Rotor, electric machine and vehicle

Abstract

This invention provides a rotor, a motor, and a vehicle. The rotor includes: a rotor core; and multiple magnets, including a first magnet, a second magnet, and a third magnet. The rotor core includes: a core body with a magnet mounting portion. The magnet mounting portion includes: a first magnet slot group for mounting the first magnet, including a first magnet slot, the first magnet slot including a first sub-magnet slot, the included angle between the slot walls of two first sub-magnet slots near the axis being α1; a second magnet slot group for mounting the second magnet, including a second magnet slot, the second magnet slot including a second sub-magnet slot, the included angle between the slot walls of two second sub-magnet slots near the axis being α2; and a third magnet slot group for mounting the third magnet, including a third magnet slot, the included angle between the slot walls of two third magnet slots located on opposite sides of the axis being α3, where α3 > α1 > α2. This structure increases the reluctance torque ratio, reduces the amount of magnets used, and effectively increases the power density of the motor.

Description

Technical Field

[0001] This invention relates to the field of electric motor technology, and more specifically, to a rotor, an electric motor, and a vehicle. Background Technology

[0002] In related technologies, the rotor of an electric motor typically features a single-layer or double-layer V-shaped magnetic pole structure. This structure results in relatively low torque density and poor motor efficiency. While adding multiple layers of V-shaped magnetic slots at the rotor's magnetic poles can increase reluctance torque and improve torque density, it also increases the motor's cost. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0004] Therefore, the first objective of this invention is to provide a rotor.

[0005] The second objective of this invention is to provide an electric motor.

[0006] The third objective of this invention is to provide a vehicle.

[0007] To achieve at least one of the above objectives, according to a first aspect of the present invention, a rotor is provided, comprising: a rotor core; and a plurality of magnets mounted on the rotor core, the plurality of magnets including a plurality of first magnets, a plurality of second magnets, and a plurality of third magnets; wherein the rotor core comprises: a core body, the core body having a plurality of magnet mounting portions arranged sequentially along the circumference of the core body, the magnet mounting portions being used to mount magnets, the magnet mounting portions including: a first magnet slot group for mounting first magnets, the first magnet slot group including at least two first magnet slots, the at least two first magnet slots being symmetrically arranged with respect to the axis of the core body, the first magnet slots including at least two first sub-magnet slots, the at least two first sub-magnet slots being arranged sequentially along a direction away from the axis, the included angle between the slot walls of the two first sub-magnet slots close to the axis and symmetrical with respect to the axis being α1; and a second magnet slot group for mounting second magnets, the second magnet slot group including at least two second magnet slots, the at least two second magnet slots being symmetrical with respect to the axis of the core body. The first magnet slot is located on the side of the first magnet slot facing the center of the iron core body, along the radial direction of the iron core body. The second magnet slot includes at least two second sub-magnet slots, which are arranged sequentially in a direction away from the axis. The included angle between the slot walls of two second sub-magnet slots that are close to and symmetrical with respect to the axis is α2. A third magnet slot group is used to install the third magnet. The third magnet slot group includes at least two third magnet slots, which are located on opposite sides of the axis, along the radial direction of the iron core body. In the radial direction, the third magnet slot is located on the side of the first magnet slot away from the center of the iron core body, and the included angle between the slot walls of the two third magnet slots located on both sides of the axis is α3; where α1, α2 and α3 satisfy α3>α1>α2; the included angle between the slot wall of the first sub-magnet slot away from the axis and the axis is θ1, and α1 and θ1 satisfy α1 / 4≤θ1<α1 / 2; the included angle between the slot wall of the second sub-magnet slot away from the axis and the axis is θ2, and α2 and θ2 satisfy α2 / 4≤θ2<α2 / 2.

[0008] The rotor proposed in this application includes a rotor core and multiple magnets, with the magnets mounted on the rotor core. The magnets can be a combination of high-remanence rare-earth permanent magnet materials and low-coercivity ferrite materials. Specifically, for applications with harsh conditions and high requirements for magnet demagnetization, all magnets can be made of high-remanence rare-earth permanent magnet materials. For applications with lower demagnetization requirements but stringent cost constraints, some magnets can be made of high-remanence rare-earth permanent magnet materials, while others can be made of low-coercivity ferrite materials, thus reducing motor costs while mitigating the risk of motor demagnetization.

[0009] Furthermore, the rotor core includes a core body, on which multiple magnet mounting portions are provided for mounting magnets. Specifically, the multiple magnet mounting portions are arranged sequentially along the circumference of the core body, with the magnet mounting portions close to the outer periphery of the core body, and a distance between any two adjacent magnet mounting portions. When magnets are mounted in the magnet mounting portions, the multiple magnets mounted in the same magnet mounting portion together form a single magnetic pole.

[0010] Furthermore, the plurality of magnets includes a plurality of first magnets, a plurality of second magnets, and a plurality of third magnets. The magnet mounting section includes a first magnet slot group, a second magnet slot group, and a third magnet slot group, which are used to mount the first magnets, the second magnets, and the third magnets, respectively. The third magnet slot group, the first magnet slot group, and the second magnet slot group are arranged sequentially along the radial direction of the iron core body. Along the radial direction of the iron core body, the second magnet slot group is located on the side of the first magnet slot group facing the center of the rotor iron core, and the third magnet slot group is located on the side of the first magnet slot group away from the center of the rotor iron core. By setting the first magnet slot group, the second magnet slot group, and the third magnet slot group in the magnet mounting section, a three-layer structure is formed, thereby increasing the saliency ratio of the motor, increasing the reluctance torque ratio, reducing the amount of magnets used, effectively increasing the power density of the motor, and simultaneously reducing the motor cost.

[0011] Furthermore, the first magnet slot group includes at least two first magnet slots, which are symmetrically arranged with respect to the axis of the iron core body. The first magnet slots are used to mount first magnets, and multiple first magnets are symmetrically mounted in the first magnet slots on both sides of the axis with respect to the axis of the iron core body. In one possible technical solution, the first magnet slots on both sides of the axis are arranged in a V-shape. Each first magnet slot includes at least two first sub-magnet slots, each capable of mounting at least one first magnet. This increases the number of first magnets in the first magnet slots, further improving the power density of the motor, providing direct-axis permanent magnet flux to the motor, increasing the torque density of the motor, and improving the permanent magnet torque of the motor.

[0012] Furthermore, the second magnet slot group includes at least two second magnet slots, which are symmetrically arranged with respect to the axis of the iron core body. The second magnet slots are used to mount second magnets, and multiple second magnets are symmetrically mounted in the second magnet slots on both sides of the axis with respect to the axis of the iron core body. In one possible technical solution, the second magnet slots on both sides of the axis are arranged in a V-shape. Each second magnet slot includes at least two second sub-magnet slots, each capable of mounting at least one second magnet. This increases the number of second magnets in the second magnet slots, further improving the power density of the motor, providing direct-axis permanent magnet flux to the motor, increasing the torque density of the motor, and improving the permanent magnet torque of the motor. Along the radial direction of the iron core body, the second magnet slot is located on the side of the first magnet slot facing the center of the iron core body, i.e., the second magnet slot is located on the side of the first magnet slot facing the center of the iron core body.

