CN113675969A - Motor shaft assembly and manufacturing method of motor rotating shaft - Google Patents

Motor shaft assembly and manufacturing method of motor rotating shaft Download PDF

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Publication number
CN113675969A
CN113675969A CN202110762815.3A CN202110762815A CN113675969A CN 113675969 A CN113675969 A CN 113675969A CN 202110762815 A CN202110762815 A CN 202110762815A CN 113675969 A CN113675969 A CN 113675969A
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CN
China
Prior art keywords
motor shaft
motor
cavity
shaft assembly
rotating shaft
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Granted
Application number
CN202110762815.3A
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Chinese (zh)
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CN113675969B (en
Inventor
尚前博
侯晓军
庞聪
耿涛
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CRRC Yongji Electric Co Ltd
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CRRC Yongji Electric Co Ltd
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Priority to CN202110762815.3A priority Critical patent/CN113675969B/en
Publication of CN113675969A publication Critical patent/CN113675969A/en
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Publication of CN113675969B publication Critical patent/CN113675969B/en
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K1/00Details of the magnetic circuit
    • H02K1/06Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22Rotating parts of the magnetic circuit
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K1/00Details of the magnetic circuit
    • H02K1/06Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22Rotating parts of the magnetic circuit
    • H02K1/28Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K15/00Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K15/00Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/14Casings; Enclosures; Supports
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K7/00Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/003Couplings; Details of shafts
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K2213/00Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03Machines characterised by numerical values, ranges, mathematical expressions or similar information
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/64Electric machine technologies in electromobility

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Of Motors, Generators (AREA)

Abstract

The invention provides a motor shaft assembly, and relates to the field of electric appliances. This motor shaft subassembly includes: a rotor core; the motor rotating shaft is connected with the rotor core; wherein, motor shaft includes: the mounting part extends along the first direction, a cavity is arranged in the mounting part, and the rotor 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 a first direction; in a section perpendicular to the first direction, the outer edge dimension of the mounting part is larger than that of the transmission part, and the ratio of the outer edge dimension of the mounting part to that of the transmission part is larger than a preset value. Such a motor shaft assembly has a light weight. The invention also provides a manufacturing method of the motor rotating shaft, which comprises the following steps: and obtaining the integrally formed motor rotating shaft through additive manufacturing.

Description

Motor shaft assembly and manufacturing method of motor rotating shaft
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
The motor is a device for converting electric energy into kinetic energy by an electromagnetic induction principle, and generally comprises a stator and a rotor, wherein the stator provides a variable magnetic field to generate induction current in the rotor and drive the rotor to rotate along with the change of the magnetic field. The motor shaft assembly is generally arranged in the related motor and comprises a rotor core and a motor rotating shaft, and the weight of the motor shaft assembly is large, so that the whole weight of the motor is large.
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 so as to reduce the overall weight of a motor.
The embodiment of the invention provides a motor shaft assembly, which comprises: 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 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, and a cavity is arranged in the mounting part; in a cross section perpendicular to the first direction, the outer edge size of the mounting part is larger than that of the transmission part, and the ratio of the outer edge size of the mounting part to that of the transmission part is larger than a preset value.
Further, the preset value is 1.5.
Further, the transmission part is internally provided with the cavity.
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 includes a closed cavity.
Further, the mounting portion includes: the rotor core is sleeved on the sleeving part, and the transmission part is arranged at the end part of the sleeving part; the positioning part extends out of the circumferential outer surface of the sleeving part along a second direction and is abutted with one end of the rotor core; wherein the second direction is substantially perpendicular to the first direction.
Furthermore, the distance that the positioning part extends out of the circumferential outer surface of the sleeving part 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 substantially parallel to the first direction.
Furthermore, fan blades are arranged in the heat dissipation air duct.
The embodiment of the invention also provides a manufacturing method of a motor rotating shaft, which is used for manufacturing the motor rotating shaft in the motor shaft assembly, and the manufacturing method comprises the following steps: and obtaining the integrally molded motor rotating shaft through additive manufacturing.
