Motor rotor and motor

Abstract

The embodiment of the present application discloses a motor rotor and a motor, which relates to the field of motor technology and solves the problem of large motor vibration noise in the related technology. The motor rotor includes a shaft body and a plurality of rotor segments, the rotor segments are arranged in sequence along the axial direction of the shaft body, and two adjacent rotor segments are in the same direction, the reference magnetic pole center line of one rotor segment rotates counterclockwise by an acute angle, and the reference magnetic pole center line of the other rotor segment rotates clockwise by an acute angle. The motor rotor of the present application is used to rotate in the motor to output power.

Description

Technical Field

[0001] The embodiments of the present application relate to but are not limited to the field of motors, and in particular to a motor rotor and a motor. Background Art

[0002] Permanent magnet synchronous motors have the characteristics of high efficiency, high power density, and high torque density, and are therefore increasingly widely used in the field of new energy vehicles. Due to the non-sinusoidal magnetic field of permanent magnet synchronous motors and the influence of the stator slot effect, large tooth harmonics, slot torque, torque fluctuations, and noise will be generated when the rotor rotates in the circumferential direction. Among them, torque fluctuation is an important indicator affecting the performance of permanent magnet motors. Torque fluctuations can cause motor jitter, generate electromagnetic vibration and noise, and affect control accuracy. When the fluctuation is severe, it will lead to performance degradation or even control failure.

[0003] At present, permanent magnet motors use the method of skewing poles to reduce noise and vibration. There are two main directions, one is stator skew slots, and the other is rotor skew poles. Stator skew slots put forward very high requirements for the processing and production of stator cores, and it is also a great challenge for the process of wire embedding. It has not yet reached the stage of vigorous promotion. At this stage, the more popular and more feasible method is rotor skewing. The fundamental method of rotor skewing is to make the upper and lower sections of the magnetic steel or permanent magnet have a small angle in the circumferential direction, so as to achieve the purpose of smoothing the sharp change of the magnetic field.

[0004] Among them, the motor skewed pole rotor type in related technologies is mostly linear skewed pole or symmetrical V-shaped skewed pole. This design does not optimize the motor noise. Therefore, how to better optimize the motor vibration and noise performance has become an urgent problem to be solved. Summary of the invention

[0005] The motor rotor and the motor provided in the embodiments of the present application have the advantages of low vibration and noise when the motor is running and excellent motor performance.

[0006] In a first aspect, an embodiment of the present application provides a motor rotor, comprising a shaft and a plurality of rotor segments, wherein the rotor segments are arranged in sequence along the axial direction of the shaft, and two adjacent rotor segments are arranged in the same direction, wherein the reference magnetic pole center line of one rotor segment is rotated counterclockwise by an acute angle, and the reference magnetic pole center line of the other rotor segment is rotated clockwise by an acute angle.

[0007] In the motor rotor provided in the embodiment of the present application, the shaft body provides an installation basis for the rotor segment, and multiple rotor segments can be arranged along the axial direction of the shaft body. Each rotor segment is provided with a magnetic member to form a magnetic pole pair. After the motor is energized, the magnetic pole pair on the rotor segment interacts with the electromagnet on the motor stator, thereby causing the motor rotor to rotate. Since two adjacent rotor segments of the present application are in the same direction, the reference magnetic pole center line of one rotor segment rotates counterclockwise by an acute angle, and the reference magnetic pole center line of the other rotor segment rotates clockwise by an acute angle, that is, on the basis of the existence of an acute angle between the reference magnetic pole center lines of the two adjacent rotor segments, multiple magnetic pole center lines are alternately arranged left and right along the extension direction of the shaft body, and a staggered segmented rotor skewed pole form is adopted, so that the torque fluctuations between the two adjacent rotors offset each other, thereby reducing the vibration noise of the motor during operation and improving the performance of the motor. Compared with the scheme of using linear skewed poles or V-shaped skewed poles for motor rotors in the related art, the present application adopts a staggered arrangement of multiple rotor segments, so that the torque fluctuations of the two adjacent rotor segments can offset each other, thereby reducing the vibration noise of the motor.