[0013] The third magnet slot group includes at least two third magnet slots, which are symmetrically arranged with respect to the axis of the iron core body. Multiple third magnets are symmetrically installed in the third magnet slots on both sides of the axis with respect to the axis of the iron core body. In one possible technical solution, the third magnet slots on both sides of the axis are arranged in a V-shape. This allows the first, second, and third magnet slots to form a three-layer structure, thereby further increasing the saliency ratio of the motor, improving the reluctance torque ratio, reducing the amount of magnets used, effectively increasing the power density of the motor, and reducing the motor cost. The third magnet slot is located on the side of the first magnet slot away from the center of the iron core body. Along the direction away from the center of the iron core body, the second, first, and third magnet slots are arranged radially in sequence.

[0014] In one possible technical solution, the first magnet slot includes two first sub-magnet slots, in which two first magnets can be installed; the second magnet slot includes two second sub-magnet slots, in which two second magnets can be installed; and the third magnet slot can only install one third magnet.

[0015] Furthermore, a portion of the main magnetic flux flowing from the stator teeth into the rotor of the motor flows approximately circumferentially along the magnetic path formed between the first and third magnet slots and between the first and second magnet slots. On the other hand, the magnetic flux flows along a path connecting the third magnet, the first magnet, and the second magnet, in a direction approximately radial to the rotor core. This magnetic flux flows not only approximately radially but also a portion of it approximately circumferentially. For example, the magnetic flux output from the first magnet (or second magnet) located to the right of the pole centerline advances approximately circumferentially not only toward the first magnet (or second magnet) in the first sub-magnet slot (or second sub-magnet slot) also located to the right of the pole centerline but also toward the first magnet located to the left of the pole centerline. Thus, the circumferentially flowing magnetic flux increases as it approaches the pole center. As a result, near the pole center, both the main magnetic flux and the magnetic flux run in parallel circumferentially, making it easier to increase the magnetic flux density. When the magnetic flux density increases excessively and saturates, the reluctance torque and magnet torque decrease, resulting in a decrease in the output torque of the permanent magnet motor. To avoid such magnetic saturation, both the first and second magnet slots adopt a radially layered structure, i.e., the first magnet slot includes at least two first sub-magnet slots, and the second magnet slot includes at least two second sub-magnet slots. The width of the magnetic circuit increases as it approaches the magnetic pole center where magnetic flux is easily concentrated.

[0016] Furthermore, at least two first sub-magnet slots are sequentially arranged in a direction away from the axis. The angle between the slot walls of the two first sub-magnet slots that are close to the axis and symmetrical with respect to the axis is α1, and the angle between the slot wall of the first sub-magnet slot that is far from the axis and the axis is θ1. α1 and θ1 satisfy α1 / 4 ≤ θ1 < α1 / 2. At least two second sub-magnet slots are sequentially arranged in a direction away from the axis. The angle between the slot walls of the two second sub-magnet slots that are close to the axis and symmetrical with respect to the axis is α2, and the angle between the slot wall of the second sub-magnet slot that is far from the axis and the axis is θ2. α2 and θ2 satisfy α2 / 4 ≤ θ2 < α2 / 2. By setting θ1 to be greater than or equal to α1 / 4 and θ2 to be greater than or equal to α2 / 4, the magnetic circuit width near the magnetic pole center, where the main magnetic flux and the magnetic flux of the magnets are easily paralleled, can be expanded, effectively preventing magnetic saturation and further improving the output torque of the motor.

[0017] Furthermore, if the first and second magnet slots are made straight, i.e., θ1 = α1 / 2 and θ2 = α2 / 2, the magnetic path width near the center of the magnetic poles becomes excessively large. This makes it difficult for the magnetic flux output from one first or second magnet to flow to the other, resulting in leakage flux. To reduce this leakage flux and increase the effective magnet flux, this application sets the first and second magnet slots to a curved shape, i.e., θ1 < α1 / 2 and θ2 < α2 / 2. By adopting the above structure, it is possible to avoid magnetic saturation while maintaining a suitable distance between the two first magnets and the two second magnets, reducing leakage flux, further increasing the reluctance torque ratio, increasing the power density of the motor, and correspondingly reducing the amount of magnets used, thus lowering the production cost of the motor.

[0018] Furthermore, the included angle between the walls of the two third magnet slots located on both sides of the axis is α3, where α1, α2 and α3 satisfy α3>α1>α2.

[0019] Understandably, α1, α2, and α3 are the pole angles of each magnet slot. The size of the pole angles directly affects the direction of the magnetic field lines. In a multi-pole magnetic circuit, if the angle between multiple third magnets near the stator is too small, the magnetic field line path will become longer, increasing leakage flux and weakening the motor's torque output capability. Simultaneously, harmonics will increase, leading to increased motor torque pulsation and noise. To address these issues, this application performs the above numerical matching on the pole angles. Along the radial direction of the rotor core from the inside out (i.e., away from the center of the rotor core), the pole angles gradually increase, i.e., α3 > α1 > α2. This effectively reduces the magnetic field line path, weakens leakage flux, ensures the motor's torque output capability, reduces harmonics, eliminates motor torque pulsation as much as possible, and lowers motor noise.

[0020] Furthermore, in this rotor structure, the combined magnetomotive force of a magnetic pole is generated by the combined action of the first, second, and third magnets, and the waveform of the combined magnetomotive force includes both fundamental and harmonic components. By simultaneously matching θ1 and α1, and θ2 and α2 as described above, the waveform of the combined magnetomotive force can be optimized, effectively suppressing harmonic components in the waveform, improving the sinusoidal nature of the air gap magnetic field waveform, thereby reducing the cogging torque and torque ripple of the motor, decreasing motor vibration and noise, and allowing for more flexible optimization of the waveform of the combined magnetomotive force to meet product requirements.

[0021] The rotor according to the present invention may also have the following distinguishing technical features:

[0022] In some technical solutions, the first magnet slot may optionally include a first connecting portion for connecting two adjacent first sub-magnet slots; the second magnet slot may also include a second connecting portion for connecting two adjacent second sub-magnet slots.

[0023] In this technical solution, the structures of the first magnet slot and the second magnet slot are further defined. The first magnet slot also includes a first connecting portion, which is used to connect two adjacent first sub-magnet slots. Specifically, a first connecting portion is provided between any two adjacent first sub-magnet slots, and both ends of the first connecting portion are respectively connected to the two first magnet slots, so that the two adjacent first magnet slots are not isolated and do not form a magnetic bridge structure. The second magnet slot also includes a second connecting portion, which is used to connect two adjacent second sub-magnet slots. Specifically, a second connecting portion is provided between any two adjacent second sub-magnet slots, and both ends of the second connecting portion are respectively connected to the two second magnet slots, so that the two adjacent first magnet slots are not isolated and do not form a magnetic bridge structure.

[0024] By providing a first connecting portion and a second connecting portion in the first magnet slot and the second magnet slot, adjacent first sub-magnet slots can be connected through the first connecting portion, and adjacent second sub-magnet slots can be connected through the second connecting portion. This prevents the formation of magnetic bridge structures in the first and second magnet slots, making the motor's magnetic circuit structure more flexible and adjustable, and effectively reducing eddy current losses in the magnets within the slots, thus improving motor efficiency. Furthermore, the first connecting portion ensures continuous and stable magnetic flux in the first magnet slot, and the second connecting portion ensures continuous and stable magnetic flux in the second magnet slot. This lengthens the magnetic path distance of leakage flux from one end face of the magnet end position through the rotor core back to the other end face, effectively suppressing leakage flux and thereby increasing the motor's output torque.