The embodiment of the invention provides a motor shaft assembly, which comprises: the rotor core and the motor shaft who is connected with the rotor core, motor shaft includes transmission portion and the installation department that extends along first direction, and is provided with the cavity in the installation department, at least partial installation department is located to the rotor core cover, wherein, in the cross-section of the first direction of perpendicular to, the outer fringe size of installation department is greater than the outer fringe size of transmission portion, and the ratio of the outer fringe size of installation department and the outer fringe size of transmission portion is greater than the default, promptly, the outer fringe size of installation department is greater than the outer fringe size of transmission portion greatly. The outer edge size of the installation part is set to be larger, the installation part is sleeved with the rotor core, meanwhile, the cavity is arranged in the installation part, the inner structure of one part of the rotor core can be integrated in the installation part of the motor rotating shaft, the solid structure in the rotor core is replaced by the structure with the cavity, and therefore the weight of the motor shaft assembly is reduced, and the whole weight of a motor adopting the motor shaft assembly is further reduced.
Drawings
FIG. 1 is a schematic structural 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 provided in an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a motor rotating shaft in the motor shaft assembly provided in the embodiment of the present invention;
fig. 4 is a schematic flow chart illustrating a manufacturing method of a motor rotating shaft according to an embodiment of the present invention.
Description of reference numerals:
1. a motor shaft assembly; 10. a rotor core; 20. a motor shaft; 21. an installation part; 211. a housing portion; 212. A positioning part; 213. a heat dissipation air duct; 22. a transmission section; 23. a cavity; 24. reinforcing ribs; 25. a bearing seal portion.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The individual features described in the embodiments can be combined in any suitable manner without departing from the scope, for example different embodiments and aspects can be formed by combining different features. In order to avoid unnecessary repetition, various possible combinations of the specific features of the invention will not be described further.
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 a synchronous motor, an asynchronous motor, or a stepper motor. The structure of the motor shaft assembly is exemplarily described below by taking the motor shaft assembly as an example, and the type of the motor does not affect the structure of the motor shaft assembly.
In some embodiments, as shown in fig. 1, the motor shaft assembly 1 includes: a rotor core 10 and a motor shaft 20. The rotor core 10 is made of a metal material having a high saturation magnetic induction to increase the intensity of electromagnetic induction, and is made of a silicon steel sheet. Motor shaft 20 is connected with rotor core 10 to support rotor core 10, specifically, motor shaft assembly 1 still includes the casing, and this casing surrounds to form and holds the chamber, and rotor core 10 and motor shaft 20 partly are located this and hold the intracavity, and motor shaft 20's both ends are connected with this casing is rotatable, and motor shaft 20's outside is located to rotor core 10 cover, and simultaneously, motor shaft 20 still is connected with the rotating part of rotor, and some motor shaft 20 stretches out this casing for be connected with other devices that need the drive, with the kinetic energy of output motor shaft assembly 1.
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 a part of the mounting portion 21, specifically, the rotor core 10 is provided with a mounting through hole, and at least a 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 in the first direction, and the transmission part 22 is used to extend out of the housing of the motor shaft assembly 1 and is connected with other devices to be driven so as to drive other devices.
In a cross section perpendicular to the first direction, the outer edge dimension of the mounting portion 21 is greater than the outer edge dimension of the transmission portion 22, and a ratio of the outer edge dimension of the mounting portion 21 to the outer edge dimension of the transmission portion 22 is greater than a preset value, that is, in the cross section perpendicular to the first direction, the outer edge dimension of the mounting portion 21 is much greater than the outer edge dimension of the transmission portion 22, for example, the preset value is 2, and it can be 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 description, the design concept and the advantageous effects of the motor rotation shaft 20 will be exemplarily described below by taking the mounting portion 21 and the transmission portion 22 as circular shafts, and the outer edge dimension of the mounting portion 21 and the outer edge dimension of the transmission portion 22 in a cross section perpendicular to the first direction are referred to as the shaft diameter of the mounting portion 21 and the shaft diameter of the transmission portion 22, respectively.