[0008] In a possible implementation of the present application, an even number of adjacent rotor segments among the multiple rotor segments form a rotor segment group, and reference magnetic pole center lines of the multiple rotor segments in the same rotor segment group all have angles with each other.

[0009] In a possible implementation of the present application, a plurality of rotor segment groups are included, and the layout of the rotor segments in the plurality of rotor segment groups is consistent.

[0010] In a possible implementation manner of the present application, a plurality of rotor segment groups are included, and the layout of the rotor segments in the plurality of rotor segment groups is symmetrical about a central cross section of the plurality of rotor segment groups.

[0011] In a possible implementation of the present application, two keys are provided on the inner side of the rotor segment, the rotor segment and the shaft body are matched through the keys, and the symmetry center lines of the two keys have an acute angle.

[0012] In a possible implementation of the present application, a rotor segment is evenly arranged with multiple pole pairs along its circumferential direction to form multiple pole center lines, and a pole center line located between the symmetric center lines of two keys is a reference pole center line.

[0013] In a possible implementation of the present application, the plurality of rotor segments include a first rotor segment, and an angle α exists between a reference magnetic pole centerline of the first rotor segment and a symmetric centerline of the key, where α can be calculated by the following formula:

[0014]

[0015] β=360 / (2*Z*n);

[0016] Where: Z is the number of stator teeth that match the electronic rotor, p is the number of pole pairs of the rotor segment, and n is the number of rotor segments.

[0017] In a possible implementation of the present application, the plurality of rotor segments include a second rotor segment, and an angle γ is included between a reference magnetic pole centerline of the second rotor segment and a reference magnetic pole centerline of the first rotor segment, where γ can be calculated by the following formula:

[0018]

[0019] In a possible implementation of the present application, the multiple rotor segments also include a third rotor segment and a fourth rotor segment, the third rotor segment is formed by flipping the first rotor segment 180° about the reference magnetic pole centerline, and the fourth rotor segment is formed by flipping the second rotor segment 180° about the reference magnetic pole centerline.

[0020] In a second aspect, an embodiment of the present application provides a motor, a motor stator and a motor rotor according to any one of the first aspects, wherein the motor rotor and the motor stator can rotate relative to each other.

[0021] The motor provided in the embodiment of the present application has the motor rotor in the first aspect and therefore has the same effect, that is, of two adjacent rotor segments, in the same direction, the reference magnetic pole center line of one rotor segment rotates counterclockwise by an acute angle, and the reference magnetic pole center line of the other rotor segment rotates clockwise by an acute angle, that is, on the basis of an acute angle between the reference magnetic pole center lines of the two adjacent rotor segments, a plurality of magnetic pole center lines are alternately arranged left and right along the extension direction of the shaft, and a staggered segmented rotor skewed pole form is adopted, so that the torque fluctuations between the two adjacent rotors cancel each other out, thereby reducing the vibration noise of the motor during operation and improving the performance of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic cross-sectional view of a motor provided in an embodiment of the present application;

[0023] Figure 2 A schematic diagram of the structure of a motor rotor provided in an embodiment of the present application;

[0024] Figure 3 A schematic diagram of the end surface structure of a motor rotor provided in an embodiment of the present application;

[0025] Figure 4 A schematic diagram of the shaft structure of a motor rotor provided in an embodiment of the present application;

[0026] Figure 5 A schematic diagram of the structure of a motor rotor provided in Example 1 of the present application;

[0027] Figure 6A schematic diagram of the structure of a motor rotor provided in Embodiment 2 of the present application;

[0028] Figure 7 The torque fluctuation curve of the motor rotor provided in the embodiment of the present application;

[0029] Figure 8 This is a vibration response curve of the motor rotor provided in an embodiment of the present application.

[0030] Reference numerals:

[0031] 1-housing; 2-motor stator; 21-stator winding; 3-motor rotor; 31-shaft; 311-keyway; 312-connecting part; 32-rotor segment; 321-through hole; 322-key; 323-magnet mounting part; 33-first rotor segment; 34-second rotor segment; 35-third rotor segment; 36-fourth rotor segment; 4-reference magnetic pole centerline; 5-symmetric centerline of the key. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the specific technical solution of the present application will be further described in detail below in conjunction with the drawings in the embodiments of the present application. The following embodiments are used to illustrate the present application, but are not used to limit the scope of the present application.

[0033] In the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, unless otherwise specified, "multiple" means two or more.

[0034] In addition, in the embodiments of the present application, directional terms such as "up", "down", "left" and "right" are defined relative to the orientation of the components in the drawings. It should be understood that these directional terms are relative concepts. They are used for relative description and clarification, and they may change accordingly according to the changes in the orientation of the components in the drawings.

[0035] In the embodiments of the present application, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium.

[0036] In the embodiments of the present application, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0037] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0038] An embodiment of the present application provides a motor, which is an electromagnetic device that realizes electric energy conversion or transmission based on the law of electromagnetic induction. Its main function is to generate driving torque and serve as a power source for various machines.

[0039] Reference Figure 1 The motor of the present application includes a housing 1, a motor stator 2 and a motor rotor 3, and the motor rotor 3 and the motor stator 2 can rotate relative to each other. The housing 1 is used to provide installation space for the motor stator 2 and the motor rotor 3, and to position the motor stator 2 and the motor rotor 3, wherein the motor stator 2 is fixed on the inner arm of the housing 1 to form a ring structure, the motor rotor 3 is arranged in the ring structure of the motor stator 2, and the two ends of the rotor are rotatably connected to the housing 1, when the motor is started, the motor stator 2 and the motor rotor 3 generate magnetic force between each other, so that the motor rotor 3 rotates to output torque.

[0040] Specifically, the motor stator 2 includes a plurality of stator windings 21, and the stator windings 21 are a single-phase electromagnetic circuit composed of a coil or a coil group. The plurality of stator windings 21 are evenly distributed in a ring shape along the inner circumference of the motor stator 2, and different currents are passed through the stator windings 21 to generate a rotating magnetic field. At the same time, the motor rotor 3 is coaxially arranged with the motor stator 2 and rotatably connected to the housing 1 to achieve relative rotation of the motor rotor 3 and the motor stator 2, so that after the stator is energized, the motor rotor 3 rotates under the action of magnetic force and outputs rotational power.

[0041] It should be noted that the shape of the coil winding and the embedded wiring method in the motor stator 2 are not limited in this application. For example, in one embodiment of the present application, the motor stator 2 adopts a centralized winding, which is simple to manufacture and low in cost; in another embodiment of the present application, the motor stator 2 adopts a distributed winding, and the winding structure is more complicated, but the motor performance is better.

[0042] On this basis, the present application embodiment provides a motor rotor 3, referring to Figure 2 The motor rotor 3 of the present application includes a shaft body 31 and a plurality of rotor segments 32. The rotor segments 32 are arranged in sequence along the axial direction of the shaft body 31, and two adjacent rotor segments 32 are in the same direction, with the reference magnetic pole center line 4 of one rotor segment 32 rotated counterclockwise by an acute angle, and the reference magnetic pole center line 4 of the other rotor segment 32 rotated clockwise by an acute angle.

[0043] The shaft body 31 provides a mounting base for the rotor segment 32. A plurality of rotor segments 32 can be arranged along the axial direction of the shaft body 31. A magnetic member is arranged on each rotor segment 32 to form a magnetic pole pair. After the motor is powered on, the magnetic pole pair on the rotor segment 32 interacts with the electromagnet on the motor stator 2, thereby causing the motor rotor 3 to rotate. Since the two adjacent rotor segments 32 of the present application are in the same direction, the reference magnetic pole center line 4 of one rotor segment 32 rotates counterclockwise by an acute angle, and the reference magnetic pole center line 4 of the other rotor segment 32 rotates clockwise by an acute angle, that is, the two adjacent rotor segments 3 On the basis that there is an acute angle between the reference magnetic pole center line 4 of 2, multiple magnetic pole center lines are alternately arranged left and right along the extension direction of the shaft body 31, and a staggered segmented rotor skewed pole form is adopted, so that the torque fluctuations between two adjacent rotors offset each other, thereby reducing the vibration noise of the motor during operation and improving the performance of the motor. Compared with the scheme of using linear skewed pole or V-shaped skewed pole for the motor rotor 3 in the related art, the present application adopts a staggered arrangement of multiple rotor segments 32, so that the torque fluctuations of two adjacent rotor segments 32 can offset each other, thereby reducing the vibration noise of the motor.

