Motor rotor assembly, motor and automobile

Abstract

The utility model discloses a motor rotor assembly, a motor and an automobile. The motor rotor assembly comprises a motor shaft and a rotor iron core, wherein the motor shaft is arranged in the rotor iron core; the plurality of magnetic steels are arranged in the grooves in the outer surface of the rotor iron core; the motor rotor assembly further comprises at least two bonding end plates which are arranged at the two ends of the motor rotor assembly respectively. And the rotor sheath is wrapped on the outer surface of the motor rotor assembly. According to the motor rotor assembly, the torque ripple and the rotational inertia of the motor used by the active suspension system can be reduced, the anti-disturbance performance and the response speed of the motor are improved, and the stability and the control stability of the motor are improved.

Description

Technical Field

[0001] This application relates to the technical field of new energy vehicles, and particularly to a motor rotor assembly, a motor, and an automobile. Background Art

[0002] In the field of automobiles, an active suspension system can effectively reduce vibrations and impacts during vehicle driving, improve the driving safety and stability of new energy vehicles, and meet the high demands of the current new energy vehicle industry for maneuverability.

[0003] Existing methods for improving the performance of the suspension system include optimizing the system control algorithm, reducing the friction of the transmission system, adding damping structures, optimizing the performance of actuators, etc.

[0004] Each research institution suppresses and compensates for the system torque ripple by introducing different control algorithms, but this method has a high dependence on parameter adjustment and requires repeated iteration in specific engineering applications, consuming a large amount of time and energy. From a specific implementation perspective, reducing the friction of the transmission system and adding damping structures require additional new processing technologies or damping structures, which is not conducive to maintaining the manufacturing cost.

[0005] It should be noted that the statements here only provide background information related to this application and do not necessarily constitute prior art. Summary of the Utility Model

[0006] In view of the above problems, this application proposes a motor rotor assembly, a motor, and an automobile that overcome the above problems or at least partially solve the above problems.

[0007] The embodiments of this application adopt the following technical solutions:

[0008] In a first aspect, the embodiments of this application provide a motor rotor assembly, which includes: a motor shaft and a rotor core, the motor shaft is disposed inside the rotor core; a plurality of permanent magnets, the plurality of permanent magnets are disposed in the outer surface grooves of the rotor core; further includes: at least two bonding end plates, at least two of the bonding end plates are respectively disposed at both ends of the motor rotor assembly; and a rotor sheath, the rotor sheath wraps around the outer surface of the motor rotor assembly.

[0009] Preferably, the permanent magnets adopt a fan-shaped structure, wherein the outer arc surface axis of the fan-shaped structure is not coaxial with the inner arc surface axis; the permanent magnets include an equal number of N-pole permanent magnets and S-pole permanent magnets.

[0010] Preferably, at least one end of the motor shaft includes a riveting structure for axially fixing the motor rotor assembly.

[0011] Preferably, on the rotor core, a groove is provided that cooperates with the turning and riveting structure. The bonding end plate adopts a lightweight structure and includes an annular sheet metal part.

[0012] Preferably, the rotor core adopts a lightweight structure and / or a material with a small moment of inertia.

[0013] In a second aspect, an embodiment of the present application further provides a motor for an active suspension system, including the motor rotor assembly according to any one of the first aspects.

[0014] In a third aspect, an embodiment of the present application further provides a vehicle, including at least one motor as described in the second aspect.

[0015] The above at least one technical solution adopted in the embodiment of the present application can achieve the following beneficial effects:

[0016] The motor rotor assembly in the present application can reduce the torque fluctuation and moment of inertia of the motor for the active suspension system, improve the anti-disturbance performance and response speed of the motor, and solve the problems of poor stability and difficult control of the motor for the active suspension system; at the same time, the motor rotor assembly in the present application has a simple structure, low requirements for manufacturing materials, and strong practicality and engineering application value.

[0017] The above description of the technical solution of the present application is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the following specifically illustrates the specific implementation manners of the present application. Description of the Drawings

[0018] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0019] Figure 1 is a schematic structural diagram of the motor rotor assembly in the embodiment of the present application;

[0020] Figure 2 is a cross-sectional view of the motor rotor assembly in the embodiment of the present application;

[0021] Figure 3 is a schematic diagram of the magnet core combination in the embodiment of the present application;

[0022] Figure 4 is a partially enlarged view of the magnet core combination in the embodiment of the present application;

[0023] Figure 5Schematic diagram of the magnet distribution in the embodiments of the present application;

[0024] Figure 6 Schematic diagram of the bonded end plate structure in the embodiments of the present application;

[0025] Figure 7 Schematic diagram of the flanging and riveting structure in the embodiments of the present application (before flanging and riveting);

[0026] Figure 8 Schematic diagram of the flanging and riveting structure in the embodiments of the present application (after flanging and riveting);

[0027] Figure 9 Torque fluctuation comparison chart in the embodiments of the present application.

