Sectional type motor rotor skewed pole assembly structure and method

Abstract

The invention relates to the technical field of motor rotor assembly, in particular to a sectional type motor rotor skewed pole assembly structure and method. In order to solve the problem that many defects exist in an existing electrode rotor skewed pole assembly method, the invention provides a novel sectional type motor rotor skewed pole assembly structure. Comprising a rotor part, a dummy shaft tool, a positioning and pressing tool, a transmission end rotor pressing ring provided with a transmission key groove, a non-transmission end rotor pressing ring provided with a non-transmission key groove, and a hollow shaft adaptively connected with the inner circumferential surface of the rotor part. According to the structure, through the cooperation of the dummy shaft tool and the positioning and pressing tool, the realization of the skewed pole process of the sectional motor rotor is ensured, meanwhile, a mounting foundation and a positioning foundation are provided for the assembly of the hollow shaft and the sectional motor rotor part, and then the assembly of the hollow shaft and the rotor part is realized through the liquid nitrogen freezing and heating heat preservation process; and the assembly of the hollow shaft and the segmented motor rotor skewed pole is solved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of motor rotor assembly, in particular to a segmented motor rotor skew pole assembly structure and method. BACKGROUND

[0002] Permanent magnet motors have many advantages such as high efficiency, high power density, high torque density, etc., and play an important role in new energy and rail transit equipment. However, due to the non-sinusoidal nature of the magnetic field of the permanent magnet synchronous motor and the influence of the stator tooth slot effect, a large torque fluctuation and noise will be generated when the rotor rotates along the circumferential direction. Torque fluctuation is an important indicator affecting the performance of the permanent magnet motor. Torque fluctuation can cause motor jitter, electromagnetic vibration and noise, affect control accuracy, and even cause performance degradation or control failure in severe cases. Rotor segmentation and pole error are one of the most effective measures to reduce torque fluctuation of permanent magnet motors. In order to eliminate tooth slot torque and torque fluctuation, or to weaken the influence of air gap harmonics, etc., in favor of smooth control and operation of the motor, the rotor skew pole technology is often introduced. The skew pole of the rotor is to make the magnetic steel or permanent magnet of the upper and lower segments of the rotor core have a small angle in the circumferential direction, so as to achieve the purpose of smoothing the sharp change of the magnetic field.

[0003] At present, the common motor rotor structure is that the rotor stamping and the key groove on the shaft are connected with each other through the key to ensure the skew pole between the rotor segments. However, the method of opening the key groove on the rotating shaft is only suitable for solid shafts that meet the design strength. For hollow shafts with limited wall thickness, it is not possible to open the key groove on the rotating shaft to ensure the design strength.

[0004] For example, patent CN114552825A "Segmented skew pole permanent magnet motor rotor manufacturing method and structure" adopts inner and outer two-layer hole misalignment riveting design. The pre-set skew pole angle is positioned by reasonably pre-setting the key groove and riveting space. The assembly positioning precision of the segmented skew pole is ensured by the stamping precision, but the misalignment riveting process is required in this method, and the assembly is complex.

[0005] For example, patent CN114884287A "Motor rotor core skew pole press-fitting method and structure" sets a pressure sleeve assembly on a press, and uses the axial movement of the press to push the pressure sleeve assembly and the current rotor core piece to move axially until the current rotor core piece is pressed to the target position on the rotor shaft, thereby realizing the skew pole angle between the rotor core pieces. This assembly method is simple and convenient, but for the rotor segments filled with permanent magnets, there is a large magnetic force between the segments. During the pushing assembly process, the rotor will rotate under the action of the force, and it is easy for the rotor segment to rotate before it is pushed to the target position, so the skew pole angle cannot be guaranteed. Therefore, this method is not suitable for the assembly process when there are many rotor segments and the magnetic force is large. SUMMARY

[0006] The present application provides a new segmented motor rotor skew pole assembly structure and method to solve the problems of many defects in the existing electrode rotor skew pole assembly method.