The following explains the concept of designing the motor shaft 20 according to the present embodiment. The motor rotating 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 rotating shaft 20 provided in this embodiment, in which the shaft diameter of one portion is much larger than that of another portion, if the cutting or welding method is adopted, the economy is poor, and this is not suitable. Specifically, the motor rotating shaft 20 is obtained by cutting, a blank with a shaft diameter not less than the shaft diameter of the mounting portion 21 needs to be manufactured, the shaft diameter of the portion of the blank corresponding to the transmission portion 22 is cut by cutting to be slightly greater than or equal to the shaft diameter of the mounting portion 21 from the shaft diameter not less than the shaft diameter of the mounting portion 21, a large amount of metal materials are consumed in the cutting process, meanwhile, due to the fact that the cutting amount is large, in order to prevent a cutter from being overheated or the cutter from being broken in the cutting process, the transmission portion 22 needs to be obtained by cutting for multiple times, and the machining process is complex and time and labor consuming. Processing installation department 21 and transmission portion 22 respectively to install installation department 21 and transmission portion 22 as an organic whole through the welding, though can reduce the cutting output of cutting process, can leave the welding seam in the welding department, also have simultaneously because the deformation that the welding arouses or the quality risk increase problem that stress concentration leads to, motor shaft 20's wholeness is not good, and at the rotatory in-process of motor shaft 20, the stress that motor shaft 20 received can concentrate in welding seam department, leads to motor shaft 20's life to reduce. The possibility of the above problems can be reduced through additive manufacturing, specifically, an integral motor rotating shaft structure is required to be obtained according to the actual size of each part of the motor rotating shaft 20, the cutting amount of materials can be reduced, meanwhile, the obtained motor rotating shaft 20 has high structural integrity, the phenomenon of stress concentration can be reduced when stress is applied, and the service life of the motor rotating shaft 20 is prolonged. In summary, under the premise that the motor rotating shaft is manufactured by cutting or welding, and it is not thought that the motor rotating shaft 20 can be manufactured by additive manufacturing, a person skilled in the art will not design the motor rotating shaft as the structure of the motor rotating 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 therefore will not be described herein.
The following describes advantageous effects of the motor shaft assembly 1 to which the motor shaft 20 is applied. The shaft diameter of installation department 21 is great, and the inside of installation department 21 is provided with the cavity, locates the outside of the installation department 21 that has great shaft diameter with rotor core 10 cover, is equivalent to replacing the entity part of rotor core 10 for having the structure of cavity to reduce the weight of motor shaft subassembly 1, and then reduced the weight of the motor that has used this motor shaft subassembly 1. Specifically, a mounting through hole is formed in the rotor core 10, and at least a portion of the mounting portion 21 is located in the mounting through hole, so that the rotor core 10 is sleeved on the mounting portion 21. The shaft diameter of the mounting part 21 is set to be larger, the aperture of the mounting through hole of the rotor core 10 can be increased, and meanwhile, the cavity 23 is formed in the mounting part 21, so that the part of the solid structure inside the rotor core 10 is integrated in the mounting part 21 of the motor rotating shaft 20, and the solid structure of the part is replaced by a structure with the cavity, so that the weight of the motor shaft assembly 1 is reduced, and the whole weight of a motor adopting the motor shaft assembly 1 is further reduced. It should be noted that, only a part of the structure near the outer surface of the rotor core 10 participates in the electromagnetic induction and is used for enhancing the strength of the electromagnetic induction, while the internal structure of the rotor core 10 does not participate in the electromagnetic induction, the internal structure of the rotor core 10 is integrated with the mounting portion 21 of the motor rotating shaft 20, and the material of the part is replaced by the structure with the cavity from the solid structure, so that the mass of the motor shaft assembly machine 1 can be reduced on the premise of not affecting the strength of the electromagnetic induction of the motor shaft assembly 1. The embodiment of the invention provides a motor shaft assembly, which comprises: the rotor core and the motor shaft who is connected with the rotor core, motor shaft includes transmission portion and the installation department that extends along first direction, and is provided with the cavity in the installation department, at least partial installation department is located to the rotor core cover, wherein, in the cross-section of the first direction of perpendicular to, the outer fringe size of installation department is greater than the outer fringe size of transmission portion, and the ratio between the outer fringe size of installation department and the outer fringe size of transmission portion is greater than the default, promptly, the outer fringe size of installation department is greater than the outer fringe size of transmission portion greatly. The outer edge size of the installation part is set to be larger, the installation part is sleeved with the rotor core, meanwhile, the cavity is arranged in the installation part, the inner structure of one part of the rotor core can be integrated in the installation part of the motor rotating shaft, the solid structure in the rotor core is replaced by the structure with the cavity, and therefore the weight of the motor shaft assembly is reduced, and the whole weight of a motor adopting the motor shaft assembly is further reduced.
