Rotor lamination, segmented skewed pole motor rotor and motor

Abstract

The application provides a rotor lamination, a motor rotor with segmented skew poles and a motor. The rotor lamination comprises a lamination body, an even number of magnetic steel fixing grooves, a plurality of magnets forming a plurality of magnetic pole center lines with alternating polarities, at least three first positioning through holes with a diameter d1, two of which are located on a first magnetic pole center line, and the other is located on a second magnetic pole center line, the first and second magnetic pole center lines are two magnetic pole center lines with different polarities, at least three second positioning through holes with a diameter d2, two of which are located on a first offset line and a second offset line respectively, the first and second offset lines are located on both sides of a third magnetic pole center line, and the other is located on a fourth magnetic pole center line. The application can use the rotor lamination manufactured by the same mold and realize the segmented skew poles of the rotor without turning the core.

Description

Technical Field

[0001] This application belongs to the field of electric motor technology, and particularly relates to a rotor and motor rotor with rotor laminations and segmented skewed poles. Background Technology

[0002] Permanent magnet synchronous motors (PMSMs) are used in the field of servo motors to greatly improve the power density and efficiency of the motor. However, due to the cogging effect and the non-sinusoidal nature of the magnetic field, PMSMs are often accompanied by large tooth harmonic potentials, cogging torque, and torque pulsation, which greatly affect the control accuracy of the motor and limit its application in high-quality servo systems.

[0003] To improve the control accuracy of motors, stator skew and rotor skew are the main methods used. Rotor skew is broadly divided into two categories: continuous skew and segmented skew. Segmented rotor skew not only has better tooth harmonic potential, harmonic reduction, and cogging torque reduction effects, but also helps reduce the processing and production costs of magnets, making it suitable for mass production and attracting much attention.

[0004] To achieve segmented skewed stages in the rotor core, multiple sets of molds are typically used to process the rotor core, resulting in rotor cores with different angles to realize the skewed stage structure of the rotor. For example... Figure 1 As shown, the motor rotor comprises six rotor cores, each machined using two sets of molds. Rotor core 1+ and rotor core 1- are machined from the same set of molds, differing only in that they are rotated 180 degrees apart. Rotor core 2 is machined from a separate set of molds. When the rotor cores are stacked together to form the motor rotor, the skew angles of rotor core 1+ and rotor core 1- differ by 2α, and the skew angles of rotor core 1+ and rotor core 2 differ by α. Figure 2 As shown, the rotating shaft has symmetrically arranged keyways 1, which are used to connect the various iron cores as follows: Figure 1 The pattern shown is used to install the rotating shaft to achieve segmented skewed poles.

[0005] In the above scheme, two sets of molds need to be designed to manufacture the two types of rotor cores. Furthermore, rotor core 1+ and rotor core 1- need to be rotated 180°. When the rotor cores are stacked together, gaps can easily form between them. This is because the burr surfaces are all on the same side of the core; after the cores are rotated, the burr surfaces of two adjacent cores will come together, potentially creating gaps. Additionally, a double keyway needs to be created on the shaft, increasing the design complexity of the shaft and the cost of mold making. Summary of the Invention

[0006] This application aims to at least solve one of the technical problems existing in the prior art. To this end, this application proposes a rotor rotor with rotor laminations, segmented skewed poles, and a motor.

[0007] One objective of this application is to improve the versatility of rotor laminations, so as to achieve the goal of manufacturing the rotor core of the motor rotor using only the same rotor lamination die.

[0008] Another objective of this application is to provide a structural form of a motor rotor that can realize multi-segment skewed poles.

[0009] A further objective of this application is to avoid flipping the motor rotor, ensuring that the burr surfaces of each rotor core are in the same direction, and to prevent gaps from forming when multiple rotor cores are stacked.

[0010] A further objective of this application is to simplify the machining of the shaft and reduce the cost of the motor.

[0011] In a first aspect, this application provides a rotor lamination, comprising:

[0012] Film processing body;

[0013] An even number of magnet fixing slots are evenly arranged on the outer periphery of the lamination body;

[0014] Multiple magnets, including an equal number of N-pole magnets and S-pole magnets, are alternately installed in the magnet fixing slot to form multiple magnetic pole center lines composed of an equal number of N-pole magnetic pole center lines and S-pole magnetic pole center lines.

[0015] At least three first positioning through holes with a diameter of d1, two of which are located on the center line of the first magnetic pole and the other is located on the center line of the second magnetic pole. The first and second magnetic pole centers are two magnetic pole centers with different polarities among multiple magnetic pole centers.

