CN215911958U

CN215911958U - Motor rotor, driving motor and electric automobile

Info

Publication number: CN215911958U
Application number: CN202121088990.0U
Authority: CN
Inventors: 额尔和木巴亚尔; 沈飞; 谢小威
Original assignee: Huawei Digital Power Technologies Co Ltd
Current assignee: Huawei Electric Technology Co ltd
Priority date: 2021-05-20
Filing date: 2021-05-20
Publication date: 2022-02-25
Anticipated expiration: 2031-05-20

Abstract

The application provides a motor rotor, driving motor and electric automobile relates to motor technical field. Wherein, the rotor part in the driving motor comprises a rotating shaft and a plurality of rotor cores of two types, the rotating shaft is provided with a fixed component, the central through hole of each rotor core is provided with a fixed component, an included angle is formed between the radial symmetrical axis of the fixed component on each rotor core and the adjacent D axis of the fixed component, and the radial symmetry axis of the fixing component of one type of rotor core is positioned at one side of the fixing component adjacent to the D axis, the radial symmetry axis of the fixing component of the other type of rotor core is positioned at the other side of the fixing component adjacent to the D axis, when two types of rotor iron cores are alternatively nested on the rotating shaft, an included angle exists between the D shafts of two adjacent rotor iron cores, the included angle between the D shafts of two alternative rotor iron cores is 0, by reasonably designing the numerical value of the included angle, the excitation of torque pulsation and cogging torque is reduced, and the order low-speed squeal of a motor of the whole vehicle is reduced.

Description

Motor rotor, driving motor and electric automobile

Technical Field

The invention relates to the technical field of motors, in particular to a motor rotor, a driving motor and an electric automobile.

Background

With the development of the automobile industry and the improvement of the automobile quality, noise, vibration and harshness (NVH) of the vehicle has become one of the key indicators of the automobile performance. For a motor in a new energy automobile, high-frequency noise of the motor is mainly caused by factors such as torque ripple, cogging torque and radial electromagnetic force.

When the vehicle is at a medium-low speed, the torque ripple and the cogging torque of the motor are main excitation sources for generating noise, so that the torque ripple and the cogging torque of the motor are reduced, and the important effect on improving the NVH performance of the whole vehicle is achieved. In the prior art, in order to reduce the torque ripple and the cogging torque of the motor, the structure of the motor is changed, such as a stator skewed slot, a rotor linear skewed pole, a rotor V-shaped skewed pole, and the like. However, these methods have the disadvantages of complicated wire-inserting process, excitation of low-order modes of the stator and the rotor to generate extra noise, and the like, and it is difficult to improve the NVH performance of the entire vehicle.

Disclosure of Invention

In order to solve the above problems, embodiments of the present application provide a motor rotor, a driving motor, and an electric vehicle, in which a rotor core of a rotor part is segmented, and a specific angle is formed between D-axes of each segment of the rotor core, so that torque ripple components of higher harmonics are offset by a phase difference, excitation of torque ripple and cogging torque is reduced, and thus, order low-speed squeal of a vehicle motor is reduced.

Therefore, the embodiment of the application adopts the following technical scheme:

in a first aspect, the present application provides an electric machine rotor comprising: the rotating shaft comprises at least one first fixing component, and the at least one first fixing component is arranged along the axial direction of the rotating shaft; the rotor core comprises a plurality of magnetic steel slot structures and at least one second fixing assembly, the magnetic steel slot structures are used for nesting magnetic steel, the at least one second fixing assembly is arranged at a central through hole of the rotor core and is used for being coupled with the at least one first fixing assembly when the rotor core is nested on the rotating shaft, and N is a positive integer greater than or equal to 2; the N rotor cores comprise at least one first rotor core and at least one second rotor core, and the first rotor cores and the second rotor cores are sequentially nested on the rotating shaft at intervals; an included angle between a radial symmetric axis of each second fixing component on the first rotor core and a symmetric axis of a magnetic steel groove structure adjacent to the second fixing component is alpha, and the symmetric axis of the magnetic steel groove structure adjacent to the second fixing component is positioned on a first side of the radial symmetric axis of the second fixing component; an included angle between a radial symmetric axis of each second fixing component on the second rotor core and a symmetric axis of the magnetic steel groove structure adjacent to the second fixing component is beta, the symmetric axis of the magnetic steel groove structure adjacent to the second fixing component is located on the second side of the radial symmetric axis of the second fixing component, and alpha and beta are greater than or equal to 0.

In this embodiment, the rotor part includes a rotating shaft and a plurality of two types of rotor cores, a fixing component is disposed on the rotating shaft, a fixing component is disposed on the central through hole of each rotor core, a certain included angle θ exists between the radial symmetric axis of the fixing component on each rotor core and the D axis adjacent to the fixing component, the radial symmetric axis of the fixing component of one type of rotor core is located on one side of the D axis adjacent to the fixing component, the radial symmetric axis of the fixing component of the other type of rotor core is located on the other side of the D axis adjacent to the fixing component, when the two types of rotor cores are sequentially nested on the rotating shaft at intervals, the radial symmetric axis of the fixing component of each rotor core is on a straight line, the included angle between the D axes of two adjacent rotor cores is 2 θ, and the included angle between the D axes of two rotor cores at intervals is 0, the D shafts on all rotor cores on the whole rotor part are arranged in a staggered mode, then torque fluctuation components of higher harmonics are counteracted through phase differences by reasonably designing a theta numerical value, and excitation of torque pulsation and cogging torque is reduced, so that the order low-speed squeal of a motor of the whole vehicle is reduced. Moreover, when production rotor core, rotor core is difficult to accomplish horizontally, if only use a rotor core, positive and negative stack in turn, can appear the gap between the rotor core, so this application adopts two kinds of different rotor cores, and with two kinds of rotor core's protruding one side (or concave one side) whole up, can not have the gap between the rotor core that the stack was come out, prevents the magnetic leakage.

In this embodiment, the degrees of the included angle α and the included angle β are different.

