Rotor, motor and vehicle

Abstract

The invention relates to a rotor, a motor and a vehicle, the rotor comprises a rotor body and a plurality of magnetic steels, a plurality of magnetic steel grooves are formed in the rotor body, the magnetic steels are arranged in the magnetic steel grooves, the number of the magnetic steels is the same as that of the magnetic steel grooves, and magnetic pole holes are formed in the position, close to the outer edge, of the rotor body. The magnetic pole holes are formed in the positions, close to the outer edge, of the rotor body to change a magnetic circuit of a magnetic field on the surface of the rotor, so that the sinusoidal property of air-gap magnetic steel of the motor is improved, the air-gap magnetic field harmonic quantity caused by the magnetic field on the surface of the rotor is weakened, the cogging torque, torque pulsation and electromagnetic radial force of the motor are reduced, and the NVH performance of the motor is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of motors, and in particular to a rotor, a motor, and a vehicle. Background Art

[0002] In the automotive field, the NVH (Noise, Vibration, Harshness) performance of motors is crucial. In related technologies, the high harmonics of the motor's back EMF increase the torque pulsation, causing vibration and noise, which may cause resonance of the mechanical system and damage the motor in severe cases. Summary of the invention

[0003] In order to overcome the problems existing in the related art, the present disclosure provides a rotor, a motor and a vehicle.

[0004] According to a first aspect of an embodiment of the present disclosure, a rotor is provided, comprising a rotor body and a plurality of magnets, wherein a plurality of magnet slots are formed on the rotor body, the magnets are arranged in the magnet slots, and the number of the magnets is the same as the number of the magnet slots, wherein a magnetic pole hole is arranged near the outer edge of the rotor body.

[0005] Optionally, in the radial direction, at least a portion of the magnetic pole hole is located between the radial outer edge of the magnetic steel and the radial outer edge of the rotor body.

[0006] Optionally, a dimension L of the magnetic pole hole along the circumferential direction of the rotor body is larger than a dimension W of the magnetic pole hole along the radial direction of the rotor body, and the dimension W of the magnetic pole hole is not larger than 1 / 2L.

[0007] Optionally, the angle between the center lines of two adjacent magnetic steels extending radially along the rotor body is a, and the dimension L of the magnetic pole hole along the circumferential direction of the rotor body corresponds to a central pole arc angle b of the rotor body that is not less than 1 / 12a and not greater than 1 / 9a.

[0008] Optionally, two magnetic pole holes are arranged between two adjacent magnetic steels, and the angle between the center lines of the two adjacent magnetic steels extending radially along the rotor body is a, and the angle between the center lines of the two magnetic pole holes extending radially along the rotor body is c, wherein c is not less than 1 / 4a and not greater than 1 / 3a.

[0009] Optionally, a magnetic isolation hole is provided on the rotor body, and the magnetic isolation hole is arranged at a corner close to the magnetic steel and away from the center of the rotor body.

[0010] Optionally, a spacing S2 between the magnetic isolation hole and an edge of the magnetic steel close to the outer edge of the rotor body is not greater than twice the aperture D of the magnetic isolation hole.

[0011] Optionally, the interval S3 between the magnetic isolation hole and the magnetic steel closest thereto is not greater than the aperture D of the magnetic isolation hole.

[0012] Optionally, the cross-sections of the magnetic steel and the magnetic steel slot are constructed as trapezoids that match each other in shape, the short side of the magnetic steel slot trapezoid of the magnetic steel slot is arranged close to the radial inner edge of the rotor body, and the long side of the magnetic steel slot trapezoid of the magnetic steel slot is arranged close to the radial outer edge of the rotor body.

[0013] Optionally, the short sides of the magnetic steel trapezoid of the magnetic steel are in contact with the short sides of the magnetic steel groove trapezoid, and the oblique sides of the magnetic steel groove trapezoid are in contact with the oblique sides of the magnetic steel trapezoid.

[0014] According to a second aspect of an embodiment of the present disclosure, a motor is provided, comprising the rotor provided by the present disclosure.

[0015] According to a third aspect of an embodiment of the present disclosure, a vehicle is provided, comprising the motor provided by the present disclosure.