[0016] At least three second positioning through holes with a diameter of d2, where d2 < d1, two of which are respectively located on the first offset line and the second offset line. The first offset line and the second offset line are straight lines that penetrate the center of the lamination body and are located on both sides of the third magnetic pole center line, forming an angle with the third magnetic pole center line with the same preset angle. The third magnetic pole center line is one of multiple magnetic pole center lines and is different from the first magnetic pole center line and the second magnetic pole center line. The other second positioning through hole is located on the fourth magnetic pole center line. The fourth magnetic pole center line is one of multiple magnetic pole center lines, different from the first magnetic pole center line and the second magnetic pole center line, and has the opposite polarity to the third magnetic pole center line.

[0017] According to one embodiment of this application, the number of magnet fixing slots is 2n, where n is an integer greater than or equal to 4.

[0018] According to one embodiment of this application, the first magnetic pole center line, the second magnetic pole center line, the third magnetic pole center line, and the fourth magnetic pole center line are four adjacent magnetic pole center lines.

[0019] According to one embodiment of this application, the rotor lamination further includes a shaft hole located at the center of the lamination body;

[0020] One of the first positioning through holes on the center line of the first magnetic pole and the first positioning through hole on the center line of the second magnetic pole are both located on the first ring concentric with the shaft hole.

[0021] Another first positioning through hole on the center line of the first magnetic pole is located on the second ring concentric with the shaft hole, and the diameter of the first ring is different from that of the second ring.

[0022] According to one embodiment of this application, the second positioning through holes on the first deviation line and the fourth magnetic pole center line are both located on one of the first and second rings, and the second positioning through hole on the second deviation line is located on the other of the first and second rings.

[0023] According to one embodiment of this application, the rotor laminations further include:

[0024] At least three third positioning through holes with a diameter of d1, respectively corresponding to at least three first positioning through holes with a diameter of d1, wherein each third positioning through hole is symmetrical about the center of the lamination body with respect to the corresponding first positioning through hole;

[0025] At least three fourth positioning through holes with a diameter of d2, each corresponding to at least three second positioning through holes with a diameter of d2, wherein each fourth positioning through hole and the corresponding second positioning through hole are symmetrical about the center of the lamination body.

[0026] According to one embodiment of this application, the preset angle is in the range of 1.5°-5°.

[0027] According to one embodiment of this application, the rotor laminations further include:

[0028] At least one weight reduction hole, and each weight reduction hole is located on one of the magnetic pole center lines among a plurality of magnetic pole center lines;

[0029] The shape of the weight reduction hole is configured to be different from the shape of the first positioning through hole and / or the second positioning through hole; or

[0030] The size of the weight reduction hole is configured to be different from the size of the first positioning through hole and / or the second positioning through hole; or

[0031] The shape and size of the weight reduction hole are configured to be different from the shape and size of the first positioning through hole and / or the second positioning through hole.

[0032] According to one embodiment of this application, the rotor laminations further include:

[0033] Multiple weight-reducing slots are evenly arranged circumferentially around the center of the lamination body, with each slot located between the center lines of two adjacent magnetic poles.

[0034] Secondly, this application provides a segmented skewed pole motor rotor, including a shaft and a rotor core assembly sleeved on the shaft. The rotor core assembly includes multiple rotor cores with segmented skewed poles press-fitted, and each rotor core is formed by stacking multiple identical rotor laminations as described above.

[0035] According to one embodiment of this application, the number of rotor cores is 2m, where m is an integer greater than or equal to 4;

[0036] The positioning through holes of the rotor laminations stacked together in each rotor core are aligned to form the mounting holes of the rotor core;

[0037] The rotor cores in the rotor core assembly are sequentially divided into a first core group and a second core group with the same number of cores. Any two adjacent rotor cores are aligned and fixed through mounting holes of different diameters that are equidistant from the center of the rotor laminations. A first preset slant angle is formed between each two adjacent rotor cores in the first core group, and a second preset slant angle is formed between each two adjacent rotor cores in the second core group. The second preset slant angle has the same angle value as the first slant angle but with the opposite sign.

[0038] According to one embodiment of this application, the mounting hole includes a first mounting hole corresponding to a first positioning through hole of the rotor lamination and a second mounting hole corresponding to a second positioning through hole of the rotor lamination.

[0039] In a rotor core assembly, one of the first mounting holes of one of two adjacent rotor cores is aligned with one of the second mounting holes of the other rotor core and secured by fasteners, wherein the distances from the aligned first and second mounting holes to the center of the rotor laminations are equal.

[0040] According to one embodiment of this application, the fastener is a stepped shaft shape, having a first end with a diameter of d3 and a second end with a diameter of d4, wherein d4 < d3;

[0041] The first end of the fastener is configured to interfere with the first mounting hole;

[0042] The second end of the fastener is configured to interfere with the second mounting hole.

[0043] Furthermore, the length of the first end of the fastener is L1, and d3≤L1≤3d3;

[0044] The length of the second end of the fastener is L2, and d4≤L2≤3d4.