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, an outer edge dimension of the mounting portion 21 is at least 1.5 times an outer edge dimension of the transmission portion 22, and exemplarily, in a cross section perpendicular to the first direction, an outer edge dimension of the transmission portion 22 is 100 mm, and then an outer edge dimension of the mounting portion 21 is not less than 150 mm.
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 and thus the motor shaft assembly 1 is further reduced. Alternatively, the volume of the cavity 23 provided in the transmission portion 22 is smaller than the volume of the cavity 23 provided in the mounting portion 21, i.e., so as to make full use of the inner space of the mounting portion 21, and a cavity having a larger volume is provided in the mounting portion 21 having 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 arranged in any form, for example, the cavities 23 in the mounting portion 21 and the transmission portion 22 may be arranged 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. It should be noted that the size of the cavity in the transmission part 22 also needs to be determined according to the strength of the transmission part 22, so that the transmission part 22 does not break or deform while transmitting torque.
Optionally, the end of the transmission part 22 is provided with the cavity 23, and after the integrally formed motor rotating shaft 20 is obtained through additive manufacturing, the motor rotating 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 rotating shaft 20 is further processed. For example, after the integrally molded motor shaft 20 is obtained by additive manufacturing, the outer surface of the mounting portion 21 needs to be further processed by grinding, so 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 a clamping jaw of the grinding machine, and the ejector rod of the grinding machine is pushed against the cavity 23 of the end surface of the transmission portion 22, so that the motor shaft 20 is fixed to the grinding machine.
In some embodiments, as shown in fig. 2, the cavities 23 in the mounting portion 21 and the transmission portion 22 both extend in a first direction (the first direction is indicated by an arrow in fig. 2), i.e. the cavities 23 extend in the same direction as the mounting portion 21 and the transmission portion 22. The extending direction of the cavity 23 is the same as the length direction of the mounting part 21 and the transmission part 22, the structure of the motor rotating shaft 20 is simplified, the manufacturing difficulty of the motor rotating shaft 20 is reduced, meanwhile, the weight of each part of the mounting part 21 in the first direction is the same, the weight of each part of the transmission part 22 in the first part is the same, the dynamic unbalance of the motor rotating shaft 20 in rotation is reduced, the vibration and the noise of the motor shaft assembly 1 in the rotation process are reduced, and the service life of the motor rotating shaft 20 is prolonged. Optionally, as shown in fig. 2, a mass center axis of the cavity 23 in the mounting portion 21 coincides with a mass center axis of the mounting portion 21, and a mass center axis of the cavity 23 in the transmission portion 22 coincides with a mass center axis of the transmission portion 22, so as to further reduce the dynamic unbalance degree of the motor shaft assembly 20 in the rotation process, thereby reducing the vibration and noise generated by the motor shaft assembly 1 in the rotation process, and further prolonging the service life of the motor shaft assembly 20.