[0007] The present application is implemented by adopting the following technical solutions: A segmented motor rotor skew pole assembly structure, comprising a rotor part, a dummy shaft tool, a positioning and pressing tool, a transmission end rotor pressing ring provided with a transmission key groove, a non-transmission end rotor pressing ring provided with a non-transmission key groove, and a hollow shaft adaptively connected to the inner circumferential surface of the rotor part; The rotor part comprises a plurality of first rotor segments and a plurality of second rotor segments, each first rotor segment is formed by self-adhesion of a plurality of first rotor laminations, each first rotor segment is provided with a first key groove, the center line of the first key groove is consistent with the center line of the inner circle of the first rotor lamination, each second rotor segment is formed by self-adhesion of a plurality of second rotor laminations, and each second rotor segment is provided with a second key groove, and a deflection angle is provided between the center line of the second key groove and the center line of the inner circle of the second rotor lamination; The dummy shaft tool comprises a dummy shaft adaptively connected to the inner circumferential surface of the rotor part, the inner circumferential surface of the transmission end rotor pressing ring, and the inner circumferential surface of the non-transmission end rotor pressing ring, the dummy shaft is provided with an axial key groove, the axial key groove is adaptively provided with a shaft key, and the shaft key is adaptively connected to the first key groove, the second key groove, the transmission key groove, and the non-transmission key groove; The positioning and pressing tool comprises an upper and lower pressing ring plate and a bottom ring plate, a plurality of pull rods, and a plurality of pressing screw sleeves, one end of each of the plurality of pull rods is circumferentially and uniformly installed on the upper surface of the bottom ring plate, the upper pressing ring plate is circumferentially and uniformly provided with a plurality of through holes adaptively connected to the pull rods, the other end of each of the plurality of pull rods is slid through the plurality of through holes and then screwed to the pressing screw sleeve, thereby achieving axial positioning and pressing of the pressing ring plate and the bottom ring plate, the inner circle of the bottom ring plate is adaptively connected to the outer circumferential surface of the transmission end rotor pressing ring, a lower stop structure is provided between the inner edge of the upper surface of the bottom ring plate and the outer circumferential surface of the upper end of the transmission end rotor pressing ring, the inner circle of the pressing ring plate is adaptively connected to the outer circumferential surface of the non-transmission end rotor pressing ring, and an upper stop structure is provided between the inner edge of the lower surface of the pressing ring plate and the outer circumferential surface of the lower end of the non-transmission end rotor pressing ring.

[0008] Further, each first rotor lamination and each second rotor lamination is provided with an anti-reverse assembly mark, which facilitates identification of the correct assembly and reverse assembly of the rotor lamination.

[0009] Further, the anti-reverse assembly mark is a lug groove extending away from the center in the radial direction at one end of the first key groove and the second key groove, which is structured and standardized, and facilitates identification of the correct assembly and reverse assembly of the rotor lamination.

[0010] Further, the first rotor segment is four, the second rotor segment is two, the thickness of the first rotor segment and the second rotor segment is the same, the rotor part is sequentially installed from bottom to top in the order of the first rotor segment, the second rotor segment, the first rotor segment, the first rotor segment, the second rotor segment, and the first rotor segment, the front two rotor segments are installed in the forward direction, and the middle two rotor segments are installed in the reverse direction, so as to form a segmented rotor inclined pole assembly structure in the shape of V.

[0011] Further, the pull rod is four, the compression sleeve is four, and the through hole is four.

[0012] A segmented motor rotor inclined pole assembly method is realized by the segmented motor rotor inclined pole assembly device described above, and the specific assembly method includes the following steps: 1) installing the positioning base: the transmission end rotor compression ring is sleeved on the bottom ring plate, the dummy shaft is installed on the transmission end rotor compression ring, and the shaft key is installed in the transmission key groove and the axial key groove; 2) installing the rotor part: a plurality of first rotor segments and second rotor segments are installed according to the set inclined pole arrangement mode; 3) the non-transmission end rotor compression ring is assembled on the dummy shaft through the shaft key and the non-transmission key groove and is compressed on the rotor part; 4) the compression ring plate is sleeved on the non-transmission end rotor compression ring and is compressed on the rotor part, and then the compression ring plate is compressed on the rotor part by sleeving the sleeve on the pull rod and tightening, so that the rotor part is compressed by the positioning and compression tool; 5) knock the dummy shaft, and take out the dummy shaft; 6) place the rotor part compressed by the positioning and compression tool in the oven for heating and heat preservation, and place the hollow shaft in the heat preservation box for liquid nitrogen freezing; 7) take out the heated rotor part compressed by the positioning and compression tool and the frozen hollow shaft, and insert the hollow shaft into the rotor part from the transmission end rotor compression ring or the non-transmission end rotor compression ring; 8) after the hollow shaft returns to room temperature, the hollow shaft and the rotor part are assembled in interference fit, and the positioning and compression tool is removed at this time, so as to complete the segmented motor rotor inclined pole assembly.