[0045] According to one embodiment of this application, the fastener is configured such that its first end is inserted into one of the first mounting holes of one of the two adjacent rotor cores, and its second end is inserted into one of the second mounting holes of the other of the two adjacent rotor cores, thereby fixing the two adjacent rotor cores.

[0046] In a first aspect, this application also provides an electric motor, including the motor rotor as described above.

[0047] The above-described one or more technical solutions in the embodiments of this application have at least one of the following technical effects:

[0048] First, by rationally designing the structure of the rotor laminations—specifically, by setting multiple magnet fixing slots, at least three first positioning through holes, and at least three second positioning through holes on the rotor laminations, and arranging each first and second positioning through hole in a corresponding position—different skew angles can be formed by positioning each rotor core using different positioning through holes when assembling the rotor core using these rotor laminations. This gives the rotor laminations strong versatility, allowing the manufacture of motor rotor cores using only the same rotor lamination mold, simplifying the mold structure and reducing mold development and manufacturing costs.

[0049] Secondly, by making the center lines of the first, second, third, and fourth magnetic poles adjacent, it facilitates the assembly of each rotor core in the subsequent rotor core assembly.

[0050] Third, by rationally arranging the specific positions of the first and second positioning through holes, each of the first and second positioning through holes is located on two different rings, thereby ensuring the dynamic balance of the rotor laminations.

[0051] Fourth, by aligning the first positioning through hole of one of the two adjacent rotor cores with the second positioning through hole of the other rotor core, and by setting a preset skew angle between the two adjacent rotor cores, the rotor cores can be fixed and the rotor segmented skew angle can be achieved without flipping the cores. Furthermore, since there is no need to flip the cores, the burr surfaces of each rotor core can be made to be in the same direction, thus avoiding gaps between multiple rotor cores during press-fitting.

[0052] Fifth, this hinge does not require a keyway, greatly reducing the cost of keyway installation.

[0053] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below.

[0054] The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0055] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0056] Figure 1 A schematic structural diagram of a rotor core in the related art is shown;

[0057] Figure 2 A schematic structural diagram of the rotating shaft in the related technology is shown;

[0058] Figure 3 A schematic front view of a rotor lamination according to an embodiment of the present invention is shown;

[0059] Figure 4 A schematic exploded view of a segmented skewed pole motor rotor according to Embodiment 1 of the present invention is shown;

[0060] Figure 5 A schematic structural diagram of the segmented skewed pole motor rotor after assembly according to Embodiment 1 of the present invention is shown;

[0061] Figure 6 A schematic structural diagram of a fastener according to Embodiment 1 of the present invention is shown.

[0062] Figure label:

[0063] 1-Keyway, 2-Shaft, 3-Rotor lamination, 31-Lamination body, 32-Shaft hole, 4-First magnetic pole centerline, 6-Second magnetic pole centerline, 5-Third magnetic pole centerline, 7-Fourth magnetic pole centerline, 8-First offset line, 9-Second offset line, 10-Magnet fixing groove, 101-First magnet groove, 102-Second magnet groove, 11-First process hole, 12-Second process hole, 13-Third process hole, 14-Fourth process hole Process hole, 15-Fifth process hole, 16-Sixth process hole, 17-Fastener, 171-First end, 172-Second end, 18-First rotor core, 19-Second rotor core, 20-Third rotor core, 21-Fourth rotor core, 22-Fifth rotor core, 23-Sixth rotor core, 24-Seventh rotor core, 25-Eighth rotor core, 26-First weight reduction hole, 27-Second weight reduction hole, 28-Weight reduction groove. Detailed Implementation

[0064] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0065] Figure 3 A schematic front view of a rotor lamination according to an embodiment of the present invention is shown. Figure 3 As shown, each rotor lamination 3 has a lamination body 31, an even number of magnet fixing slots 10, multiple magnets, at least three first positioning through holes with a diameter of d1 and at least three second positioning through holes with a diameter of d2, wherein d2 < d1.

[0066] Multiple magnet fixing slots 10 are evenly arranged on the outer periphery of the lamination body 31. The multiple magnets include an equal number of N-pole magnets and S-pole magnets, which are alternately installed in the magnet fixing slots 10 to form multiple magnetic pole center lines composed of an equal number of N-pole magnetic pole center lines and S-pole magnetic pole center lines.

[0067] Two first positioning through holes and another first positioning through hole are located on the first magnetic pole center line 4 and the second magnetic pole center line 6, respectively. The first magnetic pole center line 4 and the second magnetic pole center line 6 are two magnetic pole center lines with different polarities among multiple magnetic pole center lines. The two second positioning through holes are respectively set on the first deviation line 8 and the second deviation line 9. The first deviation line 8 and the second deviation line 9 are straight lines passing through the center of the lamination body 31, located on both sides of the third magnetic pole center line 5, and forming the same preset angle with the third magnetic pole center line 5. The third magnetic pole center line 5 is one of multiple magnetic pole center lines and is different from the first magnetic pole center line 4 and the second magnetic pole center line 6. Another second positioning through hole is located on the fourth magnetic pole center line 7. The fourth magnetic pole center line 7 is one of multiple magnetic pole center lines, different from the first magnetic pole center line 4 and the second magnetic pole center line 6, and has the opposite polarity to the third magnetic pole center line 5.

[0068] The first deviation line 8 and the second deviation line 9 deviate in opposite directions relative to the center line 5 of the third magnetic pole. Figure 3 The preset angle by which the first deviation line 8 and the second deviation line 9 deviate from the center line 5 of the third magnetic pole is marked as β. β can be any value in the range of 1.5°-5°, specifically, for example, 1.5°, 2°, 3°, 4° or 5°.

[0069] In one specific implementation, the number of magnet fixing slots 10 is 2n, where n ≥ 4 and n is a positive integer.

[0070] Figure 4A schematic exploded view of a segmented skewed pole motor rotor according to an embodiment of the present invention is shown. Figure 5 A schematic structural diagram of a segmented skewed-pole motor rotor according to an embodiment of the present invention is shown. Figure 4 and Figure 5 As shown, the motor rotor includes a shaft 2 and a rotor core assembly sleeved on the shaft 2. The rotor core assembly includes multiple rotor cores, each of which is formed by stacking multiple rotor laminations 3. The number of rotor cores in the rotor core assembly is 2m, where m ≥ 4, and m is a positive integer. It should be noted that there is no direct correspondence between m and n.

[0071] The positioning through holes of the rotor laminations 3 stacked together in each rotor core are aligned to form the mounting holes of the rotor core. The rotor cores in the rotor core group are sequentially divided into a first core group and a second core group with the same number of cores. Any two adjacent rotor cores are aligned and fixed through mounting holes of different diameters that are equidistant from the center of the rotor laminations. A first preset slant angle is formed between each two adjacent rotor cores in the first core group, and a second preset slant angle is formed between each two adjacent rotor cores in the second core group. The second preset slant angle has the same angle value as the first slant angle but opposite sign, thus forming a segmented slant stage structure.

[0072] The mounting hole includes a first mounting hole corresponding to a first positioning through hole of the rotor lamination and a second mounting hole corresponding to a second positioning through hole of the rotor lamination. In the rotor core assembly, one of the first mounting holes of one of two adjacent rotor cores is aligned with one of the second mounting holes of the other rotor core and fixed by fasteners 17, wherein the distance from the aligned first and second mounting holes to the center of the rotor lamination is equal.

[0073] The present invention also provides an electric motor, which includes the aforementioned motor rotor.

[0074] According to the embodiment of the present invention, by rationally designing the structure of the rotor lamination 3, namely, providing multiple magnet fixing slots 10, at least three first positioning through holes, and at least three second positioning through holes on the rotor lamination 3, and arranging each first positioning through hole and each second positioning through hole in a corresponding position, different skew pole angles can be formed by positioning each rotor core using different positioning through holes when using the rotor lamination 3 to assemble a rotor core assembly. This makes the rotor lamination 3 highly versatile, allowing the same rotor lamination 3 mold to be used to manufacture the rotor core of the motor rotor, simplifying the mold structure and reducing mold development and manufacturing costs.

[0075] The following detailed description uses specific examples:

[0076] Example 1:

[0077] like Figure 3 As shown, in the structure of the rotor lamination 3 in this embodiment, each magnet fixing slot 10 consists of a first magnet slot 101 and a second magnet slot 102, and the size of the first magnet slot 101 is larger than the diameter of the second magnet slot 102. A magnetic pole centerline is formed between the center of the magnet (specifically, a magnet) fixed in each magnet fixing slot 10 and the center of the lamination body 31 of the rotor lamination 3. The magnetic poles formed by two adjacent magnets have opposite polarities, that is, two adjacent magnetic poles must be an N pole and an S pole.

[0078] The first magnetic pole centerline 4, the second magnetic pole centerline 6, the third magnetic pole centerline 5, and the fourth magnetic pole centerline 7 are four adjacent magnetic pole centerlines. The second magnetic pole centerline 6 is located between the first magnetic pole centerline 4 and the third magnetic pole centerline 5, and the third magnetic pole centerline 5 is located between the second magnetic pole centerline 6 and the fourth magnetic pole centerline 7. The first magnetic pole centerline 4 and the third magnetic pole centerline 5 are S pole magnetic pole centerlines, and the second magnetic pole centerline 6 and the fourth magnetic pole centerline 7 are N pole magnetic pole centerlines, or the first magnetic pole centerline 4 and the third magnetic pole centerline 5 are N pole magnetic pole centerlines, and the second magnetic pole centerline 6 and the fourth magnetic pole centerline 7 are S pole magnetic pole centerlines.

