Motor rotor assembly and driving motor

Abstract

The invention provides a motor rotor assembly and a driving motor, and the motor rotor assembly comprises a rotating shaft which is provided with a stepped groove, the stepped groove comprises a plurality of groove bodies, and the plurality of groove bodies are sequentially communicated along the axial direction of the rotating shaft, so that the first side wall of the stepped groove is in a stepped surface shape; each rotor core assembly is annular, a convex key is arranged on the inner ring wall of each rotor core assembly in a protruding mode, the rotor core assemblies are arranged on the rotating shaft in a sleeving mode and arranged in the axial direction of the rotating shaft, the convex keys are inserted into the multiple sections of groove bodies in a one-to-one correspondence mode, and each convex key abuts against the first side wall. Through the arrangement, a stepped skewed pole rotor structure is formed, and the cogging torque and the torque ripple are effectively reduced; as the structures of the plurality of rotor core assemblies are the same, batch production can be carried out by only needing the same rotor core mold, and other types of rotor core molds do not need to be additionally developed, so that the manufacturing cost of the motor rotor assembly is effectively reduced, and the production and assembly efficiency is improved.

Description

Technical Field

[0001] The present application relates to the field of motor technology, and in particular to a motor rotor assembly and a drive motor. Background Art

[0002] Existing electric vehicles have increasingly higher requirements for drive motors, especially for the control accuracy of drive motors. Due to the mutual attraction between the magnetic field of the motor rotor and the stator teeth, cogging torque is generated, which causes fluctuations in the output torque of the motor and also causes noise and other problems.

[0003] In order to reduce the cogging torque, improve the control accuracy of the motor's output torque, and improve the noise problem, the most effective and widespread means is to design the motor rotor with segmented skewed poles. The most common segmented skewed pole solutions are currently ladder-type and V-type. The design methods of segmented skewed poles of motor rotors are:

[0004] (1) A rotor core with a key and multiple keyways arranged axially on the shaft;

[0005] (2) Two or three rotor cores with a key and a shaft with one or more keyways.

[0006] The above two segmented oblique pole design methods either require the development of more than two rotor core molds, which are realized by means of different circumferential positions and front and back sides of the keyways, or are realized by machining multiple keyways at the circumferential positions of the shaft. This has the problems of a large number of rotor core development molds and high shaft keyway machining costs, which is not conducive to controlling production costs. Summary of the invention

[0007] In view of this, the present application provides a motor rotor assembly and a drive motor, which can reduce the manufacturing cost of the motor rotor assembly.

[0008] Specifically, the following technical solutions are included:

[0009] In a first aspect, the present application provides a motor rotor assembly, the motor rotor assembly comprising:

[0010] The rotating shaft is provided with a stepped groove, wherein the stepped groove comprises a plurality of groove bodies, and the plurality of groove bodies are sequentially connected along the axial direction of the rotating shaft, so that the first side wall of the stepped groove is in a stepped surface shape;

[0011] A plurality of rotor core assemblies, each of which is annular and has a convex key protruding from the inner ring wall, the plurality of rotor core assemblies are respectively sleeved on the rotating shaft and arranged along the axial direction of the rotating shaft, the plurality of convex keys are correspondingly inserted into the plurality of sections of the slot body, and each of the convex keys abuts against the first side wall.

[0012] Through this arrangement, multiple rotor core assemblies are staggered at a certain angle in the circumferential direction of the rotating shaft to form a stepped skewed pole rotor structure, which effectively reduces the tooth slot torque and torque fluctuation. Since the structures of the multiple rotor core assemblies are the same, only the same type of rotor core mold is needed for mass production, and there is no need to develop other types of rotor core molds. At the same time, there is no need to open multiple keyways on the rotating shaft, which effectively reduces the manufacturing cost of the motor rotor assembly and improves the production and assembly efficiency.

[0013] In an optional embodiment, the included angles between the extension planes of any two adjacent step surfaces in the first side wall are the same.

[0014] Through this arrangement, multiple rotor core assemblies form a linear stepped skewed pole rotor structure, which effectively reduces the cogging torque and torque fluctuation, and improves the performance and stability of the drive motor.