[0013] The application discloses a segmented motor rotor skew pole assembly method, which is realized by a segmented motor rotor skew pole assembly device. Figure 10

[0014] Further, in step 2), during the installation process, an oil press is used to press the first rotor segment and the first rotor segment that have been installed on the dummy shaft, so that the rotor segments installed on the dummy shaft are as integrated as possible, the distance between the rotor segments is shortened, and axial operation space is provided for the installation of subsequent rotor segments.

[0015] Further, in step 4), after the pressing ring plate is pressed on the rotor part, an oil press is used to give a pressing force of the pressing ring plate, the given pressure is 180KN, the pressing ring plate and the bottom ring plate can be used to tighten the rotor part, and the positioning and pressing of the rotor part are guaranteed.

[0016] Further, in step 6), the heating temperature of the rotor part placed in the oven is 120 DEG C, the heat preservation time is greater than or equal to 1.5 hours, the hollow shaft is subjected to liquid nitrogen freezing for greater than or equal to 20 minutes, and the process is specific and standardized, so that the interference fit effect is guaranteed.

[0017] Further, in step 7), after the hollow shaft is inserted into the rotor part, an oil press is used to pressurize the rotor part again, the given pressure is 180KN, and the pressure maintaining time is greater than or equal to 30 minutes, so that the pressing of the rotor part is further guaranteed, and the assembly quality is improved.

[0018] ​The beneficial effects generated by the application are as follows: the segmented motor rotor skew pole assembly structure and method of the application ensures the realization of the segmented motor rotor skew pole process through the cooperation of the false shaft tooling and the positioning and pressing tooling, can better weaken the adverse effects of tooth harmonic and torque fluctuation, and provides installation and positioning bases for the assembly of the hollow shaft and the segmented motor rotor part, and then realizes the assembly of the hollow shaft and the rotor part through the liquid nitrogen freezing and heating preservation process, not only realizes the lightweight design of the part, reduces the weight of the whole machine, but also solves the assembly of the hollow shaft and the segmented motor rotor skew pole. BRIEF DESCRIPTION OF DRAWINGS

[0019] The drawings incorporated into the specification and forming a part thereof show embodiments consistent with the present application and, together with the description, serve to explain the principles of the application.

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows, and obviously, other drawings can also be obtained by those skilled in the art without creative labor under the premise of not paying the creative labor.

[0021] Figure 1 It is a structural schematic diagram of the first rotor punching sheet; Figure 2 It is a structural schematic diagram of the second rotor punching sheet; Figure 1 It is a partial enlarged schematic diagram of A in the figure; Figure 3 It is a structural schematic diagram of the second rotor punching sheet; Figure 4 It is a structural schematic diagram of the second rotor punching sheet; Figure 2 It is a partial enlarged schematic diagram of B in the figure; Figure 5 It is a structural schematic diagram of the false shaft; Figure 6 It is a structural schematic diagram of the positioning and pressing tooling; Figure 7 It is a structural schematic diagram of the assembly of the false shaft, the positioning and pressing tooling, the rotor part, the non-driving end rotor pressing ring and the driving end rotor pressing ring, i.e. the structural schematic diagram after step 4) of the completed assembly method; Figure 8 It is a half-section schematic diagram of the figure; Figure 7 Figure 9 It is a partial enlarged schematic diagram of C in the figure; Figure 7 It is a partial enlarged schematic diagram of C in the figure; Figure 10 Figure 7 It is a partial enlarged schematic diagram of D in the figure; Figure 11 It is a structural schematic diagram of the hollow shaft; Figure 12 ​​The structure schematic diagram after the step 8) of the assembling method is completed. Figure 13 The structure schematic diagram after the step 8) of the assembling method is completed. Figure 12 The structure schematic diagram after the step 8) of the assembling method is completed. Figure 14 The structure schematic diagram after the step 8) of the assembling method is completed.