[0016] The technical solution provided by the embodiments of the present disclosure may include the following beneficial effects: a magnetic pole hole is provided near the outer edge of the rotor body to change the magnetic circuit of the rotor surface magnetic field, thereby improving the sinusoidal nature of the motor air gap magnetic steel and weakening the air gap magnetic field harmonics caused by the rotor surface magnetic field, thereby reducing the motor tooth torque, torque pulsation, and electromagnetic radial force, thereby improving the NVH performance of the motor.

[0017] It is to 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 present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0019] Figure 1 is a schematic diagram showing a rotor equipped with a magnetic steel according to an exemplary embodiment; Figure 2 is a schematic diagram showing a magnetic steel being inserted into a magnetic steel slot according to an exemplary embodiment; Figure 3 is a schematic diagram showing a magnetic steel being installed in place in a magnetic steel slot according to an exemplary embodiment; Figure 4 is a partial schematic diagram of a rotor according to an exemplary embodiment; Figure 5 is a partial schematic diagram of a rotor according to another exemplary embodiment; Figure 6 is a partial schematic diagram of a rotor according to an exemplary embodiment; Figure 7 is a partial schematic diagram of a rotor according to another exemplary embodiment; Figure 8 is a partial schematic diagram of a rotor according to an exemplary embodiment; Fig. 9 is a partial schematic diagram of a rotor according to another exemplary embodiment; Fig.10 is a comparison diagram of cogging torques of different rotors according to an exemplary embodiment; Fig.11 is a torque pulsation comparison diagram of different rotors according to an exemplary embodiment; Fig.12 is a diagram showing a demagnetization effect of a rotor according to an exemplary embodiment; Fig.13 is a demagnetization effect diagram of a rotor shown in a comparative example; Fig.14 is a diagram showing a demagnetization effect of a rotor according to an exemplary embodiment; Fig.15 is a comparison diagram of back electromotive force of different rotors according to an exemplary embodiment.

[0020] Description of Reference Numerals 10-rotor body, 11-magnetic steel slot, 111-magnetic steel slot trapezoidal short side, 112-magnetic steel slot trapezoidal long side, 113-magnetic steel slot trapezoidal oblique side, 12-magnetic pole hole, 13-magnetic isolation hole, 20-magnet, 21-magnetic steel trapezoidal short side, 22-magnetic steel trapezoidal long side, 23-magnetic steel trapezoidal oblique side. DETAILED DESCRIPTION

[0021] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices consistent with some aspects of the present disclosure as detailed in the appended claims.

[0022] In the vehicle field, the NVH (Noise, Vibration, Harshness) performance of the motor is crucial. In related technologies, the back EMF harmonics of the motor are high, which leads to increased torque pulsation, causing vibration and noise. In severe cases, it may cause resonance of the mechanical system and damage the motor. The suspension pump of the vehicle suspension system consists of three parts: the motor, the oil pump, and the electronic control. Since the suspension pump needs to be started and stopped frequently under different working conditions, the NVH performance requirements of the motor are high. In the motor design, it is necessary to reduce the back EMF harmonics, reduce the torque pulsation and cogging torque as much as possible. At the same time, a reasonable rotor structure design can effectively reduce the risk of magnetic steel demagnetization.

[0023] To this end, the present disclosure provides a motor and a rotor thereof, wherein, with reference to Figure 1 As shown, the rotor includes a rotor body 10 and a plurality of magnetic steels 20. The rotor body 10 is formed with a plurality of magnetic steel slots 11. The magnetic steels 20 are arranged in the magnetic steel slots 11. The number of the magnetic steels 20 is the same as that of the magnetic steel slots 11. In order to make the magnetic steel slots 11 more clearly shown, Figure 1 FIG. 1 shows that a magnetic steel slot 11 is provided with a magnetic steel 20, and other magnetic steel slots 11 are not provided with magnetic steel 20. Figure 6 and Figure 7 A magnetic pole hole 12 is provided near the outer edge of the rotor body 10. The outer edge here refers to the radial outer edge of the rotor body 10, and the magnetic pole hole 12 close to the outer edge means that it is as close to the outer edge of the rotor body 10 as possible while meeting the manufacturing process requirements.