[0015] In an optional embodiment, the second side wall of the stepped groove is planar and extends along the axial direction of the rotating shaft; from the first end to the second end of the rotating shaft, the groove widths of the multiple sections of the groove body increase in sequence;

[0016] Wherein, the second side wall is arranged opposite to the first side wall.

[0017] In this embodiment, one side of the multi-segment slot body is flushly arranged to form a planar second side wall. Since the slot widths of the multiple slot bodies are different, a stepped first side wall is formed on the other side of the multi-segment slot body.

[0018] In an optional embodiment, the width of each of the convex keys is equal to the groove width of the groove body closest to the first end of the rotating shaft.

[0019] This arrangement facilitates the positioning and assembly of the first rotor core assembly and the first slot body, and is conducive to the sequential stacking and press-fitting of other rotor core assemblies, thereby helping to improve assembly efficiency.

[0020] In an optional embodiment, a plurality of the rotor core assemblies are respectively interference fit with the rotating shaft.

[0021] This arrangement improves the connection strength between the rotor core assembly and the rotating shaft.

[0022] In an optional embodiment, the motor rotor assembly further includes a first dynamic balancing plate and a second dynamic balancing plate, wherein the first dynamic balancing plate and the second dynamic balancing plate are sleeved on the rotating shaft and spaced apart along the axial direction of the rotating shaft, and the multiple rotor core assemblies are located between the first dynamic balancing plate and the second dynamic balancing plate.

[0023] Through this arrangement, the mass distribution of the motor rotor assembly is adjusted so that the center of mass coincides with the rotation axis, so that the motor rotor assembly achieves dynamic balance during rotation, reduces vibration, and improves the stability of the motor rotor assembly.

[0024] In an optional embodiment, the first dynamic balancing plate and the second dynamic balancing plate are respectively transitionally matched with the rotating shaft.

[0025] Through this setting, a certain degree of matching accuracy can be guaranteed while a certain degree of freedom can be taken into account.

[0026] In an optional embodiment, the first dynamic balancing plate abuts against a shoulder of the rotating shaft;

[0027] The motor rotor assembly further includes a pressure ring, which is sleeved on the rotating shaft and abuts against a side of the second dynamic balancing plate that is away from the first dynamic balancing plate.

[0028] Through this arrangement, under the joint action of the shaft shoulder and the pressure ring, the first dynamic balancing plate, the second dynamic balancing plate and the multiple rotor core assemblies are axially fixed, preventing the first dynamic balancing plate, the second dynamic balancing plate and the multiple rotor core assemblies from axial movement.

[0029] In an optional embodiment, the pressure ring and the rotating shaft are interference fit.

[0030] Through this arrangement, the connection strength between the pressure ring and the rotating shaft is improved, and the first dynamic balancing plate, the second dynamic balancing plate and the plurality of rotor core assemblies are fixed axially and circumferentially.

[0031] In a second aspect, the present application provides a drive motor, wherein the drive motor comprises a motor rotor assembly provided in any embodiment of the first aspect.

[0032] The beneficial effects of the technical solution provided in the embodiment of the present application include at least: since the first side wall of the stepped groove is in the shape of a stepped surface, the multiple rotor core assemblies can be staggered at a certain angle in the circumferential direction of the shaft by inserting the convex keys of the multiple rotor core assemblies into the multi-section groove body one by one, and each convex key is in contact with the first side wall with the stepped surface, so that the multiple rotor core assemblies can be staggered at a certain angle in the circumferential direction of the shaft to form a stepped skewed pole rotor structure, which effectively reduces the tooth slot torque and torque fluctuation; since the structures of the multiple rotor core assemblies are the same, only the same type of rotor core mold is needed for mass production, and there is no need to develop other types of rotor core molds. At the same time, there is no need to open multiple keyways on the shaft, which effectively reduces the manufacturing cost of the motor rotor assembly and improves the production and assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 A schematic structural diagram of a rotating shaft of a motor rotor assembly provided in an embodiment of the present application;

[0035] Figure 2 A schematic diagram of the structure of a motor rotor assembly provided in an embodiment of the present application;

[0036] Figure 3 A side view of a rotating shaft of a motor rotor assembly provided in an embodiment of the present application;

[0037] Figure 4 A schematic diagram of the structure of a rotor core assembly provided in an embodiment of the present application;

[0038] Figure 5 A schematic diagram of the coordination of a rotating shaft and multiple rotor core assemblies provided in an embodiment of the present application;

[0039] Figure 6 A cross-sectional view of a motor rotor assembly provided in an embodiment of the present application.

[0040] The reference numerals in the figures represent respectively:

[0041] 1-rotating shaft; 11-step groove; 111-groove body; 111a-first groove body; 111b-second groove body; 111c-third groove body; 111d-fourth groove body; 112-bottom wall; 113-first side wall; 113a-step surface; 113b-connecting surface; 114-second side wall; 12-shaft shoulder;

[0042] 2-rotor core assembly; 2a-first rotor core assembly; 2b-second rotor core assembly; 2c-third rotor core assembly; 2d-fourth rotor core assembly; 21-rotor core; 22-magnetic steel; 23-convex key;

[0043] 3- first dynamic balance plate;

[0044] 4- second dynamic balancing plate;

[0045] 5- Press the circle.

[0046] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0048] The directional nouns involved in the embodiments of the present application, such as "upper", "lower", "side", etc., are generally represented by Figure 1 The relative relationship of the orientation shown in the figure is used as the basis, and these orientation terms are used only to more clearly describe the relationship between structures, not to describe absolute orientation. When the product is placed in different postures, the orientation may change, for example, "up" and "down" may be interchangeable.

[0049] The terms “include” and “comprising” indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0050] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0051] Unless otherwise defined, all technical terms used in the embodiments of the present application have the same meanings as commonly understood by those of ordinary skill in the art.

[0052] Existing electric vehicles have increasingly higher requirements for drive motors, especially for the control accuracy of drive motors. Due to the mutual attraction between the magnetic field of the motor rotor and the stator teeth, cogging torque is generated, which causes fluctuations in the output torque of the motor and also causes noise and other problems.

[0053] In order to reduce the cogging torque, improve the control accuracy of the motor's output torque, and improve the noise problem, the most effective and widespread means is to design the motor rotor with segmented skewed poles. The most common segmented skewed pole solutions are currently ladder-type and V-type. The design methods of segmented skewed poles of motor rotors are:

[0054] (1) A rotor core with a key and multiple keyways arranged axially on the shaft;

[0055] (2) Two or three rotor cores with a key and a shaft with one or more keyways.

[0056] The above two segmented oblique pole design methods either require the development of more than two rotor core molds, which are realized by means of different circumferential positions and front and back sides of the keyways, or are realized by machining multiple keyways at the circumferential positions of the shaft. This has the problems of a large number of rotor core development molds and high shaft keyway machining costs, which is not conducive to controlling production costs.

[0057] In order to solve the above technical problems, an embodiment of the present application provides a motor rotor assembly and a drive motor.

[0058] In order to make the technical solutions and advantages of the present application more clear, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0059] like Figures 1 to 6 As shown, the motor rotor assembly provided in the embodiment of the present application includes a rotating shaft 1 and a plurality of rotor core assemblies 2.

[0060] The rotating shaft 1 is provided with a stepped groove 11 , which includes a plurality of groove bodies 111 . The plurality of groove bodies 111 are sequentially connected along the axial direction of the rotating shaft 1 , so that a first side wall 113 of the stepped groove 11 is in a stepped surface shape.

[0061] like Figure 1 or Figure 3 As shown, the stepped groove 11 has a bottom wall 112, and a first side wall 113 is perpendicular or inclined to the bottom wall 112. The first side wall 113 has a plurality of step surfaces 113a, and the plurality of step surfaces 113a are distributed at intervals along the circumference of the rotating shaft 1, and two adjacent step surfaces 113a are connected by a connecting surface 113b perpendicular to the axial direction of the rotating shaft 1.

[0062] Each rotor core assembly 2 is annular and has a key 23 protruding from the inner ring wall. Multiple rotor core assemblies 2 are respectively sleeved on the rotating shaft 1 and arranged along the axial direction of the rotating shaft 1. Multiple keys 23 are inserted into the multi-section groove body 111 one by one, and each key 23 abuts against the first side wall 113.

