CN113675969B - Motor shaft assembly and manufacturing method of motor rotating shaft - Google Patents
Motor shaft assembly and manufacturing method of motor rotating shaft Download PDFInfo
- Publication number
- CN113675969B CN113675969B CN202110762815.3A CN202110762815A CN113675969B CN 113675969 B CN113675969 B CN 113675969B CN 202110762815 A CN202110762815 A CN 202110762815A CN 113675969 B CN113675969 B CN 113675969B
- Authority
- CN
- China
- Prior art keywords
- motor shaft
- motor
- cavity
- mounting
- rotor core
- 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
- 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
-
- 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
- H02K15/14—Casings; Enclosures; Supports
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/003—Couplings; Details of shafts
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
Abstract
The invention provides a motor shaft assembly, and relates to the field of electric appliances. The motor shaft assembly includes: a rotor core; the motor rotating shaft is connected with the rotor core; wherein, the motor pivot includes: the mounting part extends along the first direction, a cavity is formed in the mounting part, and the rotor core is sleeved on at least part of the mounting part; the transmission part is arranged at the end part of the mounting part and extends along the first direction; in the section perpendicular to the first direction, the outer edge dimension of the mounting portion is larger than the outer edge dimension of the transmission portion, and the ratio of the outer edge dimension of the mounting portion to the outer edge dimension of the transmission portion is larger than a preset value. Such motor shaft assemblies have a relatively light weight. The invention also provides a manufacturing method of the motor rotating shaft, which comprises the following steps: and the integrally formed motor rotating shaft is obtained through additive manufacturing.
Description
Technical Field
The invention relates to the field of electric appliances, in particular to a motor shaft assembly and a manufacturing method of a motor rotating shaft.
Background
A motor is a device for converting electric energy into kinetic energy by an electromagnetic induction principle, and generally, the motor includes a stator and a rotor, wherein the stator provides a varying magnetic field to generate an induction current in the rotor and drive the rotor to rotate along with the variation of the magnetic field. Related motors typically have a motor shaft assembly including a rotor core and a motor shaft, which is heavy, resulting in a motor having a heavy overall weight.
Disclosure of Invention
The invention provides a motor shaft assembly and a manufacturing method of a motor rotating shaft, which are used for solving the technical problem of reducing the weight of the motor shaft assembly and thus reducing the overall weight of the motor.
An embodiment of the present invention provides a motor shaft assembly including: a rotor core; the motor rotating shaft is connected with the rotor core; wherein, the motor shaft includes: the mounting part extends along a first direction, and the rotor core is sleeved on at least part of the mounting part; the transmission part is arranged at the end part of the installation part and extends along the first direction, and a cavity is arranged in the installation part; in the section perpendicular to the first direction, the outer edge dimension of the mounting part is larger than the outer edge dimension of the transmission part, and the ratio of the outer edge dimension of the mounting part to the outer edge dimension of the transmission part is larger than a preset value.
Further, the preset value is 1.5.
Further, the cavity is arranged in the transmission part.
Further, the cavity in the mounting portion and the cavity in the transmission portion both extend in the first direction.
Further, in a cross section perpendicular to the first direction, an outer edge dimension of the cavity in the mounting portion is larger than an outer edge dimension of the cavity in the transmission portion.
Further, at least one of the cavity in the mounting portion and the cavity in the transmission portion comprises a closed cavity.
Further, the mounting portion includes: the rotor core is sleeved on the sleeved part, and the transmission part is arranged at the end part of the sleeved part; the positioning part extends out of the circumferential outer surface of the sleeving part along the second direction and is abutted with one end of the rotor core; wherein the second direction is substantially perpendicular to the first direction.
Further, the distance that the positioning portion stretches out from the circumferential outer surface of the sleeving portion is larger than a preset threshold value.
Further, a heat dissipation air duct is arranged on the outer surface of the mounting portion, and the length direction of the heat dissipation air duct is basically parallel to the first direction.
Further, fan blades are arranged in the heat dissipation air duct.
The embodiment of the invention also provides a manufacturing method of the motor rotating shaft, which is used for manufacturing the motor rotating shaft in the motor shaft assembly, and comprises the following steps: and the integrally formed motor rotating shaft is obtained through additive manufacturing.
An embodiment of the present invention provides a motor shaft assembly including: the motor rotating shaft comprises a transmission part and a mounting part, wherein the transmission part and the mounting part extend along a first direction, a cavity is formed in the mounting part, the rotor core is sleeved on the mounting part of at least part, the outer edge size of the mounting part is larger than the outer edge size of the transmission part in a section perpendicular to the first direction, and the ratio of the outer edge size of the mounting part to the outer edge size of the transmission part is larger than a preset value, namely, the outer edge size of the mounting part is far larger than the outer edge size of the transmission part. Through setting the outer fringe size of installation department to great size to locate the installation department with rotor core cover, simultaneously, set up the cavity in the inside of installation department, can understand as the inside structure integration in motor shaft's installation department with a part of rotor core, and replace the inside solid structure of rotor core with the structure that has the cavity, thereby reduced the weight of motor shaft subassembly, and then reduced the whole weight of the motor that has adopted this motor shaft subassembly.
