Stator, rotor and press-fitting method and press-fitting equipment for axial centering of stator and rotor iron cores

Abstract

The invention discloses a stator, a rotor and a press-fitting method and press-fitting equipment for axial centering of stator and rotor iron cores, and the press-fitting method of the stator comprises the steps: placing the stator on a stator base, and obtaining the stack thickness c1 of the stator and the thickness b1 of the stator base; the stator pressing head ballasts the stator placed on the stator base, wherein ballasting is carried out in a pressure stop mode; acquiring a displacement ruler value X1 of a stator pressure head in the stator ballasting process; the stator pressing head grabs the stator to a stator shrinkage fit station and presses the stator into the machine shell; the first axial position comprises the distance d1 between the center of the stator in the axial direction and the stator workbench and the press fitting variable Y1 of the stator at the stator hot jacket station. According to the press fitting method, the bad centering state can be well reduced, so that the motor performance is improved, the axial stress fluctuation is reduced, the service life of the bearing is effectively prolonged, and the noise is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of automated assembly, and in particular to a press-fitting method and press-fitting equipment for axially aligning a stator, a rotor, and a stator and rotor iron core. Background Art

[0002] The centrifugal force of the stator and rotor directly affects the torque performance of the motor and causes axial force fluctuations, which shortens the bearing life and causes noise problems. In the dimension chain of centrifugal calculation, the biggest influence is the fluctuation caused by the thickness of the stator and rotor core, including the size itself and the changes under pressure. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a stator press-fitting method, which can effectively reduce the bad state of centering, thereby improving the performance of the motor, reducing the axial force fluctuation, and effectively increasing the bearing life and reducing noise.

[0004] An object of the present invention is to provide a method for press-fitting a rotor.

[0005] One object of the present invention is to provide a method for press-fitting a stator and rotor core in axial alignment.

[0006] One object of the present invention is to provide a press-fitting device for axially aligning the stator and rotor cores.

[0007] According to the stator press-fitting method of the embodiment of the present invention, the stator is press-fitted on a stator workbench, the stator workbench includes a stator loading station with a stator base and a stator shrink-fitting station with a housing, and the stator press-fitting method includes: S11, placing the stator on the stator base, and obtaining the stack thickness c of the stator 1 , the thickness b of the stator base 1 ; S12, the stator pressure head ballasts the stator placed on the stator base, including: ballast through the pressure stop mode; S13, obtain the displacement scale value X of the stator pressure head during the stator ballast process 1 ; S14, the stator pressing head grabs the stator to the stator shrink fitting station, and presses the stator into the housing; S15, the first axial position includes the distance d between the center of the stator in the axial direction and the stator workbench 1 , the stator is pressed in the stator shrink fitting station variable Y 1 , where Y 1 Satisfied: Y 1 =X 1 +Δ1+Δ2, where the equipment and product model compensation Δ1=(b 1 + c 1 / 2) -d 1 , Δ2=-(X 1 -(b 1 +c 1 )) / 2.

[0008] According to the stator loading method of the embodiment of the present invention, the stator can be ballasted better and can be ballasted to a predetermined position in the casing, the accuracy is effectively improved, the height of the stator core under pressure can be detected, and the ballasted position of the stator can be automatically compensated during press-fitting, which can reduce the influence of the stacking thickness of the stator core on the stator and rotor alignment.

[0009] In some embodiments of the present invention, the lower limit of the ballast force in the pressure stop mode ensures that the pressing head does not stop without touching the iron core due to changes in the acceleration of the pressing head or interference from abnormally light objects during the pressing process, and the recommended value is 100 Newtons. The upper limit ensures that the pressing force does not cause permanent deformation of the iron core, and the recommended value is 20,000 Newtons. Considering that the iron core is composed of stacked punching sheets and the height deformation is reduced under force, this pressure value is recommended to be 500~1000 Newtons as the friction between the stator and the casing.