In some embodiments, as shown in fig. 2, in a cross section perpendicular to the first direction, an outer edge dimension of the cavity 23 in the mounting portion 21 is larger than an outer edge dimension of the cavity in the transmission portion 22, that is, the cross section area of the cavity in the mounting portion 21 is set to be larger than the cross section area of the cavity 23 in the transmission portion 22 on the premise that the cavity 23 extends in the first direction (the first direction is indicated by an arrow in fig. 2), so that the internal space of the mounting portion 21 having a larger size is fully utilized on the premise that the dynamic unbalance degree of the motor rotating shaft 20 is reduced, thereby further reducing the weight of the motor rotating 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 external space of the motor rotating shaft 20, so that while the cavity is provided in the motor rotating shaft 20, the possibility that dust or liquid in the external space of the motor rotating shaft 20 enters the closed cavity is reduced, the possibility that the inside of the motor rotating shaft 20 is corroded is reduced, and the service life of the motor rotating shaft 20 is prolonged. Optionally, the cavities 23 in the mounting portion 21 and the transmission portion 22 are closed cavities. It should be noted that, through cutting or casting process, it is impossible to provide a closed cavity in the mounting portion 21 and the transmission portion 22 of the integrally formed motor shaft 20, specifically, through cutting, a cavity communicating with the external space of the motor shaft 20 needs to be obtained in the motor shaft 20 through cutting, and then through means such as welding or splicing, an opening of the cavity is closed by using a closing element, which is complicated in processing steps and cannot realize the integral forming of the motor shaft 20, the integrity of the motor shaft 20 is not good, stress concentration is easily formed at the splicing position such as a welding seam, and further the service life of the motor shaft 20 is shortened, and obtaining the motor shaft 20 with a closed cavity through casting may cause that a core cannot be taken out from the motor shaft 20 after the motor shaft 20 is cast. The problems can be overcome by additive manufacturing, and when the integrity of the motor rotating shaft 20 is improved by integrally forming the motor rotating shaft 20, the motor rotating shaft 20 with a closed cavity can be directly processed, so to sum up, the person skilled in the art can form the motor rotating shaft 20 by cutting or casting without realizing that the closed cavity is not arranged in the mounting part 21 and the transmission part 22 of the motor rotating shaft 20 on the premise that the motor rotating shaft 20 can be integrally formed by additive manufacturing.
Optionally, referring to fig. 1 and 2, a wall surface of the mounting portion 21 and/or the transmission portion 22 adjacent to the cavity 23 is provided with a reinforcing rib 24, and the reinforcing rib 24 extends from the wall surface to the inside of the cavity 23, so that on the premise of not affecting the shape of the outer surface of the motor rotating shaft 20, the structural strength of the motor rotating shaft 20 is improved, and the service life of the motor rotating shaft 20 is further prolonged. Optionally, the reinforcing rib 24 extends along the first direction, and the plurality of reinforcing ribs 24 are arranged in the cavity 23 around the first direction at intervals, so that the strength of the motor rotating shaft 20 is further increased, and the service life of the motor rotating shaft 20 is prolonged. It should be noted that the skilled person would not think of providing the reinforcing ribs 24 in the closed cavity, without the skilled person thinking that the motor shaft 20 with the closed cavity could be manufactured by additive manufacturing and integral molding.
In some embodiments, as shown in fig. 3, the mounting portion 21 includes: a sleeve portion 211 and a positioning portion 212. The rotor core 10 shown in fig. 1 is sleeved on the sleeving portion, and the transmission portion 22 is disposed at an end of the sleeving portion 211, alternatively, the transmission portion 22 may be disposed at one end of the sleeving portion 211, or disposed at two ends of the sleeving portion 211. The positioning portion 212 extends from the circumferential outer surface of the sleeve portion 211 to a second direction (the second direction is shown by a dotted arrow in fig. 3), wherein an axial outer surface of the positioning portion 212 may be an outer surface of a non-end portion of the positioning portion 212, and after the rotor core 10 is sleeved on the sleeve portion 211, the positioning portion 212 can abut against one end surface of the rotor core 10 in a first direction (the first direction is shown by a solid arrow in fig. 3), so as to limit the movement of the rotor core 10 relative to the sleeve portion 211 in the first direction. The second direction is substantially perpendicular to the first direction, that is, the positioning portion 212 extends along a direction substantially perpendicular to the outer surface of the sleeve portion 211, so that the size of the positioning portion 212 perpendicular to the direction of the sleeve portion 211 is fully utilized, the contact area between the positioning portion 212 and the rotor core 10 is increased, and the movement of the rotor core 10 relative to the sleeve portion 211 along the first direction is more reliably limited, and the second direction is substantially perpendicular to the first direction, it can be understood that an included angle is allowed to exist between the first direction and the second direction due to a manufacturing error, and a difference between the included angle between the first direction and the second direction and 90 degrees is smaller than 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 85 degrees to 95 degrees. It should be noted that only one positioning portion 212 is provided on the circumferential outer surface of the sleeve portion 211, that is, the sleeve portion 211 is only used for abutting against one side of the rotor core 10 along the first direction, so as to limit the movement of one side of the rotor core 10 along the first direction, and the assembly between the rotor core 10 and the sleeve portion 211 is not affected.