In this embodiment, the included angle α degrees are the same for each first rotor core and the included angle β degrees are the same for each second rotor core. The included angle alpha degree on each first rotor iron core is different, and the included angle beta degree on each second rotor iron core is different.

In this embodiment, the first fixing component is a groove structure, the second fixing component is a protrusion structure, the groove structure is a portion of the rotating shaft lower than the circumference of the rotating shaft, and the protrusion structure is a portion of the rotor core higher than the circumference of the rotor core.

In this embodiment, the first and second securing members are rectangular in shape.

In one embodiment, the first fixing element is in the shape of a circular arc, and the side coupled with the second fixing element is a plane; the second fixing component is arc-shaped, and one side coupled with the first fixing component is a plane.

In one embodiment, the rotor cores each include at least two lightening holes between an outer edge of the rotor core and the central through hole.

In this embodiment, by providing a plurality of lightening holes in the rotor core, the weight of the rotor core can be effectively reduced, so that when the rotor portion rotates inside the stator portion, the electric energy due to overcoming the weight of the rotor portion is reduced.

In one embodiment, each second fixing assembly is located on a symmetry axis of the magnetic steel slot structure adjacent to the second fixing assembly.

In this embodiment, the second fixing component is disposed on the central through hole of the rotor core and on one D-axis, so that the included angle between the second fixing component and the D-axis is small, and the second fixing component can be associated with the stator tooth grooves of the stator part, so that the rotor part and the stator part are better matched, and torque pulsation and tooth groove torque of a specific order are offset.

In one embodiment, at least two compensation elements are arranged on the edge side of the rotor core and on the symmetry axis of each magnetic steel slot structure and/or on both sides of the symmetry axis; wherein the number, location and size of the compensating elements are such as to match the topology between the rotor and stator sections.

In the embodiment, by reasonably adjusting the modification parameters of the outer surface of the rotor sheet, for example, the outer edges of the rotor sheet are provided with different numbers of bulges or grooves, the outer edges of the rotor sheet are provided with the bulges or grooves at different positions, the depth and the opening shape of the bulges or grooves are changed, and the like, topological structures between the rotor part and the stator part are matched, so that under the premise of not increasing the cost and the manufacturing difficulty of the motor, the cogging torque in no-load can be effectively reduced, and a better NVH effect can be achieved by matching with the skewed pole; the torque pulsation of the motor under the large-load operation condition can be effectively reduced, and the noise caused by the torque pulsation of the motor is reduced; the electromagnetic force of the specific order can be effectively reduced, and the noise of the specific order is reduced.

In one embodiment, the magnetic steel groove structure comprises a first magnetic steel groove, a second magnetic steel groove, a third magnetic steel groove and a fourth magnetic steel groove, wherein the first magnetic steel groove and the second magnetic steel groove have the same shape, and the third magnetic steel groove and the fourth magnetic steel groove have the same shape; wherein, the direction that first magnet steel groove extends with the direction that the second magnet steel groove extends is crossing, the direction that the third magnet steel groove extends with the direction that the fourth magnet steel groove extends is crossing, just first magnet steel groove with between the second magnet steel groove with between the third magnet steel groove with about between the fourth magnet steel groove the symmetry axis symmetry of magnet steel groove structure.

In one embodiment, the electric machine rotor is specifically: the rotating shaft comprises two first fixing assemblies, and the two first fixing assemblies are arranged along the axial direction of the rotating shaft; the rotor core comprises 6 magnetic steel slot structures and two second fixing assemblies, the magnetic steel slot structures are used for nesting magnetic steel, and the at least one second fixing assembly is arranged at a central through hole of the rotor core and is used for being coupled with the at least one first fixing assembly when the rotor core is nested on the rotating shaft; the magnetic steel groove structure comprises a first magnetic steel groove, a second magnetic steel groove, a third magnetic steel groove and a fourth magnetic steel groove, the first magnetic steel groove and the second magnetic steel groove are the same in shape, and the third magnetic steel groove and the fourth magnetic steel groove are the same in shape; the extending direction of the first magnetic steel groove is intersected with the extending direction of the second magnetic steel groove, the extending direction of the third magnetic steel groove is intersected with the extending direction of the fourth magnetic steel groove, and the first magnetic steel groove and the second magnetic steel groove and the third magnetic steel groove and the fourth magnetic steel groove are symmetrical about a symmetry axis of the magnetic steel groove structure; the four rotor cores comprise two first rotor cores and two second rotor cores, and the first rotor cores and the second rotor cores are sequentially nested on the rotating shaft at intervals; an included angle between a radial symmetric axis of each second fixing component on the first rotor core and a symmetric axis of a magnetic steel groove structure adjacent to the second fixing component is alpha, and the symmetric axis of the magnetic steel groove structure adjacent to the second fixing component is positioned on a first side of the radial symmetric axis of the second fixing component; an included angle between the radial symmetric axis of each second fixing component on the second rotor core and the symmetric axis of the magnetic steel groove structure adjacent to the second fixing component is beta, the symmetric axis of the magnetic steel groove structure adjacent to the second fixing component is located on the second side of the radial symmetric axis of the second fixing component, the sum of alpha and beta is a fixed value theta, and theta is greater than 0.

In one embodiment, the θ satisfies

Wherein z is the number of stator slots of the stator portion, and θ is α + β.

In the embodiment, an included angle theta between a radial symmetry axis of a fixing component on each rotor core and an adjacent D axis of the fixing component is related to the number of stator tooth grooves of the stator part, and the included angle theta is determined according to the number of the stator tooth grooves, so that the designed rotor part and the stator part are better matched, and torque pulsation and tooth groove torque of a specific order are counteracted.

In one embodiment, the θ is 3.33 degrees.

In one embodiment, the rotor core includes at least two rotor sheets, and the at least two rotor sheets are stacked to form the rotor core.

In the embodiment, the plurality of rotor punching sheets are laminated to form the iron core, so that the eddy current loss can be reduced, and the efficiency is improved.

In a second aspect, embodiments of the present application provide an electric machine rotor, including: the rotating shaft comprises at least one first fixing component, and the at least one first fixing component is arranged along the axial direction of the rotating shaft; the rotor core comprises a plurality of magnetic steel slot structures and at least one second fixing assembly, the magnetic steel slot structures are used for nesting magnetic steel, the at least one second fixing assembly is arranged at a central through hole of the rotor core and is used for being coupled with the at least one first fixing assembly when the rotor core is nested on the rotating shaft, and N is a positive integer greater than or equal to 2; the N rotor cores comprise at least one first rotor core and at least one second rotor core, and the first rotor cores and the second rotor cores are sequentially nested on the rotating shaft at intervals; an included angle between a radial symmetric axis of each second fixing component on the first rotor core and a symmetric axis of the first magnetic steel groove structure is alpha, and the first magnetic steel groove structure is a magnetic steel groove structure on the first side of the radial symmetric axis of the second fixing component; an included angle between a radial symmetric axis of each second fixing component on the second rotor core and a symmetric axis of the second magnetic steel groove structure is beta, the second magnetic steel groove structure is a magnetic steel groove structure on the first side of the radial symmetric axis of the second fixing component, alpha and beta are more than or equal to 0, the difference between alpha and beta is a fixed value theta, and theta is more than 0.

In one embodiment, the included angle α degrees are the same for each first rotor core and the included angle β degrees are the same for each second rotor core.

In one embodiment, the included angle α degrees on each first rotor core are different and the included angle β degrees on each second rotor core are different.

In one embodiment, the electric machine rotor is specifically: the rotating shaft comprises two first fixing assemblies, and the two first fixing assemblies are arranged along the axial direction of the rotating shaft; the rotor core comprises 6 magnetic steel slot structures and two second fixing assemblies, the magnetic steel slot structures are used for nesting magnetic steel, and the at least one second fixing assembly is arranged at a central through hole of the rotor core and is used for being coupled with the at least one first fixing assembly when the rotor core is nested on the rotating shaft; the magnetic steel groove structure comprises a first magnetic steel groove, a second magnetic steel groove, a third magnetic steel groove and a fourth magnetic steel groove, the first magnetic steel groove and the second magnetic steel groove are the same in shape, and the third magnetic steel groove and the fourth magnetic steel groove are the same in shape; the extending direction of the first magnetic steel groove is intersected with the extending direction of the second magnetic steel groove, the extending direction of the third magnetic steel groove is intersected with the extending direction of the fourth magnetic steel groove, and the first magnetic steel groove and the second magnetic steel groove and the third magnetic steel groove and the fourth magnetic steel groove are symmetrical about a symmetry axis of the magnetic steel groove structure; the four rotor cores comprise two first rotor cores and two second rotor cores, and the first rotor cores and the second rotor cores are sequentially nested on the rotating shaft at intervals; an included angle between a radial symmetric axis of each second fixing component on the first rotor core and a symmetric axis of the first magnetic steel groove structure is alpha, and the first magnetic steel groove structure is a magnetic steel groove structure on the first side of the radial symmetric axis of the second fixing component; the included angle between the radial symmetric axis of each second fixing component on the second rotor core and the symmetric axis of the second magnetic steel groove structure is beta, the second magnetic steel groove structure is a magnetic steel groove structure on the first side of the radial symmetric axis of the second fixing component, and the difference between alpha and beta is a fixed value theta.

In one embodiment, the θ satisfies

Wherein z is the number of stator slots of the stator portion and θ ═ α - β |.

In one embodiment, the θ is 3.33 degrees.

In one embodiment, the rotor core includes at least two rotor laminations; the at least two rotor punching sheets are arranged in a stacked mode to form the rotor core.

In a third aspect, the present application provides a drive motor comprising at least one drive motor rotor for performing the various possible implementations of the first and second aspects.

In a fourth aspect, the present application provides an electric vehicle comprising at least one drive motor for performing the various possible implementations of the third aspect.

Additional features and advantages of the present application will be described in detail in the detailed description which follows.

Drawings

The drawings that accompany the detailed description can be briefly described as follows.

Fig. 1 is a schematic structural diagram of a driving motor according to an embodiment of the present disclosure;

FIG. 2 is a schematic structural diagram of a rotor portion provided in an embodiment of the present application;

fig. 3 is a schematic structural diagram of a rotating shaft according to an embodiment of the present disclosure;

fig. 4 is a schematic structural diagram of a rotating shaft according to an embodiment of the present disclosure;

fig. 5 is a schematic cross-sectional view of a rotor core according to an embodiment of the present application;

fig. 6 is a schematic cross-sectional view of a rotor core according to an embodiment of the present application

Fig. 7 is a schematic cross-sectional view of a rotor core according to an embodiment of the present application;

fig. 8 is a schematic cross-sectional view of a rotor core according to an embodiment of the present application;

fig. 9 is a schematic diagram illustrating distribution of included angles between a D-axis and a symmetric axis of a fixing assembly of a rotor core according to an embodiment of the present disclosure;

fig. 10 is a schematic cross-sectional view of a rotor core according to an embodiment of the present application;

fig. 11 is a schematic cross-sectional view of a rotor core according to an embodiment of the present application;

fig. 12 is a schematic diagram illustrating distribution of an included angle between a D-axis and a symmetric axis of a fixing assembly of a rotor core according to an embodiment of the present disclosure;

fig. 13 is a graph of simulated data of amplitudes of torque ripples of a rotor portion of a 6-pole 54-slot double-V motor with a skewed pole structure and a 6-pole 54-slot double-V motor with an untilted pole structure according to an embodiment of the present application at different rotation speeds.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.

In the description of the present application, the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application.

In the description of the present application, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may include, for example, a fixed connection, a detachable connection, an interference connection, or an integral connection; the specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The application technical scheme protection's a driving motor, including rotor part and stator part, the rotor part embedding is inside the stator part. The rotor part comprises a rotating shaft and N rotor cores. The rotor core is divided into a first rotor core and a second rotor core, the first rotor core and the second rotor core are sequentially overlapped in an alternate mode, and then the first rotor core and the second rotor core are nested on the rotating shaft. Wherein N is a positive integer greater than 2.