[0010] According to the rotor press-fitting method of the embodiment of the present invention, the rotor is press-fitted on the rotor workbench, the rotor workbench includes a rotor loading station having a rotor base and a rotor press-fitting station having a rotor shaft and a rotor shaft base, wherein the rotor shaft base has an axial hole, the rotor shaft is passed through the rotor shaft base and abuts against the rotor workbench, and the rotor press-fitting method includes: S21, a plurality of rotors are stacked on the rotor base along the axial direction, and a stack thickness c of the plurality of rotors is obtained. 2 , the thickness b of the rotor base 2 ; S22, the rotor pressure head ballasts the plurality of rotors placed on the rotor base, including: ballast by pressure stop mode; S23, obtain the displacement scale value X of the rotor pressure head during the rotor ballast process 2 ; S24, the rotor pressing head grabs a single rotor to the rotor pressing station and presses the rotor onto the rotor shaft; S25, the second axial position includes the distance d between the axial center of the plurality of rotors and the rotor workbench 2 , obtain the pressing variable Y of each rotor in the rotor shrink fitting station n , where Y of the first to n-1th ballasted rotors is n All meet: Y n =X 2 +Δ3,Δ3=(a 2 -b 2 -X 2 ) / 2+b 2 -d2 + (n-1-(X n -1)*2)*c 2 / ne; Y of the nth ballasted rotor n Satisfied: Y n =X 2 +Δ4, where Δ4=(a 2 -b 2 -X 2 ) / 2+b 2 -d 2 + (n-1-(X n -1)*2)*( X 2 -b 2 ) / n, where n is the total number of rotor sections, X n is the number of press-fits of the current segment of a single rotor, a 2 is the distance between the rotor pressure head and the rotor workbench when the rotor pressure head is in the initial position, and e is the reserved deviation value.

[0011] According to the rotor press-fitting method of the present invention, the rotor can be well ballasted, and multiple rotors can be ballasted to predetermined positions on the rotating shaft, the accuracy is effectively improved, the heights of multiple rotors under pressure can be detected, and the ballasted positions of multiple rotors can be automatically compensated during press-fitting, which can reduce the influence of the stacking thickness of multiple rotors on the centering of the stator and rotor.

[0012] In some embodiments of the present invention, the lower limit of the ballast force in the pressure stop mode ensures that the pressing head does not stop without touching the iron core due to changes in the acceleration of the pressing head or interference from abnormally light objects during the pressing process. The recommended value is 100 Newtons. The upper limit ensures that the pressing force does not cause permanent deformation or breakage of the iron core and the magnet. The recommended value is 10,000 Newtons. Considering that the iron core is composed of stacked punching sheets and its height is reduced under stress, this pressure value is recommended to be 500~1000 Newtons.

[0013] In some embodiments of the present invention, the rotor is axially spaced apart from the rotor shaft base.

[0014] In some embodiments of the present invention, at the rotor loading station, a magnetic isolation plate is provided between two adjacent rotors in the axial direction, and the thickness of the magnetic isolation plate in the axial direction is f. Then: Y of the first to n-1th ballasted rotors is n All meet: Y n =X 2 +Δ5,Δ5=(a 2 -b 2 -X 2 –(n-1)*f) / 2+b 2 -d 2 + (nX n)*f+(n-1-(X n -1)*2)*(c 2 -(n-1)*f) / ne; Y of the nth ballasted rotor n Satisfied: Y n =X 2 +Δ6,Δ6=(a 2 -b 2 -X 2 –(n-1)*f) / 2+b 2 -d 2 + (n-1-(X n -1)*2)*( X 2 -b 2 -(n-1)*f) / n.

[0015] According to an embodiment of the present invention, a method for axially centering the stator and rotor cores by press-fitting includes: obtaining the axial position of the stator in the casing as a first axial position; obtaining the axial position of the rotor on the rotor shaft as a second axial position; S3, according to the first axial position and the second axial position, assembling the stator and the rotor.

[0016] According to the axial centering press-fitting method of the stator and rotor cores in the embodiment of the present invention, when the rotor and the stator are assembled, the rotor and the stator can be better aligned, thereby effectively reducing the poor state of centering (centering: the correspondence between the axial center of the stator and the axial centers of multiple rotors), thereby improving the performance of the motor, reducing axial force fluctuations, and effectively increasing the bearing life and reducing noise.

[0017] In some embodiments of the present invention, the distance d between the center of the stator in the axial direction and the stator workbench is 1 , the distance d between the center of the rotor in the axial direction and the rotor worktable 2 , satisfy: d 1 =d 2 +Δ7, Δ7 is the distance between the assembly surface of the casing and the motor cover and the shaft table surface of the rotor shaft.