[0079] Two first positioning through holes are disposed on the first magnetic pole centerline 4, and another first positioning through hole is disposed on the second magnetic pole centerline 6. Two second positioning through holes are disposed on the first offset line 8 and the second offset line 9, respectively. The first offset line 8 and the second offset line 9 are straight lines passing through the center of the lamination body 31, located on both sides of the third magnetic pole centerline 5, and forming an included angle β with the third magnetic pole centerline 5 at the same preset angle. Another second positioning through hole is disposed on the fourth magnetic pole centerline 7. The included angle β is in the range of 1.5°-5°, for example, 1.5°, 2°, 3°, 4° or 5°.

[0080] The rotor lamination 3 includes a shaft hole 32 located at the center of the lamination body 31. Two first positioning through holes located on the first magnetic pole centerline 4 are designated as the first process hole 11 and the second process hole 12, respectively. A first positioning through hole located on the second magnetic pole centerline 6 is designated as the third process hole 13. The center of the first process hole 11 is located at the intersection of the first magnetic pole centerline 4 and a first circular ring (not shown) concentric with the shaft hole 32. The diameter of the first circular ring is larger than the diameter of the shaft hole 32. The center of the second process hole 12 is located at the intersection of the first magnetic pole centerline 4 and a second circular ring (not shown) concentric with the shaft hole 32. The diameter of the second circular ring is smaller than the diameter of the first circular ring but larger than the diameter of the shaft hole 32. The center of the third process hole 13 is located at the intersection of the second magnetic pole centerline 6 and the first circular ring. A second positioning through hole located on the first offset line 8 is designated as the fourth process hole 14, a second positioning through hole located on the second offset line 9 is designated as the fifth process hole 15, and a second positioning through hole located on the fourth magnetic pole centerline 7 is designated as the sixth process hole 16. The center of the fourth process hole 14 is located at the intersection of the first offset line 8 and the first ring. The center of the fifth process hole 15 is located at the intersection of the second offset line 9 and the second ring. The center of the sixth process hole 16 is located at the intersection of the fourth magnetic pole center line 7 and the first ring.

[0081] like Figure 4 and Figure 5 As shown, this embodiment of the invention also provides a motor rotor, which includes a rotor core assembly. The rotor core assembly contains eight rotor cores, i.e., m = 4, and each rotor core has eight magnetic poles, i.e., n = 4. The rotor cores are formed by stacking multiple of the aforementioned rotor laminations 3. All rotor laminations 3 in this rotor core assembly are manufactured using the same tool.

[0082] like Figure 4 As shown, any two adjacent rotor cores in the rotor core assembly are fastened together by fasteners 17. Figure 6 A schematic structural diagram of a fastener according to Embodiment 1 of the present invention is shown. The fastener 17 has a first end 171 with a diameter of d3 and a second end 172 with a diameter of d4, wherein d4 < d3. The fastener 17 is configured such that its first end 171 is inserted into a first mounting hole in one of two adjacent rotor cores, and its second end 172 is inserted into a second mounting hole in the other of the two adjacent rotor cores, thereby fixing the two adjacent rotor cores.

[0083] The first end 171 of the fastener 17 has a length of L1, where d3 ≤ L1 ≤ 3d3. The second end 172 of the fastener 17 has a length of L2, where d4 ≤ L2 ≤ 3d4. Specifically, the fastener 17 can be, for example, a locating pin.

[0084] The following explanation uses the example of implementing an eight-segment rotor core with skewed poles. The eight segments are, in order: first rotor core 18, second rotor core 19, third rotor core 20, fourth rotor core 21, fifth rotor core 22, sixth rotor core 23, seventh rotor core 24, and eighth rotor core 25. The specific implementation method is as follows:

[0085] 1) Press the first end 171 of a fastener 17 into the fourth process hole 14 of the first rotor core 18, and press the first rotor core 18 into the shaft 2 by interference fit.

[0086] 2) Align the first process hole 11 of the second rotor core 19 with the second end 172 of the fastener 17 on the first rotor core 18, press the second end 172 of the fastener 17 into the first process hole 11 of the second rotor core 19 and press the second rotor core 19 into the rotating shaft 2, and press the second end 172 of another fastener 17 into the fourth process hole 14 of the second rotor core 19.

[0087] 3) Align the first process hole 11 of the third rotor core 20 with the first end 171 of the fastener 17 on the first rotor core 19, press the first end 171 of the fastener 17 into the first process hole 11 of the third rotor core 20 and press the third rotor core 20 into the rotating shaft 2, and press the second end 172 of the other fastener 17 into the fourth process hole 14 of the third rotor core 20.