[0022] In the figure: 1-first rotor segment, 2-second rotor segment, 3-first key groove, 4-second key groove, 5-pseudo-shaft, 6-pressing ring plate, 7-bottom ring plate, 8-pull rod, 9-sleeve, 10-upper stop structure, 11-lower stop structure, 12-anti-reverse assembly mark, 13-transmission end rotor pressing ring, 14-non-transmission end rotor pressing ring, 15-hollow shaft. DETAILED DESCRIPTION

[0023] In order to enable the above object, features and advantages of the present application to be clearer, the following will further describe the schemes of the present application. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0024] In the description, it should be noted that the terms “first”, “second” are only for the purpose of description, and cannot be understood as indicating or implying relative importance. It should be noted that, unless otherwise explicitly specified and limited, the terms “mounting”, “connection”, “connecting” should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, and can be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms can be understood according to the specific circumstances.

[0025] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, but the present application can also be implemented in other ways different from those described herein; obviously, the examples in the description are only some of the embodiments of the present application, not all the embodiments.

[0026] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0027] A segmented motor rotor skew pole assembly structure, comprising a rotor part, a pseudo-shaft tool, a positioning and pressing tool, a transmission end rotor pressing ring 13 provided with a transmission key groove, a non-transmission end rotor pressing ring 14 provided with a non-transmission key groove, and a hollow shaft adaptedly connected with the inner circumferential surface of the rotor part, as shown in Figure 11 . The rotor part comprises a plurality of first rotor segments 1 and a plurality of second rotor segments 2, each first rotor segment 1 is formed by a plurality of first rotor laminations being self-bonded, each first rotor segment 1 is provided with a first key groove 3, the center line of the first key groove 3 is consistent with the center line of the inner circle of the first rotor lamination as shown in Figure 1 、 2 , each second rotor segment 2 is formed by a plurality of second rotor laminations being self-bonded, each second rotor segment 2 is provided with a second key groove 4, and a deflection angle is provided between the center line of the second key groove 4 and the center line of the inner circle of the second rotor lamination as shown in Figure 3 、 4 ; As shown in Figure 5 , the dummy shaft tooling comprises a dummy shaft 5 which is adapted to the rotor part, the inner circumferential surface of the transmission end rotor pressure ring 13 and the inner circumferential surface of the non-transmission end rotor pressure ring 14, the dummy shaft 5 is provided with an axial key groove, and an axial key is adapted to the axial key groove, and the axial key is adapted to the first key groove 3, the second key groove 4, the transmission key groove and the non-transmission key groove; As shown in Figure 6 、 8 , 9, 10, the positioning and pressing tooling comprises an upper and lower arranged pressure ring plate 6 and bottom ring plate 7, a plurality of pull rods 8 and a plurality of pressing nuts 9, one end of the plurality of pull rods 8 is circumferentially uniformly arranged on the upper surface of the bottom ring plate 7, the pressure ring plate 6 is circumferentially uniformly provided with a plurality of through holes adapted to the pull rods 8, the other end of the plurality of pull rods 8 is respectively and slidably arranged through the plurality of through holes and then screwed to the pressing nuts 9, so as to realize the axial positioning and pressing of the pressure ring plate 6 and the bottom ring plate 7, the inner circle of the bottom ring plate 7 is adapted to the outer circumferential surface of the transmission end rotor pressure ring 13, and a lower stop structure 11 is provided between the inner edge of the upper surface of the bottom ring plate 7 and the outer circumferential surface of the upper end of the transmission end rotor pressure ring 13, the inner circle of the pressure ring plate 6 is adapted to the outer circumferential surface of the non-transmission end rotor pressure ring 14, and an upper stop structure 10 is provided between the inner edge of the lower surface of the pressure ring plate 6 and the outer circumferential surface of the lower end of the non-transmission end rotor pressure ring 14.

[0028] In the specific embodiment, each first rotor lamination and each second rotor lamination is provided with an anti-reverse installation mark 12, which facilitates the identification of the correct installation and reverse installation of the rotor lamination.

[0029] In the specific embodiment, the anti-reverse installation mark 12 is a lug groove extending in a radial direction away from the center at one end of the first key groove 3 and the second key groove 4, which is structured and standardized, and facilitates the identification of the correct installation and reverse installation of the rotor lamination.