[0018] According to an embodiment of the present invention, the press-fitting equipment for axially aligning the stator and rotor cores comprises: a stator workbench, the stator workbench comprising a stator loading station having a stator base and a stator shrink-fit station having a casing; a stator pressing head, the stator pressing head being movably arranged above the stator workbench for press-fitting the stator and transporting the stator; a rotor workbench, the rotor workbench comprising a rotor loading station having a rotor base and a rotor pressing station having a rotor shaft and a rotor shaft base, wherein the rotor shaft base has an axial hole, the rotor shaft is penetrated through the rotor shaft base and abuts against the rotor workbench; a rotor pressing head, the rotor pressing head being movably arranged above the rotor workbench for press-fitting the rotor and transporting the rotor.

[0019] According to the axial centering press-fitting equipment for stator and rotor cores of an embodiment of the present invention, when the rotor and the stator are assembled, the rotor and the stator can be better aligned, thereby effectively reducing the poor state of centering (centering: the correspondence between the axial center of the stator and the axial centers of multiple rotors), thereby improving the performance of the motor, reducing axial force fluctuations, and effectively increasing the bearing life and reducing noise.

[0020] In some embodiments of the present invention, the axial centering press-fitting equipment for the stator and rotor cores also includes a control center, which is used to control the movements of the stator press head and the rotor press head, and is suitable for recording the displacement scale values ​​of the stator press head and the rotor press head.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 It is a structural schematic diagram of a stator pressing head on a stator workbench of a press-fitting device according to the present invention when operating at a stator loading station and a stator shrink-fitting station respectively; Figure 2 It is a schematic structural diagram of a rotor pressing head on a rotor workbench of a press-fitting device according to the present invention when operating at a rotor loading station and a rotor press-fitting station respectively; Figure 3 is a cross-sectional view of a stator assembled in a housing and a rotor assembled on a rotor shaft according to the present invention; Figure 4 It is a structural schematic diagram of the rotor press head on the rotor workbench of the pressing equipment according to the present invention when operating at the rotor loading station and the rotor pressing station respectively, wherein, at the rotor loading station, a magnetic isolation plate is arranged between two axially adjacent rotors.

[0023] Reference numerals: 1. Stator workbench; 2. Stator base; 3. Casing; 4. Stator pressure head; 5. Stator; 6. Rotor workbench; 7. Rotor base; 8. Rotor shaft; 9. Rotor pressure head; 10. Rotor; 11. Magnetic isolation plate. DETAILED DESCRIPTION

[0024] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0025] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] The centrifugal force of the stator and rotor directly affects the torque performance of the motor and causes axial force fluctuations, which shortens the bearing life and causes noise problems. In the dimension chain of centrifugal calculation, the biggest influence is the fluctuation caused by the thickness of the stator and rotor core, including the size itself and the changes under pressure.

[0028] The present invention proposes a press-fitting method, including a press-fitting method for a stator 5, a press-fitting method for a rotor 10, and a press-fitting method for axially aligning stator and rotor cores. When the stator 5 is press-fitted, the position of the axial center of the stator 5 relative to the housing 3 is eliminated when the stator 5 is press-fitted into the housing 3, and the position of the axial centers of multiple rotors 10 relative to the rotor shaft 8 is eliminated when the rotor 10 is press-fitted onto the rotor shaft 8. Therefore, when the stator 5 and the rotor 10 are assembled, the poor state of centering (centering: the axial center of the stator 5 corresponds to the axial centers of multiple rotors 10) can be better reduced, thereby improving the performance of the motor, reducing the axial force fluctuation, and effectively increasing the bearing life and reducing the noise.

[0029] Reference below Figure 1-Figure 2 A press-fitting method of the stator 5 according to an embodiment of the present invention is described.

[0030] like Figure 1 As shown, according to the press-fitting method of the stator 5 of the embodiment of the present invention, the stator 5 is press-fitted on the stator workbench 1, the stator workbench 1 includes a stator loading station with a stator base 2 and a stator shrink-fitting station with a housing 3, and the press-fitting method of the stator 5 includes: S11, placing the stator 5 on the stator base 2, and obtaining the stacking thickness c of the stator 5 1 , the thickness b of the stator base 2 1 ; S12, the stator pressure head 4 ballasts the stator 5 placed on the stator base 2, including: ballast through the pressure stop mode; S13, obtain the displacement scale value X of the stator pressure head 4 during the stator 5 ballast process 1 ; S14, the stator pressure head 4 grabs the stator 5 to the stator shrink fitting station, and presses the stator 5 into the housing 3; S15, the first axial position includes the distance d between the center of the stator 5 in the axial direction and the stator workbench 1 1 , the press-fitting variable Y of stator 5 at the stator shrink-fit station 1 , where Y 1 Satisfied: Y 1 =X 1 +Δ1+Δ2, where the equipment and product model compensation Δ1=(b 1 + c 1 / 2) -d 1 , Δ2=-(X 1 -(b 1 +c 1 )) / 2.

[0031] That is to say, the stator 5 can be firstly ballasted at the stator loading station for the first time. The stator 5 is a key component of the motor, which usually includes a winding coil and an iron core. The step of "ballasting the stator 5" performed before the stator 5 is installed into the housing 3 (motor housing) refers to the process of pre-treating the stator 5. During the ballasting process, as the stator pressure head 4 continues to press the stator 5, the pressure between the stator pressure head 4 and the stator 5 gradually increases. When the pressure value rises to a predetermined value, the stator pressure head 4 stops ballasting the stator 5, thereby completing the first ballasting of the stator 5. During the first ballasting process, the displacement scale value X1 of the stator pressure head 4 from the initial position can be obtained. Here, it can be understood that the stator pressure head 4 has an initial position, and at the initial position, the distance between the stator pressure head 4 and the stator workbench 1 is a1.

[0032] After the first ballast of the stator 5 is completed, there may be an inner support in the stator pressing head 4, and the inner support may be clamped on the inner side of the iron core of the stator 5, so as to realize the grasping of the stator 5. Specifically, after the stator pressing head 4 grasps the stator 5, the stator 5 can be moved and transferred to the upper side of the casing 3, that is, the stator pressing head 4 transfers the stator 5 to the stator shrink fitting station. At this time, the stator pressing head 4 can gradually descend with the stator 5, and then ballast it into the casing 3, and by reasonably controlling the pressing variable Y of the stator pressing head 4 at this time 1 , which enables the stator 5 to be pressed into a more accurate position in the housing 3. 1 Satisfied: Y 1 =X 1 +Δ1+Δ2, where the equipment and product model compensation Δ1=(b 1 + c 1 / 2) -d 1 , Δ2=-(X 1 -(b 1 +c 1 )) / 2, where Δ1=(b 1 + c 1 / 2) -d 1 is a fixed compensation amount, Δ2=-(X 1 -(b 1 +c 1 )) / 2, because it will change with X 1 , therefore, Δ2 is the change compensation amount.

[0033] Therefore, according to the loading method of the stator 5 in the embodiment of the present invention, the stator 5 can be ballasted better and the stator 5 can be ballasted to a predetermined position in the casing 3, the accuracy is effectively improved, the height of the stator core under pressure can be detected, and the ballasted position of the stator 5 can be automatically compensated during press-fitting, which can reduce the influence of the stacking thickness of the stator core on the stator and rotor centering.

[0034] In some embodiments of the present invention, the lower limit of the ballast force in the pressure stop mode ensures that the pressure head does not stop without touching the core due to changes in the acceleration of the pressure head or interference from abnormal light objects during the press-fitting process. The recommended value is 100 Newtons. The upper limit ensures that the press-fitting force does not cause permanent deformation of the core. The recommended value is 20,000 Newtons. Considering that the core is composed of stacked punching sheets, the height deformation is reduced under stress. This pressure value is recommended to be 500-1000 Newtons. Therefore, the stack thickness c of the stator 5 in the housing 3 can be obtained in the first pressure stop mode. 1 , which is beneficial to reduce the influence of the stacking thickness of the stator core, thereby improving the accuracy of pressurizing the stator 5 to a predetermined position in the casing 3.