[0044] It should be noted that there are various forms of connection between the rotor segment 32 and the shaft body 31. For example, in one embodiment of the present application, the rotor segment 32 is connected to the shaft body 31 through a key or a spline. For example, in another embodiment of the present application, the rotor segment 32 and the shaft body 31 are interference fit.

[0045] Reference Figure 1 and 3In one implementation of the present application, two keys 322 are provided inside the rotor segment 32, and the rotor segment 32 and the shaft body 31 are matched through the keys 322, and the symmetry center lines 5 of the two keys have an acute angle. Specifically, a through hole 321 matching the shaft body 31 is opened in the middle of the rotor segment 32, so that the shaft body 31 can pass through, and two protruding square keys are provided on the inner wall of the through hole 321 of the rotor segment 32.

[0046] It should be noted that the shaft body 31 is provided with a plurality of key slots 311, and the key slots 311 extend along the axial direction of the shaft body 31. The number of the key slots 311 may be the same as the number of the rotor segments 32, or may be different. Figure 4 In one embodiment of the present application, four key slots 311 are provided on the shaft body 31. It is sufficient to ensure that two of the key slots 311 correspond to the positions of the keys 322 on the rotor segment 32. Multiple key slots 311 can be used to install multiple different rotor segments 32, which is also a way to achieve a staggered arrangement of the reference magnetic pole center lines 4 of the rotor segments 32. Connecting parts 312 are provided at both ends of the shaft body 31 for connecting to the housing 1 of the motor.

[0047] In addition, in order to ensure that the rotor segment 32 has magnetic properties so as to generate a mutual magnetic force with the motor rotor 3, refer to Figure 3 The rotor segment 32 has multiple pole pairs evenly arranged along its circumferential direction. The pole pairs are divided into N pole pairs and S pole pairs. The N pole pair includes two N pole magnets symmetrical about the center of the rotor segment 32, and the S pole pair includes two S pole magnets symmetrical about the center of the rotor segment 32. The N pole pairs and the S pole pairs are evenly spaced along the circumferential direction of the rotor segment 32. The pole center line is the average dividing line of two adjacent pole pairs. Multiple pole pairs can form multiple pole center lines.

[0048] The number of magnetic pole pairs is not limited in this application, refer to Figure 3 , in one embodiment of the present application, includes two N pole pairs and two S pole pairs.

[0049] In order to avoid the influence of the key 322 on the magnetic pole pair, the key 322 is usually not set in the middle position of the magnetic pole pair. Figure 3 In one embodiment of the present application, a magnetic pole center line is located between the symmetric center lines 5 of the two keys, so that the magnetic pole pair and the key 322 are misaligned. For ease of description, the magnetic pole center line is called the reference magnetic pole center line 4.

[0050] In order to facilitate the arrangement of the magnetic pole pairs on the rotor segment 32, a plurality of magnet mounting portions 323 are provided on the rotor segment 32, and the magnet mounting portions 323 are used to mount magnets. Specifically, the plurality of magnet mounting portions 323 are evenly distributed along the circumferential direction of the rotor segment 32, and each magnet mounting portion 323 has a magnet mounting portion 323 that is symmetrical with respect to the center of the rotor segment 32, that is, the two centrally symmetrical magnet mounting portions 323 are used to mount two magnets in the same magnetic pole pair.

[0051] The form of the magnet mounting portion 323 is not limited in this application. For example, in one embodiment of the present application, the magnet mounting portion 323 is a notch opened at the edge of the rotor segment 32, and the shape of the notch can be T-shaped, arc-shaped, etc.; in another embodiment of the present application, the magnet mounting portion 323 is a plurality of slots, and the extension squares of the slots are different, refer to Figure 3 In the embodiment of the present application, each magnet mounting portion 323 includes three slots, and the three slots form a triangle.

[0052] It should be noted that the material of the magnet is not limited in this application. Optional materials of the permanent magnet include aluminum nickel cobalt, ferrite, samarium cobalt, neodymium iron boron, etc.

[0053] In addition, in order to facilitate the assembly and manufacture of the rotor segment 32, optionally, the rotor segment 32 is composed of a plurality of rotor punchings stacked together. The rotor punchings can be made of materials such as iron and silicon steel, and are usually in the shape of discs. The rotor punchings in the same rotor segment 32 have the same structure. The rotor punchings in different rotor segments 32 can be set the same or different according to actual needs.

[0054] Since the key 322 affects the magnetic pole pair, it is inconvenient to set multiple keys 322 and key slots 311 to achieve the misalignment between the rotor segments 32. For this reason, multiple rotor segments 32 with different structures can be optionally set. For example, in one implementation of the present application, the multiple rotor segments include a first rotor segment 33, and the reference magnetic pole center line of the first rotor segment 33 and the symmetric center line 5 of the key have an angle α, where α can be calculated by the following formula:

[0055]

[0056] β=360 / (2*Z*n);

[0057] Wherein: Z is the number of stator teeth matched with this rotor, p is the number of pole pairs of the rotor segment, and n is the number of rotor segments 32.

[0058] In addition, the plurality of rotor segments include a second rotor segment 34, and the reference magnetic pole centerline 4 of the second rotor segment 34 and the reference magnetic pole centerline 4 of the first rotor segment 33 are at an angle γ, where γ can be calculated by the following formula:

[0059]

[0060] On this basis, the multiple rotor segments also include a third rotor segment 35 and a fourth rotor segment 36. The third rotor segment 35 is formed by flipping the first rotor segment 33 180° about the reference magnetic pole center line 4, and the fourth rotor segment 36 is formed by flipping the second rotor segment 34 180° about the reference magnetic pole center line 4.

[0061] In the embodiment of the present application, the first rotor segment 33, the second rotor segment 34, the third rotor segment 35 and the fourth rotor segment 36 are arranged in order, and the torque fluctuation curve of each rotor segment 32 is measured as follows: Figure 7 As shown, it can be seen that the torque fluctuation phases between adjacent segments differ by 90 degrees. Therefore, the torque fluctuation phases between segments 1 and 3 differ by 180 degrees, and the torque fluctuation phases between segments 2 and 4 also differ by 180 degrees. In the layout of the rotor segment 32, the first rotor segment 33 and the second rotor segment 34 are adjacent, and the torque fluctuations between the two have an offsetting effect. Similarly, the third rotor segment 35 and the fourth rotor segment 36 are adjacent, and the torque fluctuations between the two also have an offsetting effect.

[0062] It should be noted that the present application does not limit the number of rotor segments 32 . Optionally, the number of rotor segments 32 is four, six, eight, etc., and there are multiple arrangements of the rotor segments 32 in the present application.

[0063] In order to further improve the performance of the motor rotor 3 of the present application, refer to Figure 5 and Figure 6 In one embodiment of the present application, an even number of adjacent rotor segments 32 among a plurality of rotor segments 32 form a rotor segment group, and the reference magnetic pole center lines 4 of the plurality of rotor segments 32 in the same rotor segment group are at angles to each other, that is, in the same rotor segment group, the reference magnetic pole center lines 4 of each rotor segment 32 do not overlap, so as to form a more reasonable rotor segment 32 layout and improve its shock absorption performance.

[0064] In addition, the number of rotor segment groups is not limited in the present application. Optionally, the motor rotor 3 of the present application includes two rotor segment groups, and each rotor segment group includes four rotor segments 32 to form an eight-rotor segment motor rotor 3 layout.

[0065] Accordingly, there are multiple layouts of the rotor segments 32 in the multiple rotor segment groups. For example, in one embodiment of the present application, the motor rotor 3 includes multiple rotor segment groups, and the rotor segments 32 in the multiple rotor segment groups are arranged in a consistent manner; in another embodiment of the present application, the motor rotor 3 includes multiple rotor segment groups, and the layout of the rotor segments 32 in the multiple rotor segment groups is symmetrical about the central cross-section of the multiple rotor segment groups.