In the embodiment of the application, in order to reduce the order noise of the motor, a plurality of first fixing assemblies are arranged on the rotating shaft and are respectively arranged on the rotating shaft in an axial mode. All include a plurality of magnet steel groove structures and the fixed subassembly of second the same with first fixed subassembly quantity on first rotor core and the second rotor core, every magnet steel groove structure produces the structure of a magnetic pole after for embedding magnet steel, the symmetry axis of every magnet steel groove structure is quadrature axis (D axle), the fixed subassembly setting of every second is in rotor core's centre through hole department, the mode that sets up is the same with first fixed subassembly, make when rotor core gomphosis to the pivot, can with the epaxial first fixed subassembly coupling of commentaries on classics. The first rotor core and the second rotor core are overlapped together in a sequential alternate mode and are nested in the rotating shaft, and the first rotor core and the second rotor core are fixed on the rotating shaft through the coupling of the first fixing component and the second fixing component. For the first rotor core, an included angle between a symmetric axis (namely a radial symmetric axis) of the second fixing component, which is intersected with the circle center of the rotor core, and a D axis nearest to the second fixing component is alpha; for the second rotor core, the included angle between the radial symmetry axis of the second fixing component and the nearest D axis of the second fixing component is beta. Wherein both α and β are equal to or greater than 0. Optionally, the included angle α degree on each first rotor core may be the same or different, and the included angle β degree on each second rotor core may be the same or different.

The distribution relationship between each second fixing component on different rotor cores and the nearest D axis of the second fixing component has two possible situations, which are respectively:

in one possible implementation example, the nearest D-axis of each second fixing element on the first rotor core is located on one side of the radial symmetry axis of the second fixing element, and the nearest D-axis of each second fixing element on the second rotor core is located on the other side of the radial symmetry axis of the second fixing element. At this time, the sum of the included angle α on the first rotor core and the included angle β on the second rotor core is a fixed value θ.

In another possible implementation example, the closest D axis on the left side (or right side) of each second fixing component on the first rotor core forms an angle α with the radial symmetry axis of the second fixing component; the angle between the nearest D axis on the left side (or right side) of each second fixing component on the second rotor core and the radial symmetry axis of the second fixing component is beta. At this time, the difference between the included angle α on the first rotor core and the included angle β on the second rotor core is a fixed value θ.

And viewed from the whole rotor part, the included angle between the D shafts on the adjacent first rotor iron cores and the second rotor iron cores is theta, and the included angle between the D shafts on the first rotor iron cores or the second rotor iron cores which are arranged alternately is 0, so that the D shafts on all the rotor iron cores on the whole rotor part are in staggered arrangement. According to the method and the device, the torque fluctuation component of the higher harmonic is counteracted through the phase difference by reasonably designing the theta value, and the excitation of torque pulsation and cogging torque is reduced, so that the order low-speed squeal of the motor of the whole vehicle is reduced.

Simultaneously, when producing rotor core, rotor core is difficult to accomplish horizontally, if only use a rotor core, positive and negative stack in turn, can appear the gap between the rotor core, so this application adopts two kinds of different rotor cores, can adopt double-row mould mode production, also has two models of producing two kinds of rotor cores respectively on a mould, and this kind of mode processing does not need positive and negative pressure-superposed, and the control in interval between the rotor core is good, and reduction in production cost, improves the beat.

The scheme of the present application is described below by taking a 6-pole 54-slot double-V-shaped magnetic steel permanent magnet synchronous motor as an example, the present application only takes the motor of the type as an example, and is not limited to the type and the type of the motor, and the scheme described above in the present application is also applicable to other types and types of motors.

Fig. 1 is a schematic structural diagram of a driving motor according to an embodiment of the present application. As shown in fig. 1, the driving motor includes a stator portion 10 and a rotor portion 20, and the rotor portion 20 is disposed inside the stator portion 10. In the driving motor, the stator portion 10 is generally formed by at least one stator lamination 110 and an armature winding 120, and the at least one stator lamination 110 is stacked together to form a circular ring. Each stator lamination 110 is provided with a groove, and a plurality of stator laminations 110 are stacked together to form a circular ring, so that 54 stator tooth grooves are formed for nesting the armature winding 120, and alternating magnetic flux is generated inside the stator part 10 when the armature winding 120 is electrified.

The rotor portion 20 includes at least one rotor core 210, a motor shaft 220, and a plurality of magnetic steels 230. At least one rotor core is stacked together and nested on the rotating shaft, and a plurality of magnetic steels 230 are respectively embedded into the magnetic steel slots on the stacked rotor cores 210, so that permanent magnetic flux is generated on the rotor part 20. When alternating current is passed through the armature windings 120 of the stator portion 10, the alternating magnetic flux generated interacts with the permanent magnetic flux generated by the rotor portion 20, causing the rotor portion 20 to rotate within the stator portion 10.

As shown in fig. 2, rotor portion 20 includes four rotor cores, namely, rotor core 211-1, rotor core 212-1, rotor core 211-2, and rotor core 212-2, on rotor portion 20. The rotor core 211-1 and the rotor core 211-2 are rotor cores having the same structure, and the rotor core 212-1 and the rotor core 212-2 are rotor cores having the same structure. The rotor cores nested on the rotating shaft 220 are arranged in sequence at intervals, so that the structure of each rotor core is different from that of the front rotor core and that of the rear rotor core.

In the embodiment of the present application, the number of the rotor cores on the rotor portion 20 is not limited to four as shown in fig. 2, but may be 2, 3, 5, 6 or any other number, and the present application is not limited herein. Similarly, the number of the rotor cores of each structure may be the same or different, and the present application is not limited thereto.

Referring to the rotating shaft 220 shown in fig. 3, the rotating shaft 220 includes two fixing members 221, and the two fixing members 221 are located at a position coupled to the rotor core in the middle of the rotating shaft 220 and located at two ends of the diameter of the rotating shaft 220, respectively, such that an axial symmetry axis line of the two fixing members 221 coincides with a certain diameter of the rotating shaft 220.

