second end ring adjacent the mounting slot have a second limit structure that abuts the first limit structure to limit movement of the first end ring relative to the guide bar and movement of the second end ring relative to the guide bar.
6. The squirrel cage assembly of claim 5, wherein the first limit structure is a limit slot and the second limit structure is a limit boss, at least a portion of the limit boss being located in the limit slot.
7. A squirrel cage assembly according to claim 3, wherein the rotor core is provided with a detent and the detent extends from the first end face to the second end face; a portion of the guide bar is positioned in the positioning groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110762712.7A CN113691085B (en) | 2021-07-06 | 2021-07-06 | Manufacturing method of squirrel cage assembly and squirrel cage assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110762712.7A CN113691085B (en) | 2021-07-06 | 2021-07-06 | Manufacturing method of squirrel cage assembly and squirrel cage assembly |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113691085A CN113691085A (en) | 2021-11-23 |
| CN113691085B true CN113691085B (en) | 2023-07-28 |
Family
ID=78576687
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110762712.7A Active CN113691085B (en) | 2021-07-06 | 2021-07-06 | Manufacturing method of squirrel cage assembly and squirrel cage assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113691085B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4277096A1 (en) * | 2022-05-13 | 2023-11-15 | Siemens Aktiengesellschaft | Rotor of a cage rotor motor and method for producing the same |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103887934A (en) * | 2014-04-24 | 2014-06-25 | 洛阳轴研科技股份有限公司 | Finishing method of electric spindle squirrel cage rotor |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103904799B (en) * | 2014-03-25 | 2016-03-02 | 茂顺（泰兴）电光源科技有限公司 | A kind of processing technology of squirrel-cage rotor of motor |
| EP3136553B1 (en) * | 2015-08-26 | 2017-10-11 | Lakeview Innovation Ltd. | Stator system with a sheathing of plastic with improved heat dissipation and method for producing the same |
| GB201521579D0 (en) * | 2015-12-08 | 2016-01-20 | Rolls Royce Plc | An induction motor rotor and a method of manufacturing the same |
| EP3540923A1 (en) * | 2018-03-12 | 2019-09-18 | Siemens Aktiengesellschaft | Method for producing a squirrel-cage rotor |
| CN111987825A (en) * | 2020-09-03 | 2020-11-24 | 长沙开湖设备有限公司 | Squirrel-cage rotor adapting to skin effect to improve conducting capacity of conducting bar |
-
2021
- 2021-07-06 CN CN202110762712.7A patent/CN113691085B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103887934A (en) * | 2014-04-24 | 2014-06-25 | 洛阳轴研科技股份有限公司 | Finishing method of electric spindle squirrel cage rotor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113691085A (en) | 2021-11-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6856063B1 (en) | Electromotive devices using notched ribbon windings | |
| US11451121B2 (en) | Method for producing a material layer and a material layer structure for a dynamoelectric rotary machine | |
| KR100489674B1 (en) | Stator core for a magnetic bearing and the method of manufacturing it | |
| US9083221B2 (en) | Rotor assembly with integral cast conductor bars and first end rings and welded second end rings and method of manufacturing same | |
| EP2804297B1 (en) | Squirrel-cage rotor assembly with electron beam welded end caps | |
| CN113691085B (en) | Manufacturing method of squirrel cage assembly and squirrel cage assembly | |
| US8653713B2 (en) | Magnetic circuit structure | |
| US11496014B2 (en) | Winding head arrangement for an electric rotating machine | |
| EP2779373B1 (en) | Rotating machine with magnetic bearing | |
| CN111418131B (en) | Stator core | |
| CN216414143U (en) | Rotor end ring and squirrel cage assembly | |
| JP2015162913A (en) | Induction motor and manufacturing method of rotor thereof | |
| CN113691040B (en) | Motor rotor and manufacturing method | |
| JP6094395B2 (en) | Rotating electrical machine rotor | |
| EP3916963A1 (en) | Conformal cooling devices for rotating generator elements and additive manufacturing processes for fabricating the same | |
| EP1014545B1 (en) | Electromagnetic retarder with a built-in exciter | |
| JP2020171096A (en) | Stator | |
| CN115203837A (en) | Optimal design calculation method for motor size chain | |
| JP2019022425A (en) | Stator core, manufacturing apparatus for stator core, manufacturing method for stator core, electric motor and blower | |
| CN114651387A (en) | Method for manufacturing stator of rotating electric machine, and rotating electric machine | |
| EP2793375B1 (en) | A stator for an electrical machine of a mobile working machine | |
| US20020135258A1 (en) | Laminated rotor for eddy-current brake and device including such a rotor | |
| JP3181610U (en) | Mounting member and motor | |
| JP6202863B2 (en) | Induction motor manufacturing method | |
| CN111864925B (en) | Method and apparatus for manufacturing split type core of stator core |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |