Oblique pole rotor, motor and vehicle

Abstract

The invention provides a skewed pole rotor, a motor and a vehicle. The skewed pole rotor comprises a rotating shaft and a rotor core sleeved on the rotating shaft. The rotor iron core comprises 2N iron cores, and the first iron core to the 2Nth iron core are sequentially and adjacently arranged in the axial direction of the rotating shaft. The rotor iron core comprises a first iron core group and a second iron core group. The first iron core group comprises the first iron core to the Nth iron core. And the second iron core group comprises the (N + 1) th iron core to the 2Nth iron core. The iron cores in each iron core set are staggered by a certain angle in the circumferential direction to form a skewed pole structure, and the skewed pole structure in each iron core set is of an asymmetric structure. The skewed pole angles of the iron cores at the corresponding positions in the first iron core group and the second iron core group are the same; wherein N is greater than or equal to 3. According to the skewed pole rotor, the motor and the vehicle, second-order torsional vibration can be reduced, and the cost is low.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a skew-pole rotor, a motor, and a vehicle. Background Art

[0002] To improve vehicle noise, vibration, and harshness (VNH) performance, motor NVH research has become a hot topic and a key focus in the automotive industry. In particular, the second-order torsional mode of the motor rotor, often excited by motor torque fluctuations, causes severe vibration, leading to noise and component fatigue, seriously impacting the reliability and ride comfort of the electric drive system.

[0003] Existing technologies primarily reduce torque fluctuations through electromagnetic optimization or enhance rotor modal properties by applying glue between segments and increasing stacking pressure. However, electromagnetic optimization has limited effectiveness at high speeds and is costly. Improving rotor modal properties requires additional equipment investment, resulting in low returns and minimal results.

[0004] Therefore, it is necessary to provide an improved skew-pole rotor, motor and vehicle to solve the above problems. Summary of the Invention

[0005] The present application provides a low-cost skewed-pole rotor, motor, and vehicle that can reduce second-order torsional vibration.

[0006] The present application discloses a skewed pole rotor, comprising a rotating shaft and a rotor core sleeved on the rotating shaft, wherein the rotor core comprises 2N cores, with the first to 2N cores sequentially arranged adjacent to each other along the axial direction of the rotating shaft; the rotor core comprises a first core group and a second core group, the first core group comprises the first to N cores, and the second core group comprises the N+1 cores to the 2N cores, the cores in each core group are staggered at a certain angle along the circumferential direction to form a skewed pole structure, and the skewed pole structure in each core group is an asymmetric structure; the skew pole angles of the cores at corresponding positions in the first core group and the second core group are the same; wherein N is greater than or equal to 3.

[0007] Furthermore, the oblique pole angles of the N cores in the first core group are all different; and the oblique pole angles of the N cores in the second core group are all different.

[0008] Furthermore, in the first core group, the first core to the Nth core are staggered in sequence by a certain angle along the same circumferential direction; in the second core group, the N+1th core to the 2Nth core are staggered in sequence by a certain angle along the same circumferential direction.

[0009] Furthermore, the difference between the oblique pole angles of any two adjacent cores in the first core group is equal; and the difference between the oblique pole angles of any two adjacent cores in the second core group is equal.

[0010] Furthermore, the difference in the oblique pole angles between any two adjacent cores in the first core group is 2.5°; the difference in the oblique pole angles between any two adjacent cores in the second core group is 2.5°.

[0011] Furthermore, when N=3, the oblique pole angle between the second core and the fifth core is 0°.

[0012] Furthermore, the outer peripheral surface of each of the iron cores is provided with a plurality of grooves extending along the axial direction of the rotating shaft.

[0013] Furthermore, each of the iron cores includes a plurality of iron core punching sheets, and the plurality of iron core punching sheets are stacked along the axial direction of the rotating shaft.

[0014] The present application also discloses a motor, comprising a stator and the skewed-pole rotor as described above, wherein the stator and the skewed-pole rotor are coaxially arranged.

[0015] The present application also discloses a vehicle comprising the motor as described above.

[0016] The rotor core of the skewed pole rotor, motor, and vehicle of the present application includes a first core group and a second core group. The cores in each core group are staggered at a certain angle along the circumferential direction to form a skewed pole structure, and the skewed pole structure in each core group is an asymmetric structure. The skewed pole angles of the cores at corresponding positions in the first core group and the second core group are the same. By distributing the skewed pole angles of the cores in each core group according to a specific rule and utilizing the characteristic of the same skewed pole angles at corresponding positions, the composite vibration can be minimized during the second-order torsion of the skewed pole rotor, effectively improving the NVH performance of the skewed pole rotor and reducing the second-order torsional vibration. In addition, by adjusting the skewed pole angles of the cores, there is no need to add additional equipment, which can reduce development costs and time costs.

[0017] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the specification and, together with the description, serve to explain the principles of the specification.

[0019] Figure 1 It is a three-dimensional diagram of a skewed pole rotor according to an embodiment of the present application.

[0020] Figure 2 yes Figure 1 Side view of the skew-pole rotor.

[0021] Figure 3 yes Figure 1 Schematic diagram of the skewed pole structure of the medium skewed pole rotor.

[0022] Figure 4 yes Figure 1 Comparison chart of vibration analysis of medium skew pole rotor and skew pole rotor in related technologies.

[0023] Figure 5 It is a schematic diagram of the skewed pole structure of the skewed pole rotor according to another embodiment of the present application.

[0024] Explanation of the accompanying drawings: 10, shaft; 20, rotor core; 201, first core group; 202, second core group; 21, core; 211, 211', first core; 212, 212', second core; 213, 213', third core; 214, 214', fourth core; 215, 215', fifth core; 216, 216', sixth core; 217', seventh core; 218', eighth core; 22, groove. DETAILED DESCRIPTION

[0025] Here, the technical solutions in the embodiments (or "implementations") of the present application will be clearly and completely described in conjunction with the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0026] If there are terms related to directional indications or positional relationships in the embodiments of this application (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationship, movement, etc. between the components in a specific posture (as shown in the accompanying drawings); if the specific posture changes, the directional indication or positional relationship will also change accordingly. In addition, the terms "first" and "second" in the embodiments of this application are only used for the purpose of convenience of description and should not be understood as indicating or implying relative importance.

[0027] Next, the embodiments of this specification are described in detail.

[0028] like Figure 1 and Figure 2 As shown, the present application provides an oil-cooled motor, comprising a rotating shaft 10 and a rotor core 20. The rotor core 20 is sleeved on the rotating shaft 10 and can rotate along the axis of the rotating shaft 10.

[0029] The rotor core 20 is arranged in sections, and includes 2N cores 21 in total, namely a first core, a second core, ..., a 2Nth core. The first core to the 2Nth core are sequentially arranged adjacent to each other along the axial direction of the rotating shaft 10 .

[0030] In the present application, the rotor core 20 includes a first core group 201 and a second core group 202. Each of the first core group 201 and the second core group 202 includes N cores 21. The first core group 201 includes the first through Nth cores, and the second core group 202 includes the (N+1)th through 2Nth cores. In other words, with the boundary between the Nth and 2Nth cores as the boundary, the N cores 21 closer to the Nth core constitute the first core group 201, and the N cores 21 closer to the 2Nth core constitute the second core group 202.

[0031] The cores 21 in each core group are staggered at a certain angle along the circumferential direction to form a skewed pole structure, and the skewed pole structures in each core group are asymmetric. That is, in the first core group 201, each core 21 is deflected at a certain angle in the circumferential direction relative to its adjacent core 21 to form a skewed pole structure, and the skewed pole structure formed by the N cores 21 in the first core group 201 is an asymmetric structure. In the second core group 202, each core 21 is also deflected at a certain angle in the circumferential direction relative to its adjacent core 21 to form a skewed pole structure, and the skewed pole structure formed by the N cores 21 in the second core group 202 is an asymmetric structure.

[0032] The cores 21 at corresponding positions in the first core group 201 and the second core group 202 have the same skew angle. That is, the first core has the same skew angle as the (N+1)th core, the second core has the same skew angle as the (N+2)th core, and so on. The Nth core has the same skew angle as the 2Nth core. The first core group 201 and the second core group 202 have the same skew structure. During the actual design and development process, the specific skew angle of each core 21 can be flexibly designed as needed.

[0033] In this way, by distributing the core skew angles within each core group according to a specific pattern and utilizing the identical skew angles at corresponding positions in the first core group 201 and the second core group 202, the combined vibration can be minimized during the second-order torsional rotation of the skewed rotor, effectively improving the NVH performance of the skewed rotor and reducing second-order torsional vibration. Furthermore, by adjusting the core skew angles, without changing the rotor topology or adding additional equipment, the second-order torsional modal vibration can be fundamentally reduced through structural optimization, improving the stability and reliability of the skewed rotor's operation and reducing development costs and time.

[0034] In some embodiments, the N cores 21 in the first core group 201 have different skew angles. Correspondingly, the N cores 21 in the second core group 202 also have different skew angles. By designing the cores 21 in each group with differentiated angles, the distribution characteristics of the rotor's second-order torsional vibration mode (such as the difference in vibration phase and amplitude between different segments) can be precisely matched, enabling more flexible phase cancellation of each segment's excitation, further optimizing NVH control, and significantly reducing vibration peaks.

[0035] In some cases, within each core group, there may be two or more cores 21 with the same slant angle, provided that the slant pole structure is an asymmetric structure.

[0036] In some embodiments, within the first core group 201, the first through Nth cores are sequentially staggered at a certain angle along the same circumferential direction. Correspondingly, within the second core group 202, the N+1th through 2Nth cores are sequentially staggered at a certain angle along the same circumferential direction. That is, within each core group, the skewed pole structure of the cores 21 approximates a straight line with an inclination. The overall skewed pole structure of the skewed rotor approximates two straight lines with the same inclination direction.

[0037] In some embodiments, the difference in the slant angles of any two adjacent cores 21 in the first core group 201 is equal. That is, within the first core group 201, the deflection angle of each core 21 relative to its adjacent core 21 is equal. For example, the first core group 201 includes a first core, a second core, and a third core. The slant angle of the first core is 0°, the slant angle of the second core is α, and the slant angle of the third core is 2α. The deflection angle of the second core relative to the first core and the deflection angle of the third core relative to the second core are both α. Correspondingly, the difference in the slant angles of any two adjacent cores 21 in the second core group 202 is also equal.

[0038] In this way, the phase change of the skew-pole rotor vibration excitation becomes systematic, which facilitates targeted offset design based on the vibration mode distribution (such as the phase-opposite segment of the second-order torsional vibration mode), enhances the consistency and predictability of vibration suppression, and helps improve development efficiency.

[0039] In some cases, provided that the skew-pole structure is asymmetric, the different cores 21 within each core group may be staggered along different circumferential directions, and the deflection angles of the different cores 21 within each core group may not be exactly the same as those of the adjacent cores 21. For example, the first core group 201 includes a first core, a second core, and a third core. The deflection angle of the second core relative to the first core is α, and the deflection angle of the third core relative to the second core is β.

[0040] Furthermore, in the present application, each iron core 21 includes a plurality of iron core punchings, which are stacked along the axial direction of the rotating shaft 10. The outer peripheral surface of each iron core 21 is provided with a plurality of grooves 22 extending along the axial direction of the rotating shaft 10, so that the torque pulsation and radial electromagnetic force generated by each section of the iron core 21 are suppressed to a low level, thereby reducing the torque pulsation and radial electromagnetic force of the motor as a whole, effectively suppressing the vibration noise of the motor, and thus achieving a better comprehensive vibration and noise reduction effect.

[0041] In the present application, N is greater than or equal to 3. The number of the iron cores 21 in the rotor iron core 20 can be set to 6, 8 or more.

[0042] Please refer to Figures 1 to 2 In this embodiment, N = 3. The rotor core 20 comprises six cores 21, namely, a first core 211, a second core 212, a third core 213, a fourth core 214, a fifth core 215, and a sixth core 216, stacked in axial order. The first core group 201 includes the first core 211, the second core 212, and the third core 213. The second core group 202 includes the fourth core 214, the fifth core 215, and the sixth core 216.

[0043] Please also refer to Figure 3 The first core 211 and the fourth core 214 have the same oblique polarity angle, the second core 212 and the fifth core 215 have the same oblique polarity angle, and the third core 213 and the sixth core 216 have the same oblique polarity angle. Specifically, the oblique polarity angles of the first core 211 and the fourth core 214 are both 2.5°, the oblique polarity angles of the second core 212 and the fifth core 215 are both 0°, and the oblique polarity angles of the third core 213 and the sixth core 216 are both -2.5°. The difference in oblique polarity angles between any two adjacent cores 21 in the first core group 201 is 2.5°, and the difference in oblique polarity angles between any two adjacent cores 21 in the second core group 202 is 2.5°.

[0044] The second-order torsional mode vibration modes of the skew-pole rotor of this embodiment are concentrated in the first core 211, third core 213, fourth core 214, and sixth core 216. The second core 212 and fifth core 215 are modal nodes, with relatively small vibration mode amplitudes. As shown in the table below, at the second-order torsional vibration mode, the vibration modes of the first core 211 and fourth core 214 are opposite in phase, but similar in value, with different vibration mode amplitudes. The vibration modes of the third core 213 and sixth core 216 are opposite in phase, but similar in value, with different vibration mode amplitudes.

[0045] iron core First core The third core Fourth core Sixth core Amplitude (mm) 16.7 24.88 24.77 16.64 Phase (°) 96.866 -80.291 -90.963 93.753

[0046] The first core 211 and the fourth core 214 have the same skew angle, the same excitation amplitude and phase. Under this excitation, the composite vibration of the first core 211 and the fourth core 214 is minimized. The third core 213 and the sixth core 216 have the same skew angle, the same excitation amplitude and phase. Under this excitation, the composite vibration of the third core 213 and the sixth core 216 is minimized. The second core 212 and the fifth core 215 are modal nodes, and their vibrations approach 0. Therefore, in the skewed pole rotor of this embodiment, the skewed pole arrangement of the six core segments 21 minimizes the composite vibration of each segment at the second-order torsional mode, effectively improving the NVH performance.

[0047] like Figure 4 As shown, under the same simulation conditions, compared with the symmetrical V-shaped skew pole and asymmetrical V-shaped skew pole arrangements in the related art, the skew pole structure designed in this embodiment has a significantly lower vibration peak point at the second-order torsional state, which indicates that the skew pole structure of the present application can fundamentally reduce the second-order torsional modal vibration and improve the stability and reliability of the skew pole rotor operation.

[0048] like Figure 5 As shown, in this embodiment, N = 4. The rotor core 20 includes eight cores 21, namely, a first core 211', a second core 212', a third core 213', a fourth core 214', a fifth core 215', a sixth core 216', a seventh core 217', and an eighth core 218', stacked in axial order. The first core group 201 includes the first core 211', the second core 212', the third core 213', and the fourth core 214'. The second core group 202 includes the fifth core 215', the sixth core 216', the seventh core 217', and the eighth core 218'.

[0049] The first core 211' and the fifth core 215' have the same oblique angle, the second core 212' and the sixth core 216' have the same oblique angle, the third core 213' and the seventh core 217' have the same oblique angle, and the fourth core 214' and the eighth core 218' have the same oblique angle.

[0050] The second-order torsional mode vibration modes of the skew-pole rotor of this embodiment are concentrated in the first core 211', the fourth core 214', the fifth core 215', and the eighth core 218'. The second core 212', the third core 213', the sixth core 216', and the seventh core 217' are modal nodes with relatively small vibration mode amplitudes.

[0051] As shown in the table below, at the second-order torsion, the vibration modes of the first core 211' and the fifth core 215' are opposite in phase, but close in value, and have different vibration amplitudes. The vibration modes of the fourth core 214' and the eighth core 218' are opposite in phase, but close in value, and have different vibration amplitudes.

[0052] iron core First core Fourth core Fifth core Eighth core Amplitude (mm) 16.04 21.07 20.97 15.88 Phase (°) -97.74 79.54 84.146 -99.18

[0053] The first core 211' and the fifth core 215' have the same skew angle, the same excitation amplitude and phase. Under this excitation, the composite vibration of the first core 211' and the fifth core 215' is minimized. The fourth core 214' and the eighth core 218' have the same skew angle, the same excitation amplitude and phase. Under this excitation, the composite vibration of the fourth core 214' and the eighth core 218' is minimized. The vibrations of the second core 212', the third core 213', the sixth core 216' and the seventh core 217' approach 0. Therefore, in the skew pole rotor of this embodiment, the skew pole arrangement of the eight core segments 21 minimizes the composite vibration of each segment at the second-order torsional mode, effectively improving the NVH performance.

[0054] The present application also provides a motor, comprising a stator and the skewed-pole rotor as described above, wherein the stator and the skewed-pole rotor are coaxially arranged.

[0055] The present application also provides a vehicle comprising the motor as described above.

[0056] The rotor core 20 of the skewed pole rotor, motor, and vehicle of the present application includes a first core group 201 and a second core group 202. The cores 21 in each core group are staggered at a certain angle along the circumferential direction to form a skewed pole structure, and the skewed pole structure in each core group is an asymmetric structure. The skewed pole angles of the cores 21 at corresponding positions in the first core group 201 and the second core group 202 are the same. By distributing the skewed pole angles of the cores 21 in each core group according to a specific rule and utilizing the characteristic of the same skewed pole angles at corresponding positions, the skewed poles of the rotor assembly are designed for phase cancellation, and the synthetic vibration can be minimized during the second-order torsion of the skewed pole rotor, effectively improving the NVH performance of the skewed pole rotor and reducing the second-order torsional vibration. In addition, by adjusting the skewed pole angles of the cores 21, there is no need to add additional equipment, which can reduce development costs and time costs.

[0057] It should be noted that the technical solutions or technical features described in the above embodiments can be combined or supplemented with each other without conflict. The scope of protection of this application is not limited to the precise structures described in the above embodiments and shown in the accompanying drawings; all modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this application shall be included in the scope of protection of this application.

Claims

1. A skew pole rotor, characterized in that: It includes a rotating shaft and a rotor core sleeved on the rotating shaft, the rotor core includes 2N cores, and the first to 2N cores are arranged adjacent to each other in the axial direction of the rotating shaft; the rotor core includes a first core group and a second core group, the first core group includes the first to N cores, and the second core group includes the N+1 core to the 2N cores, the cores in each core group are staggered at a certain angle along the circumferential direction to form a skewed pole structure, and the skewed pole structure in each core group is an asymmetric structure; the skewed pole angles of the cores at corresponding positions in the first core group and the second core group are the same; wherein N is greater than or equal to 3.

2. The skewed pole rotor according to claim 1, characterized in that: The oblique pole angles of the N cores in the first core group are all different; the oblique pole angles of the N cores in the second core group are all different.

3. The skewed pole rotor according to claim 2, characterized in that: In the first core group, the first core to the Nth core are staggered at a certain angle in the same circumferential direction; in the second core group, the N+1th core to the 2Nth core are staggered at a certain angle in the same circumferential direction.

4. The skewed pole rotor according to claim 1, characterized in that: The difference between the oblique pole angles of any two adjacent cores in the first core group is equal; the difference between the oblique pole angles of any two adjacent cores in the second core group is equal.

5. The skewed pole rotor according to claim 4, characterized in that: The difference in the oblique pole angles between any two adjacent cores in the first core group is 2.5°; the difference in the oblique pole angles between any two adjacent cores in the second core group is 2.5°.

6. The skewed pole rotor according to claim 1, characterized in that: When N=3, the skew angle between the second core and the fifth core is 0°.

7. The skewed pole rotor according to claim 1, characterized in that: The outer peripheral surface of each iron core is provided with a plurality of grooves extending along the axial direction of the rotating shaft.

8. The skewed pole rotor according to claim 1, characterized in that: Each of the iron cores includes a plurality of iron core punching sheets, and the plurality of iron core punching sheets are stacked along the axial direction of the rotating shaft.

9. A motor, characterized in that: The invention comprises a stator and a skewed pole rotor according to any one of claims 1 to 8, wherein the stator and the skewed pole rotor are coaxially arranged.

10. A vehicle, characterized in that: Comprising the motor as claimed in claim 9.

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