In the embodiment of the present application, the number of the fixing assemblies 221 on the rotating shaft 220 is not limited to 2 as shown in fig. 3, but may also be 1, 3, 4, 5, 6 or any other number, and the present application is not limited herein. In addition, the arrangement of the fixing assembly 221 in the present application is not limited to the arrangement shown in fig. 3 to 4, and may be any arrangement, and the present application is not limited thereto.

In addition, the shape of the fixing component 221 is not limited to the groove shown in fig. 3, and specifically, the fixing component may be a rectangular groove, and may also be a circular arc shape as shown in fig. 4, and a groove with other shapes such as a square shape, a trapezoid shape, and the like; the shape of the fixing member 221 may also be a protrusion, such as a protrusion with other shapes, such as a rectangle, a square, a trapezoid, etc., and the application is not limited thereto.

The rotor core 210 is a cylinder formed by stacking a plurality of annular silicon steel sheets having the same shape, and a cylindrical through hole is formed in the center of the rotor core. The central through hole is used to be nested on the rotating shaft 220, so that the rotor core 210 is fixed on the rotating shaft. Among them, the rotor core 210 includes a rotor core 211 and a rotor core 212.

Referring to rotor core 211 of fig. 5, rotor core 211 includes 6 magnetic steel slot structures, each of which includes four types of magnetic steel slots (2112-1, 2112-2, 2112-3, and 2112-4). Wherein, the extending direction of the magnetic steel slot 2112-1 and the extending direction of the magnetic steel slot 2112-3, the extending direction of the magnetic steel slot 2112-2 and the extending direction of the magnetic steel slot 2112-4, the shapes of two magnetic steel slots (2112-1 and 2112-2) close to the outer side of the rotor iron core 211 are the same, the extending directions of the two magnetic steel slots are intersected, and the position on the rotor iron core 211 is in a V shape (or an inverted V shape); the two magnetic steel slots (2112-3 and 2112-4) close to the inner side of the rotor core 211 are the same in shape, the extending directions of the two magnetic steel slots are intersected, and the position on the rotor core 211 is also in a V shape (or an inverted V shape). The V-shaped formed by the two magnetic steel grooves (2112-1 and 2112-2) on the outer side is superposed on the V-shaped upper side (namely close to the outer side of the rotor core 211) formed by the two magnetic steel grooves (2112-3 and 2112-4) on the inner side, thereby forming a magnetic steel groove structure with a double V-shaped structure. For one rotor core 211, a total of 6 magnetic steel slot structures with double V-shaped magnetic steel slots are completely the same in shape, and each magnetic steel slot structure generates one magnetic pole. For a double-V magnetic steel slot structure, as shown in the left small diagram in fig. 5, the central symmetry axis is the D axis. For one rotor core 211, there are 6 double V-shaped magnetic steel slot structures, so there are 6D-axes.

Rotor core 211 also includes two securing assemblies 2111. The two fixing components 2111 are located on the central through hole of the rotor core 211, and are located at two ends of the diameter of the central through hole, respectively, so that a connecting line of radial symmetry axes of the two fixing components 2111 coincides with a certain diameter of the central through hole of the rotor core 211.

The stationary assembly 2111 is generally positioned in the central bore of the rotor core 211 on the D-axis (slightly to the left) such that the axis of radial symmetry of the stationary assembly 2111 makes an angle (set at α) with the D-axis. When the rotor core 211 is nested on the rotating shaft 220, the radial symmetry axis of the fixing component 2111 on the rotor core 211 coincides with the symmetry axis of the fixing component 221 on the rotating shaft 220, and the D axis is located at the right side of the symmetry axis of the fixing component 221 on the rotating shaft 220.

In the embodiment of the present application, the number of the fixing assemblies 2111 on the rotor core 211 is not limited to 2 as shown in fig. 5, but may be 1, 3, 4 or any other number, and the present application is not limited herein. However, other numbers of fixing assemblies 2111 must be positioned on the rotor core 211 to couple with the fixing assemblies 221 on the rotating shaft 220 when the rotor core 211 is nested on the rotating shaft 220.

In addition, the shape of the fixing component 2111 is not limited to the protrusion shown in fig. 5, specifically, a rectangular protrusion, but may also be a circular arc shape as shown in fig. 6, and a protrusion with other shapes such as a square shape, a trapezoid shape, and the like; the fixing component 2111 may also be a rectangular groove as shown in fig. 3, an arc groove as shown in fig. 4, or a square, trapezoid or other shape groove, as long as it can be coupled with the fixing component 221 on the rotating shaft 220 when the rotor core 211 is nested on the rotating shaft 220, and the application is not limited herein.

As shown in fig. 7 for rotor core 212, rotor core 211 includes 6 magnetic steel slot structures, each of which includes four types of magnetic steel slots (2122-1, 2122-2, 2122-3, and 2122-4). Wherein, the extending direction of the magnetic steel groove 2122-1 and the extending direction of the magnetic steel groove 2122-3, the extending direction of the magnetic steel groove 2122-2 and the extending direction of the magnetic steel groove 2122-4, the shapes of the two magnetic steel grooves (2122-1 and 2122-2) close to the outer side of the rotor iron core 212 are the same, the extending directions of the two magnetic steel grooves are intersected, and the position on the rotor iron core 212 is in a V shape (or an inverted V shape); the two magnetic steel slots (2122-3 and 2122-4) near the inner side of the rotor core 212 have the same shape, and the extending directions of the two magnetic steel slots intersect, and the position on the rotor core 212 is also in a V shape (or an inverted V shape). The V-shaped magnetic steel grooves (2122-3 and 2122-4) on the inner side are overlapped to form a V-shaped upper side (namely, the upper side is close to the outer side of the rotor core 212) so as to form a magnetic steel groove structure with a double V-shaped structure. For one rotor core 212, a total of 6 magnetic steel slot structures with double V-shaped magnetic steel slots are completely the same in shape, and each magnetic steel slot structure generates one magnetic pole. For a double-V magnetic steel slot structure, as shown in the left small diagram in fig. 5, the central symmetry axis is the D axis. For one rotor core 212, there are 6 double V-shaped magnetic steel slot structures, so there are 6D-axes.