[0063] Specifically, Figure 4 As shown, the rotor core assembly 2 includes a rotor core 21 and a magnetic steel 22 , and the magnetic steel 22 is assembled in the rotor core 21 by adhesive.

[0064] Each rotor core assembly 2 is provided with a convex key 23, such as Figure 4As shown, the convex key 23 is roughly in the shape of a rectangular block, and the convex key 23 protrudes relative to the inner ring wall of the rotor core assembly 2 toward the direction where the central axis of the rotating shaft 1 is located.

[0065] In the embodiment of the present application, the shapes and structures of the plurality of rotor core assemblies 2 are the same and can be mass-produced by using the same rotor core 21 mold.

[0066] In some prior art, the motor shaft is provided with a common bar keyway, and the convex keys of multiple rotor cores are inserted into the bar keyway and arranged in a straight line. In order to form a stepped skewed-pole rotor structure, the relative positions of the convex keys in the rotor core need to be different to ensure that the rotor cores are staggered at a certain angle in the circumferential direction of the shaft. In other words, multiple rotor cores cannot be manufactured using the same rotor core mold, but multiple rotor core molds need to be developed, which increases the production cost of the motor.

[0067] In the motor rotor assembly provided in the embodiment of the present application, the multiple rotor core assemblies 2 have the same shape and structure, and the relative position of the convex key 23 in each rotor core assembly 2 is the same. There is no need to develop multiple rotor core 21 molds. It is only necessary to abut each rotor core assembly 2 against the step surface 113a of the first side wall 113 of the step groove 11, so that the multiple rotor core assemblies 2 can be staggered at a certain angle in the circumferential direction of the rotating shaft 1 to form a stepped skewed pole rotor structure, thereby effectively reducing the production and manufacturing cost of the motor rotor assembly.

[0068] The number of slots 111 and the number of rotor core assemblies 2 can be set according to actual needs, and this application does not make specific restrictions. Figure 1 and Figure 2 As shown, the stepped slot 11 includes four slot bodies 111 , and the number of the rotor core assemblies 2 is four.

[0069] The motor rotor assembly provided in the embodiment of the present application has a first side wall 113 of the stepped groove 11 in the shape of a stepped surface. Therefore, by inserting the convex keys 23 of the multiple rotor core assemblies 2 into the multi-segment groove body 111 in a one-to-one correspondence, and each convex key 23 abuts against the first side wall 113 with the stepped surface, the multiple rotor core assemblies 2 can be staggered at a certain angle in the circumferential direction of the rotating shaft 1 to form a stepped skewed pole rotor structure, which effectively reduces the tooth slot torque and torque fluctuation; since the multiple rotor core assemblies 2 have the same structure, only the same type of rotor core mold is needed for mass production, and there is no need to develop other types of rotor core molds. At the same time, there is no need to open multiple key slots on the rotating shaft 1, which effectively reduces the manufacturing cost of the motor rotor assembly and improves the production and assembly efficiency.

[0070] In a further embodiment, the included angles between the extension planes of any two adjacent step surfaces 113 a in the first side wall 113 are the same.

[0071] In this embodiment, any two adjacent step surfaces 113 a are inclined with respect to each other, and an angle between the extension planes of the adjacent step surfaces 113 a is θ.

[0072] For example, Figure 2 As shown, the first rotor core assembly 2a, the second rotor core assembly 2b, the third rotor core assembly 2c and the fourth rotor core assembly 2d are sequentially mounted on the rotating shaft 1. The side surface of each rotor core assembly 2 used to abut against the first side wall 113 is called an abutment surface. Since the angle between the extension planes of adjacent step surfaces 113a is θ, the angle between the abutment surface of the second rotor core assembly 2b and the abutment surface of the first rotor core assembly 2a in the circumferential direction of the rotating shaft 1 is θ, the angle between the abutment surface of the third rotor core assembly 2c and the abutment surface of the first rotor core assembly 2a in the circumferential direction of the rotating shaft 1 is 2θ, and the angle between the abutment surface of the fourth rotor core assembly 2d and the abutment surface of the first rotor core assembly 2a in the circumferential direction of the rotating shaft 1 is 3θ. Please refer to Figure 5 , Figure 5 is a side view of a rotating shaft 1 and a plurality of rotor core assemblies 2, Figure 5 An angle 3θ between the abutting surface of the first rotor core assembly 2a and the abutting surface of the fourth rotor core assembly 2d is shown.