[0088] 4) Align the first process hole 11 of the fourth rotor core 21 with the first end 171 of the fastener 17 on the third rotor core 20, press the first end 171 of the fastener 17 into the first process hole 11 of the fourth rotor core 21 and press the fourth rotor core 21 into the rotating shaft 2, and press the second end 172 of the other fastener 17 into the sixth process hole 16 of the fourth rotor core 21.

[0089] 5) Align the third process hole 13 of the fifth rotor core 22 with the first end 171 of the fastener 17 on the fourth rotor core 21, press the first end 171 of the fastener 17 into the third process hole 13 of the fifth rotor core 22 and press the fifth rotor core 22 into the rotating shaft 2, and press the second end 172 of another fastener 17 into the fifth process hole 15 of the fifth rotor core 22.

[0090] 6) Align the second process hole 12 of the sixth rotor core 23 with the first end 171 of the fastener 17 on the fifth rotor core 22, press the first end 171 of the fastener 17 into the second process hole 12 of the sixth rotor core 23 and press the sixth rotor core 23 into the rotating shaft 2, and press the second end 172 of another fastener 17 into the fifth process hole 15 of the sixth rotor core 23;

[0091] 7) Align the second process hole 12 of the seventh rotor core 24 with the first end 171 of the fastener 17 on the sixth rotor core 23, press the first end 171 of the fastener 17 into the second process hole 12 of the seventh rotor core 24 and press the seventh rotor core 24 into the rotating shaft 2, and press the second end 172 of another fastener 17 into the fifth process hole 15 of the seventh rotor core 24;

[0092] 8) Align the second process hole 12 of the eighth rotor core 25 with the first end 171 of the fastener 17 on the seventh rotor core 24, press the first end 171 of the fastener 17 into the second process hole 12 of the eighth rotor core 25, and press the seventh rotor core 24 into the shaft 2.

[0093] 9) Press all the rotor cores into the shaft 2 until the bottom, and make the cores fit together completely to achieve the skew poles of the eight rotor cores.

[0094] When the individual rotor cores in the rotor core assembly are assembled together, the burr surfaces of each rotor core are in the same direction.

[0095] The solution of this invention makes the first magnetic pole center line 4, the second magnetic pole center line 6, the third magnetic pole center line 5 and the fourth magnetic pole center line 7 four adjacent magnetic pole center lines, thereby facilitating the assembly of each rotor core in the subsequent rotor core assembly.

[0096] Furthermore, by rationally arranging the specific positions of the first and second positioning through holes, each of the first and second positioning through holes is located on two different rings. On the basis of realizing the segmented skewed poles of the motor rotor, the arrangement is more regular, which is conducive to dynamic balance and the structure is reasonable and aesthetically pleasing.

[0097] Furthermore, by aligning the first positioning through hole of one of the two adjacent rotor cores with the second positioning through hole of the other rotor core, and by setting a preset skew angle between the two adjacent rotor cores, the rotor cores can be fixed and the rotors can be segmented with skew angles without flipping the cores. Since there is no need to flip the cores, the burr surfaces of each rotor core can be made to be in the same direction, thus avoiding gaps between multiple rotor cores during press-fitting.

[0098] Furthermore, the hinge 2 does not require a keyway, greatly reducing the cost of keyway installation.

[0099] Example 2:

[0100] The difference between Embodiment 2 and Embodiment 1 is that each rotor core has 8 magnetic poles, and the number of rotor cores in the rotor core group can be 10, 12, 14, or 16, or an even number greater than 16. Alternatively, each rotor core has 2n magnetic poles, where n ≥ 5, and the number of rotor cores in the rotor core group can be 10, 12, 14, or 16, or an even number greater than 16.

[0101] When the rotor cores in the rotor core assembly are assembled together, the burr surfaces of each rotor core are in the same direction, and one of the first positioning through holes in two adjacent rotor cores is aligned with one of the second positioning through holes in another rotor core. It is ensured that the polarity of the magnetic pole center line or the magnetic pole center line that the aligned first positioning through hole and the second positioning through hole are located on is the same (relative to the second positioning through hole located on the first deviation line and the second deviation line).

[0102] Example 3:

[0103] The difference between Embodiment 3 and Embodiment 1 is that the rotor lamination 3 further includes at least one weight-reducing hole, each weight-reducing hole being located on one of the multiple magnetic pole center lines. The shape of this weight-reducing hole is configured to be different from the shape of the first positioning through-hole located on the second magnetic pole center line 6 and / or the shape of the second positioning through-hole located on the fourth magnetic pole center line 7; or the size of the weight-reducing hole is configured to be different from the size of the first positioning through-hole and / or the second positioning through-hole; or the shape and size of the weight-reducing hole are both different from the shape and size of the first positioning through-hole and / or the second positioning through-hole. Figure 3 As shown, there are two weight-reducing holes, namely a first weight-reducing hole 26 and a second weight-reducing hole 27. The first weight-reducing hole 26 is located on the center line 6 of the second magnetic pole, and its center is located at the intersection of the center line 6 of the second magnetic pole and the second ring. The second weight-reducing hole 27 is located on the center line 7 of the fourth magnetic pole, and its center is located at the intersection of the center line 7 of the fourth magnetic pole and the second ring.