[0024] Through the above technical solution, a magnetic pole hole 12 is provided near the outer edge of the rotor body 10 to change the magnetic circuit of the rotor surface magnetic field, thereby improving the sinusoidal nature of the motor air gap magnetic steel and weakening the air gap magnetic field harmonics caused by the rotor surface magnetic field, thereby reducing the motor tooth torque, torque pulsation, and electromagnetic radial force, thereby improving the NVH performance of the motor.

[0025] In the present disclosure, refer to Figure 6 and Figure 7 , the interval S1 between the magnetic pole hole 12 and the outer edge of the rotor body 10 is not less than the thickness of the rotor body 10, so as to realize the stamping feasibility of the magnetic pole hole 12 and meet the manufacturing process requirements. The magnetic pole hole 12 in the embodiment of the present disclosure is as close to the outer edge of the rotor body 10 as possible while meeting the requirements of the manufacturing process. For example, the interval S1 can be equal to the thickness of the rotor body 10.

[0026] In one embodiment, in the radial direction, at least a portion of the magnetic pole hole 12 may be located between the radial outer edge of the magnetic steel 20 and the radial outer edge of the rotor body 10, that is, the outer edge of the magnetic pole hole 12 along the radial direction of the rotor body 10 radially outwardly exceeds the outer edge of the magnetic steel 20. This arrangement allows the magnetic pole hole 12 to be as close to the outer edge of the rotor body 10 as possible, so as to better improve the NVH performance of the motor.

[0027] Reference Figure 6 and Figure 7 , the dimension L of the magnetic pole hole 12 along the circumference of the rotor body 10 is greater than the dimension W of the magnetic pole hole 12 along the radial direction of the rotor body 10. According to a large number of experiments, setting the dimension L larger can improve the waveform of the air gap flux density. The air gap flux density closer to the sine wave can reduce the harmonic component, thereby reducing the eddy current loss (iron loss) and additional copper loss caused by harmonics, improving the overall efficiency, reducing vibration and noise, reducing torque pulsation, and extending the life of the motor. Setting the dimension W smaller can avoid increasing the magnetic resistance, minimize the energy loss and magnetic field distortion in the magnetic circuit, thereby improving efficiency, torque density and dynamic response, while reducing costs and heat loads.

[0028] Reference Figure 6 and Figure 7 , the size W of the pole hole 12 can be no less than the thickness of the rotor body 10 to ensure the feasibility of stamping.

[0029] In the disclosed embodiment, the size W of the magnetic pole hole 12 can be no greater than 1 / 2L. After a large number of experimental verifications, setting the size W to no greater than 1 / 2L can avoid the size being too large and affecting the magnetic resistance, resulting in a decrease in the back electromotive force, and the size W being too small, causing problems that are not conducive to stamping.

[0030] Reference Figure 4 and Figure 5 The included angle between the center lines of two adjacent magnetic steels 20 extending radially along the rotor body 10 is a, and the size L of the magnetic pole hole 12 corresponds to the central pole arc angle b of the rotor body 10 (i.e. Figure 4 and Figure 5 The angle formed by the dotted lines at both ends of the middle magnetic pole hole 12 is not less than 1 / 12a and not greater than 1 / 9a. After a large number of experimental verifications, within this range, it can be guaranteed that the magnetic pole hole 12 has a positive effect on improving the air gap flux density waveform. The air gap flux density that is closer to a sine wave can reduce the harmonic component, thereby reducing the eddy current loss (iron loss) and additional copper loss caused by harmonics, improving the overall efficiency, reducing vibration and noise, reducing torque pulsation, and extending the life of the motor. If the center pole arc angle b is too large or too small, it will result in a small impact on the air gap density waveform or a negative impact.

[0031] Reference Figure 4 and Figure 5, two magnetic pole holes 12 are arranged between two adjacent magnetic steels 20, the angle between the center lines of the two adjacent magnetic steels 20 extending radially along the rotor body 10 is a, and the angle between the center lines of the two magnetic pole holes 12 extending radially along the rotor body 10 is c, wherein c is not less than 1 / 4a and not greater than 1 / 3a. After a large number of experimental verifications, if the angle c is too small, the two adjacent magnetic steels 20 will be too close to the middle, and if the angle c is too large, the two adjacent magnetic steels 20 will be too close to the two ends. According to simulation calculations, the magnetic steel 20 is too close to the middle or the two ends, and the improvement effect on the motor performance is poor.