[0073] Through this arrangement, a plurality of rotor core assemblies 2 form a linear stepped skewed-pole rotor structure, which effectively reduces cogging torque and torque fluctuation, and improves the performance and stability of the drive motor.

[0074] In a specific embodiment, the second side wall 114 of the stepped groove 11 is planar and extends along the axial direction of the shaft 1. From the first end to the second end of the shaft 1, the groove width of the multi-segment groove body 111 increases successively. Figure 3 As shown, the second side wall 114 is disposed opposite to the first side wall 113 .

[0075] like Figure 1 As shown, each slot body 111 is roughly in the shape of a rectangular slot, with the left end of the rotating shaft 1 as the first end and the right end of the rotating shaft 1 as the second end. From the first end to the second end of the rotating shaft 1, the multi-section slot body 111 is divided into a first slot body 111a, a second slot body 111b, a third slot body 111c and a fourth slot body 111d in sequence. The slot widths of the first slot body 111a, the second slot body 111b, the third slot body 111c and the fourth slot body 111d increase in sequence, the slot width of the fourth slot body 111d is the largest, and the slot width of the first slot body 111a is the smallest.

[0076] It can be understood that the slot width of each slot body 111 is Figure 3 Linear dimensions in the horizontal direction.

[0077] In this embodiment, one side of the multi-section groove body 111 is flushly arranged to form a planar second side wall 114 . Since the groove widths of the multiple groove bodies 111 are different, a stepped first side wall 113 is formed on the other side of the multi-section groove body 111 .

[0078] Or, optionally, the groove widths of the multiple groove bodies 111 are equal, and the second side wall 114 of the stepped groove 11 is also in a stepped surface shape.

[0079] In a further embodiment, the width of each protruding key 23 is equal to the width of the groove body 111 closest to the first end of the rotating shaft 1 .

[0080] It can be understood that the width of the convex key 23 is Figure 3 Linear dimensions in the horizontal direction.

[0081] That is, the width of each convex key 23 is equal to the slot width of the first slot body 111 a , and the first slot body 111 a can just accommodate the convex key 23 of the first rotor core assembly 2 a .

[0082] Moreover, the slot width of the second slot body 111b is greater than the width of the key 23 of the second rotor core assembly 2b, the slot width of the third slot body 111c is greater than the width of the key 23 of the third rotor core assembly 2c, and the slot width of the fourth slot body 111d is greater than the width of the key 23 of the fourth rotor core assembly 2d.

[0083] This arrangement facilitates the positioning and assembly of the first rotor core assembly 2a and the first slot body 111a, and is conducive to the sequential stacking and press-fitting of other rotor core assemblies 2, which helps to improve assembly efficiency.

[0084] In one embodiment, the plurality of rotor core assemblies 2 are respectively interference fit with the rotating shaft 1 .

[0085] Exemplarily, multiple rotor core assemblies 2 are assembled on the rotating shaft 1 by means of heat assembly, and multiple rotor core assemblies 2 are interference fit with the rotating shaft 1 in the radial direction of the rotating shaft 1, thereby improving the connection strength between the rotor core assembly 2 and the rotating shaft 1.

[0086] Specifically, the rotor core assembly 2 is first heated to a temperature of 80°C to 100°C, and then a manipulator is used to grab the outer diameter of the rotor core 21 and insert it onto the shaft 1. Before the rotor core assembly 2 is cooled, the manipulator exerts an axial force on the rotor core assembly 2 and a circumferential force biased toward the first side wall 113 to ensure that the rotor core assembly 2 is installed in place in the axial and circumferential directions. The rotor core assembly 2 is then quickly cooled by fan cooling or the like, so that the rotor core assembly 2 is fixedly connected to the shaft 1 in the axial and circumferential directions.