[0030] In the embodiment, the first rotor segment 1 is four, the second rotor segment 2 is two, the thickness of the first rotor segment 1 and the second rotor segment 2 is the same, and the installation sequence of the rotor part from bottom to top is the first rotor segment 1, the second rotor segment 2, the first rotor segment 1, the first rotor segment 1, the second rotor segment 2, and the first rotor segment 1. The front two rotor segments are installed in the positive direction, and the middle two rotor segments are installed in the reverse direction, so as to form a segmented rotor inclined pole assembly structure in the shape of V.

[0031] In the embodiment, the pull rod 8 is four, the compression sleeve 9 is four, and the through hole is four.

[0032] A segmented motor rotor inclined pole assembly method is realized by the segmented motor rotor inclined pole assembly device described above, and the specific assembly method includes the following steps: 1) installing the positioning base: the transmission end rotor pressing ring 13 is sleeved on the bottom ring plate 7, the dummy shaft 5 is installed in the transmission end rotor pressing ring 13, and the shaft key is installed in the transmission key groove and the axial key groove; 2) installing the rotor part: the installation sequence of the rotor part is the first rotor segment 1, the second rotor segment 2, the first rotor segment 1, the first rotor segment 1, the second rotor segment 2, and the first rotor segment 1. The front two rotor segments are installed in the positive direction, and the middle two rotor segments are installed in the reverse direction; 3) the non-transmission end rotor pressing ring 14 is assembled on the dummy shaft 5 through the shaft key and the non-transmission key groove and is pressed on the rotor part; 4) the compression ring plate 6 is sleeved on the non-transmission end rotor pressing ring 14 and is pressed on the rotor part, and then the sleeve 9 is sleeved on the pull rod 8 and is tightened, so that the rotor part is pressed by the positioning and pressing tool, as shown in Figure 7 and 8 ; 5) in the embodiment, since the diameter of the non-transmission end rotor pressing ring 14 is greater than the inner diameter of the transmission end rotor pressing ring 13, the diameters of the two ends of the dummy shaft 5 are different, so the rotor part pressed by the positioning and pressing tool needs to be turned over, the non-transmission end rotor pressing ring is arranged downward, and then the dummy shaft 5 is tapped lightly and taken out; 6) the rotor part pressed by the positioning and pressing tool is placed in an oven for heating and heat preservation, and the hollow shaft is placed in a heat preservation box for liquid nitrogen freezing; 7) the rotor part heated after being pressed by the positioning and pressing tool and the hollow shaft frozen after being cooled are taken out, and the hollow shaft is inserted into the rotor part from the transmission end rotor pressing ring 13 or the non-transmission end rotor pressing ring 14; 8) after the hollow shaft 15 returns to the normal temperature state, the hollow shaft 15 and the rotor part are assembled in an interference fit, as shown in Figure 12 , 13 ; at this time, the positioning and pressing tool is removed, so as to complete the segmented motor rotor inclined pole assembly, and the assembly effect is shown in Figure 14 ; the surface of the iron core is in the shape of a “V” line, which is caused by the deflection angle α, that is, the effect of the rotor inclined pole.

[0033] In the embodiment, in step 2), the rotor part is pressed by an oil press during installation, so that the rotor segments already installed on the dummy shaft 5 are as much as possible to be pressed into one body, the distance between the rotor segments is shortened, and axial operation space is provided for the installation of the subsequent rotor segments.

[0034] In the embodiment, in step 4), after the pressing ring plate 6 is pressed on the rotor part, the oil press is used to give a pressure to the pressing ring plate 6, the given pressure is 180 KN, so that the pressing ring plate 6 and the bottom ring plate 7 can pull the rotor part tightly, and the positioning and pressing of the rotor part are ensured.

[0035] In the embodiment, in step 6), the heating temperature of the rotor part in the oven is 120 DEG C, the holding time is greater than or equal to 1.5 h, the hollow shaft is frozen by liquid nitrogen for greater than or equal to 20 min, and the process is specified and standardized, so that the interference fit effect is ensured.

[0036] In the embodiment, in step 7), after the hollow shaft 15 is inserted into the rotor part, the oil press is used to press the rotor part again, the given pressure is 180 KN, the holding time is greater than or equal to 30 min, the pressing of the rotor part is further ensured, and the assembly quality is improved.