[0032] In the embodiment of the present disclosure, the cross section of the magnetic pole hole 12 can be configured as follows: Figure 5 and Figure 7 Alternatively, it can be constructed as an ellipse as shown. Figure 6 and Figure 8 The rectangle shown.

[0033] Reference Figures 6 to 9 The rotor body 10 may be provided with a magnetic isolation hole 13, which is provided at a corner close to the magnetic steel 20 and away from the center of the rotor body 10. The magnetic isolation hole 13 can improve the magnetic leakage due to the corner position of the magnetic steel 20, increase the fundamental wave of the air gap density, thereby increasing the torque of the motor, and at the same time reduce the self-demagnetization magnetic field strength of the magnetic steel 20 in the rotor body 10, so as to reduce the demagnetization risk of the magnetic steel.

[0034] The aperture D of the magnetic isolation hole 13 can be set to be greater than or equal to twice the thickness of the rotor body 10 to ensure the feasibility of stamping the magnetic isolation hole 13. The rotor body 10 is usually provided with a shoulder at the radial outer edge of the magnetic steel 20. The thickness of the shoulder is usually two to three times the thickness of the rotor body 10. Therefore, the aperture D is set to be greater than or equal to twice the thickness of the rotor body 10 to ensure the anti-demagnetization effect at the outer corner of the magnetic steel 20. The cross section of the magnetic isolation hole 13 can be circular or square. When it is a square, the aperture D refers to the side length of the square, such as Figure 8 shown.

[0035] Among them, the interval S2 between the magnetic isolation hole 13 and the edge of the magnetic steel 20 close to the outer edge of the rotor body 10 (that is, the long side 22 of the magnetic steel trapezoid described below) is not greater than twice the aperture D of the magnetic isolation hole 13, so as to avoid the corner of the magnetic steel 20 close to the radial outside being too far away, which affects the anti-demagnetization effect at the corner, thereby preventing local demagnetization and avoiding air gap magnetic field distortion and increasing torque pulsation.

[0036] The interval S3 between the magnetic isolation hole 13 and the magnetic steel 20 closest thereto is not greater than the diameter D of the magnetic isolation hole 13 to avoid affecting the magnetic isolation effect due to the excessive distance, thereby reducing magnetic leakage and electromagnetic interference.

[0037] Figures 10 to 15The performance comparison diagram of the embodiment of the present disclosure and the comparative example is shown. Among them, the comparative example is an example in which no magnetic isolation holes and magnetic pole holes are set, that is, the one marked as no hole in the figure is the comparative example, and the embodiment 1 is Figure 7 and Fig. 9 The embodiment shown, embodiment 2 is Figure 6 and Figure 8 The embodiment shown. Fig.12 This is the demagnetization effect diagram of the comparative example. Fig.13 This is a diagram of the demagnetization effect of Example 1. Fig.14 This is a diagram showing the demagnetization effect of Example 2.

[0038] In the disclosed embodiment, the cross-sections of the magnetic steel 20 and the magnetic steel slot 11 are configured as trapezoids that match each other in shape, the magnetic steel slot trapezoid short side 111 of the magnetic steel slot 11 is arranged close to the radial inner edge of the rotor body 10, and the magnetic steel slot trapezoid long side 112 of the magnetic steel slot 11 is arranged close to the radial outer edge of the rotor body 10. Accordingly, it can be understood that the magnetic steel trapezoid short side 21 of the magnetic steel 20 is arranged close to the radial inner edge of the rotor body 10, and the magnetic steel trapezoid long side 22 of the magnetic steel 20 is arranged close to the radial outer edge of the rotor body 10. That is to say, compared with the rectangular magnetic steel, under the premise that the amount of permanent magnets remains unchanged, the size of the magnetic steel 20 is reduced in the radial inner area with a smaller circumferential space, and the size of the area on the air gap side of the magnetic steel 20 close to the radial outer side is increased.

[0039] Through the above technical solution, by setting a trapezoidal magnet 20, the anti-demagnetization performance of the corners of the magnet 20 close to the radial outside can be increased, and the space left for the rotor body 10 in the area close to the radial inside of the magnet 20 becomes larger, so that the magnetic resistance of the rotor magnetic circuit is reduced, and the magnetic field saturation of the rotor near the radial inside position can be reduced, thereby increasing the rotor back electromotive force and improving the NVH performance of the motor.