[0035] like Figure 2 As shown, according to the press-fitting method of the rotor 10 of the embodiment of the present invention, the rotor 10 is press-fitted on the rotor workbench 6, and the rotor workbench 6 includes a rotor loading station with a rotor base 7 and a rotor press-fitting station with a rotor shaft 8 and a rotor shaft base, wherein the rotor shaft base has an axial hole, and the rotor shaft 8 is penetrated through the rotor shaft base and abuts against the rotor workbench 6. The press-fitting method of the rotor 10 includes: S21, a plurality of rotors 10 are stacked on the rotor base 7 along the axial direction, and a stacking thickness c of the plurality of rotors 10 is obtained. 2 , the thickness b of the rotor base 7 2 ; S22, the rotor pressure head 9 ballasts the multiple rotors 10 placed on the rotor base 7, including: ballast by pressure stop mode; S23, obtain the displacement scale value X of the rotor pressure head 9 during the ballast of the rotor 10 2 ; S24, the rotor press head 9 grabs a single rotor 10 to the rotor press-fitting station and presses the rotor 10 onto the rotor shaft 8; S25, the second axial position includes the distance d between the center of the plurality of rotors 10 in the axial direction and the rotor worktable 6 2 , obtain the pressing variable Y of each rotor 10 at the rotor shrink fitting station n , where Y of the first to n-1th ballasted rotors 10 is n All meet: Y n =X 2 +Δ3,Δ3=(a 2 -b 2 -X 2 ) / 2+b 2 -d 2 + (n-1-(X n -1)*2)*c 2 / ne; Y of the nth ballasted rotor 10 n Satisfied: Y n =X 2 +Δ4, where Δ4=(a 2 -b 2 -X2 ) / 2+b 2 -d 2 + (n-1-(X n -1)*2)*( X 2 -b 2 ) / n, where n is the total number of rotor segments 10, X ,n is the number of times a single rotor 10 is pressed in the current segment. The distance between the rotor pressing head 9 and the rotor workbench 6 in the initial position is a 2 , e is a reserved deviation value. For example, the value range of e is between 0.1 mm and 1 mm, and this application does not impose any limitation.

[0036] like Figure 2 As shown, at the rotor loading station, from top to bottom, the multiple rotors 10 are numbered N1 to Nn in sequence, that is, after the rotor press 9 ballasts the multiple rotors 10, when the rotor press 9 transfers a single rotor 10, the order of transfer is from top to bottom in sequence, and after the transfer, after the multiple rotors 10 are press-fitted onto the rotor shaft 8, from top to bottom, the multiple rotors 10 are numbered Nn to N1 in sequence, that is, the first rotor 10 ballasted onto the rotor shaft 8 is N1, and the last rotor 10 ballasted onto the rotor shaft 8 is Nn. By satisfying the above conditions, each rotor 10 is more accurately ballasted onto the rotor shaft 8, thereby better reducing the influence of the stacking thickness of the rotors 10 on the centering of the rotors 10.

[0037] Therefore, according to the press-fitting method of the rotor 10 of the present invention, the rotor 10 can be better ballasted, and multiple rotors 10 can be ballasted to the predetermined position on the rotating shaft, the accuracy is effectively improved, the height of the multiple rotors 10 under pressure can be detected, and the ballasted positions of the multiple rotors 10 can be automatically compensated during press-fitting, which can reduce the influence of the stacking thickness of the multiple rotors 10 on the centring of the stator and rotor.

[0038] In some embodiments of the present invention, the lower limit of the ballast force in the pressure stop mode ensures that the pressure head does not stop without touching the core due to changes in the acceleration of the pressure head or interference from abnormal light objects during the press-fitting process. The recommended value is 100 Newtons. The upper limit ensures that the press-fitting force does not cause permanent deformation or breakage of the core and magnetic steel. The recommended value is 10,000 Newtons. Considering that the core is composed of stacked punching sheets, the height deformation is reduced under stress, and this pressure value is recommended to be 500-1000 Newtons. Therefore, the stacking thickness c of multiple stators 5 on the rotor shaft 8 can be obtained in the first pressure stop mode. 2 , which is beneficial to reduce the influence of the stacking thickness of the multiple rotors 10, thereby improving the accuracy of evenly pressurizing the multiple rotors 10 to the predetermined positions on the rotating shaft, thereby reducing the influence of the stacking thickness of the multiple rotors 10 on the centering of the stator and rotor.

[0039] In some embodiments of the present invention, the rotor 10 is axially spaced from the rotor shaft base, thereby better eliminating the influence of the rotor shaft base on the ballasting of the rotor 10 , so that each rotor 10 can be better ballasted onto the rotor shaft 8 .

[0040] like Figure 1-Figure 3 As shown, the method for axially aligning the stator and rotor cores according to an embodiment of the present invention includes: obtaining the axial position of the stator 5 in the casing 3 as the first axial position, obtaining the axial position of the rotor 10 on the rotor shaft 8 as the second axial position, and assembling the stator 5 and the rotor 10 according to the first axial position and the second axial position.