In some embodiments, as shown in fig. 3, a 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, an outer edge dimension of the positioning portion 212 is much greater than an outer edge dimension of the sleeve portion 211, so as to increase a contact area between the end surface of the rotor core 10 in the first direction in fig. 1 and the positioning portion 212, and further more reliably limit the movement of the rotor core 10 relative to the motor rotating shaft 20 in the first direction, where the preset threshold may be, for example, half of 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, through cutting or welding, it is difficult to make the outer edge dimension of the positioning portion 212 much larger than the structure of the mounting portion 21 of the outer edge dimension of the sleeve portion 211, specifically, the mounting portion 21 of the motor shaft 20 is obtained through cutting, a blank having a shaft diameter not smaller than the shaft diameter of the positioning portion 212 needs to be manufactured, and the shaft diameter of the portion of the blank corresponding to the sleeve portion 211 is cut to be slightly larger than or equal to the shaft diameter of the sleeve portion 211 through cutting, so that a large amount of metal material is consumed in the cutting process. The cover of processing installation department 21 establishes portion 211 and location portion 212 respectively, then establishes portion 211 and location portion 212 fixed connection with the cover through the welding, can produce the welding seam between cover portion 211 and location portion 212, and the wholeness of installation department 21 is not good, and the stress that the installation department 21 of motor shaft 20 received can produce stress concentration in this welding seam department to shorten motor shaft 20's life. In summary, in the premise that the person skilled in the art manufactures the mounting portion 21 of the motor rotating shaft 20 by cutting or welding and does not think that the mounting portion 21 of the motor rotating shaft 20 can be obtained by additive manufacturing and integral molding, the person skilled in the art will not design the mounting portion of the motor rotating shaft as the structure of the mounting portion 21 provided in the present embodiment.
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 may cool the rotor core 10, thereby reducing a possibility of damage of the rotor core 10 due to overheating, and extending a service life of the rotor core 10, and at the same time, compared with a heat dissipation scheme in which heat dissipation holes are disposed in a related motor shaft assembly, the provision of the heat dissipation air duct 213 further reduces a weight of the motor rotating shaft 20. The length direction of the heat dissipation air channel 213 may be the direction of the heat dissipation air channel 213 with the largest size, and the length direction of the heat dissipation air channel 213 is substantially parallel to the first direction, which may be understood as an included angle between the length direction of the heat dissipation air channel 213 and the first direction when manufacturing errors are allowed, 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, and the preset angle may be 5 degrees.
Optionally, as shown in fig. 3, the heat dissipation air duct 213 penetrates through two end faces 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, improve the overall strength of the motor rotating shaft, and further extend the service life of the rotor core 10. It should be noted that it is difficult to implement the structure in which the heat dissipation air duct 213 penetrates through both end surfaces of the positioning portion along the first direction by cutting, specifically, the heat dissipation air duct 213 penetrates through the positioning portion 212 by cutting, and a cutter passing hole penetrating through both end surfaces of the positioning portion 212 along the first direction needs to be provided in the positioning portion 212, so that a cutting tool passes through the positioning portion 212, which not only increases the manufacturing difficulty of the positioning portion 212, but also reduces the structural strength of the positioning portion 212, thereby reducing the reliability of the positioning portion 212 in limiting the movement of the rotor core 10 relative to the sleeve portion 211 along the first direction. And process the locating part 212 and the cover portion 211 with heat dissipation wind channel 213 separately, and fix the locating part 212 in the peripheral surface of the cover portion 211 through welding, not only reduced the wholeness of the installation department 21, can produce stress concentration in the welding seam between the cover portion 211 and the locating part 212, reduce the life of the installation department 21, meanwhile, because the cover portion 211 is provided with the heat dissipation wind channel 213, the contact area between the cover portion 211 and the locating part 212 is less, the length of the cover portion 211 and the locating part 212 has been reduced, thereby reduce the fixing force between the cover portion 211 and the locating part 212, further reduce the overall structure intensity of the installation department 21. The problem of the above-mentioned machining by cutting or welding can be overcome by integrally forming the mounting portion 21 of the motor shaft 20 with the heat dissipation duct 213 penetrating the positioning portion 212 by additive manufacturing. In summary, under the premise that the person skilled in the art manufactures the mounting portion 21 of the motor rotation shaft 20 by cutting or welding, and does not think that the mounting portion 21 of the motor rotation shaft 20 can be obtained by additive manufacturing and integral molding, the person skilled in the art will not design the mounting portion of the motor rotation shaft as the structure of the mounting portion 21 provided in the present embodiment.