[0040] In the present disclosure, refer to Figure 1 A plurality of magnetic steel slots 11 are evenly distributed in the circumferential direction of the rotor body 10 and are configured in a spoke shape extending in the radial direction, that is, the rotor is configured as a spoke rotor. The motor power density of this structure is relatively high.

[0041] When the magnet and the magnet slot are both rectangular, a gap needs to be reserved between the side of the magnet and the inner wall of the magnet slot to facilitate the axial insertion of the magnet into the magnet slot. However, the presence of this gap will increase the magnetic resistance of the rotor magnetic circuit. In the disclosed embodiment, the magnet slot 11 is configured as follows: Figure 2 As shown, when the long side 22 of the magnetic steel trapezoid of the magnetic steel 20 is attached to the long side 112 of the magnetic steel slot trapezoid, there is an installation gap between the oblique sides 113 of the magnetic steel slot trapezoid on both sides of the magnetic steel slot 11 and the oblique sides 23 of the magnetic steel trapezoid on both sides of the magnetic steel 20, and as shown in FIG. Figure 3As shown, when the short side 21 of the magnetic steel trapezoid of the magnetic steel 20 is in contact with the short side 111 of the magnetic steel slot trapezoid, the trapezoidal oblique side 113 of the magnetic steel slot is in contact with the trapezoidal oblique side 23 of the magnetic steel. When installing the magnetic steel 20 into the magnetic steel slot 11, the magnetic steel 20 can be first inserted into the magnetic steel slot 11 along the axial direction (i.e., the direction perpendicular to the drawing) along the trapezoidal long side 112 of the magnetic steel slot. At this time, there is a gap between the oblique sides 23 of the magnetic steel trapezoid on both sides of the magnetic steel 20 and the oblique sides 113 of the magnetic steel slot, so as to facilitate the insertion of the magnetic steel 20. After completing the above steps, the magnetic steel 20 is pushed inwardly in the radial direction of the rotor body 10 in the magnetic steel slot 11, so that the short side 21 of the magnetic steel trapezoid of the magnetic steel 20 is in contact with the short side 111 of the magnetic steel slot trapezoid, so as to present the following figure: Figure 3 The state shown is the state where the magnet 20 is installed in the working position. In this state, the trapezoidal oblique edges 23 on both sides of the magnet 20 fit with the trapezoidal oblique edges 113 on both sides of the magnet slot 11, thereby avoiding the existence of air magnetic resistance.

[0042] In one embodiment, the installation gap may be 0.1 mm to 0.2 mm, so as to ensure smooth installation without making the gap too large to increase magnetic resistance.

[0043] Among them, when the magnet 20 is installed in place, the short side 21 of the magnet trapezoid fits with the short side 111 of the magnet slot trapezoid, and a non-magnetic structure is filled between the long side 22 of the magnet trapezoid and the long side 112 of the magnet slot trapezoid to ensure the radial stability of the magnet 20 in the magnet slot 11, to avoid shaking and generating gaps that increase the magnetic resistance and affect the motor performance.

[0044] like Figure 2 and Figure 3 As shown, the two magnetic poles of the magnet 20 are distributed along the arrangement direction of the two oblique sides 23 of the magnet trapezoid, that is, along Figure 2 and Figure 3 By eliminating the gap between the two magnetic steel trapezoidal oblique sides 23 and the magnetic steel slot trapezoidal oblique sides 113, the increase of magnetic resistance in the direction of magnetic pole distribution can be effectively avoided.

[0045] In the disclosed embodiment, the angle between the short side 21 of the magnetic steel trapezoid and the oblique side 23 of the magnetic steel trapezoid of the magnetic steel 20 is greater than 90 degrees and less than 105 degrees, so as to improve the anti-demagnetization performance of the magnetic steel 20, while avoiding the angle being too large, which may cause the corners of the magnetic steel 20 near the radial outside to be too sharp, which is not conducive to processing or cause stress concentration.

[0046] According to a second aspect of an embodiment of the present disclosure, a motor is provided. The motor includes the above-mentioned rotor and has all the beneficial effects of the above-mentioned rotor, which will not be described in detail here.