[0041] Specifically, S11, placing the stator 5 on the stator base 2, and obtaining the stacking thickness c of the stator 5 1 , the thickness b of the stator base 2 1 ; S12, the stator pressure head 4 ballasts the stator 5 placed on the stator base 2, including: ballast through the pressure stop mode; S13, obtain the displacement scale value X of the stator pressure head 4 during the stator 5 ballast process 1 ; S14, the stator pressure head 4 grabs the stator 5 to the stator shrink fitting station, and presses the stator 5 into the housing 3; S15, the first axial position includes the distance d between the center of the stator 5 in the axial direction and the stator workbench 1 1 , the press-fitting variable Y of stator 5 at the stator shrink-fit station 1 , where Y 1 Satisfied: Y 1 =X 1 +Δ1+Δ2, where the equipment and product model compensation Δ1=(b 1 + c 1 / 2) -d 1 , Δ2=-(X 1 -(b 1 +c 1 )) / 2.

[0042] S21, multiple rotors 10 are stacked on the rotor base 7 along the axial direction, and the stacking thickness c of the multiple rotors 10 is obtained. 2 , the thickness b of the rotor base 7 2 ; S22, the rotor pressure head 9 ballasts the multiple rotors 10 placed on the rotor base 7, including: ballast by pressure stop mode; S23, obtain the displacement scale value X of the rotor pressure head 9 during the ballast of the rotor 10 2 ; S24, the rotor press head 9 grabs a single rotor 10 to the rotor press-fitting station and presses the rotor 10 onto the rotor shaft 8; S25, the second axial position includes the distance d between the center of the plurality of rotors 10 in the axial direction and the rotor worktable 6 2 , obtain the pressing variable Y of each rotor 10 at the rotor shrink fitting stationn , where Y of the first to n-1th ballasted rotors 10 is n All meet: Y n =X 2 +Δ3,Δ3=(a 2 -b 2 -X 2 ) / 2+b 2 -d 2 + (n-1-(X n -1)*2)*c 2 / ne; Y of the nth ballasted rotor 10 n Satisfied: Y n =X 2 +Δ1+Δ4, where Δ4=(a 2 -b 2 -X 2 ) / 2+b 2 -d 2 + (n-1-(X n -1)*2)*( X 2 -b 2 ) / n, where n is the total number of rotor segments 10, X n is the number of press-fits of the current segment of a single rotor 10, a 2 is the distance between the rotor pressure head 9 and the rotor workbench 6 when it is in the initial position, and e is a reserved deviation value. For example, e is 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, etc., and this application does not impose any limitation.

[0043] Through the above method, since the first axial position and the second axial position can be accurately located and the position information can be effectively obtained, when the rotor 10 and the stator 5 are assembled, the rotor 10 and the stator 5 can be better aligned, thereby better reducing the poor state of centering (centering: the center of the stator 5 in the axial direction corresponds to the center of multiple rotors 10 in the axial direction), thereby improving the motor performance, reducing axial force fluctuations, and effectively increasing the bearing life and reducing noise.

[0044] According to the press-fitting method for axially aligning the stator and rotor cores in an embodiment of the present invention, when the rotor 10 and the stator 5 are assembled, the rotor 10 and the stator 5 can be better aligned, thereby effectively reducing the poor state of centering (centering: the axial center of the stator 5 corresponds to the axial centers of multiple rotors 10), thereby improving the performance of the motor, reducing axial force fluctuations, and effectively increasing the bearing life and reducing noise.

[0045] In some embodiments of the present invention, Figure 4As shown, at the rotor loading station, a magnetic isolation plate 11 is arranged between two adjacent rotors 10 in the axial direction, and the thickness of the magnetic isolation plate 11 in the axial direction is f. Then: the Y of the first to the n-1th ballasted rotors 10 n All meet: Y n =X 2 +Δ5,Δ5=(a 2 -b 2 -X 2 –(n-1)*f) / 2+b 2 -d 2 + (nX n )*f+(n-1-(X n -1)*2)*(c 2 -(n-1)*f) / ne; Y of the nth ballasted rotor 10 n Satisfied: Y n =X 2 +Δ6,Δ6=(a 2 -b 2 -X 2 –(n-1)*f) / 2+b 2 -d 2 +(n-1-(X n -1)*2)*( X 2 -b 2 -(n-1)*f) / n.

[0046] In the above example, the rotor 10 may be a pre-filled magnetic core, and the magnetic isolation plate 11 may effectively reduce interference between two adjacent rotors 10 .