Drawings
FIG. 1 is a schematic view of a motor shaft assembly according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view of a motor shaft in a motor shaft assembly according to an embodiment of the present invention;
FIG. 3 is a schematic view of a motor shaft in a motor shaft assembly according to an embodiment of the present invention;
fig. 4 is a flow chart of a method for manufacturing a motor shaft according to an embodiment of the invention.
Reference numerals illustrate:
1. a motor shaft assembly; 10. a rotor core; 20. a motor shaft; 21. a mounting part; 211. a sleeving part; 212. A positioning part; 213. a heat dissipation air duct; 22. a transmission part; 23. a cavity; 24. reinforcing ribs; 25. and a bearing sealing part.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
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 particular embodiments, the motor shaft assembly may be adapted for use with any type of motor, for example, the motor shaft assembly may be adapted for use with synchronous motors, asynchronous motors, or stepper motors. In the following, the structure of the motor shaft assembly is exemplified by the motor shaft assembly being suitable for a squirrel-cage asynchronous motor, and the type of the motor does not affect the structure of the motor shaft assembly.
In some embodiments, as shown in fig. 1, a motor shaft assembly 1 includes: rotor core 10 and motor shaft 20. The rotor core 10 is made of a metallic material having high saturation induction intensity to increase the intensity of electromagnetic induction, and is made of a silicon steel sheet. The motor shaft 20 is connected with the rotor core 10 to support the rotor core 10, specifically, the motor shaft assembly 1 further comprises a housing, the housing encloses and forms a containing cavity, the rotor core 10 and a part of the motor shaft 20 are located in the containing cavity, two ends of the motor shaft 20 are rotatably connected with the housing, the rotor core 10 is sleeved outside the motor shaft 20, meanwhile, the motor shaft 20 is further connected with a rotating part of the rotor, and a part of the motor shaft 20 extends out of the housing and is used for being connected with other devices needing to be driven to output kinetic energy of the motor shaft assembly 1.
Wherein the motor shaft 20 includes a mounting portion 21 and a transmission portion 22. The mounting portion 21 extends in a first direction (the first direction is indicated by an arrow in fig. 1), and a cavity 23 is provided inside the mounting portion 21. The rotor core 10 is sleeved on at least part of the mounting portion 21, specifically, the rotor core 10 is provided with a mounting through hole, and at least part of the mounting portion 21 is located in the mounting through hole. The transmission part 22 is disposed at an end of the mounting part 21 and extends along the first direction, and the transmission part 22 is used for extending out of the housing of the motor shaft assembly 1 and connecting with other devices to be driven so as to drive the other devices.
In a cross section perpendicular to the first direction, the outer edge dimension of the mounting portion 21 is larger than the outer edge dimension of the transmission portion 22, and the ratio of the outer edge dimension of the mounting portion 21 to the outer edge dimension of the transmission portion 22 is larger than a preset value, i.e., in a cross section perpendicular to the first direction, the outer edge dimension of the mounting portion 21 is much larger than the outer edge dimension of the transmission portion 22, for example, the preset value is 2, it being understood that the outer edge dimension of the mounting portion 21 is at least 2 times the outer edge dimension of the transmission portion 22. For convenience of explanation, the design concept of the motor shaft 20 and the advantageous effects thereof will be described by taking the mounting portion 21 and the transmission portion 22 as circular axes as examples, and the outer edge dimension of the mounting portion 21 and the outer edge dimension of the transmission portion 22 will be referred to as the shaft diameter of the mounting portion 21 and the shaft diameter of the transmission portion 22, respectively, in a section perpendicular to the first direction.
The following describes the design concept of the motor shaft 20 provided in the present embodiment. The motor shaft 20 provided in this embodiment is integrally manufactured by additive manufacturing, rather than by cutting or welding, and for the structure of the motor shaft 20 provided in this embodiment in which the shaft diameter of one portion is far greater than that of the other portion, if the cutting or welding method is adopted, the economical efficiency is poor, and the structure is not suitable. Specifically, the motor shaft 20 is obtained by cutting, it is necessary to manufacture a blank having a shaft diameter not smaller than that of the mounting portion 21, and cut the shaft diameter of the portion of the blank corresponding to the transmission portion 22 by cutting from not smaller than that of the mounting portion 21 to slightly larger than or equal to that of the mounting portion 21, and a large amount of metal material is consumed in the cutting process, and at the same time, since the cutting amount is large, in order to prevent the tool from overheating or being broken in the cutting process, it is necessary to process the transmission portion 22 by cutting a plurality of times, and the processing process is complicated and time-consuming and laborious. The installation department 21 and the drive part 22 are processed respectively to install installation department 21 and drive part 22 as an organic whole through the welding, although can reduce the cutting amount of cutting, can leave the welding seam in the welding department, also have the quality risk increase problem that leads to because the deformation or the stress concentration that the welding arouses simultaneously, the wholeness of motor pivot 20 is not good, and in the rotatory in-process of motor pivot 20, the stress that motor pivot 20 received can concentrate in welding seam department, leads to motor pivot 20's life to reduce. The possibility of the occurrence of the problems can be reduced through additive manufacturing, specifically, the integral motor rotating shaft structure is obtained according to the actual size requirement of each part of the motor rotating shaft 20, the cutting amount of materials can be reduced, meanwhile, the obtained motor rotating shaft 20 is high in structural integrity, the phenomenon of stress concentration can be relieved when the motor rotating shaft is stressed, and the service life of the motor rotating shaft 20 is prolonged. In summary, in the case that the motor shaft is manufactured by a cutting process or a welding process, and it is not thought that the motor shaft 20 can be manufactured by additive manufacturing, a person skilled in the art will not design the motor shaft as the structure of the motor shaft 20 provided in the present embodiment. The specific method for obtaining the motor shaft 20 through additive manufacturing is described in other embodiments, and is not described herein.