[0025] In some technical solutions, optionally, the width of the first sub-magnet slot is less than or equal to the width of the second sub-magnet slot.

[0026] In this technical solution, the dimensions of the first sub-magnet slot and the second sub-magnet slot are defined. Specifically, the width of the first sub-magnet slot is less than or equal to the width of the second sub-magnet slot, and correspondingly, the width of the first magnet installed in the first sub-magnet slot is less than or equal to the width of the second magnet installed in the second sub-magnet slot. This allows for the installation of magnets of different specifications in the first and second magnet slots to improve the magnetic performance of the motor.

[0027] In some technical solutions, optionally, at least two of the first sub-magnet slot, the second sub-magnet slot, and the third magnet slot have the same width, or the widths of the first sub-magnet slot, the second sub-magnet slot, and the third magnet slot are different from each other.

[0028] In this technical solution, the dimensions of the first sub-magnet slot, the second sub-magnet slot, and the third magnet slot are further defined. Specifically, at least two of the first, second, and third magnet slots have the same width, or the widths of the first, second, and third magnet slots are different from each other. In one possible technical solution, the first and second sub-magnet slots have the same width, while the third magnet slot has a different width than the first and second sub-magnet slots; that is, the first and second magnets have the same width, while the third magnet has a different width than the first and second magnets. In yet another possible technical solution, the widths of the first, second, and third magnet slots are different from each other, and the widths of the first, second, and third magnets are also different from each other. Thus, various combinations can be made according to the performance of the motor.

[0029] In some technical solutions, optionally, at least two third magnet slots are arranged symmetrically with respect to the axis.

[0030] In this technical solution, the arrangement of the third magnet slots is defined. Specifically, at least two third magnet slots are symmetrically arranged with respect to the axis. This allows the third magnet slots to be adapted to the first and second magnet slots, ensuring uniform magnetic flux density in the areas where each magnet mounting part is located, and improving the stability of the motor's torque output.

[0031] In some technical solutions, optionally, the number of first magnets that can be installed in the first magnet slot is N1, the number of second magnets that can be installed in the second magnet slot is N2, and the number of third magnets that can be installed in the third magnet slot is N3, where N1, N2, and N3 satisfy N3 < N1, N3 < N2, and N1, N2, and N3 are all positive integers.

[0032] In this technical solution, the number of magnets that can be installed in the first magnet slot, the second magnet slot, and the third magnet slot is limited. Specifically, the number of first magnets that can be installed in the first magnet slot is N1, the number of second magnets that can be installed in the second magnet slot is N2, and the number of third magnets that can be installed in the third magnet slot is N3, where N1, N2, and N3 satisfy N3 < N1 and N3 < N2. That is, the number of magnets that can be installed in the third magnet slot is less than the number of magnets that can be installed in the first magnet slot, and the number of magnets that can be installed in the third magnet slot is less than the number of magnets that can be installed in the second magnet slot. In one possible technical solution, the number of first magnets that can be installed in the first magnet slot is two, the number of second magnets that can be installed in the second magnet slot is two, and the number of third magnets that can be installed in any third magnet slot is one.

[0033] Understandably, since the third magnet slot is located outside the first and second magnet slots, if a large number of magnets can be installed in the third magnet slot, it will result in an excessively long third magnet slot. This prevents the two symmetrical third magnet slots from forming a large angle, leading to a longer magnetic flux path, increased magnetic leakage, weakened motor torque output capability, and increased harmonics, resulting in increased motor torque ripple and noise. To avoid these problems, this application sets the third magnet slot to accommodate fewer magnets, thus allowing for a shorter length. This facilitates a larger angle between the two symmetrical third magnet slots, reducing magnetic leakage, improving motor torque output capability, reducing harmonics, minimizing motor torque ripple, and lowering motor noise.

[0034] In some technical solutions, the rotor core may optionally have multiple recesses, which are sequentially arranged along the circumference of the core body at the edge of the core body.

[0035] In this technical solution, the structure of the rotor core is further defined. Multiple recesses are provided circumferentially along the core body, located at the edges of the core body and recessed towards the center of the core body.

[0036] Specifically, the recesses can form arc-shaped openings with a shallow depth to avoid significantly altering the shape of the circumferential surface of the core body. By setting multiple recesses along the edge of the core body, the shape of the circumferential surface of the rotor core is changed, thereby altering the air gap between the rotor and stator. The magnetic permeability waveform of the air gap in the motor is related to its width. By setting recesses, the width of the air gap can be locally increased, thus optimizing the magnetic permeability waveform and suppressing harmonic components in the air gap's magnetic permeability waveform. Furthermore, the rotor's magnetic field strength is equal to the product of the magnetomotive force and the magnetic permeability. Based on the optimized waveform of the synthesized magnetomotive force, combined with the optimization of the air gap's magnetic permeability waveform, it is possible to further suppress harmonic components of the air gap's magnetic field strength and improve the sinusoidal nature of the air gap's magnetic field strength waveform.

[0037] In some technical solutions, optionally, the magnet mounting portion corresponds to multiple recesses, and the multiple recesses corresponding to the magnet mounting portion are symmetrically arranged with respect to the axis of the corresponding magnet mounting portion.

[0038] In this technical solution, the arrangement of multiple recesses is defined. Specifically, the magnet mounting portion corresponds to multiple recesses, and these recesses are symmetrically arranged with respect to the axis of the corresponding magnet mounting portion. This allows multiple air gaps to be formed on the outer side of the magnet mounting portion, and the symmetry of these air gaps with respect to the axis of the magnet mounting portion enhances the optimization effect on the waveform of the magnetic field strength in the air gaps.

[0039] In some technical solutions, optionally, multiple magnet mounting parts are evenly distributed along the circumference of the iron core body.

[0040] In this technical solution, the arrangement of the magnet mounting sections is defined. Specifically, multiple magnet mounting sections are evenly distributed along the circumference of the iron core body. Multiple magnets are installed in each magnet mounting section to form magnetic poles. This allows for a relatively uniform magnetic flux density throughout the rotor's periphery, improving motor performance.

[0041] A second aspect of the invention also provides an electric motor comprising the rotor proposed in the first aspect of the invention.

[0042] The motor provided by the second aspect of the present invention, having the rotor proposed in the first aspect of the present invention, has all the beneficial effects of the rotor.

[0043] In some technical solutions, the motor may optionally include: a stator, including rotor slots, a rotor rotatably mounted in the rotor slots, the rotor being able to rotate relative to the stator; and a plurality of windings mounted circumferentially on the inner periphery of the stator.

[0044] In this technical solution, the structure of the motor is further defined. The motor also includes a stator and multiple windings. The stator includes rotor slots, and the rotor is rotatably mounted in the rotor slots and can rotate relative to the stator. The windings are mounted on the stator, and multiple windings are sequentially mounted on the inner circumference of the stator along the circumference of the stator.