[0037] The above description is only the embodiment of the present application, which enables those skilled in the art to understand or implement the present application. Although the foregoing embodiments are described in detail, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments, and they should be covered in the protection scope of the claims.

Claims

1. A segmented motor rotor skew-pole assembly structure, characterized in that, It includes a rotor section, a dummy shaft tooling, a positioning and clamping tooling, a transmission end rotor pressure ring (13) with a transmission keyway thereon, a non-transmission end rotor pressure ring (14) with a non-transmission keyway thereon, and a hollow shaft (15) that is adapted to and connected to the inner circumferential surface of the rotor section. The rotor section includes several first rotor segments (1) and several second rotor segments (2). Each first rotor segment (1) is formed by self-bonding multiple first rotor laminations. Each first rotor segment (1) is provided with a first keyway (3). The center line of the first keyway (3) is consistent with the center line of the inner circle of the first rotor lamination. Each second rotor segment (2) is formed by self-bonding multiple second rotor laminations. Each second rotor segment (2) is provided with a second keyway (4). The center line of the second keyway (4) is provided with a deflection angle between the center line of the second keyway (4) and the center line of the inner circle of the second rotor lamination. The dummy shaft tooling includes a dummy shaft (5) that is compatible with the inner circumferential surface of the rotor part, the rotor pressure ring (13) at the transmission end, and the inner circumferential surface of the rotor pressure ring (14) at the non-transmission end. The dummy shaft (5) is provided with an axial keyway, and a shaft key is adapted to the axial keyway. The shaft key is compatible with the first keyway (3), the second keyway (4), the transmission keyway, and the non-transmission keyway. The positioning and clamping fixture includes a pressure ring plate (6) and a bottom ring plate (7) arranged vertically, multiple tie rods (8), and multiple clamping screw sleeves (9). One end of each tie rod (8) is circumferentially evenly distributed on the upper surface of the bottom ring plate (7). The pressure ring plate (6) has multiple through holes circumferentially evenly distributed to fit the tie rods (8). The other end of each tie rod (8) slides up and down through the multiple through holes and is then tightened into the clamping screw sleeves (9), thereby achieving axial positioning and clamping between the pressure ring plate (6) and the bottom ring plate (7). The inner ring of the bottom ring plate (7) is adapted to the outer circumferential surface of the transmission end rotor pressure ring (13). The inner edge of the upper surface of the bottom ring plate (7) is provided with a lower stop structure (11) between the outer circumferential surface of the upper end of the transmission end rotor pressure ring (13). The inner ring of the pressure ring plate (6) is adapted to the outer circumferential surface of the non-transmission end rotor pressure ring (14). The inner edge of the lower surface of the pressure ring plate (6) is provided with an upper stop structure (10) between the outer circumferential surface of the lower end of the non-transmission end rotor pressure ring (14).

2. The segmented motor rotor skew-pole assembly structure according to claim 1, characterized in that, Each first rotor lamination and each second rotor lamination are provided with anti-reverse mounting markings (12).

3. The segmented motor rotor skew-pole assembly structure according to claim 2, characterized in that, The anti-reverse mounting mark (12) is a lug groove that extends radially away from the center at one end of the first keyway (3) and the second keyway (4).

4. The segmented motor rotor skew-pole assembly structure according to claim 3, characterized in that, There are four first rotor segments (1) and two second rotor segments (2). The first rotor segments (1) and the second rotor segments (2) have the same thickness. The rotor parts are installed in the following order from bottom to top: first rotor segment (1), second rotor segment (2), first rotor segment (1), first rotor segment (1), second rotor segment (2), first rotor segment (1). The first two rotor segments are installed in the same direction as the last two rotor segments, and the middle two rotor segments are installed in opposite directions.

5. The segmented motor rotor skew-pole assembly structure according to claim 3, characterized in that, There are four pull rods (8), four clamping screw sleeves (9), and four through holes.