[0047] The suspension pump system needs to start and stop frequently under different working conditions, and the NVH design of the motor is crucial. The suspension pump is the main component of the suspension system, and the suspension pump consists of three major parts: a motor, an oil pump, and an electronic control. When the motor in the embodiment of the present disclosure is applied to the suspension system, the anti-demagnetization performance of the outer corners is increased by adopting trapezoidal magnets; and the trapezoidal magnets can be inserted from the outer edge and pushed inward to contact the rotor body, thereby reducing the magnetic resistance of the rotor magnetic circuit and increasing the motor back electromotive force; in addition, the use of trapezoidal magnets has a narrow width near the radial inner side, and the space left for the rotor body becomes larger, which can reduce the magnetic field saturation of the inner position of the rotor, thereby increasing the rotor back electromotive force. The magnetic pole holes can effectively improve the torque pulsation of the motor, and the magnetic isolation holes can effectively reduce the risk of demagnetization of the magnets.

[0048] According to a third aspect of an embodiment of the present disclosure, a vehicle is provided, comprising the motor provided by the present disclosure and having all the beneficial effects of the above-mentioned motor, which will not be described in detail here.

[0049] In addition, the word "exemplary" is used herein to indicate serving as an example, instance, or diagram. Any aspect or design described as "exemplary" in this article is not necessarily understood to be advantageous compared to other aspects or designs. On the contrary, the use of the word exemplary is intended to present concepts in a specific way. As used herein, the term "or" is intended to represent an inclusive "or" rather than an exclusive "or". That is, unless otherwise specified or clear from the context, "X applies A or B" is intended to represent any one of the natural inclusive arrangements. That is, if X applies A; X applies B; or X applies both A and B, "X applies A or B" is satisfied under any of the aforementioned examples. In addition, unless otherwise specified or clearly pointed to a singular form from the context, the articles "one" and "an" as used in this application and the appended claims are generally understood to mean "one or more".

[0050] Likewise, although the present disclosure has been shown and described with respect to one or more implementations, equivalent variations and modifications will occur to those skilled in the art after reading and understanding the specification and drawings. The present disclosure includes all such modifications and variations and is limited only by the scope of the claims. In particular, with respect to the various functions performed by the components (e.g., elements, resources, etc.) described above, unless otherwise indicated, the terms used to describe such components are intended to correspond to any component (functionally equivalent) that performs the specific functions of the described components, even if the structure is not equivalent to the disclosed structure. In addition, although specific features of the present disclosure may have been disclosed with respect to only one of several implementations, such features may be combined with one or more other features of other implementations as may be desired and beneficial to any given or specific application. In addition, with respect to "including", "having", "having", "having", or variations thereof used in a specific embodiment or claim, such terms are intended to be inclusive in a manner similar to the term "comprising".

[0051] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any modification, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

[0052] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

[0053] In the above detailed description, reference is made to the accompanying drawings, which illustrate specific aspects of the present disclosure that can be practiced by way of illustration. In this regard, terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating directions or representing positional relationships, can be used with reference to the orientation of the described figures. Since the components of the described device can be positioned in a plurality of different orientations, directional terms can be used for illustrative purposes rather than restrictive. It should be understood that other aspects can be utilized and structural or logical changes can be made without departing from the concepts of the present disclosure. Therefore, the following detailed description should not be considered in a limiting sense.

[0054] It should be understood that, unless otherwise specifically noted, the features of some embodiments of the various present disclosures described herein may be combined with each other. As used herein, the term "and / or" includes any one of the related listed items and any combination of any two or more; similarly, "at least one of . . . " includes any one of the related listed items and any combination of any two or more.

[0055] It should be understood that, unless otherwise clearly specified and limited, the terms "joining", "attaching", "installing", "connecting", "connecting", "fixing" and the like used in the embodiments of the present disclosure should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For ordinary technicians in this field, the specific meanings of the above terms in this article can be understood according to specific circumstances.

[0056] In addition, the term "above" used in relation to a component, element or material layer formed "above" or located "above" a surface may be used herein to indicate that the component, element or material layer is "indirectly" positioned (e.g., placed, formed, deposited, etc.) on the surface such that one or more additional components, elements or layers are arranged between the surface and the component, element or material layer. However, the term "above" used in relation to a component, element or material layer formed "above" or located "above" a surface may also optionally have a specific meaning: the component, element or material layer is "directly" positioned (e.g., placed, formed, deposited, etc.) on the surface, such as in direct contact with the surface.