[0045] Specifically, the output torque of the motor is the combined torque of reluctance torque and magnet torque. Reluctance torque is the torque generated by the attraction between the poles formed by the rotating magnetic field of the stator and the salient poles of the rotor. This reluctance torque is located within the rotor core and crosses the center line of the magnetic poles; the more main magnetic flux flowing approximately circumferentially through the rotor core, the higher the reluctance torque. Magnet torque is the torque generated by the attraction and repulsion between the poles of the rotating magnetic field of the stator and the magnetic poles of the rotor. Magnet torque is located within the rotor core; the more magnetic flux flowing simultaneously through the third, first, and second magnets, the higher the magnet torque. Multiple third magnets installed in the third magnet slot, multiple first magnets installed in the first magnet slot, and multiple second magnets installed in the second magnet slot form a three-layer magnetic pole structure, which increases the total amount of magnetic flux by increasing the total number of first, second, and third magnets. Furthermore, both the first and second magnet slots employ a radially layered structure. Specifically, the first magnet slot includes at least two interconnected first sub-magnet slots, and the second magnet slot includes at least two interconnected second sub-magnet slots. First and second magnets are respectively installed within the first and second sub-magnet slots. Compared to existing V-shaped, double-V-shaped, and V+1-shaped magnetic circuit structures, this design effectively increases reluctance torque and improves motor output capacity while meeting motor cost requirements. It also shifts the motor's inflection point backward, thereby enhancing motor power and efficiency.

[0046] A third aspect of the invention also provides a vehicle comprising the rotor proposed in the first aspect of the invention, or the motor proposed in the second aspect of the invention.

[0047] The vehicle provided by the third aspect of the present invention, having the rotor proposed by the first aspect of the present invention or the motor proposed by the second aspect of the present invention, has all the beneficial effects of the rotor or the motor.

[0048] Additional aspects and advantages of the invention will become apparent in the following description or may be learned by practice of the invention. Attached Figure Description

[0049] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0050] Figure 1 A schematic diagram of the rotor core according to an embodiment of the present invention is shown;

[0051] Figure 2 One of the schematic diagrams showing a partial structure of a rotor core according to an embodiment of the present invention is illustrated;

[0052] Figure 3 A second partial structural schematic diagram of the rotor core according to an embodiment of the present invention is shown;

[0053] Figure 4 A third schematic diagram of a partial structure of the rotor core according to an embodiment of the present invention is shown;

[0054] Figure 5 A schematic diagram of the structure of a motor according to an embodiment of the present invention is shown.

[0055] in, Figures 1 to 5 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0056] 100 Rotor core, 110 Core body, 111 Recess, 112 First recess, 113 Second recess, 114 Third recess, 115 Fourth recess, 116 Shaft, 120 Magnet mounting part, 130 First magnet slot group, 131 First magnet slot, 132 First sub-magnet slot, 133 First connecting part, 134 Slot wall of the first sub-magnet slot, 140 Second magnet slot group, 141 Second magnet slot, 142 Second sub-magnet slot, 143 Second connecting part, 144 Slot wall of the second sub-magnet slot, 150 Third magnet slot group, 151 Third magnet slot, 152 Slot wall of the third magnet slot, 200 Rotor, 210 Magnet, 211 First magnet, 212 Second magnet, 213 Third magnet, 300 Motor, 310 Stator, 311 Rotor slot, 320 Winding. Detailed Implementation

[0057] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0058] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0059] The following reference Figures 1 to 5 The rotor 200, motor 300, and vehicle are described according to some embodiments of the present invention.

[0060] In one embodiment according to this application, such as Figure 1 , Figure 2 and Figure 3As shown, this application proposes a rotor 200, including: a rotor core 100; and a plurality of magnets 210 mounted on the rotor core 100, wherein the plurality of magnets 210 include a plurality of first magnets 211, a plurality of second magnets 212, and a plurality of third magnets 213; wherein the rotor core 100 includes: a core body 110, the core body 110 having a plurality of magnet mounting portions 120 arranged sequentially along the circumference of the core body 110, and the magnet mounting portions 120 being used to mount the magnets 210. The magnet mounting section 120 includes: a first magnet slot group for mounting a first magnet 211, the first magnet slot group including at least two first magnet slots 131, the at least two first magnet slots 131 being symmetrically arranged with respect to the axis 116 of the iron core body 110, each first magnet slot 131 including at least two first sub-magnet slots 132, the at least two first sub-magnet slots 132 being sequentially arranged along a direction away from the axis 116, the slot walls 134 of the two first sub-magnet slots being close to the axis 116 and symmetrical with respect to the axis 116. The included angle between them is α1; the second magnet slot group 140 is used to install the second magnet 212. The second magnet slot group 140 includes at least two second magnet slots 141. The at least two second magnet slots 141 are symmetrically arranged with respect to the axis 116 of the iron core body 110. Along the radial direction of the iron core body 110, the second magnet slots 141 are located on the side of the first magnet slot 131 facing the center of the iron core body 110. The second magnet slots 141 include at least two second sub-magnet slots 142. The at least two second sub-magnet slots 142 are arranged along the radial direction of the iron core body 110. The two second sub-magnet slots, which are arranged sequentially in the direction away from the axis 116 and are close to the axis 116 and symmetrical with respect to the axis 116, have an included angle α2 between their slot walls 144. The third magnet slot group 150 is used to install the third magnet 213. The third magnet slot group 150 includes at least two third magnet slots 151, which are located on both sides of the axis. Along the radial direction of the iron core body 110, the third magnet slot 151 is located on the side of the first magnet slot 131 away from the center of the iron core body 110. The included angle between the walls 152 of the two third magnet slots located on both sides of the axis is α3; where α1, α2 and α3 satisfy α3>α1>α2; the included angle between the wall 134 of the first sub-magnet slot away from the axis 116 and the axis 116 is θ1, where α1 and θ1 satisfy α1 / 4≤θ1<α1 / 2; the included angle between the wall 144 of the second sub-magnet slot away from the axis 116 and the axis 116 is θ2, where α2 and θ2 satisfy α2 / 4≤θ2<α2 / 2.

[0061] The rotor 200 proposed in this application includes a rotor core 100 and multiple magnets 210, with the magnets 210 mounted on the rotor core 100. The magnets 210 can be a combination of high-remanence rare-earth permanent magnet materials and low-coercivity ferrite materials. Specifically, for applications with harsh conditions and high requirements for magnet demagnetization, all magnets can be made of high-remanence rare-earth permanent magnet materials. For applications with lower demagnetization requirements but stringent cost constraints, some magnets 210 can be made of high-remanence rare-earth permanent magnet materials, while others can be made of low-coercivity ferrite materials, thus reducing the cost of the motor 300 while mitigating the risk of demagnetization.

[0062] Furthermore, the rotor core 100 includes a core body 110, on which a plurality of magnet mounting portions 120 are provided for mounting magnets 210. Specifically, the plurality of magnet mounting portions 120 are arranged sequentially along the circumference of the core body 110, with the magnet mounting portions 120 close to the outer periphery of the core body 110, and a distance between any two adjacent magnet mounting portions 120. When a magnet 210 is mounted in a magnet mounting portion 120, the plurality of magnets 210 mounted in the same magnet mounting portion 120 together form a magnetic pole.