The advantageous effects of the motor shaft assembly 1 to which the motor shaft 20 is applied will be described below. The shaft diameter of the mounting portion 21 is larger, and the inside of the mounting portion 21 is provided with a cavity, so that the rotor core 10 is sleeved outside the mounting portion 21 with the larger shaft diameter, which is equivalent to replacing the solid portion of the rotor core 10 with a structure with the cavity, thereby reducing the weight of the motor shaft assembly 1 and further reducing the weight of the motor applying the motor shaft assembly 1. Specifically, an installation through hole is provided in the rotor core 10, and at least a portion of the installation portion 21 is located in the installation through hole, so that the rotor core 10 is sleeved on the installation portion 21. Through setting the diameter of the mounting portion 21 to be larger, the aperture of the mounting through hole of the rotor core 10 can be increased, meanwhile, the cavity 23 is arranged in the mounting portion 21, and it can be understood that a part of the solid structure inside the rotor core 10 is integrated in the mounting portion 21 of the motor rotating shaft 20, and the part of the solid structure is replaced by a structure with the cavity, so that the weight of the motor shaft assembly 1 is reduced, and the overall weight of the motor adopting the motor shaft assembly 1 is reduced. It should be noted that only a part of the structure near the outer surface of the rotor core 10 participates in electromagnetic induction, and is used for enhancing the strength of electromagnetic induction, while the internal structure of the rotor core 10 does not participate in electromagnetic induction, the internal structure of the rotor core 10 is integrated in the mounting portion 21 of the motor shaft 20, and the material of the part is replaced by a structure with a cavity from the solid structure, so that the quality of the motor shaft assembly machine 1 can be reduced without affecting the strength of electromagnetic induction of the motor shaft assembly 1. An embodiment of the present invention provides a motor shaft assembly including: the motor rotating shaft comprises a transmission part and a mounting part, wherein the transmission part and the mounting part extend along a first direction, a cavity is formed in the mounting part, the rotor core is sleeved on the mounting part of at least part, the outer edge size of the mounting part is larger than the outer edge size of the transmission part in a section perpendicular to the first direction, and the ratio between the outer edge size of the mounting part and the outer edge size of the transmission part is larger than a preset value, namely, the outer edge size of the mounting part is far larger than the outer edge size of the transmission part. Through setting the outer fringe size of installation department to great size to locate the installation department with rotor core cover, simultaneously, set up the cavity in the inside of installation department, can understand as the inside structure integration in motor shaft's installation department with a part of rotor core, and replace the inside solid structure of rotor core with the structure that has the cavity, thereby reduced the weight of motor shaft subassembly, and then reduced the whole weight of the motor that has adopted this motor shaft subassembly.
In some embodiments, as shown in fig. 1, in a cross section perpendicular to the first direction, a ratio of an outer edge dimension of the mounting portion 21 to an outer edge dimension of the transmission portion 22 is greater than a preset value, and the preset value is not less than 1.5, that is, in a cross section perpendicular to the first direction, the outer edge dimension of the mounting portion 21 is at least 1.5 times as large as the outer edge dimension of the transmission portion 22, and, illustratively, in a cross section perpendicular to the first direction, the outer edge dimension of the transmission portion 22 is 100 millimeters, and then the outer edge dimension of the mounting portion 21 is not less than 150 millimeters.
In some embodiments, as shown in fig. 2, a cavity 23 is provided in the mounting portion 21, and by providing the cavity 23 in the transmission portion 22, the weight of the motor shaft 20 is further reduced, thereby further reducing the weight of the motor shaft assembly 1. Optionally, the volume of the cavity 23 provided in the transmission part 22 is smaller than the volume of the cavity 23 provided in the mounting part 21, that is, the inner space of the mounting part 21 is fully utilized, and the cavity with a larger volume is provided in the mounting part 21 with a larger volume, thereby further reducing the overall weight of the motor shaft assembly 1. It should be noted that the cavities 23 in the mounting portion 21 and the transmission portion 22 may be provided in any form, for example, the cavities 23 in the mounting portion 21 and the transmission portion 22 may be provided at intervals along the first direction, for example, the cavities 23 in the mounting portion 21 and the transmission portion 22 may also extend along the first direction and communicate with each other. The size of the cavity in the transmission part 22 is also determined according to the strength of the transmission part 22, so that the transmission part 22 does not break or deform while transmitting the torque.