[0057] Although terms such as "first", "second" and "third" can be used herein to describe various components, parts, regions, layers or sections, these components, parts, regions, layers or sections are not limited to these terms. On the contrary, these terms are only used to distinguish one component, component, region, layer or section from another component, component, region, layer or section. Therefore, without departing from the teachings of each example, the first component, component, region, layer or section mentioned in the examples described herein may also be referred to as the second component, component, region, layer or section. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first" and "second" may expressly or implicitly include at least one of the features. In the description herein, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0058] It should be understood that spatially relative terms such as "above", "upper", "below", and "lower" are used herein to describe the relationship of one element to another element shown in the figures. In addition to the orientation depicted in the drawings, such spatially relative terms are also intended to include different orientations of the device in use or operation. For example, if the device in the drawings is turned over, the element described as being "above" or "upper" relative to another element will be "below" or "lower" relative to the other element. Therefore, depending on the spatial orientation of the device, the term "above" includes both upper and lower orientations. The device may have other orientations (e.g., rotated 90 degrees or in other orientations), and the spatially relative terms used herein should be interpreted accordingly.

Claims

1. A rotor, characterized in that: It includes a rotor body and a plurality of magnets, wherein a plurality of magnet slots are formed on the rotor body, the magnets are arranged in the magnet slots, and the number of the magnets is the same as the number of the magnet slots, wherein a magnetic pole hole is arranged near the outer edge of the rotor body.

2. The rotor according to claim 1, characterized in that In the radial direction, at least a portion of the magnetic pole hole is located between the radial outer edge of the magnetic steel and the radial outer edge of the rotor body.

3. The rotor according to claim 1, characterized in that A dimension L of the magnetic pole hole along the circumferential direction of the rotor body is greater than a dimension W of the magnetic pole hole along the radial direction of the rotor body, and the dimension W of the magnetic pole hole is not greater than 1 / 2L.

4. The rotor according to claim 1, characterized in that The included angle between the center lines of two adjacent magnetic steels extending radially along the rotor body is a, and the dimension L of the magnetic pole hole along the circumferential direction of the rotor body corresponds to a central pole arc angle b of the rotor body that is not less than 1 / 12a and not greater than 1 / 9a.

5. The rotor according to claim 1, characterized in that Two magnetic pole holes are arranged between two adjacent magnetic steels, and the angle between the center lines of the two adjacent magnetic steels extending radially along the rotor body is a, and the angle between the center lines of the two magnetic pole holes extending radially along the rotor body is c, wherein c is not less than 1 / 4a and not greater than 1 / 3a.

6. The rotor according to claim 1, characterized in that The rotor body is provided with a magnetic isolation hole, and the magnetic isolation hole is arranged at a corner close to the magnetic steel and away from the center of the rotor body.

7. The rotor according to claim 6, characterized in that A spacing S2 between the magnetic isolation hole and an edge of the magnetic steel close to the outer edge of the rotor body is not greater than twice the aperture D of the magnetic isolation hole.

8. The rotor according to claim 6, characterized in that The interval S3 between the magnetic isolation hole and the magnetic steel closest thereto is not greater than the aperture D of the magnetic isolation hole.

9. The rotor according to claim 1, characterized in that The cross-sections of the magnetic steel and the magnetic steel slot are constructed as trapezoids that match each other in shape, the short side of the magnetic steel slot trapezoid of the magnetic steel slot is arranged close to the radial inner edge of the rotor body, and the long side of the magnetic steel slot trapezoid of the magnetic steel slot is arranged close to the radial outer edge of the rotor body.

10. The rotor according to claim 9, characterized in that The short side of the magnetic steel trapezoid of the magnetic steel is in contact with the short side of the magnetic steel groove trapezoid, and the oblique side of the magnetic steel groove trapezoid is in contact with the oblique side of the magnetic steel trapezoid.

11. A motor, characterized in that: Comprising a rotor according to any one of claims 1-10.

12. A vehicle, characterized in that: Comprising an electric machine according to claim 11.

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