[0063] Furthermore, the plurality of magnets 210 includes a plurality of first magnets 211, a plurality of second magnets 212, and a plurality of third magnets 213. The magnet mounting portion 120 includes a first magnet slot group 130, a second magnet slot group 140, and a third magnet slot group 150, which are respectively used to mount the first magnets 211, the second magnets 212, and the third magnets 213. The third magnet slot group 150, the first magnet slot group 130, and the second magnet slot group 140 are arranged sequentially along the radial direction of the core body 110. Along the radial direction of the core body 110, the second magnet slot group 140 is located on the side of the first magnet slot group 130 facing the center of the rotor core 100, and the third magnet slot group 150 is located on the side of the first magnet slot group 130 away from the center of the rotor core 100. By setting a first magnet slot group 130, a second magnet slot group 140, and a third magnet slot group 150 in the magnet mounting part 120, the first magnet slot group 130, the second magnet slot group 140, and the third magnet slot group 150 form a three-layer structure, thereby increasing the saliency ratio of the motor 300, increasing the reluctance torque ratio, reducing the amount of magnet 210 used, effectively increasing the power density of the motor 300, and reducing the cost of the motor 300.

[0064] Furthermore, the first magnet slot group 130 includes at least two first magnet slots 131, which are symmetrically arranged with respect to the axis 116 of the iron core body 110. The first magnet slots 131 are used to mount first magnets 211, and multiple first magnets 211 are symmetrically mounted in the first magnet slots 131 on both sides of the axis 116. In one possible embodiment, the first magnet slots 131 on both sides of the axis 116 are arranged in a V-shape. Each first magnet slot 131 includes at least two first sub-magnet slots 132, each capable of mounting at least one first magnet 211. This increases the number of first magnets 211 in the first magnet slots 131, further improving the power density of the motor 300, providing direct-axis permanent magnet flux to the motor 300, increasing the torque density of the motor 300, and improving the permanent magnet torque of the motor 300.

[0065] Furthermore, the second magnet slot group 140 includes at least two second magnet slots 141, which are symmetrically arranged with respect to the axis 116 of the iron core body 110. The second magnet slots 141 are used to mount second magnets 212, and multiple second magnets 212 are symmetrically mounted in the second magnet slots 141 on both sides of the axis 116. In one possible embodiment, the second magnet slots 141 on both sides of the axis 116 are arranged in a V-shape. Each second magnet slot 141 includes at least two second sub-magnet slots 142, each capable of mounting at least one second magnet 212. This increases the number of second magnets 212 in the second magnet slots 141, further improving the power density of the motor 300, providing direct-axis permanent magnet flux to the motor 300, increasing the torque density of the motor 300, and improving the permanent magnet torque of the motor 300. Along the radial direction of the iron core body 110, the second magnet slot 141 is located on the side of the first magnet slot 131 facing the center of the iron core body 110, that is, the second magnet slot 141 is located on the side of the first magnet slot 131 facing the center of the iron core body 110.

[0066] Furthermore, the third magnet slot group 150 includes at least two third magnet slots 151, which are symmetrically arranged with respect to the axis 116 of the core body 110. A plurality of third magnets 213 are symmetrically installed in the third magnet slots 151 on both sides of the axis 116 of the core body 110. The third magnet slots 151 are located on the side of the first magnet slot 131 away from the center of the core body 110. The second magnet slot 141, the first magnet slot 131, and the third magnet slot 151 are arranged radially in a direction away from the center of the core body 110. In one possible embodiment, the third magnet slots 151 on both sides of the axis 116 are arranged in a V-shape. In this way, the first magnet slot 131, the second magnet slot 141 and the third magnet slot 151 can form a three-layer structure, thereby further increasing the saliency ratio of the motor 300, increasing the reluctance torque ratio, reducing the amount of magnet 210 used, effectively increasing the power density of the motor 300, and reducing the cost of the motor 300.

[0067] In one possible embodiment, the first magnet slot 131 includes two first sub-magnet slots 132, in which two first magnets 211 can be installed; the second magnet slot 141 includes two second sub-magnet slots 142, in which two second magnets 212 can be installed; and the third magnet slot 151 can only install one third magnet 213.

[0068] Furthermore, a portion of the main magnetic flux flowing from the teeth of the stator 310 in the motor 300 into the rotor 200 flows approximately circumferentially along the magnetic path formed between the first magnet slot 131 and the third magnet slot 151, and between the first magnet slot 131 and the second magnet slot 141. On the other hand, the magnetic flux of the magnet 210 flows along a path connecting the third magnet 213, the first magnet 211, and the second magnet 212, in a direction approximately radial to the rotor core 100. This magnetic flux of the magnet 210 flows not only approximately radially, but also a portion of it flows approximately circumferentially. For example, the magnetic flux of the magnet 210 output from the first magnet 211 (or the second magnet 212) located to the right of the magnetic pole centerline advances approximately circumferentially not only toward the first magnet 211 (or the second magnet 212) in the first sub-magnet slot 132 (or the second sub-magnet slot 142) also located to the right of the magnetic pole centerline, but also toward the first magnet 211 located to the left of the magnetic pole centerline. Thus, the magnetic flux flowing circumferentially through the magnet 210 increases as it approaches the center of the magnetic pole. As a result, near the center of the magnetic pole, both the main magnetic flux and the magnetic flux of the magnet 210 run parallel circumferentially, making it easy for the magnetic flux density to increase. When the magnetic flux density increases excessively and saturates, the reluctance torque and the magnet torque decrease, and the output torque of the permanent magnet motor 300 decreases. To avoid such magnetic saturation, both the first magnet slot 131 and the second magnet slot 141 adopt a radially layered structure; that is, the first magnet slot 131 includes at least two first sub-magnet slots 132, and the second magnet slot 141 includes at least two second sub-magnet slots 142, increasing the width of the magnetic circuit as it approaches the center of the magnetic pole where the magnetic flux tends to concentrate.

[0069] Furthermore, at least two first sub-magnet slots 132 are sequentially arranged in a direction away from the axis 116. The angle between the slot walls 134 of the two first sub-magnet slots that are close to the axis 116 and symmetrical with respect to the axis 116 is α1, and the angle between the slot wall 134 of the first sub-magnet slot that is far from the axis 116 and the axis 116 is θ1. α1 and θ1 satisfy α1 / 4 ≤ θ1 < α1 / 2. At least two second sub-magnet slots 142 are sequentially arranged in a direction away from the axis 116. The angle between the slot walls 144 of the two second sub-magnet slots that are close to the axis 116 and symmetrical with respect to the axis 116 is α2, and the angle between the slot wall 144 of the second sub-magnet slot that is far from the axis 116 and the axis 116 is θ2. α2 and θ2 satisfy α2 / 4 ≤ θ2 < α2 / 2. By setting θ1 to be greater than or equal to α1 / 4 and θ2 to be greater than or equal to α2 / 4, the magnetic circuit width near the magnetic pole center where the main magnetic flux and the magnetic flux of magnet 210 are easily parallel can be expanded, which can effectively prevent magnetic saturation and further improve the output torque of motor 300.