Optionally, the end of the transmission part 22 is provided with the cavity 23, after the integrally formed motor shaft 20 is manufactured by additive manufacturing, the motor shaft 20 can be fixed on a processing machine through the cavity 23 arranged at the end of the transmission part 22, and the motor shaft 20 is further processed. For example, after the integrally formed motor shaft 20 is manufactured by additive manufacturing, the outer surface of the mounting portion 21 needs to be further processed by grinding, so that in the case that the dimensional accuracy and the surface roughness of the outer surface of the mounting portion 21 meet the design requirements, one end of the motor shaft 20 can be clamped by the clamping jaw of the grinding machine, and the ejector rod of the grinding machine is pushed against the cavity 23 of the end face of the transmission portion 22, thereby fixing the motor shaft 20 to the grinding machine.
In some embodiments, as shown in fig. 2, the cavities 23 within the mounting portion 21 and the transmission portion 22 each extend in a first direction (the first direction being indicated by the arrow in fig. 2), i.e., such that the direction of extension of the cavities 23 is the same as the direction of extension of the mounting portion 21 and the direction of extension of the transmission portion 22. By setting the extending direction of the cavity 23 to be the same as the length direction of the mounting portion 21 and the transmission portion 22, the structure of the motor shaft 20 is simplified, the manufacturing difficulty of the motor shaft 20 is reduced, the weight of each part of the mounting portion 21 in the first direction is the same, the weight of each part of the transmission portion 22 in the first direction is the same, and the dynamic unbalance of the motor shaft 20 in rotation is reduced, so that the vibration and noise generated in the rotation process of the motor shaft assembly 1 are reduced, and the service life of the motor shaft 20 is prolonged. Optionally, as shown in fig. 2, the mass center axis of the cavity 23 in the mounting portion 21 coincides with the mass center axis of the mounting portion 21, and the mass center axis of the cavity 23 in the transmission portion 22 coincides with the mass center axis of the transmission portion 22, so as to further reduce the dynamic unbalance degree of the motor shaft 20 in the rotating process, thereby reducing the vibration and noise generated by the motor shaft assembly 1 in the rotating process, and further prolonging the service life of the motor shaft 20.
In some embodiments, as shown in fig. 2, in a cross section perpendicular to the first direction, the outer edge dimension of the cavity 23 in the mounting portion 21 is larger than the outer edge dimension of the cavity in the driving portion 22, that is, in the case that the cavity 23 extends in the first direction (the first direction is shown by an arrow in fig. 2), the cross section of the cavity in the mounting portion 21 is set to be larger than the cross section of the cavity 23 in the driving portion 22, so that the inner space of the mounting portion 21 having a larger dimension is fully utilized in the case that the dynamic unbalance of the motor shaft 20 is reduced, thereby further reducing the weight of the motor shaft 20 and further reducing the weight of the motor shaft assembly 1.
In some embodiments, as shown in fig. 2, at least one of the cavities 23 in the mounting portion 21 and the transmission portion 22 is a closed cavity, wherein the closed cavity is completely located inside the mounting portion 21 or the transmission portion 22 and is not communicated with the outer space of the motor shaft 20, so that dust or liquid in the outer space of the motor shaft 20 is reduced from entering the closed cavity while the cavity is arranged in the motor shaft 20, thereby reducing the possibility of corrosion of the inside of the motor shaft 20 and further prolonging the service life of the motor shaft 20. Optionally, the cavities 23 in the mounting portion 21 and the driving portion 22 are closed cavities. It should be noted that, through the cutting process or the casting process, a closed cavity cannot be provided in the mounting portion 21 and the transmission portion 22 of the integrally formed motor shaft 20, specifically, through the cutting process, a cavity communicated with the external space of the motor shaft 20 needs to be obtained in the motor shaft 20 through the cutting process, then, through means such as welding or splicing, the opening of the cavity is closed by using a closing element, the processing steps are complex, and the integral forming of the motor shaft 20 cannot be realized, the integrity of the motor shaft 20 is poor, stress concentration is easily formed at the splicing position such as a welding seam, so that the service life of the motor shaft 20 is shortened, and after the motor shaft 20 with the closed cavity is obtained through casting, the core cannot be taken out from the motor shaft 20. The above problems can be overcome by additive manufacturing, and the motor shaft 20 can be directly processed to obtain the motor shaft 20 with a closed cavity while integrally forming the motor shaft 20, so that a person skilled in the art cannot set the closed cavity in the mounting portion 21 and the transmission portion 22 of the motor shaft 20 on the premise of integrally forming the motor shaft 20 by additive manufacturing through cutting or casting.
Optionally, referring to fig. 1 and 2, a reinforcing rib 24 is disposed on a wall surface of the mounting portion 21 and/or the driving portion 22 adjacent to the cavity 23, and the reinforcing rib 24 extends from the wall surface toward the interior of the cavity 23, so that the structural strength of the motor shaft 20 is improved and the service life of the motor shaft 20 is further prolonged without affecting the shape of the outer surface of the motor shaft 20. Optionally, the reinforcing ribs 24 extend along the first direction, and the reinforcing ribs 24 are plural and are disposed in the cavity 23 at intervals around the first direction, so that the strength of the motor shaft 20 is further increased, and the service life of the motor shaft 20 is prolonged. It should be noted that, on the premise that those skilled in the art do not contemplate that the motor shaft 20 with the closed cavity may be manufactured by additive manufacturing in one piece, those skilled in the art do not contemplate providing the reinforcing ribs 24 in the closed cavity.