[0087] In one embodiment, the motor rotor assembly also includes a first dynamic balancing plate 3 and a second dynamic balancing plate 4, which are sleeved on the rotating shaft 1 and distributed at intervals along the axial direction of the rotating shaft 1, and a plurality of rotor core assemblies 2 are located between the first dynamic balancing plate 3 and the second dynamic balancing plate 4.

[0088] like Figure 6 As shown, the first dynamic balancing plate 3 is closer to the first end (i.e., the left end) of the rotating shaft 1 than the second dynamic balancing plate 4. When assembling the motor rotor assembly, the first dynamic balancing plate 3, the first rotor core assembly 2a, the second rotor core assembly 2b, the third rotor core assembly 2c, the fourth rotor core assembly 2d and the second dynamic balancing plate 4 are assembled on the rotating shaft 1 in sequence.

[0089] Rotor dynamic balance refers to the balance state of the centrifugal force and inertial force exerted on the rotor during the rotation of the motor when the motor is running. Poor rotor dynamic balance will cause the motor to vibrate more, increase the noise, and even affect the service life and safety performance of the motor.

[0090] By setting the first dynamic balancing plate 3 and the second dynamic balancing plate 4, the mass distribution of the motor rotor assembly is adjusted so that the center of mass coincides with the rotation axis, so that the motor rotor assembly achieves dynamic balance during rotation, reduces vibration, and improves the stability of the motor rotor assembly.

[0091] In a further embodiment, the first dynamic balancing plate 3 and the second dynamic balancing plate 4 are respectively transitionally matched with the rotating shaft 1, which has the advantage of high flexibility, and can ensure a certain matching accuracy while taking into account a certain degree of freedom.

[0092] In one embodiment, the first dynamic balancing plate 3 abuts against the shoulder 12 of the rotating shaft 1 ; the motor rotor assembly further includes a pressure ring 5 , which is sleeved on the rotating shaft 1 and abuts against a side of the second dynamic balancing plate 4 away from the first dynamic balancing plate 3 .

[0093] Specifically, the pressing ring 5 is annular. Figure 6 As shown, the first dynamic balancing plate 3 is located on the right side of the shoulder 12 of the rotating shaft 1, and the pressure ring 5 is located on the right side of the second dynamic balancing plate 4. Under the joint action of the shoulder 12 and the pressure ring 5, the first dynamic balancing plate 3, the second dynamic balancing plate 4 and the multiple rotor core assemblies 2 are axially fixed, preventing the first dynamic balancing plate 3, the second dynamic balancing plate 4 and the multiple rotor core assemblies 2 from axial movement.

[0094] Furthermore, the pressing ring 5 and the rotating shaft 1 are interference fit.

[0095] Exemplarily, the pressure ring 5 is assembled on the rotating shaft 1 by heat assembly, and the pressure ring 5 and the rotating shaft 1 are interference fit in the radial direction of the rotating shaft 1, so as to improve the connection strength between the pressure ring 5 and the rotating shaft 1, and fix the first dynamic balancing plate 3, the second dynamic balancing plate 4 and multiple rotor core assemblies 2 axially and circumferentially.

[0096] Exemplarily, the assembly process of the motor rotor assembly provided in the embodiment of the present application includes:

[0097] S1: Assemble the first dynamic balancing plate 3 to the shoulder 12 of the rotating shaft 1 so that the first dynamic balancing plate 3 abuts against the shoulder 12;

[0098] S2: heating the first rotor core assembly 2a to a temperature of 80°C to 100°C, using a manipulator to grab the outer diameter of the first rotor core 21 and insert it onto the shaft 1 to achieve an interference fit between the first rotor core assembly 2a and the shaft 1. Before the first rotor core assembly 2a is cooled, the manipulator exerts an axial force on the first rotor core assembly 2a and a circumferential force biased toward the first side wall 113 to ensure that the first rotor core assembly 2a is installed in place in the axial and circumferential directions.