[0028] In the figure, 1 - motor shaft; 2 - bonded end plate; 3 - rotor sheath; 4 - N - pole magnet; 5 - S - pole magnet; 6 - rotor iron core; 7 - flanging and riveting structure. Detailed implementation manners

[0029] To make the objectives, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be clearly and completely described below in conjunction with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the protection scope of the present application.

[0030] The concept of the present application lies in that, aiming at the current situation of large torque fluctuation and large moment of inertia in the motor control process of the prior art, which affect the motor control, a motor rotor assembly with strong universality is designed. This motor rotor assembly can reduce the torque fluctuation and moment of inertia of the motor used in the active suspension system, improve the anti - disturbance performance and response speed of the motor, and improve the operation stability and control stability of the motor.

[0031] The following will detail the technical solutions provided by each embodiment of the present application in conjunction with the drawings.

[0032] The applicant found through investigation and research that the main reasons for large motor torque fluctuation mainly include two aspects: electrical characteristics and mechanical structure.

[0033] Almost all methods suppress and compensate the system torque fluctuation by introducing different control algorithms, but this method has a high dependence on parameter adjustment and requires repeated iteration in specific engineering applications, consuming a large amount of time and energy.

[0034] The present application reduces the motor torque fluctuation by improving the mechanical structure of the motor.

[0035] The embodiments of the present application provide a motor rotor assembly, a motor and an automobile. AsFigure 1 , 2 As shown, a schematic diagram of the motor rotor assembly in the embodiment of the present application is provided. The motor rotor assembly includes a motor shaft 1 and a rotor core 6. The motor shaft 1 is disposed inside the rotor core 6; and a plurality of magnetic steel blocks, the plurality of magnetic steel blocks are disposed in the outer surface grooves of the rotor core; it also includes at least two bonding end plates 2, at least two of the bonding end plates 2 are respectively disposed at both ends of the motor rotor assembly; and a rotor sheath 3, the rotor sheath 3 wraps around the outer surface of the motor rotor assembly.

[0036] As Figure 3 , 4 shown, in the present application, the magnetic steel block is a magnetic steel block, and its specific shape is a sector structure, that is, it is formed by axially cutting a ring column with a certain height. In the present application, the outer arc surface axis and the inner arc surface axis of the sector structure are not coaxial, that is, from Figure 4 the enlarged cross-sectional view shown, the upper and lower arcs of the magnetic steel are not concentric, mainly to improve the air-gap magnetic density waveform of the motor. Since the shape of the magnetic steel affects the air-gap magnetic density waveform, for magnetic steel with equal thickness, due to the uniform air gap of the motor, the air-gap magnetic density distribution is uniform. Figure 3 , Figure 4 In, a groove is provided in the inner ring of the iron core for installation and positioning. The present application uses magnetic steel with unequal thickness. Since the air gap in the middle part of the magnetic steel with unequal thickness is small and the air gap at both ends is large, the maximum value appears in the middle of the magnetic steel in the overall distribution. By improving the waveform of the air-gap magnetic density, the torque ripple of the motor is reduced. As Figure 9 shown, by comparing before (left figure) and after (right figure) the optimization of the torque ripple, it can be seen that the torque ripple is significantly reduced.

[0037] In the present application, the magnetic steel includes an N-pole magnetic steel 4 and an S-pole magnetic steel 5, and the number of N-pole magnetic steel 4 and S-pole magnetic steel 5 is equal; as Figure 3 , 5 shown, longitudinally, the N-pole magnetic steel 4 and the S-pole magnetic steel 5 are alternately arranged on the outer surface of the rotor core, and transversely, the N-pole magnetic steel 4 and the S-pole magnetic steel 5 are adjacent to each other. As Figure 5 shown, in the present application, it is disposed in the corresponding grooves on the outer surface of the rotor core. Specifically, the magnetic steel and the groove can be set as a mortise and tenon structure, or can be fixed by pasting, and on the outer surfaces of all the magnetic steel, radial fixation is performed through the rotor sheath 3.