In some embodiments, as shown in fig. 3, the mounting portion 21 includes: a fitting portion 211 and a positioning portion 212. The rotor core 10 in fig. 1 is sleeved on the sleeved part, and the transmission part 22 is arranged at the end part of the sleeved part 211, alternatively, the transmission part 22 can be arranged at one end of the sleeved part 211 or at two ends of the sleeved part 211. The positioning portion 212 protrudes from the circumferential outer surface of the fitting portion 211 in the second direction (the second direction is indicated by a dashed arrow in fig. 3), wherein the axial outer surface of the positioning portion 212 may be a non-end outer surface of the positioning portion 212, and after the rotor core 10 is fitted to the fitting portion 211, the positioning portion 212 may abut against one end surface of the rotor core 10 in the first direction (the first direction is indicated by a solid arrow in fig. 3), thereby restricting movement of the rotor core 10 relative to the fitting portion 211 in the first direction. Wherein the second direction is substantially perpendicular to the first direction, that is, the positioning portion 212 extends along an outer surface substantially perpendicular to the nesting portion 211, so that a dimension of the positioning portion 212 perpendicular to the nesting portion 211 is fully utilized, a contact area between the positioning portion 212 and the rotor core 10 is increased, and thus a movement of the rotor core 10 relative to the nesting portion 211 along the first direction is more reliably limited, the second direction and the first direction are substantially perpendicular, it is understood that an included angle between the first direction and the second direction is allowed due to a manufacturing error, and a difference between the included angle between the first direction and the second direction and 90 degrees is small and a preset angle, for example, the preset angle is 5 degrees, and then the included angle between the first direction and the second direction is between 85 degrees and 95 degrees. It should be noted that only one positioning portion 212 is provided on the circumferential outer surface of the fitting portion 211, that is, the fitting portion 211 is only used to abut against one side of the rotor core 10 in the first direction, so as to limit the movement of one side of the rotor core 10 in the first direction, and the assembly between the rotor core 10 and the fitting portion 211 is not affected.
In some embodiments, as shown in fig. 3, the distance that the positioning portion 212 protrudes from the circumferential outer surface of the sleeve portion 211 is greater than a preset threshold, that is, in a cross section perpendicular to the first direction, the outer edge dimension of the positioning portion 212 is much greater than the outer edge dimension of the sleeve portion 211, so as to increase the contact area between the end surface of the rotor core 10 in the first direction and the positioning portion 212 in fig. 1, and further more reliably limit the movement of the rotor core 10 in the first direction relative to the motor shaft 20, where the preset threshold may be, for example, half the outer edge dimension of the rotor core 10, so as to limit the movement of the rotor core 10 in the first direction. It should be noted that, in the structure of the mounting portion 21 in which the outer edge dimension of the positioning portion 212 is significantly larger than the outer edge dimension of the fitted portion 211 is difficult to be formed by cutting or welding, specifically, the mounting portion 21 of the motor shaft 20 is obtained by cutting, it is necessary to manufacture a blank having a shaft diameter not smaller than the shaft diameter of the positioning portion 212, and to cut the portion of the blank corresponding to the fitted portion 211 by cutting to a shaft diameter not smaller than the shaft diameter of the positioning portion 212 to a value slightly larger than or equal to the shaft diameter of the fitted portion 211, a large amount of metal material is lost during cutting, and at the same time, since the cutting amount is large, in order to prevent overheating of the tool or breakage of the tool during cutting, it is necessary to process the fitted portion 211 by cutting a plurality of times, and the processing is complicated and time-consuming and labor-consuming. The sleeve part 211 and the positioning part 212 of the mounting part 21 are respectively processed, then the sleeve part 211 is fixedly connected with the positioning part 212 by welding, a welding seam is generated between the sleeve part 211 and the positioning part 212, the integrity of the mounting part 21 is poor, and stress on the mounting part 21 of the motor rotating shaft 20 can generate stress concentration at the welding seam, so that the service life of the motor rotating shaft 20 is shortened. The positioning portion 212 is integrally formed by additive manufacturing, so that the above problems occurring when the positioning portion 212 is manufactured by cutting or welding can be overcome, and in summary, the person skilled in the art will not design the mounting portion 21 of the motor shaft as the structure of the mounting portion 21 provided in the present embodiment on the premise that the person skilled in the art manufactures the mounting portion 21 of the motor shaft 20 by cutting or welding, and does not think that the mounting portion 21 of the motor shaft 20 can be obtained by integral forming by additive manufacturing.