Rotor core 212 also includes two stationary assemblies 2121. The two fixing elements 2121 are located on the central through hole of the rotor core 212 and located at two ends of the diameter of the central through hole, respectively, so that a connecting line of the radial symmetry axes of the two fixing elements 2121 coincides with a certain diameter of the central through hole of the rotor core 212.

The mounting assembly 2121 is generally positioned in the central bore of the rotor core 212 and is positioned on the D-axis (slightly to the right) such that the radial symmetry axis of the mounting assembly 2121 is at an angle (set to β) to the D-axis. When the rotor core 212 is nested on the rotating shaft 220, the radial symmetry axis of the fixing assembly 2121 on the rotor core 212 coincides with the symmetry axis of the fixing assembly 221 on the rotating shaft 220, and the D axis is located at the left side of the symmetry axis of the fixing assembly 221 on the rotating shaft 220.

In the embodiment of the present application, the number of the fixing assemblies 2121 on the rotor core 212 is not limited to 2 as shown in fig. 7, and may be 1, 3, 4 or any other number, which is not limited herein. However, any number of other fixing elements 2121 may be positioned on the rotor core 212 to couple with the fixing elements 221 on the shaft 220 when the rotor core 212 is nested on the shaft 220.

In addition, the shape of the fixing member 2121 is not limited to the protrusion shown in fig. 7, and specifically, the fixing member may be a rectangular protrusion, and may also be a circular arc shape as shown in fig. 8, or a protrusion having another shape such as a square shape, a trapezoid shape, or the like; the shape of the fixing element 2121 may also be a rectangular groove as shown in fig. 3 and a circular arc groove as shown in fig. 4, or a groove with other shapes such as a square shape, a trapezoid shape, etc., as long as the fixing element can be coupled with the fixing element 221 on the rotating shaft 220 when the rotor core 212 is nested on the rotating shaft 220, and the application is not limited herein.

It should be noted that the position of the fixing component 2111 (or the fixing component 2121) on the rotor core 211 (or the rotor core 212) in the present application is not limited to the position on the D axis shown in fig. 5-6 (or fig. 7-8), and may be any position between two D axes, and the present application is not limited thereto. However, if the fixing assembly 2111 is located at any position between the two D-axes, the included angle θ between the radial symmetry axis of the fixing assembly 2111 and the D-axis does not satisfy the relationship of formula (1), and the specific value is determined by experimental simulation.

In the embodiment of the present application, as shown in fig. 9, the

rotor cores

211 and 212 are sequentially stacked at intervals and are nested on the rotating shaft 220, and the radial symmetry axis of the fixing component on each rotor core coincides with the symmetry axis of the fixing component 221 on the rotating shaft 220 and is located on a straight line. D-axes of rotor core 211-1 and rotor core 211-2 are located at one side of the symmetry axis of fixing member 221 on rotation shaft 220, and D-axes of rotor core 212-1 and rotor core 212-2 are located at the other side of the symmetry axis of fixing member 221 on rotation shaft 220, so that an included angle between D-axes of

adjacent rotor cores

211 and 212 is a sum of α and β (i.e., θ), and an included angle between D-axes of

adjacent rotor cores

211 or 211 is 0.

Alternatively, like the rotor core 211 shown in fig. 10, compared to the rotor core 211 shown in fig. 5, the fixing component 2111 on the rotor core 211 shown in fig. 10 is not on the D axis and is located on the right side of the D axis; as with the rotor core 212 shown in fig. 11, the fixing member 2121 on the rotor core 212 shown in fig. 11 is not on the D-axis and is also located on the right side of the D-axis, compared to the rotor core 212 shown in fig. 7.

As shown in fig. 12, a plurality of rotor cores 211 shown in fig. 10 and a plurality of rotor cores 212 shown in fig. 11 are sequentially stacked at intervals and are nested on the rotating shaft 220, and the radial symmetry axis of the fixing assembly on each rotor core is coincident with the symmetry axis of the fixing assembly 221 on the rotating shaft 220 and is in a straight line. D-axes of rotor core 211-1 and rotor core 211-2 are located at the left side of the symmetry axis of fixing member 221 on rotating shaft 220, and D-axes of rotor core 212-1 and rotor core 212-2 are also located at the left side of the symmetry axis of fixing member 221 on rotating shaft 220, so that the included angle between the D-axes of

adjacent rotor cores

211 and 212 is the difference between α and β (i.e., θ), and the included angle between the D-axes of

adjacent rotor cores

211 or 211 is 0.

In the embodiment of the present application, the fixed value θ is generally related to the number of stator slots on the stator portion 10, and satisfies the following relationship:

wherein z is the number of stator slots of the stator part, θ ═ α + β or θ ═ α - β |. In the present application, the θ degree is 3.33 °.

This application is through letting the D axle on all rotor cores on whole rotor part 20 be the staggered arrangement for there is certain contained angle between the D axle of adjacent rotor core, does not have the contained angle between the D axle of alternate rotor core, then the rational design contained angle numerical value, realizes offsetting the torque fluctuation component of higher harmonic through the phase difference, reduces the excitation of torque pulsation and tooth's socket torque, thereby reduces whole car motor order low-speed squeal. Meanwhile, only two different rotor cores are used, and the difference between each rotor core is small, namely the position of one second fixing component is located on one side of the shaft D, and the position of the other second fixing component is located on the other side of the shaft D, so that the segmented rotor cores can be produced by using the same set of die, and the production cost is reduced.

In the above embodiment, this application has adopted two kinds of different rotor cores, also let the radial symmetry axis of a rotor core's fixed subassembly be located D axle one side, let another kind of rotor core's fixed subassembly's radial symmetry axis be located the opposite side of D axle. However, in a rotor core such as the rotor core 211, as shown in fig. 5, in a cross section (hereinafter referred to as "front surface") where the radial symmetry axis of the fixing member 2111 is located on the left side of the D axis, and in a rear cross section (hereinafter referred to as "rear surface") where the radial symmetry axis is located on the right side of the D axis. So this application can adopt a rotor core completely, and nested rotor core in the pivot, two liang of planes of mutual contact are the coplanar for the rotor core that the serial number is the odd number openly faces one direction, and the serial number is the rotor core of even number, openly faces another direction. Illustratively, the rotor core number 1 faces outward from the front side, and faces in the reverse direction toward the rotor core number 2, the rotor core number 2 faces toward the rotor core number 1 from the reverse side, the rotor core number 3 faces from the front side, and so on. This application only needs a rotor core through this kind of mode of setting, can greatly reduced this application driving motor's cost.