6. A method for assembling a segmented motor rotor with skewed poles, implemented using the segmented motor rotor skewed pole assembly device as described in claim 1, characterized in that, The steps include: 1) Installing the positioning base: The inner ring (13) of the transmission end rotor is fitted onto the bottom ring plate (7), the dummy shaft (5) is installed inside the transmission end rotor ring (13), and the shaft key is installed in the transmission keyway and the axial keyway; 2) Installing the rotor part: Multiple first rotor segments (1) and second rotor segments (2) are installed according to the set oblique pole arrangement; 3) The non-transmission end rotor ring (14) is guided and assembled onto the dummy shaft (5) through the shaft key and the non-transmission keyway and pressed onto the rotor part; 4) The ring plate (6) is fitted onto the non-transmission end rotor. Press the pressure ring (14) onto the rotor part, and then tighten the screw sleeve (9) on the pull rod (8) so that the rotor part is pressed by the positioning and pressing fixture; 5) tap the dummy shaft (5) lightly and take out the dummy shaft (5); 6) place the rotor part pressed by the positioning and pressing fixture in the oven for heating and heat preservation, and place the hollow shaft in the heat preservation box for liquid nitrogen freezing; 7) take out the heated rotor part pressed by the positioning and pressing fixture and the frozen hollow shaft, and insert the hollow shaft into the rotor part from the rotor pressure ring (13) at the transmission end or the rotor pressure ring (14) at the non-transmission end; 8) After the hollow shaft (15) returns to normal temperature, the hollow shaft (15) and the rotor are assembled with an interference fit. At this time, the positioning and clamping fixture is removed, thereby completing the assembly of the segmented motor rotor skew pole.

7. A method for assembling a segmented motor rotor with skewed poles, implemented using a segmented motor rotor skewed pole assembly device as described in claim 2, 3, 4, or 5, characterized in that, The steps include: 1) Installing the positioning base: Fit the inner ring (13) of the transmission end rotor into the bottom ring plate (7), install the dummy shaft (5) inside the transmission end rotor ring (13), and install the shaft key in the transmission keyway and the axial keyway; 2) Installing the rotor: The installation sequence of the rotor is as follows: first rotor segment (1), second rotor segment (2), first rotor segment (1), first rotor segment (1), second rotor segment (2), first rotor segment (1). The first two rotor segments and the last two rotor segments are installed in the forward direction, and the middle two rotor segments are installed in the reverse direction; 3) Assemble the non-transmission end rotor ring (14) onto the dummy shaft (5) through the shaft key and the non-transmission keyway guide. 4) Place the pressure ring plate (6) on the non-drive end rotor pressure ring (14) and press it onto the rotor part. Then, by fitting the screw sleeve (9) onto the pull rod (8) and tightening it, the rotor part is pressed by the positioning and pressing fixture. 5) Tap the dummy shaft (5) lightly and remove the dummy shaft (5). 6) Place the rotor part pressed by the positioning and pressing fixture in an oven for heating and heat preservation, and place the hollow shaft in an insulation box for liquid nitrogen freezing. 7) Take out the heated rotor part pressed by the positioning and pressing fixture and the frozen hollow shaft (15), and insert the hollow shaft (15) into the rotor part from the drive end rotor pressure ring (13) or the non-drive end rotor pressure ring (14). 8) After the hollow shaft (15) returns to normal temperature, the hollow shaft (15) and the rotor are assembled with an interference fit. At this time, the positioning and clamping fixture is removed, thereby completing the assembly of the segmented motor rotor skew pole.

8. The method for assembling a segmented motor rotor with skewed poles according to claim 7, characterized in that, In step 2), during the installation of the rotor section, a hydraulic press is used to apply pressure to the first rotor section (1) and the first rotor section (2) that have been installed on the dummy shaft (5), so that the rotor sections that have been installed on the dummy shaft (5) are pressed into one piece as much as possible, shortening the distance between the rotor sections and providing axial operating space for the installation of subsequent rotor sections.

9. A method for assembling a segmented motor rotor with skewed poles according to claim 8, characterized in that, In step 4), after pressing the pressure ring plate (6) onto the rotor, the pressure of the pressure ring plate (6) is given by the hydraulic press. The pressure is 180KN to ensure that the pressure ring plate (6) and the bottom ring plate (7) can tighten the rotor.

10. A method for assembling a segmented motor rotor with skewed poles according to claim 9, characterized in that, In step 6), the rotor is placed in an oven at a temperature of 120°C for ≥1.5h, and the hollow shaft is frozen in liquid nitrogen for ≥20min.

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