[0066] Reference Figure 5In the first embodiment of the present application, the motor shaft includes two rotor segment groups, each rotor segment group is composed of the above-mentioned first rotor segment 33, second rotor segment 34, third rotor segment 35 and fourth rotor segment 36. Specifically, in the first rotor segment group, the first rotor segment 33, the second rotor segment 34, the third rotor segment 35 and the fourth rotor segment 36 are arranged in order, and the fourth rotor segment 36 follows the first rotor segment. The second rotor segment group is arranged in the order of the first rotor segment 33, the second rotor segment 34, the third rotor segment 35 and the fourth rotor segment 36.

[0067] Reference Figure 6 In the second embodiment of the present application, the motor shaft includes two rotor segment groups, each rotor segment group is composed of the above-mentioned first rotor segment 33, second rotor segment 34, third rotor segment 35 and fourth rotor segment 36. Specifically, in the first rotor segment group, the first rotor segment 33, the second rotor segment 34, the third rotor segment 35 and the fourth rotor segment 36 are arranged in order, and the fourth rotor segment 36 follows the first rotor segment. In the second rotor segment group, the fourth rotor segment 36, the third rotor segment 35, the second rotor segment 34 and the first rotor segment 33 are arranged in sequence.

[0068] In order to facilitate the description of the beneficial effects of the above embodiments, Figure 8 It can be seen that no matter the layout in the first embodiment or the layout in the second embodiment is adopted, compared with the linear oblique pole layout in the related art, the vibration of the motor rotor 3 of the present application is reduced by at least 10 decibels in the medium and low frequency region.

[0069] The serial numbers of the embodiments of the present application are only for description and do not represent the advantages and disadvantages of the embodiments. The above are only preferred embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A motor rotor, characterized in that: include: Axis body; A plurality of rotor segments are sequentially arranged along the axial direction of the shaft body, and two adjacent rotor segments are arranged in the same direction, the reference magnetic pole center line of one rotor segment is rotated counterclockwise by an acute angle, and the reference magnetic pole center line of the other rotor segment is rotated clockwise by an acute angle; Two keys are arranged on the inner side of the rotor segment, and the rotor segment and the shaft body are matched with each other through the keys; The plurality of rotor segments include a first rotor segment, wherein a reference magnetic pole centerline of the first rotor segment and a symmetric centerline of the key form an angle α, wherein α can be calculated by the following formula: β=360 / (2*Z*n); Wherein: Z is the number of stator teeth matched with the motor rotor, p is the number of pole pairs of the rotor segment, and n is the number of the rotor segments; The plurality of rotor segments include a second rotor segment, and an angle γ is formed between a reference magnetic pole centerline of the second rotor segment and a reference magnetic pole centerline of the first rotor segment, wherein γ can be calculated by the following formula:

2. The motor rotor according to claim 1, characterized in that: An even number of adjacent rotor segments among the plurality of rotor segments form a rotor segment group, and reference magnetic pole center lines of the plurality of rotor segments in the same rotor segment group all have angles with each other.

3. The motor rotor according to claim 2, characterized in that: The invention comprises a plurality of rotor segment groups, and the rotor segments in the plurality of rotor segment groups have a consistent layout.

4. The motor rotor according to claim 2, characterized in that: A plurality of rotor segment groups are included, and the rotor segment layouts in the plurality of rotor segment groups are symmetrical about a central cross section of the plurality of rotor segment groups.

5. The motor rotor according to any one of claims 1 to 4, characterized in that: The symmetry center lines of the two bonds are at an acute angle.

6. The motor rotor according to claim 5, characterized in that: The rotor segment is evenly arranged with a plurality of magnetic pole pairs along its circumferential direction to form a plurality of magnetic pole center lines, and a magnetic pole center line located between two symmetric center lines of the keys is a reference magnetic pole center line.

7. The motor rotor according to claim 6, characterized in that: The plurality of rotor segments further include a third rotor segment and a fourth rotor segment. The third rotor segment is formed by flipping the first rotor segment 180° about a reference magnetic pole centerline, and the fourth rotor segment is formed by flipping the second rotor segment 180° about a reference magnetic pole centerline.

8. A motor, characterized in that: include: Motor stator; The motor rotor according to any one of claims 1 to 7, wherein the motor rotor and the motor stator are relatively rotatable.

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