In some embodiments, the heat dissipating air channel 213 is formed by heat dissipating ribs disposed at intervals around the outer surface of the sleeving part 211, so that the heat dissipating ribs drive air to flow during the high-speed rotation process of 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 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 an additional air driving device. Optionally, the fan blade is disposed on a side of the positioning portion 212 opposite to a side for disposing the rotor core 10, so as to further enhance the heat dissipation effect on the rotor core 10 without reducing the length of the portion of the heat dissipation air channel 213 contacting the rotor core 10.
In some embodiments, the motor shaft 20 further includes a balance block mounting structure for mounting a dynamic balance block at a corresponding position to reduce the dynamic unbalance of the motor shaft 20, so as to reduce the noise and vibration generated during the rotation of the motor shaft 20 and prolong the service life of the motor shaft 20. It should be noted that the balance weight mounting structure may be any structure capable of mounting a dynamic balance weight, for example, the balance weight mounting structure may be a threaded hole, and the dynamic balance weight is fixed to the threaded hole by a bolt, so as to fix the dynamic balance weight to the motor shaft 20. Meanwhile, the balance weight mounting structure may be disposed at any position where the moment of inertia of the motor shaft 20 can be adjusted, for example, the dynamic balance mounting structure may be disposed on the surface of the positioning portion 212. Optionally, the motor shaft 20 is further provided with a transmission key, the transmission key is used for circumferentially fixing other accessories of the motor shaft assembly 1, which need to be driven by the motor shaft 20, to the motor shaft 20, so that the accessories can be driven by the motor shaft 20 to rotate together, the transmission key is also used for circumferentially fixing the rotor core 10 and the motor shaft 20, so that the rotor of the motor can drive the motor shaft 20 to rotate together, and the transmission key is integrally formed on the motor shaft 20 through material increase manufacturing, has greater structural strength, and can transmit greater 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, the transmission portion 22 is disposed at both ends of the mounting portion 21 along 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 by grease, and the two bearings are respectively abutted against the bearing sealing parts 25 at the two ends of the mounting part 21, so that the dissipation of the grease in the bearings is reduced, and the abrasion of the bearings is reduced. Optionally, the bearing sealing portion 25 is a labyrinth sealing ring, specifically, the end face of the labyrinth sealing ring for abutting against the bearing is provided with a plurality of annular sealing teeth arranged in sequence, a series of cut-off gaps and expansion cavities are formed between the teeth, and the sealed medium generates a throttling effect when passing through the gaps of the labyrinth to prevent the lubricating grease from dissipating. It should be noted that the bearing sealing portion 25 is a portion integrated with the motor rotating shaft 20 in the process of manufacturing the motor rotating shaft 20 by additive manufacturing and integral molding, so that the integrity of the motor rotating shaft 20 is further increased, and the structural strength of the motor rotating shaft 20 is 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 obtaining the integrally formed motor rotating shaft through additive manufacturing. In which additive manufacturing may be a manufacturing method in which successive layers of material are provided on top of each other to build up a three-dimensional part layer by layer, with adjacent layers of material being fused between them to integrally form the integral part. It should be understood that additive manufacturing in embodiments of the present invention refers to manufacturing primarily by adding material during the manufacturing process, but that other processing steps may also be added to a particular manufacturing process, for example, layer addition processing, layer subtraction processing, or hybrid processing.
The 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. A specific process of obtaining the integrally molded motor shaft by additive manufacturing will be described below by taking the additive manufacturing as a selective laser sintering method. As shown in fig. 4, the process of the method for manufacturing a motor shaft according to the present invention mainly includes:
and S101, spraying metal powder with a preset thickness on the bearing base surface, and sintering the technical powder layer into a first section layer with a corresponding shape by laser according to the structure of the motor rotating shaft.