In some embodiments, as shown in fig. 3, a heat dissipation air duct 213 is disposed on an outer surface of the mounting portion 21, a length direction of the heat dissipation air duct 213 is substantially parallel to a first direction (the first direction is shown by a solid arrow in fig. 3), after the rotor core 10 in fig. 1 is sleeved on the mounting portion 21, an air flow flowing in the heat dissipation air duct 213 can cool the rotor core 10, so that a possibility of damage of the rotor core 10 due to overheating is reduced, a service life of the rotor core 10 is prolonged, and meanwhile, compared with a heat dissipation scheme in which heat dissipation holes are disposed in a related motor shaft assembly, the weight of the motor shaft 20 is further reduced by disposing the heat dissipation air duct 213. The length direction of the heat dissipation air channel 213 may be a direction of the heat dissipation air channel 213 having a maximum size, and the length direction of the heat dissipation air channel 213 is substantially parallel to the first direction, which may be understood as allowing an included angle between the length direction of the heat dissipation air channel 213 and the first direction due to a manufacturing error, and the included angle between the length direction of the heat dissipation air channel 213 and the first direction is smaller than a preset angle, which may be 5 degrees.
Optionally, as shown in fig. 3, the heat dissipation air duct 213 penetrates through two end surfaces of the positioning portion 212 along the first direction, so as to extend the length of the heat dissipation air duct 213, further enhance the heat dissipation effect of the heat dissipation air duct on the rotor core 10, improve the integration degree of the positioning portion 212 and the mounting portion 21, and improve the overall strength of the motor shaft, so as to further extend the service life of the rotor core 10. It should be noted that, the structure that the heat dissipation air duct 213 penetrates through the two end surfaces of the positioning portion along the first direction is difficult to be achieved through cutting, specifically, the heat dissipation air duct 213 penetrates through the positioning portion 212 through cutting, and a through-hole penetrating through the two end surfaces of the positioning portion 212 along the first direction needs to be formed in the positioning portion 212 so that a cutting tool penetrates through the positioning portion 212, so that manufacturing difficulty of the positioning portion 212 is increased, structural strength of the positioning portion 212 is reduced, and reliability of the positioning portion 212 in limiting movement of the rotor core 10 relative to the sleeve portion 211 along the first direction is reduced. And respectively process the locating part 212 and the cover portion 211 that establishes with the heat dissipation wind channel 213 to fix the locating part 212 in the circumference external surface of cover portion 211 through the welding, not only reduced the wholeness of installation department 21, can produce stress concentration in the welding seam department of establishing between portion 211 and the locating part 212, reduced the life of installation department 21, simultaneously, owing to cover portion 211 is provided with the heat dissipation wind channel 213, the area of contact between portion 211 and the locating part 212 is less, has reduced the length of cover portion 211 and locating part 212, thereby reduced the fixed force between cover portion 211 and the locating part 212, further reduced the overall structure intensity of installation department 21. The mounting portion 21 of the motor shaft 20 with the heat dissipation air duct 213 penetrating the positioning portion 212 is integrally formed by additive manufacturing, so that the problems occurring during the cutting or welding process can be overcome. In summary, on the premise that the person skilled in the art manufactures the mounting portion 21 of the motor shaft 20 by cutting or welding, and does not think that the mounting portion 21 of the motor shaft 20 can be obtained by additive manufacturing integrated molding, the person skilled in the art does not design the mounting portion of the motor shaft as the structure of the mounting portion 21 provided in the present embodiment.
In some embodiments, the cooling air channels 213 are formed by spaced cooling ribs around the outer surface of the sleeve 211, such that the cooling ribs carry air flow during high speed rotation following the motor shaft 2, thereby cooling the squirrel cage assembly 1. In other embodiments, the fan blades are disposed inside the heat dissipation air channel 213, and during the rotation of the motor shaft 20, the fan blades also rotate together and drive the air to move along the length direction of the heat dissipation air channel 213, so that the air is driven to move along the length direction of the heat dissipation air channel 213 and cool the rotor core in fig. 1 without additional air driving devices. Optionally, the fan blades are disposed on a side opposite to the side of the positioning portion 212 on which the rotor core 10 is disposed, so that the heat dissipation effect on the rotor core 10 is further enhanced without reducing the length of the portion of the heat dissipation air duct 213 that contacts the rotor core 10.
In some embodiments, the motor shaft 20 further includes a counterweight mounting structure for mounting a dynamic counterweight at a corresponding position, so as to reduce dynamic unbalance of the motor shaft 20, further reduce noise and vibration generated during the rotation process of the motor shaft 20, and prolong the service life of the motor shaft 20. The weight mounting structure may be any structure capable of mounting a dynamic weight, for example, the weight mounting structure may be a threaded hole to which the dynamic weight is fixed by a bolt, so that the dynamic weight is fixed to the motor shaft 20. Meanwhile, the weight mounting structure may be provided at any position where the rotational inertia of the motor shaft 20 can be adjusted, for example, the dynamic balance mounting structure may be provided at the surface of the positioning portion 212. Optionally, the motor shaft 20 is further provided with a transmission key, where the transmission key is used to fix the accessories of the motor shaft assembly 1 that needs to be driven by the motor shaft 20 with the circumferential direction of the motor shaft 20, so that the motor shaft 20 can drive the accessories to rotate together, and the transmission key is further used to fix the rotor core 10 with the motor shaft 20 with the circumferential direction, so that the rotor of the motor can drive the motor shaft 20 to rotate together, and the transmission key is integrally formed in the motor shaft 20 through additive manufacturing, and has a larger structural strength and can transmit a larger torque.