[0070] Furthermore, if the first magnet slot 131 and the second magnet slot 141 are made straight, i.e., θ1 = α1 / 2 and θ2 = α2 / 2, the magnetic path width near the center of the magnetic poles becomes excessively large. This makes it difficult for the magnetic flux output from one first magnet 211 and the second magnet 212 to pass to the other, thus forming leakage flux. In order to reduce such leakage flux and increase the effective magnetic flux of the magnet 210, this application makes the first magnet slot 131 and the second magnet slot 141 curved, i.e., θ1 < α1 / 2 and θ2 < α2 / 2. By setting the structure as described above, it is possible to maintain a suitable distance between the two first magnets 211 and the two second magnets 212 while avoiding magnetic saturation, reducing leakage flux, further increasing the reluctance torque ratio, increasing the power density of the motor 300, and correspondingly reducing the amount of magnets 210 used, thereby reducing the production cost of the motor 300.

[0071] like Figure 2 As shown, further, the included angle between the groove walls 152 of the two third magnet grooves located on both sides of axis 116 is α3, and α1, α2 and α3 satisfy α3>α1>α2.

[0072] Understandably, α1, α2, and α3 are the pole angles of each magnet slot. The size of the pole angles directly affects the direction of the magnetic field lines. In a multi-pole magnetic circuit, if the angles between the multiple third magnets 213 near the stator 310 are too small, the magnetic field line path will become longer, increasing leakage flux and weakening the torque output capability of the motor 300. At the same time, harmonics will also increase, leading to increased torque pulsation and noise in the motor 300. To solve the above problems, this application performs the above numerical matching on the pole angles. Along the radial direction of the rotor core 100 from the inside to the outside (i.e., away from the center of the rotor core 100), the pole angles gradually increase, i.e., α3 > α1 > α2. This can effectively reduce the magnetic field line path, weaken the leakage flux phenomenon, ensure the torque output capability of the motor 300, reduce harmonics, eliminate torque pulsation as much as possible, and reduce motor noise.

[0073] Furthermore, in the rotor 200 structure, the combined magnetomotive force of one magnetic pole is generated by the combined action of the first magnet 211, the second magnet 212, and the third magnet 213. The waveform of the combined magnetomotive force includes both the fundamental wave and harmonics. By simultaneously matching θ1 and α1, and θ2 and α2 as described above, the waveform of the combined magnetomotive force can be optimized, effectively suppressing the harmonic components in the waveform of the combined magnetomotive force, improving the sinusoidal nature of the air gap magnetic field waveform, thereby reducing the cogging torque and torque ripple of the motor 300, reducing the vibration and noise of the motor 300, and more flexibly optimizing the waveform of the combined magnetomotive force to meet product requirements.

[0074] In some embodiments, optionally, such as Figure 1 As shown, the first magnet slot 131 further includes a first connecting portion 133, which is used to connect two adjacent first sub-magnet slots 132; the second magnet slot 141 further includes a second connecting portion 143, which is used to connect two adjacent second sub-magnet slots 142.

[0075] In this embodiment, the structures of the first magnet slot 131 and the second magnet slot 141 are further defined. The first magnet slot 131 further includes a first connecting portion 133, which is used to connect two adjacent first sub-magnet slots 132. Specifically, a first connecting portion 133 is provided between any two adjacent first sub-magnet slots 132, and the two ends of the first connecting portion 133 are respectively connected to the two first magnet slots 131, so that the two adjacent first magnet slots 131 are not separated to form a magnetic bridge structure. The second magnet slot 141 further includes a second connecting portion 143, which is used to connect two adjacent second sub-magnet slots 142. Specifically, a second connecting portion 143 is provided between any two adjacent second sub-magnet slots 142, and the two ends of the second connecting portion 143 are respectively connected to the two second magnet slots 141, so that the two adjacent first magnet slots 131 are not separated to form a magnetic bridge structure.

[0076] By providing a first connecting portion 133 and a second connecting portion 143 in the first magnet slot 131 and the second magnet slot 141, adjacent first sub-magnet slots 132 can be connected through the first connecting portion 133, and adjacent second sub-magnet slots 142 can be connected through the second connecting portion 143. This prevents the formation of magnetic bridge structures in the first magnet slots 131 and the second magnet slots 141, making the magnetic circuit structure of the motor 300 more flexible and adjustable, and effectively reducing eddy current losses in the magnets 210 within the magnet slots, thus improving the efficiency of the motor 300. Furthermore, the first connecting portion 133 ensures continuous and stable magnetic flux within the first magnet slot 131, and the second connecting portion 143 ensures continuous and stable magnetic flux within the second magnet slot 141. This lengthens the magnetic path distance of leakage flux from one end face of the magnet 210 through the rotor core 100 back to the other end face, effectively suppressing leakage flux and thereby increasing the output torque of the motor 300.

[0077] In some embodiments, the width of the first sub-magnet slot 132 may be less than or equal to the width of the second sub-magnet slot 142.

[0078] In this embodiment, the dimensions of the first sub-magnet slot 132 and the second sub-magnet slot 142 are defined. Specifically, the width of the first sub-magnet slot 132 is less than or equal to the width of the second sub-magnet slot 142. Correspondingly, the width of the first magnet 211 installed in the first sub-magnet slot 132 is less than or equal to the width of the second magnet 212 installed in the second sub-magnet slot 142. In this way, magnets 210 of different specifications can be installed in the first magnet slot 131 and the second magnet slot 141 to improve the magnetic performance of the motor 300.

[0079] In some embodiments, optionally, at least two of the first sub-magnet slot 132, the second sub-magnet slot 142, and the third magnet slot 151 have the same width, or the widths of the first sub-magnet slot 132, the second sub-magnet slot 142, and the third magnet slot 151 are different from each other.

[0080] In this embodiment, the dimensions of the first sub-magnet slot 132, the second sub-magnet slot 142, and the third magnet slot 151 are further defined. Specifically, at least two of the first sub-magnet slot 132, the second sub-magnet slot 142, and the third magnet slot 151 have the same width, or the widths of the first sub-magnet slot 132, the second sub-magnet slot 142, and the third magnet slot 151 are different from each other. In one possible embodiment, the first sub-magnet slot 132 and the second sub-magnet slot 142 have the same width, and the third magnet slot 151 has a different width than the first sub-magnet slot 132 and the second sub-magnet slot 142, that is, the first magnet 211 and the second magnet 212 have the same width, and the third magnet 213 has a different width than the first magnet 211 and the second magnet. In another possible embodiment, the widths of the first sub-magnet slot 132, the second sub-magnet slot 142, and the third magnet slot 151 are different from each other, and the widths of the first magnet 211, the second magnet 212, and the third magnet 213 are different from each other. Thus, various combinations can be made according to the performance of the motor 300.

[0081] In some embodiments, at least two third magnet slots 151 are optionally arranged symmetrically with respect to axis 116.

[0082] In this embodiment, the arrangement of the third magnet slot 151 is defined. Specifically, at least two third magnet slots 151 are symmetrically arranged with respect to the axis 116. In this way, the third magnet slots 151 can be adapted to the first magnet slot 131 and the second magnet slot 141, so that the magnetic flux density in the area where each magnet mounting part 120 is located remains uniform, thereby improving the torque output stability of the motor 300.