In the experimental simulation process, the 6-pole 54-slot double-V-shaped magnetic steel permanent magnet synchronous motor with the oblique pole structure (namely, the included angle between the D shafts on the adjacent rotor cores) shown in the figures 1-2 and the 6-pole 54-slot double-V-shaped magnetic steel permanent magnet synchronous motor with the non-oblique pole structure (namely, the included angle between the D shafts on all the rotor cores is 0) are simulated to obtain a simulation data diagram shown in the figure 13, and through result analysis, the torque pulsation of the driving motor designed by the application is obviously lower, and the noise is reduced by at least 8 dB.

Referring to fig. 5-6, the rotor core further includes a plurality of lightening holes (2113 or 2123). Through set up a plurality of lightening holes on rotor core, can effectual reduction rotor core's dead weight for rotor part 20 when stator part 10 is inside to rotate, reduces because of the electric energy of overcoming rotor part 20's weight. Preferably, the plurality of lightening holes are disposed on the rotor core at positions between the magnetic steel slots of each double V-shaped structure and the central through hole as shown in fig. 5-8, or between the magnetic steel slots of adjacent double V-shaped structures, and at other positions where the rotor core is not changed and the radial symmetry axis of the fixing component is a symmetric structure, so as to avoid making the rotor core an asymmetric structure, so that the rotation speed of the rotor portion 20 is not uniform when the rotor portion rotates inside the stator portion 10.

With reference to fig. 1-2, a plurality of compensating elements are disposed on the outer surface of each rotor core and on and/or on both sides of the D-axis. When the number of the compensating parts is even, each compensating part is positioned on two sides of the D shaft, and the number of the compensating parts on the two sides is the same; when the number of the compensating parts is odd, one of the compensating parts is positioned on the D shaft, the other compensating parts are positioned on two sides of the D shaft, and the number of the compensating parts on the two sides is the same. The compensation component is a groove or a bulge arranged on the side face of the edge of the rotor core.

According to the method, the topological structures of the rotor part and the stator part are matched by reasonably adjusting the trimming parameters of the outer surface of the rotor sheet, such as the way that the protrusions or the grooves with different numbers are arranged on the outer edge of the rotor sheet, the protrusions or the grooves are arranged on different positions of the outer edge of the rotor sheet, the depth and the opening shapes of the protrusions or the grooves are changed, and the like, so that the cogging torque during no-load can be effectively reduced on the premise of not increasing the cost and the manufacturing difficulty of the motor, and a better NVH effect can be achieved by matching with the oblique pole; the torque pulsation of the motor under the large-load operation condition can be effectively reduced, and the noise caused by the torque pulsation of the motor is reduced; the electromagnetic force of the specific order can be effectively reduced, and the noise of the specific order is reduced.

The embodiment of the present application further provides an electric vehicle, which includes at least one driving motor, where the driving motor may be the driving motor described in fig. 1 to 13 and corresponding contents. Since the electric vehicle includes the drive motor, the electric vehicle has all or at least some of the advantages of the drive motor.

Finally, the description is as follows: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.

Claims

1. An electric machine rotor, comprising:

the rotating shaft comprises at least one first fixing component, and the at least one first fixing component is arranged along the axial direction of the rotating shaft;

the rotor core comprises a plurality of magnetic steel slot structures and at least one second fixing assembly, the magnetic steel slot structures are used for nesting magnetic steel, the at least one second fixing assembly is arranged at a central through hole of the rotor core and is used for being coupled with the at least one first fixing assembly when the rotor core is nested on the rotating shaft, and N is a positive integer greater than or equal to 2;

the N rotor cores comprise at least one first rotor core and at least one second rotor core, and the first rotor cores and the second rotor cores are sequentially nested on the rotating shaft at intervals; an included angle between a radial symmetric axis of each second fixing component on the first rotor core and a symmetric axis of a magnetic steel groove structure adjacent to the second fixing component is alpha, and the symmetric axis of the magnetic steel groove structure adjacent to the second fixing component is positioned on a first side of the radial symmetric axis of the second fixing component; an included angle between a radial symmetric axis of each second fixing component on the second rotor core and a symmetric axis of the magnetic steel groove structure adjacent to the second fixing component is beta, the symmetric axis of the magnetic steel groove structure adjacent to the second fixing component is located on the second side of the radial symmetric axis of the second fixing component, and alpha and beta are greater than or equal to 0.

2. An electric machine rotor as claimed in claim 1, characterized in that the degrees of the included angle α and the included angle β are different.

3. An electric machine rotor as recited in claim 2, wherein the included angle α degrees on each first rotor core are the same and the included angle β degrees on each second rotor core are the same.

4. The electric machine rotor of claim 2, wherein said included angle α degrees on each first rotor core are different and said included angle β degrees on each second rotor core are different.

5. An electric machine rotor according to any of claims 1-4, characterized in that the first fixing member is a groove structure and the second fixing member is a protrusion structure, the groove structure being a portion of the rotation shaft lower than the circumference of the rotation shaft and the protrusion structure being a portion of the rotor core higher than the circumference of the rotor core.

6. An electric machine rotor as claimed in any of claims 1 to 4, characterised in that the first and second fixing assemblies are rectangular in shape.

7. The motor rotor as claimed in any one of claims 1 to 4, wherein the first fixing member has a circular arc shape, and a side coupled with the second fixing member is a plane; the second fixing component is arc-shaped, and one side coupled with the first fixing component is a plane.

8. An electric machine rotor as recited in any of claims 1-4, wherein the rotor cores each include at least two lightening holes between an outer edge of the rotor core and the central through hole.