In some embodiments, as shown in fig. 3, bearing sealing portions 25 are further disposed at both ends of the mounting portion 21, specifically, a transmission portion 22 is disposed at both ends of the mounting portion 21 in the first direction, the transmission portion 22 is rotatably connected with the housing of the motor, and a bearing is disposed between the transmission portion 22 and the housing of the motor 1. The bearings are lubricated with grease, and the two bearings are respectively abutted against the bearing sealing portions 25 at both ends of the mounting portion 21, so that the loss of grease in the bearings is reduced, and the wear of the bearings is reduced. Optionally, the bearing sealing portion 25 is a labyrinth sealing ring, specifically, an end surface of the labyrinth sealing ring, which is used for being abutted to a bearing, is provided with a plurality of annular sealing teeth which are sequentially arranged, a series of interception gaps and expansion cavities are formed between the teeth, and a throttling effect is generated when a sealed medium passes through the gaps of the tortuous labyrinth to prevent grease from being lost. It should be noted that, the bearing sealing portion 25 is integrated in the portion of the motor shaft 20 during the process of manufacturing the motor shaft 20 by integrally forming the additive manufacturing, so that the integrity of the motor shaft 20 is further increased, and the structural strength of the motor shaft 20 is further increased.
The embodiment of the invention also provides a manufacturing method of the motor rotating shaft, and the motor rotating shaft is the motor rotating shaft in the motor shaft assembly 1 shown in any one of figures 1 to 3. The manufacturing method comprises the following steps: and the integrally formed motor rotating shaft is obtained through additive manufacturing. 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 performed by any one of a fused deposition modeling method, a selective laser sintering method, a stereolithography method, an electron beam sintering method, and the like. The following describes an exemplary process of obtaining an integrally molded motor shaft by additive manufacturing using the additive manufacturing as a selective laser sintering method. As shown in fig. 4, the process of the method for manufacturing a motor shaft provided by the invention mainly includes:
step S101, spraying metal powder with preset thickness on a bearing base surface, and sintering the technical powder into a first cross-section layer with a corresponding shape through laser according to the structure of a motor rotating shaft.
Specifically, in the design process, according to the thickness of the section layer formed by sintering each time by a laser sintering method, the motor rotating shaft is divided into a plurality of continuous design section layers along the length direction of the motor rotating shaft, a first design section layer is determined according to the manufacturing sequence of each design section layer, and metal powder is sintered into a first section layer consistent with the shape of the first design section layer by laser. For example, if each cross-sectional layer of the motor shaft is sequentially manufactured from a first end of the motor rotor to a second end opposite to the first end in the first direction, the cross-sectional layer including the first end, or the cross-sectional layer closest to the first end, is determined as the first cross-sectional layer. It should be noted that, the design section layer is a virtual structure into which the model of the motor shaft is cut in the design process, and the virtual structure is a manufacturing target in the additive manufacturing process, not an actual structure.
Step S102, spraying metal powder on the first cross-section layer and sintering to sequentially form additional cross-section layers, so that the first cross-section layer and each additional cross-section layer are solidified to form the motor rotating shaft.
Optionally, each section layer of the motor shaft is sequentially manufactured from a first end of the motor rotor to a second end opposite to the first end along the first direction, and each adjacent section layer is sequentially sintered into a motor shaft with a shape consistent with that of the required motor shaft, so that the integrally formed motor shaft is obtained.
Optionally, after each sintering to form one cross-sectional layer, the cross-sectional layer is cleaned of excess metal powder, and after the excess powder is cleaned, the next cross-sectional layer is manufactured to prevent the excess metal powder from affecting the manufacture of the cross-sectional layer at a time.
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 (8)
1. A motor shaft assembly, comprising:
a rotor core;
the motor rotating shaft is connected with the rotor core;
wherein, the motor shaft includes:
the mounting part extends along a first direction, a cavity is formed in the mounting part, the rotor core is sleeved on the outer surface of at least part of the mounting part, and the first direction is the axial direction of the mounting part;
the transmission part is arranged at the end part of the mounting part and extends along the first direction, the cavity is arranged in the transmission part, and the first direction is the axial direction of the transmission part;
in a section perpendicular to the first direction, the outer edge dimension of the mounting part is larger than the outer edge dimension of the transmission part, and the ratio of the outer edge dimension of the mounting part to the outer edge dimension of the transmission part is larger than a preset value, wherein the preset value is 1.5;
at least one of the cavity in the mounting part and the cavity in the transmission part comprises a closed cavity, and the motor rotating shaft is integrally formed through additive manufacturing.
2. The motor shaft assembly of claim 1, wherein the cavity in the mounting portion and the cavity in the transmission portion each extend in the first direction.
3. The motor shaft assembly of claim 2, wherein an outer edge dimension of the cavity in the mounting portion is greater than an outer edge dimension of the cavity in the transmission portion in a cross-section perpendicular to the first direction.