[0083] In some embodiments, optionally, the number of first magnets 211 that can be installed in the first magnet slot 131 is N1, the number of second magnets 212 that can be installed in the second magnet slot 141 is N2, and the number of third magnets 213 that can be installed in the third magnet slot 151 is N3, where N1, N2, and N3 satisfy N3 < N1, N3 < N2, and N1, N2, and N3 are all positive integers.

[0084] In this embodiment, the number of magnets 210 that can be installed in the first magnet slot 131, the second magnet slot 141, and the third magnet slot 151 is limited. Specifically, the number of first magnets 211 that can be installed in the first magnet slot 131 is N1, the number of second magnets 212 that can be installed in the second magnet slot 141 is N2, and the number of third magnets 213 that can be installed in the third magnet slot 151 is N3, where N1, N2, and N3 satisfy N3 < N1 and N3 < N2. That is, the number of magnets 210 that can be installed in the third magnet slot 151 is less than the number of magnets 210 that can be installed in the first magnet slot 131, and the number of magnets 210 that can be installed in the third magnet slot 151 is less than the number of magnets 210 that can be installed in the second magnet slot 141. In one possible embodiment, the number of first magnets 211 that can be installed in the first magnet slot 131 is two, the number of second magnets 212 that can be installed in the second magnet slot 141 is two, and the number of third magnets 213 that can be installed in the third magnet slot 151 is one.

[0085] Understandably, since the third magnet slot 151 is located outside the first magnet slot 131 and the second magnet slot 141, if a large number of magnets 210 can be installed in the third magnet slot 151, the third magnet slot 151 will become too long. This will prevent the two symmetrical third magnet slots 151 from forming a large angle, resulting in a longer magnetic field path, increased magnetic leakage, weakened torque output capability of the motor 300, and increased harmonics, leading to increased torque pulsation and noise of the motor 300. To avoid the above problems, this application sets the third magnet slot 151 to accommodate fewer magnets 210, thereby allowing the third magnet slot 151 to have a shorter length. This facilitates the formation of a larger angle between the two symmetrical third magnet slots 151, reduces magnetic leakage, improves the torque output capability of the motor 300, reduces harmonics, decreases torque pulsation, and lowers motor noise.

[0086] In some embodiments, optionally, such as Figure 1 and Figure 4 As shown, the rotor core 100 has a plurality of recesses 111, which are arranged sequentially along the circumference of the core body 110 on the edge of the core body 110.

[0087] In this embodiment, the structure of the rotor core 100 is further defined. Along the circumferential direction of the core body 110, a plurality of recesses 111 are provided in the circumferential direction of the core body 110. The recesses 111 are located at the edge of the core body 110 and are recessed in the direction toward the center of the core body 110.

[0088] Specifically, the recess 111 can form an arc-shaped opening, and the recess 111 has a small depth to avoid significantly altering the shape of the circumferential surface of the core body 110. By providing multiple recesses 111 along the edge of the core body 110, the shape of the circumferential surface of the rotor core 100 is changed, thereby altering the air gap between the rotor 200 and the stator 310. The magnetic permeation waveform of the air gap in the motor 300 is related to the width of the air gap. By providing the recesses 111, the width of the air gap can be locally increased, thereby optimizing the magnetic permeation waveform of the air gap and suppressing harmonic components in the magnetic permeation waveform of the air gap. In addition, the magnetic field strength of the rotor 200 is equal to the product of the magnetomotive force and the magnetic permeation. Based on the above-mentioned optimized composite magnetomotive force waveform, combined with the optimization of the magnetic permeation waveform of the air gap, it is possible to further suppress the harmonic components of the magnetic field strength of the air gap and improve the sinusoidal nature of the magnetic field strength waveform of the air gap.

[0089] In some embodiments, the magnet mounting portion 120 may optionally correspond to a plurality of recesses 111, and the plurality of recesses 111 corresponding to the magnet mounting portion 120 are symmetrically arranged with respect to the axis 116 of the respective magnet mounting portion 120.

[0090] In this embodiment, the arrangement of the plurality of recesses 111 is defined. Specifically, the magnet mounting portion 120 corresponds to the plurality of recesses 111, and the plurality of recesses 111 corresponding to the magnet mounting portion 120 are symmetrically arranged with respect to the axis 116 of the corresponding magnet mounting portion 120. In this way, a plurality of air gaps can be formed on the outer side of the magnet mounting portion 120, and the plurality of air gaps are symmetrical with respect to the axis 116 of the magnet mounting portion 120, thereby improving the optimization effect of the waveform of the magnetic field strength of the air gaps.

[0091] like Figure 4 As shown, in one possible embodiment, a first recess 112, a second recess 113, a third recess 114 and a fourth recess 115 are provided near each magnet mounting portion 120, and the first recess 112, the second recess 113, the third recess 114 and the fourth recess 115 are distributed at intervals on the outer circumferential surface of the iron core body 110.

[0092] In some embodiments, optionally, a plurality of magnet mounting portions 120 are evenly distributed along the circumference of the core body 110.

[0093] In this embodiment, the arrangement of the magnet mounting portions 120 is defined. Specifically, multiple magnet mounting portions 120 are evenly distributed along the circumference of the iron core body 110. Multiple magnets 210 are mounted in the magnet mounting portions 120 to form magnetic poles. In this way, the magnetic flux density at various points around the rotor 200 can be relatively balanced, improving the performance of the motor 300.

[0094] A second aspect of the invention also provides a motor 300, such as Figure 5 As shown, it includes the rotor 200 proposed in the first aspect of the present invention.

[0095] The motor 300 provided in the second aspect of the present invention, having the rotor 200 proposed in the first aspect of the present invention, has all the beneficial effects of the rotor 200.

[0096] In some embodiments, optionally, such as Figure 5 As shown, the motor 300 also includes: a stator 310, including a rotor slot 311, a rotor 200 rotatably mounted in the rotor slot 311, and the rotor 200 being able to rotate relative to the stator 310; and a plurality of windings 320, which are mounted on the inner circumferential side of the stator 310 along the circumference of the stator 310.

[0097] In this embodiment, the structure of the motor 300 is further defined. The motor 300 also includes a stator 310 and a plurality of windings 320. The stator 310 includes a rotor slot 311, and the rotor 200 is rotatably mounted in the rotor slot 311 and is capable of rotating relative to the stator 310. The windings 320 are mounted on the stator 310, and along the circumference of the stator 310, the plurality of windings 320 are sequentially mounted on the inner circumferential side of the stator 310.