[0038] In some examples of the present application, at least one end of the motor shaft 1 includes a flanging structure 7. After the rotor assembly is assembled, by flanging the flanging structure 7, the motor rotor assembly is axially fixed. Referring to a specific embodiment in the present application, a flanging structure is reserved at the motor shaft end, as Figure 7As shown, one end of the riveting structure is machined with evenly distributed grooves along the circumferential direction to form the structural clamping part of the riveting structure. After the rotor assembly is assembled, the riveting is carried out by using the riveting tooling and the press to achieve Figure 8 the shown effect, which means the riveting is completed. This riveting scheme is used for the axial fixation of the rotor assembly. The riveting structure replaces the design of the interference ring or the locking nut, reduces the rotor weight, and decreases the moment of inertia.

[0039] As Figure 6 shown, the bonding end plates 2 in this application are respectively assembled at both ends of the machine rotor assembly, replacing the previous relatively heavy balance end plates for axial limit, while reducing the rotor weight and optimizing the moment of inertia. The bonding end plate includes an annular sheet metal part.

[0040] In some examples of this application, the bonding end plate 2 adopts a lightweight structure. In this application, a stainless steel plate with a thickness of 0.5 mm is used, which is also used to isolate the iron filings generated by dynamic balance weight removal, protect the magnetic steel, further reduce the rotor weight, and optimize the moment of inertia.

[0041] In some examples of this application, the rotor core 6 and the motor shaft 1 are optimized. A lightweight structure is adopted, or a material with a small moment of inertia is used. For example, the inner diameter of the rotor core is made to the preset maximum value to reduce the structural weight, and the motor shaft 1 is made into a hollow shaft to minimize the weight of the effective materials of the rotor and optimize the moment of inertia. On the basis of meeting the performance, the weight of the effective materials of the rotor is minimized to optimize the moment of inertia.

[0042] The embodiment of this application also provides a motor for an active suspension system, including the motor rotor assembly as described above. For other parts of the motor, reference can be made to the prior art, which will not be elaborated in this application.

[0043] The embodiment of this application also provides an active suspension system and an automobile, including the motor as described above. For other parts of the active suspension system and the automobile, reference can be made to the prior art, which will not be elaborated in this application.

[0044] It should be noted that in the description of this application, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of this application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0045] In this application, unless otherwise clearly specified or limited, terms such as "installed", "connected", "coupled", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or capable of communicating with each other; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0046] In this application, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0047] Any process or method description shown in a flowchart or described in other ways herein may be understood to represent a module, segment, or portion of code including one or more executable instructions for implementing a specific logical function or process. And the scope of the preferred embodiments of this application includes additional implementations, where the functions may be executed in a manner that is not shown or discussed in the order, including in a substantially simultaneous manner according to the involved functions or in the reverse order, which should be understood by those skilled in the technical field to which the embodiments of this application belong.

[0048] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.

[0049] Although the embodiments of this application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting this application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.

Claims

1. A motor rotor assembly, characterized in that: The motor rotor assembly comprises: A motor shaft and a rotor core, wherein the motor shaft is disposed inside the rotor core; A plurality of magnetic steels, wherein the plurality of magnetic steels are arranged in grooves on the outer surface of the rotor core; Also includes: At least two bonding end plates, wherein at least two bonding end plates are respectively arranged at two ends of the motor rotor assembly; And a rotor sleeve, wherein the rotor sleeve is wrapped around the outer surface of the motor rotor assembly.

2. The motor rotor assembly according to claim 1, characterized in that: The magnetic steel adopts a fan-shaped structure, wherein the outer ring arc surface axis and the inner ring arc surface axis of the fan-shaped structure are not coaxial; the magnetic steel includes an equal number of N-pole magnetic steel and S-pole magnetic steel.

3. The motor rotor assembly according to claim 1, characterized in that: At least one end of the motor shaft includes a rivet structure for fixing the motor rotor assembly in the axial direction.

4. The motor rotor assembly according to claim 3, characterized in that: A groove cooperating with the riveting structure is provided on the rotor core.

5. The motor rotor assembly according to claim 1, characterized in that: The adhesive end plate comprises an annular piece of sheet metal.

6. The motor rotor assembly according to claim 1, characterized in that: The rotor core adopts a lightweight structure.

7. The motor rotor assembly according to claim 1, characterized in that: The rotor core is made of a material with small moment of inertia.

8. The motor rotor assembly according to claim 1, characterized in that: The bonding end plate adopts a lightweight structure.

9. A motor for an active suspension system, characterized in that: Comprising a motor rotor assembly as claimed in any one of claims 1-8.

10. An automobile, characterized in that: Comprising at least one motor as claimed in claim 9.

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