4. The motor shaft assembly of claim 1, wherein the mounting portion comprises:
the rotor core is sleeved on the sleeved part, and the transmission part is arranged at the end part of the sleeved part;
the positioning part extends out of the circumferential outer surface of the sleeving part along the second direction and is abutted with one end of the rotor core; wherein the second direction is substantially perpendicular to the first direction.
5. The motor shaft assembly as claimed in claim 4, wherein the positioning portion protrudes from the circumferential outer surface of the sleeve portion by a distance greater than a preset threshold.
6. The motor shaft assembly of claim 1, wherein the outer surface of the mounting portion is provided with a heat dissipation air duct, and wherein a length direction of the heat dissipation air duct is substantially parallel to the first direction.
7. The motor shaft assembly of claim 6, wherein fan blades are disposed within the heat dissipation air duct.
8. A method of manufacturing a motor shaft, characterized in that the method is used for manufacturing a motor shaft in a motor shaft assembly according to any one of claims 1 to 7, the method comprising: and the integrally formed motor rotating shaft is obtained through additive manufacturing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110762815.3A CN113675969B (en) | 2021-07-06 | 2021-07-06 | Motor shaft assembly and manufacturing method of motor rotating shaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110762815.3A CN113675969B (en) | 2021-07-06 | 2021-07-06 | Motor shaft assembly and manufacturing method of motor rotating shaft |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113675969A CN113675969A (en) | 2021-11-19 |
| CN113675969B true CN113675969B (en) | 2023-07-21 |
Family
ID=78538607
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110762815.3A Active CN113675969B (en) | 2021-07-06 | 2021-07-06 | Motor shaft assembly and manufacturing method of motor rotating shaft |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113675969B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110474498A (en) * | 2018-05-10 | 2019-11-19 | 通用电气航空系统有限责任公司 | The component of the increasing material manufacturing of motor |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7098569B2 (en) * | 2004-07-30 | 2006-08-29 | Ballard Power Systems Corporation | Rotor assembly for a permanent magnet power electric machine |
| US20140097711A1 (en) * | 2012-10-05 | 2014-04-10 | Larry Kubes | One piece rotor hub/shaft for an electric machine and method |
| US20170063183A1 (en) * | 2015-08-29 | 2017-03-02 | Abb Technology Ag | Electrical machines and fabrication methods therefor |
| CN105471137A (en) * | 2016-01-11 | 2016-04-06 | 珠海格力节能环保制冷技术研究中心有限公司 | Rotating shaft structure of permanent magnet motor and assembling method of the rotating shaft structure |
| CN109450130A (en) * | 2018-11-02 | 2019-03-08 | 中车永济电机有限公司 | Frequency converting speed regulating three-phase asynchronous electromotor rotor structure |
| US20210087934A1 (en) * | 2019-09-19 | 2021-03-25 | Pratt & Whitney Canada Corp. | Rotor balancing weight |
| CN112953150B (en) * | 2021-02-04 | 2022-05-27 | 北京航空航天大学 | High-power-density high-efficiency permanent magnet synchronous motor for electric aircraft |
-
2021
- 2021-07-06 CN CN202110762815.3A patent/CN113675969B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110474498A (en) * | 2018-05-10 | 2019-11-19 | 通用电气航空系统有限责任公司 | The component of the increasing material manufacturing of motor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113675969A (en) | 2021-11-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7147376B2 (en) | Dynamic bearing device | |
| JP5202143B2 (en) | Outer rotor type vehicle generator | |
| JPH02179238A (en) | Bearing holder construction of motor | |
| WO2013190942A1 (en) | Fluid dynamic bearing device and motor with same | |
| JP2008125330A (en) | Cooling structure for rotor, and method of manufacturing the rotor | |
| CN113691040B (en) | Motor rotor and manufacturing method | |
| CN107147226B (en) | Rotor, motor and related method | |
| JP2019030059A (en) | Rotator and rotary electric machine | |
| CN113675969B (en) | Motor shaft assembly and manufacturing method of motor rotating shaft | |
| JP2021057980A (en) | Rotor and method for manufacturing rotor | |
| JP6094395B2 (en) | Rotating electrical machine rotor | |
| US20120013206A1 (en) | Cooling System and Method for an Electric Machine Module | |
| JP6437186B2 (en) | Railway vehicle | |
| WO2022153689A1 (en) | Rotary electric machine and vehicle | |
| US11542029B2 (en) | Methods of forming a dual-structured aircraft engine starter/generator apparatuses | |
| JP7183139B2 (en) | Rotor and rotary electric machine | |
| JP2005027440A (en) | Rotor of rotating electric machine and its manufacturing method | |
| JP4737445B2 (en) | Split stator and stator | |
| WO2022137416A1 (en) | Electric motor | |
| JP6151488B2 (en) | Fluid dynamic bearing device | |
| JP2024006098A (en) | Rotary electric machine and drive device | |
| CN212367059U (en) | Motor for high-speed pump | |
| CN114072992B (en) | Gear motor, in particular in the form of a gear motor series, with an adapter part | |
| US20230129855A1 (en) | Cooling device and method for manufacturing cooling device | |
| JP2018191449A (en) | Servo motor and method for manufacturing the same |
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 |