9. An electric machine rotor according to any of claims 1 to 4, wherein each second fixing element is located on the axis of symmetry of the magnetic steel slot structure adjacent to that second fixing element.

10. The electric machine rotor of any of claims 1-4, wherein the magnet steel slot structure comprises a first magnet steel slot, a second magnet steel slot, a third magnet steel slot, and a fourth magnet steel slot, the first magnet steel slot being the same shape as the second magnet steel slot, the third magnet steel slot being the same shape as the fourth magnet steel slot;

wherein, the direction that first magnet steel groove extends with the direction that the second magnet steel groove extends is crossing, the direction that the third magnet steel groove extends with the direction that the fourth magnet steel groove extends is crossing, just first magnet steel groove with between the second magnet steel groove with between the third magnet steel groove with about between the fourth magnet steel groove the symmetry axis symmetry of magnet steel groove structure.

11. The electric machine rotor according to any of claims 1-4, characterized in that the electric machine rotor is in particular:

the rotating shaft comprises two first fixing assemblies, and the two first fixing assemblies are arranged along the axial direction of the rotating shaft;

the rotor core comprises 6 magnetic steel slot structures and two second fixing assemblies, the magnetic steel slot structures are used for nesting magnetic steel, and the at least one second fixing assembly is arranged at a central through hole of the rotor core and is used for being coupled with the at least one first fixing assembly when the rotor core is nested on the rotating shaft;

the magnetic steel groove structure comprises a first magnetic steel groove, a second magnetic steel groove, a third magnetic steel groove and a fourth magnetic steel groove, the first magnetic steel groove and the second magnetic steel groove are the same in shape, and the third magnetic steel groove and the fourth magnetic steel groove are the same in shape; the extending direction of the first magnetic steel groove is intersected with the extending direction of the second magnetic steel groove, the extending direction of the third magnetic steel groove is intersected with the extending direction of the fourth magnetic steel groove, and the first magnetic steel groove and the second magnetic steel groove and the third magnetic steel groove and the fourth magnetic steel groove are symmetrical about a symmetry axis of the magnetic steel groove structure;

the four rotor cores comprise two first rotor cores and two second rotor cores, and the first rotor cores and the second rotor cores are sequentially nested on the rotating shaft at intervals; an included angle between a radial symmetric axis of each second fixing component on the first rotor core and a symmetric axis of a magnetic steel groove structure adjacent to the second fixing component is alpha, and the symmetric axis of the magnetic steel groove structure adjacent to the second fixing component is positioned on a first side of the radial symmetric axis of the second fixing component; an included angle between the radial symmetric axis of each second fixing component on the second rotor core and the symmetric axis of the magnetic steel groove structure adjacent to the second fixing component is beta, the symmetric axis of the magnetic steel groove structure adjacent to the second fixing component is located on the second side of the radial symmetric axis of the second fixing component, the sum of alpha and beta is a fixed value theta, and theta is greater than 0.

12. The electric machine rotor as recited in claim 11, wherein θ satisfies

13. An electric machine rotor as claimed in claim 11 or 12, characterised in that θ is 3.33 degrees.

14. The electric machine rotor of any one of claims 11 or 12, wherein the rotor core comprises at least two rotor laminations; the at least two rotor punching sheets are arranged in a stacked mode to form the rotor core.

15. An electric machine rotor, comprising:

the N rotor cores comprise at least one first rotor core and at least one second rotor core, and the first rotor cores and the second rotor cores are sequentially nested on the rotating shaft at intervals; an included angle between a radial symmetric axis of each second fixing component on the first rotor core and a symmetric axis of the first magnetic steel groove structure is alpha, and the first magnetic steel groove structure is a magnetic steel groove structure on the first side of the radial symmetric axis of the second fixing component; an included angle between a radial symmetric axis of each second fixing component on the second rotor core and a symmetric axis of the second magnetic steel groove structure is beta, the second magnetic steel groove structure is a magnetic steel groove structure on the first side of the radial symmetric axis of the second fixing component, alpha and beta are more than or equal to 0, the difference between alpha and beta is a fixed value theta, and theta is more than 0.

16. The electric machine rotor of claim 15, wherein the included angle α degrees on each first rotor core are the same and the included angle β degrees on each second rotor core are the same.

17. The electric machine rotor of claim 15, wherein said included angle α degrees on each first rotor core are different and said included angle β degrees on each second rotor core are different.

18. The electric machine rotor of any of claims 15-17, wherein the magnet steel slot structure comprises a first magnet steel slot, a second magnet steel slot, a third magnet steel slot, and a fourth magnet steel slot, the first magnet steel slot being the same shape as the second magnet steel slot, the third magnet steel slot being the same shape as the fourth magnet steel slot;

19. The electric machine rotor according to any of claims 15-17, characterized in that the electric machine rotor is embodied as:

the four rotor cores comprise two first rotor cores and two second rotor cores, and the first rotor cores and the second rotor cores are sequentially nested on the rotating shaft at intervals; an included angle between a radial symmetric axis of each second fixing component on the first rotor core and a symmetric axis of the first magnetic steel groove structure is alpha, and the first magnetic steel groove structure is a magnetic steel groove structure on the first side of the radial symmetric axis of the second fixing component; the included angle between the radial symmetric axis of each second fixing component on the second rotor core and the symmetric axis of the second magnetic steel groove structure is beta, the second magnetic steel groove structure is a magnetic steel groove structure on the first side of the radial symmetric axis of the second fixing component, and the difference between alpha and beta is a fixed value theta.

20. The electric machine rotor as recited in claim 19, wherein θ satisfies

21. An electric machine rotor as claimed in any of claims 19 or 20, wherein θ is 3.33 degrees.

22. An electric machine rotor as claimed in any of claims 19 or 20, wherein the rotor core comprises at least two rotor laminations; the at least two rotor punching sheets are arranged in a stacked mode to form the rotor core.

23. A drive motor, characterized by comprising at least one motor rotor for carrying out any one of claims 1-22.

24. An electric vehicle comprising at least one electric drive motor for carrying out the drive of claim 23.