[0047] Exemplarily, the magnetic isolation plate 11 may also be a protective plate for protection, which can reduce the damage between two adjacent rotors 10 during the rotor loading station.

[0048] By assembling the rotor 10 through the above logic, the rotor 10 and the stator 5 can be better aligned, thereby reducing the poor state of centering (centering: the axial center of the stator 5 corresponds to the axial centers of multiple rotors 10), thereby improving the motor performance, reducing axial force fluctuations, and effectively increasing the bearing life and reducing noise.

[0049] In some embodiments of the present invention, the distance d between the center of the stator 5 in the axial direction and the stator workbench 1 is 1 , the distance d between the center of the plurality of rotors 10 in the axial direction and the rotor worktable 6 2 , satisfy: d 1 =d 2+Δ7, Δ7 is the distance between the assembly surface of the housing and the motor cover and the shaft table surface of the rotor shaft. Thus, the control process in the above-mentioned press-fitting method can be reduced, and when the stator 5 and the rotor 10 are assembled, the centering state can be improved, thereby improving the motor performance, reducing the axial force fluctuation, and effectively increasing the bearing life and reducing the noise.

[0050] The axial centering press-fitting equipment for stator and rotor cores according to the present invention comprises: a stator workbench 1, a stator pressing head 4, a rotor workbench 6 and a rotor pressing head 9, wherein the stator workbench 1 comprises a stator loading station having a stator base 2 and a stator shrink-fitting station having a casing 3, the stator pressing head 4 is movably arranged above the stator workbench 1, and is used for pressing the stator 5 and transporting the stator 5, the rotor workbench 6 comprises a rotor loading station having a rotor base 7 and a rotor pressing station having a rotor shaft 8 and a rotor shaft base, wherein the rotor shaft base has an axial hole, the rotor shaft 8 is penetrated through the rotor shaft base and abuts against the rotor workbench 6, and the rotor pressing head 9 is movably arranged above the rotor workbench 6, and is used for pressing the rotor 10 and transporting the rotor 10.

[0051] According to the axial centering press-fitting equipment for stator and rotor cores of the embodiment of the present invention, when the rotor 10 and the stator 5 are assembled, the rotor 10 and the stator 5 can be better aligned, thereby effectively reducing the poor state of centering (centering: the axial center of the stator 5 corresponds to the axial centers of multiple rotors 10), thereby improving the performance of the motor, reducing axial force fluctuations, and effectively increasing the bearing life and reducing noise.

[0052] In some embodiments of the present invention, the press-fitting equipment for axial centering of the stator and rotor cores further includes a control center, which is used to control the actions of the stator press head 4 and the rotor press head 9, and is suitable for recording the displacement scale values ​​of the stator press head 4 and the rotor press head 9. Therefore, by setting up the control center, the automation of the press-fitting equipment can be improved, thereby freeing up manpower and improving the control accuracy of the press-fitting equipment.

[0053] Other structures and operations of the press-fitting device and the press-fitting method according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0054] In the description of this specification, the description with reference to the terms "some embodiments", "optionally", "further" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0055] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A method for press-fitting a stator, characterized in that: The stator is press-fitted on a stator workbench, the stator workbench comprises a stator loading station having a stator base and a stator shrink-fit station having a housing, and the stator press-fitting method comprises: S11, placing the stator on the stator base, and obtaining the stacking thickness c1 of the stator and the thickness b1 of the stator base; S12, the stator pressure head ballasts the stator placed on the stator base, including: ballasting in a pressure stop mode; S13, obtaining a displacement scale value X1 of the stator pressure head during the stator ballasting process; S14, the stator pressing head grabs the stator to the stator shrink fitting station, and presses the stator into the casing; S15. The first axial position includes the distance d1 between the axial center of the stator and the stator workbench, and the press-fitting variable Y1 of the stator at the stator shrink-fit station, wherein Y1 satisfies: Y1=X1+Δ1+Δ2, wherein the equipment and product model compensation amount Δ1=(b1+ c1 / 2)-d1, Δ2=-(X1-(b1+c1)) / 2.

2. The stator press-fitting method according to claim 1, characterized in that: The ballast force in the pressure stop mode is the friction force between the stator and the housing.