[0104] The first weight-reducing hole 26 is shaped the same as the third process hole 13, but smaller in size. The second weight-reducing hole 27 is shaped the same as the sixth process hole 16, but smaller in size. Alternatively, the first weight-reducing hole 26 may be shaped differently from the third process hole 13, and the second weight-reducing hole 27 may be shaped differently from the sixth process hole 16. Or, both the shape and size of the first weight-reducing hole 26 and the second weight-reducing hole 27 may be different from both the shape and size of the third process hole 13. This allows for clear differentiation between the process holes and the weight-reducing holes, thus preventing installation errors when installing the fastener 17.

[0105] By setting weight-reduction holes, the weight of the rotor core can be reduced. Furthermore, by positioning the first weight-reduction hole 26 and the second weight-reduction hole 27 as described above, the symmetry and aesthetics of the rotor core can be maintained while reducing weight.

[0106] Example 4:

[0107] The technical solution of this embodiment 4 differs from that of embodiment 1 or embodiment 3 in that the rotor lamination 3 further includes multiple weight-reducing grooves 28. The multiple weight-reducing grooves 28 are evenly arranged circumferentially around the center of the lamination body 31 (specifically, the shaft hole 32), and each weight-reducing groove 28 is located between the center lines of two adjacent magnetic poles. The shape of the weight-reducing groove 28 is different from the shape of each process hole.

[0108] By setting the weight-reducing slots 28, the weight of the rotor core can be reduced. Furthermore, arranging multiple weight-reducing slots 28 circumferentially around the center of the lamination ensures the symmetry and aesthetics of the rotor core while reducing weight.

[0109] Example 5:

[0110] The technical solution of this embodiment 5 differs from that of embodiments 1, 3, or 4 in that the rotor lamination 3 further includes at least three third positioning through holes of diameter d1 corresponding to at least three first positioning through holes of diameter d1, and at least three fourth positioning through holes of diameter d2 corresponding to at least three second positioning through holes of diameter d2. Each third positioning through hole and its corresponding first positioning through hole are symmetrical about the center of the lamination body 31. Each fourth positioning through hole and its corresponding second positioning through hole are symmetrical about the center of the lamination body 31. This symmetrical design improves the dynamic balance performance of the rotor core.

[0111] Example 6:

[0112] The difference between Embodiment Six and Embodiment One is that the center of the third process hole 13 is located at the intersection of the second magnetic pole center line 6 and the second ring. The center of the fourth process hole 14 is located at the intersection of the first offset line 8 and the second ring. The center of the fifth process hole 15 is located at the intersection of the second offset line 9 and the first ring. The center of the sixth process hole 16 is located at the intersection of the fourth magnetic pole center line 7 and the second ring.

[0113] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0114] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A rotor lamination, characterized in that, include: Film processing body; An even number of magnet fixing slots are evenly arranged on the outer periphery of the lamination body; Multiple magnets, including an equal number of N-pole magnets and S-pole magnets, are alternately installed in the magnet fixing groove to form multiple magnetic pole center lines composed of an equal number of N-pole magnetic pole center lines and S-pole magnetic pole center lines that alternate with each other. At least three first positioning through holes with a diameter of d1, wherein two of the first positioning through holes are located on the first magnetic pole center line and the other first positioning through hole is located on the second magnetic pole center line, and the first magnetic pole center line and the second magnetic pole center line are two magnetic pole center lines with different polarities among the plurality of magnetic pole center lines; At least three second positioning through holes with a diameter of d2, where d2 < d1, wherein two of the second positioning through holes are respectively disposed on the first deviation line and the second deviation line, the first deviation line and the second deviation line being straight lines passing through the center of the lamination body, respectively located on both sides of the third magnetic pole center line, and forming an angle with the third magnetic pole center line of the same preset angle, the third magnetic pole center line being one of the plurality of magnetic pole center lines and different from the first magnetic pole center line and the second magnetic pole center line; the other second positioning through hole is located on the fourth magnetic pole center line, the fourth magnetic pole center line being one of the plurality of magnetic pole center lines, different from the first magnetic pole center line and the second magnetic pole center line, and having the opposite polarity to the third magnetic pole center line.