[0099] S3: In the same manner as S2, the second rotor core assembly 2b, the third rotor core assembly 2c and the fourth rotor core assembly 2d are sequentially sleeved onto the rotating shaft 1. After cooling, the angle between the abutting surface of the second rotor core assembly 2b and the abutting surface of the first rotor core assembly 2a in the circumferential direction of the rotating shaft 1 is θ, the angle between the abutting surface of the third rotor core assembly 2c and the abutting surface of the first rotor core assembly 2a in the circumferential direction of the rotating shaft 1 is 2θ, and the angle between the abutting surface of the fourth rotor core assembly 2d and the abutting surface of the first rotor core assembly 2a in the circumferential direction of the rotating shaft 1 is 3θ;

[0100] S4: insert the second dynamic balancing plate 4 onto the rotating shaft 1, so that the second dynamic balancing plate 4 abuts against the fourth rotor core assembly 2d;

[0101] S5: heating the pressing ring 5 and inserting the pressing ring 5 onto the rotating shaft 1 to achieve interference fit between the pressing ring 5 and the rotating shaft 1 , so that the pressing ring 5 abuts against the second dynamic balancing plate 4 .

[0102] An embodiment of the present application also provides a drive motor, comprising a motor rotor assembly provided by any of the above embodiments.

[0103] In the present application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The term "plurality" refers to two or more than two, unless otherwise clearly defined.

[0104] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the present application disclosed herein. The present application is intended to cover any variations, uses or adaptations of the present application, which follow the general principles of the present application and include common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only.

[0105] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A motor rotor assembly, characterized in that: The motor rotor assembly comprises: A rotating shaft (1) is provided with a stepped groove (11), wherein the stepped groove (11) comprises a plurality of groove bodies (111), wherein the plurality of groove bodies (111) are sequentially connected along the axial direction of the rotating shaft (1), so that a first side wall (113) of the stepped groove (11) is in the shape of a stepped surface; A plurality of rotor core assemblies (2), each of the rotor core assemblies (2) being annular and having an inner ring wall protruding with a convex key (23), the plurality of rotor core assemblies (2) being respectively sleeved on the rotating shaft (1) and arranged along the axial direction of the rotating shaft (1), the plurality of convex keys (23) being inserted into the plurality of sections of the slot body (111) in a one-to-one correspondence, and each of the convex keys (23) being in contact with the first side wall (113).

2. The motor rotor assembly according to claim 1, characterized in that: The included angles between the extension planes of any two adjacent step surfaces (113a) in the first side wall (113) are the same.

3. The motor rotor assembly according to claim 1, characterized in that: The second side wall (114) of the stepped groove (11) is planar and extends along the axial direction of the rotating shaft (1); from the first end to the second end of the rotating shaft (1), the groove widths of the multiple sections of the groove body (111) increase in sequence; Wherein, the second side wall (114) is arranged opposite to the first side wall (113).

4. The motor rotor assembly according to claim 3, characterized in that: The width of each of the convex keys (23) is equal to the width of the groove body (111) closest to the first end of the rotating shaft (1).

5. The motor rotor assembly according to claim 1, characterized in that: The plurality of rotor core assemblies (2) are respectively interference fit with the rotating shaft (1).

6. The motor rotor assembly according to claim 1, characterized in that: The motor rotor assembly further comprises a first dynamic balancing plate (3) and a second dynamic balancing plate (4), wherein the first dynamic balancing plate (3) and the second dynamic balancing plate (4) are sleeved on the rotating shaft (1) and are spaced apart along the axial direction of the rotating shaft (1), and the plurality of rotor core assemblies (2) are located between the first dynamic balancing plate (3) and the second dynamic balancing plate (4).

7. The motor rotor assembly according to claim 6, characterized in that: The first dynamic balancing plate (3) and the second dynamic balancing plate (4) are respectively transitionally matched with the rotating shaft (1).

8. The motor rotor assembly according to claim 6, characterized in that: The first dynamic balancing plate (3) abuts against a shaft shoulder (12) of the rotating shaft (1); The motor rotor assembly further comprises a pressure ring (5), wherein the pressure ring (5) is sleeved on the rotating shaft (1), and the pressure ring (5) abuts against a side of the second dynamic balancing plate (4) which faces away from the first dynamic balancing plate (3).

9. The motor rotor assembly according to claim 8, characterized in that: The pressing ring (5) and the rotating shaft (1) are interference fit.

10. A driving motor, characterized in that: The drive motor comprises the motor rotor assembly according to any one of claims 1 to 9.

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