3. A method for press-fitting a rotor, characterized in that: The rotor is press-fitted on the rotor workbench, and the rotor workbench includes a rotor loading station having a rotor base and a rotor press-fitting station having a rotor shaft and a rotor shaft base, wherein the rotor shaft base has an axial hole, the rotor shaft is passed through the rotor shaft base and abuts against the rotor workbench, and the rotor press-fitting method includes: S21, stacking a plurality of rotors on the rotor base along the axial direction, and obtaining a stacking thickness c2 of the plurality of rotors and a thickness b2 of the rotor base; S22, the rotor pressure head performs ballasting on the plurality of rotors placed on the rotor base, including: performing ballasting in a pressure stop mode; S23, obtaining a displacement scale value X2 of the rotor pressure head during the rotor ballasting process; S24, the rotor pressing head grabs a single rotor to the rotor pressing station, and presses the rotor onto the rotor shaft; S25, the second axial position includes the distance d2 between the axial center of the plurality of rotors and the rotor workbench, and obtains the press-fitting variable Y of each rotor at the rotor shrink-fitting station. n ,in, Y of the first to n-1th ballasted rotors n All meet: Y n =X2+Δ3, Δ3=(a2-b2-X2) / 2+b2-d2 + (n-1-(X n -1)*2)*c2 / n-e; Y of the nth ballasted rotor n Satisfied: Y n =X2+Δ4, where Δ4=(a2-b2-X2) / 2+b2-d2 + (n-1-(Xn-1)*2)*(X2-b2) / n, Where n is the total number of rotor sections, X n is the number of press-fitting times of the current segment of a single rotor, a2 is the distance between the rotor press head and the rotor workbench when the rotor is in the initial position, and e is the reserved deviation value.

4. The rotor press-fitting method according to claim 3, characterized in that: The ballast force of the pressure stop mode is the friction force between the rotor and the rotor shaft.

5. The rotor press-fitting method according to claim 3, characterized in that: The rotor is axially spaced from the rotor shaft base.

6. The rotor press-fitting method according to claim 3, characterized in that: At the rotor loading station, a magnetic isolation plate is provided between two adjacent rotors in the axial direction, and the thickness of the magnetic isolation plate in the axial direction is f, then: Y of the first to n-1th ballasted rotors n All meet: Y n =X2+Δ5, Δ5=(a2-b2-X2–(n-1)*f) / 2+b2-d2+ (nX n )*f+(n-1-(X n -1)*2)*(c2-(n-1)*f) / ne; Y of the nth ballasted rotor n Satisfied: Y n =X2+Δ6,Δ6=(a2-b2-X2–(n-1)*f) / 2+b2-d2+ (n-1-(X n -1)*2)*( X2-b2-(n-1)*f) / n.

7. A method for press-fitting the axial centering of the stator and rotor cores, characterized in that: include: S1. According to the press-fitting method of the stator in claim 1 or 2, the axial position of the stator in the housing is obtained as a first axial position; S2. According to the rotor press-fitting method according to any one of claims 3 to 5, the axial position of the rotor on the rotor shaft is obtained as a second axial position; S3. According to the first axial position and the second axial position, assemble the stator and the rotor.

8. The method for press-fitting the stator and rotor cores with axial centering according to claim 7, characterized in that: The distance d1 between the axial center of the stator and the stator worktable, and the distance d2 between the axial centers of the multiple rotors and the rotor worktable satisfy: d1=d2+Δ7, Δ7 is the distance between the assembly surface of the casing and the motor cover to the shaft table surface of the rotor shaft.

9. A press-fitting device for axial centering of stator and rotor cores, characterized in that: include: A stator workbench, the stator workbench comprising a stator loading station having a stator base and a stator shrink-fit station having a housing; A stator pressing head, which is movably arranged above the stator workbench and is used for pressing and installing the stator and transporting the stator; A rotor workbench, the rotor workbench comprising a rotor loading station having a rotor base and a rotor pressing station having a rotor shaft and a rotor shaft base, wherein the rotor shaft base has an axial hole, the rotor shaft is passed through the rotor shaft base and abuts against the rotor workbench; A rotor pressing head is movably arranged above the rotor workbench and is used for pressing and installing the rotor and transporting the rotor.

10. The press-fitting equipment for axial centering of stator and rotor cores according to claim 9, characterized in that: It also includes a control center, which is used to control the actions of the stator pressure head and the rotor pressure head, and is suitable for recording the displacement scale values ​​of the stator pressure head and the rotor pressure head.

Images