2. The rotor lamination according to claim 1, characterized in that, The number of magnet fixing slots is 2n, where n is an integer greater than or equal to 4.

3. The rotor lamination according to claim 2, characterized in that, The first magnetic pole center line, the second magnetic pole center line, the third magnetic pole center line, and the fourth magnetic pole center line are four adjacent magnetic pole center lines.

4. The rotor lamination according to claim 2, characterized in that, It also includes a pivot hole located at the center of the lamination body; One of the first positioning through holes on the center line of the first magnetic pole and the first positioning through hole on the center line of the second magnetic pole are both located on a first ring concentric with the shaft hole; Another first positioning through hole on the center line of the first magnetic pole is located on a second ring concentric with the pivot hole, and the diameter of the first ring is different from the diameter of the second ring.

5. The rotor lamination according to claim 4, characterized in that, The second positioning through hole on the first deviation line and the center line of the fourth magnetic pole are both located on one of the first ring and the second ring, and the second positioning through hole on the second deviation line is located on the other of the first ring and the second ring.

6. The rotor lamination according to any one of claims 1-5, characterized in that, Also includes: At least three third positioning through holes with a diameter of d1 are respectively corresponding to at least three first positioning through holes with a diameter of d1, and each of the third positioning through holes and the corresponding first positioning through hole are symmetrical about the center of the lamination body; At least three fourth positioning through holes with a diameter of d2 are respectively corresponding to at least three second positioning through holes with a diameter of d2, and each of the fourth positioning through holes and the corresponding second positioning through hole are symmetrical about the center of the lamination body.

7. The rotor lamination according to any one of claims 1-5, characterized in that, The preset angle is in the range of 1.5°-5°.

8. The rotor lamination according to any one of claims 1-5, characterized in that, Also includes: At least one weight-reducing hole, and each of the weight-reducing holes is located on one of the multiple magnetic pole center lines; Wherein, the shape of the weight-reducing hole is configured to be different from the shape of the first positioning through hole and / or the second positioning through hole; or The size of the weight reduction hole is configured to be different from the size of the first positioning through hole and / or the second positioning through hole; or The shape and size of the weight reduction hole are configured to be different from the shape and size of the first positioning through hole and / or the second positioning through hole.

9. The rotor lamination according to any one of claims 1-5, characterized in that, Also includes: Multiple weight-reducing grooves are evenly arranged circumferentially around the center of the lamination body, and each weight-reducing groove is located between the center lines of two adjacent magnetic poles.

10. A segmented skew-pole motor rotor, characterized in that, It includes a rotating shaft and a rotor core assembly sleeved on the rotating shaft. The rotor core assembly includes multiple rotor cores with segmented oblique pole press-fitting. Each rotor core is formed by stacking multiple identical rotor laminations as described in any one of claims 1-9.

11. The motor rotor according to claim 10, characterized in that, The number of rotor cores is 2m, where m is an integer greater than or equal to 4; The positioning through holes of the rotor laminations stacked together in each rotor core are aligned to form the mounting holes of the rotor core; The rotor cores in the rotor core assembly are sequentially divided into a first core group and a second core group with the same number of cores. Any two adjacent rotor cores are aligned and fixed through mounting holes of different diameters that are equidistant from the center of the rotor laminations. A first preset slant angle is formed between each two adjacent rotor cores in the first core group, and a second preset slant angle is formed between each two adjacent rotor cores in the second core group. The second preset slant angle has the same angle value as the first preset slant angle but with the opposite sign.

12. The motor rotor according to claim 11, characterized in that, The mounting holes include a first mounting hole corresponding to the first positioning through hole of the rotor lamination and a second mounting hole corresponding to the second positioning through hole of the rotor lamination. In the rotor core assembly, one of the first mounting holes of one of two adjacent rotor cores is aligned with one of the second mounting holes of the other rotor core and fixed by fasteners, wherein the distances from the aligned first mounting hole and the second mounting hole to the center of the rotor lamination are equal.

13. The motor rotor according to claim 12, characterized in that, The fastener is a stepped shaft with a first end of diameter d3 and a second end of diameter d4, wherein d4 < d3; The first end of the fastener is configured to interfere with the first mounting hole; The second end of the fastener is configured to interfere with the second mounting hole.

14. The motor rotor according to claim 13, characterized in that, The length of the first end of the fastener is L1, and d3≤L1≤3d3; The length of the second end of the fastener is L2, and d4≤L2≤3d4.

15. The motor rotor according to claim 13 or 14, characterized in that, The fastener is configured such that its first end is inserted into one of the first mounting holes of one of the two adjacent rotor cores, and its second end is inserted into one of the second mounting holes of the other of the two adjacent rotor cores, thereby fixing the two adjacent rotor cores.

16. An electric motor, characterized in that, Includes the motor rotor as described in any one of claims 10-15.

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