Specifically, in the design process, the motor rotating shaft is divided into a plurality of continuous design cross-section layers along the length direction of the motor rotating shaft according to the thickness of the cross-section layer formed by sintering each time through a laser sintering method, a first design cross-section layer is determined according to the manufacturing sequence of the design cross-section layers, and metal powder is sintered into the first cross-section layer with the shape consistent with that of the first design cross-section layer through laser. For example, if the cross-sectional layers of the motor rotor are sequentially formed 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 cross-sectional layer is a virtual structure into which a model of the motor rotating shaft is cut during the design process, and the virtual structure is a manufacturing target in the additive manufacturing process rather than an actual structure.
And S102, spraying metal powder on the first cross-section layer and sintering to sequentially form other cross-section layers, so that the first cross-section layer and each other cross-section layer are solidified to form the motor rotating shaft.
Optionally, each cross-sectional layer of the motor rotating 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 cross-sectional layer is sequentially sintered into the motor rotating shaft with the shape consistent with that of the required motor rotating shaft, so that the integrally formed motor rotating shaft is obtained.
Optionally, after forming a cross-section layer by sintering, removing the excess metal powder on the cross-section layer, and after removing the excess metal powder, manufacturing the next cross-section layer to prevent the excess metal powder from affecting the manufacture of the next cross-section layer.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.

Claims (11)

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 arranged in the mounting part, and the rotor 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 a cross section perpendicular to the first direction, the outer edge size of the mounting part is larger than that of the transmission part, and the ratio of the outer edge size of the mounting part to that of the transmission part is larger than a preset value.
2. The motor shaft assembly of claim 1, wherein the preset value is 1.5.
3. The motor shaft assembly of claim 1, wherein the cavity is disposed within the transmission portion.
4. The motor shaft assembly of claim 3, wherein the cavity in the mounting portion and the cavity in the transmission portion each extend in the first direction.
5. The motor shaft assembly of claim 4, wherein an outer dimension of said cavity in said mounting portion is greater than an outer dimension of said cavity in said transmission portion in a cross-section perpendicular to said first direction.
6. The motor shaft assembly of any of claims 3-5, wherein at least one of the cavity in the mounting portion and the cavity in the transmission portion includes a closed cavity.
7. The motor shaft assembly of claim 1, wherein the mounting portion includes:
the rotor core is sleeved on the sleeving part, and the transmission part is arranged at the end part of the sleeving part;
the positioning part extends out of the circumferential outer surface of the sleeving part along a second direction and is abutted with one end of the rotor core; wherein the second direction is substantially perpendicular to the first direction.
8. The motor shaft assembly of claim 7, wherein the positioning portion extends from the circumferential outer surface of the sleeve portion by a distance greater than a predetermined threshold.
9. The motor shaft assembly of claim 1, wherein the outer surface of the mounting portion is provided with a heat dissipating air channel, and a length direction of the heat dissipating air channel is substantially parallel to the first direction.
10. The motor shaft assembly of claim 9, wherein fan blades are disposed within the cooling air duct.
11. A manufacturing method of a motor shaft, which is used for manufacturing a motor shaft in a motor shaft assembly according to any one of claims 1 to 10, comprising: and obtaining the integrally molded motor rotating shaft through additive manufacturing.
CN202110762815.3A 2021-07-06 2021-07-06 Motor shaft assembly and manufacturing method of motor rotating shaft Active CN113675969B (en)

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Citations (8)

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Publication number Priority date Publication date Assignee Title
US20060043811A1 (en) * 2004-07-30 2006-03-02 Raymond Ong 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
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
US20170063183A1 (en) * 2015-08-29 2017-03-02 Abb Technology Ag Electrical machines and fabrication methods therefor
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
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
US20210087934A1 (en) * 2019-09-19 2021-03-25 Pratt & Whitney Canada Corp. Rotor balancing weight
CN112953150A (en) * 2021-02-04 2021-06-11 北京航空航天大学 High-power-density high-efficiency permanent magnet synchronous motor for electric aircraft

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060043811A1 (en) * 2004-07-30 2006-03-02 Raymond Ong 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
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
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
CN112953150A (en) * 2021-02-04 2021-06-11 北京航空航天大学 High-power-density high-efficiency permanent magnet synchronous motor for electric aircraft

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