[0098] Specifically, the output torque of the motor 300 is a combined torque of reluctance torque and magnet torque. The reluctance torque is generated by the attraction between the poles formed by the rotating magnetic field of the stator 310 and the salient poles of the rotor 200. This reluctance torque is generated within the rotor core 100 and crosses the center line of the magnetic poles; the more main magnetic flux flowing approximately circumferentially through the rotor core 100, the higher the reluctance torque. The magnet torque is generated by the attraction and repulsion between the poles of the rotating magnetic field of the stator 310 and the magnetic poles of the rotor 200. Within the rotor core 100, the magnet torque is increased by the more magnetic flux flowing through the magnets 210 simultaneously via the third magnet 213, the first magnet 211, and the second magnet 212. A plurality of third magnets 213 installed in the third magnet slot 151, a plurality of first magnets 211 installed in the first magnet slot 131, and a plurality of second magnets 212 installed in the second magnet slot 141 form a three-layer magnetic pole structure, which can increase the total amount of magnetic flux of the magnet 210 by increasing the total number of first magnets 211, second magnets 212, and third magnets 213. In addition, both the first magnet slot 131 and the second magnet slot 141 adopt a radially layered structure, that is, the first magnet slot 131 includes at least two interconnected first sub-magnet slots 132, and the second magnet slot 141 includes at least two interconnected second sub-magnet slots 142, and the first magnets 211 and the second magnets 212 are respectively installed in the first sub-magnet slots 132 and the second sub-magnet slots 142. Compared with existing magnetic circuit structures such as V-shaped, double V-shaped, and V+1-shaped, this technology can effectively increase the magnetic reluctance torque and improve the output capacity of the motor 300 while meeting the cost requirements of the motor 300. This allows the inflection point of the motor 300 to be shifted backward, thereby improving the power and efficiency of the motor 300.

[0099] A third aspect of the invention also provides a vehicle comprising the rotor 200 of the first aspect of the invention, or the motor 300 of the second aspect of the invention.

[0100] The vehicle provided by the third aspect of the present invention, having the rotor 200 proposed by the first aspect of the present invention or the motor 300 proposed by the second aspect of the present invention, has all the beneficial effects of the rotor 200 or the motor 300.

[0101] In one possible embodiment, Figure 1 This is a schematic diagram of the rotor core 100 in this embodiment. Figure 2 for Figure 1 A magnified view of the magnetic pole region of the rotor core 100 shown. (Combined with...) Figure 1 and Figure 2 The rotor core 100 of this embodiment includes an outer peripheral surface and an inner peripheral surface. A plurality of magnetic poles (i.e., a magnet mounting part 120 and a plurality of magnets 210 installed in the magnet mounting part 120) are provided between the outer peripheral surface and the inner peripheral surface. The plurality of magnetic poles can be arranged at intervals along the circumference of the rotor core 100.

[0102] Figure 3 for Figure 1 The schematic diagram of the magnetic pole region arrangement of the rotor core 100 shown is combined with... Figure 1 and Figure 2 Each magnetic pole region includes: a first magnetic group (i.e., multiple third magnets 213 installed in the third magnet slot group 150), a second magnetic group (i.e., multiple first magnets 211 installed in the first magnet slot group 130), and a third magnetic group (i.e., multiple second magnets 212 installed in the second magnet slot group 140). The multiple magnetic groups are arranged at intervals in the radial direction away from the center of the rotor 200. In this embodiment, the first magnetic group is located on the outermost radial side of the rotor core 100, the second magnetic group is located on the inner radial side of the first magnetic group, and the third reluctance is located on the inner radial side of the second magnetic group. Therefore, the first magnetic group, the second magnetic group, and the third magnetic group form a three-layer structure, which increases the saliency ratio of the motor 300, increases the reluctance torque ratio, reduces the amount of magnets 210 used, effectively improves the power density of the motor 300, and reduces the cost of the motor 300.

[0103] In this invention, the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0104] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0105] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A rotor, characterized in that, include: Rotor core; Multiple magnets are installed on the rotor core, and the multiple magnets include multiple first magnets, multiple second magnets and multiple third magnets; The rotor core includes: The iron core body has multiple magnet mounting portions arranged sequentially along the circumference of the iron core body. Each magnet mounting portion is used to mount a magnet and includes: A first magnet slot group is used to install the first magnet. The first magnet slot group includes at least two first magnet slots. The at least two first magnet slots are symmetrically arranged with respect to the axis of the iron core body. The first magnet slot includes at least two first sub-magnet slots. The at least two first sub-magnet slots are arranged sequentially in a direction away from the axis. The included angle between the slot walls of the two first sub-magnet slots that are close to the axis and symmetrical with respect to the axis is α1. A second magnet slot group is used to install the second magnet. The second magnet slot group includes at least two second magnet slots, which are symmetrically arranged with respect to the axis of the iron core body. Along the radial direction of the iron core body, the second magnet slot is located on the side of the first magnet slot facing the center of the iron core body. The second magnet slot includes at least two second sub-magnet slots, which are arranged sequentially in a direction away from the axis. The included angle between the slot walls of the two second sub-magnet slots that are close to the axis and symmetrical with respect to the axis is α2. The third magnet slot group is used to install the third magnet. The third magnet slot group includes at least two third magnet slots, which are respectively located on both sides of the axis. Along the radial direction of the iron core body, the third magnet slot is located on the side of the first magnet slot away from the center of the iron core body. The included angle between the slot walls of the two third magnet slots located on both sides of the axis is α3. Among them, α1, α2 and α3 satisfy α3>α1>α2; The angle between the wall of the first sub-magnet slot, which is furthest from the axis, and the axis is θ1. α1 and θ1 satisfy α1 / 4≤θ1<α1 / 2; The angle between the wall of the second sub-magnet slot, which is away from the axis, and the axis is θ2, and α2 and θ2 satisfy α2 / 4≤θ2<α2 / 2.

2. The rotor according to claim 1, characterized in that, The first magnet slot further includes a first connecting portion, which is used to connect two adjacent first sub-magnet slots; The second magnet slot also includes a second connecting portion, which is used to connect two adjacent second sub-magnet slots.

3. The rotor according to claim 1, characterized in that, The width of the first sub-magnet slot is less than or equal to the width of the second sub-magnet slot.

4. The rotor according to claim 1, characterized in that, The width of at least two of the first sub-magnet slot, the second sub-magnet slot, and the third magnet slot is the same, or the widths of the first sub-magnet slot, the second sub-magnet slot, and the third magnet slot are different from each other.

5. The rotor according to claim 1, characterized in that, At least two of the third magnet slots are arranged symmetrically with respect to the axis.

6. The rotor according to claim 1, characterized in that, The number of first magnets that can be installed in the first magnet slot is N1, the number of second magnets that can be installed in the second magnet slot is N2, and the number of third magnets that can be installed in the third magnet slot is N3. N1, N2, and N3 satisfy N3 < N1, N3 < N2, and N1, N2, and N3 are all positive integers.

7. The rotor according to any one of claims 1 to 6, characterized in that, The rotor core has multiple recesses, which are sequentially arranged along the circumference of the core body at the edge of the core body.

8. The rotor according to claim 7, characterized in that, The magnet mounting portion corresponds to a plurality of recesses, and the plurality of recesses corresponding to the magnet mounting portion are arranged symmetrically with respect to the axis of the corresponding magnet mounting portion.

9. The rotor according to any one of claims 1 to 6, characterized in that, Multiple magnet mounting portions are evenly distributed along the circumference of the iron core body.

10. An electric motor, characterized in that, include: The rotor as described in any one of claims 1 to 9.

11. The motor according to claim 10, characterized in that, Also includes: A stator, including rotor slots, wherein the rotor is rotatably mounted in the rotor slots and is rotatable relative to the stator; Multiple windings are mounted on the inner circumference side of the stator along the circumference of the stator.

12. A vehicle, characterized in that, include: The rotor as described in any one of claims 1 to 9; or The motor as described in claim 10 or 11.

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