Rotor assembly, motor and electric drive axle

Abstract

The utility model provides a rotor assembly, a motor and an electric drive bridge, the rotor assembly comprises a rotor body, at least a rotor iron core group is arranged in the rotor body, and winding parts are arranged on two end surfaces of the rotor body; the winding sleeve comprises an axial sleeve layer and a circumferential sleeve layer, the axial sleeve layer is wound on the winding part in a sleeving mode and obliquely reciprocates at the two ends of the rotor body, the circumferential sleeve layer and the axial sleeve layer are arranged in an overlapped mode, and the circumferential sleeve layer is formed by winding along the circumference of the rotor body. According to the scheme, the strength of the rotor assembly can be effectively improved, and the strength requirement for the rotor assembly during high-speed operation of the motor is met.

Description

Technical Field

[0001] This utility model belongs to the field of electric motors, and in particular relates to a rotor assembly, an electric motor, and an electric drive bridge. Background Technology

[0002] For automotive drive motors, increasing the maximum operating speed effectively improves the motor's power density, making it smaller and lighter. Therefore, the maximum operating speed of drive motors is constantly increasing, currently reaching 30,000 rpm. Under high-speed conditions, the rotor experiences greater centrifugal force, making it prone to deformation due to insufficient rigidity. This results in rotor vibration and noise during rotation, severely impacting motor performance. Utility Model Content

[0003] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a rotor assembly, a motor, and an electric drive bridge to solve the above problems.

[0004] To achieve the above and other related objectives, this utility model provides a rotor assembly, comprising:

[0005] The rotor body contains at least one rotor core assembly, and the two end faces of the rotor body are provided with winding portions.

[0006] The winding sleeve includes an axial sleeve layer and a circumferential sleeve layer. The axial sleeve layer is wound around the winding portion and tilted back and forth between the two ends of the rotor body. The circumferential sleeve layer overlaps with the axial sleeve layer and is formed by winding around the circumference of the rotor body.

[0007] Optionally, the axial sleeve and the circumferential sleeve are arranged sequentially along the direction from the inside to the outside;

[0008] or

[0009] The circumferential sleeve and the axial sleeve are arranged sequentially from the inside to the outside.

[0010] Optionally, along the direction from the inside out, the winding sleeve includes multiple layers, in which the axial sleeve layer and the circumferential sleeve layer are alternately arranged.

[0011] Optionally, along the direction from the inside out, the winding sleeve includes multiple layers, wherein at least two adjacent layers are the axial sleeve layers, or at least two adjacent layers are the circumferential sleeve layers.

[0012] Optionally, the rotor core assembly has slanted poles corresponding to each magnetic pole, and the axial sleeve is formed by the fiber tape passing through the winding part and then obliquely traveling back and forth at the slanted pole angle to both ends of the rotor body.

[0013] Optionally, the winding portion is a convex portion disposed between adjacent oblique poles, and a concave portion is formed between the convex portions corresponding to each magnetic pole, and the fiber tape is wrapped around the convex portion.

[0014] Optionally, arc-shaped guide grooves are provided on both ends of the rotor body, and the two ends of the arc-shaped guide grooves are connected to the circumferential surface of the rotor body to form an arc-shaped winding part.

[0015] Optionally, the rotor body further includes:

[0016] A rotating shaft, on which the rotor core assembly is sleeved;

[0017] End plates are disposed at both ends of the rotor core assembly along the axial direction and are used to press the rotor core assembly together. The winding part is disposed on the end plates.

[0018] To achieve the above and other related objectives, this utility model also provides an electric motor, including the rotor assembly described above.

[0019] To achieve the above and other related objectives, this utility model also provides an electric drive bridge, including the aforementioned motor.

[0020] As described above, the rotor assembly, motor, and electric drive bridge of this utility model have the following beneficial effects:

[0021] In this design, the winding section facilitates axial reciprocating inclined winding during axial sleeve winding, allowing for targeted reinforcement of weak points in the rotor core assembly. Furthermore, the axial sleeve not only provides preload force to pull the rotor body inwards but also constrains the outward bulging of weak circumferential areas in the rotor core assembly. The circumferential sleeve wraps around the rotor core assembly circumferentially, limiting overall deformation.

[0022] This solution can effectively improve the strength of the rotor assembly and meet the strength requirements of the rotor assembly when the motor is running at high speed. Attached Figure Description

[0023] Figure 1 This is a front view of the rotor assembly in an embodiment of the present invention.

[0024] Figure 2 This is an isometric view of the axial sleeve winding in an embodiment of this utility model.

[0025] Figure 3 This is a left view of the rotor assembly in an embodiment of the present invention.

[0026] Figure 4 This is a left view of the rotor assembly in another embodiment of the present invention.

[0027] Figure 5 This is a schematic diagram of the fit between the inclined pole and the axial sleeve in an embodiment of this utility model.

[0028] Figure 6 This is a schematic diagram of the fit between the inclined pole and the axial sleeve in another embodiment of the present invention. Detailed Implementation

[0029] The reference numerals in the accompanying drawings include: shaft 1, rotor core assembly 2, permanent magnet 201, straight shaft 202, skew pole 203, end plate 3, reference line 301, winding part 302, arc-shaped guide groove 303, axial sleeve 4, and circumferential sleeve 5.

[0030] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0031] This utility model provides a rotor assembly, such as Figures 1 to 6 As shown.

[0032] In one exemplary embodiment of this application, a rotor assembly is provided, comprising:

[0033] The rotor body has at least one rotor core assembly 2 and winding portions 302 are provided on both ends of the rotor body.

[0034] The winding sleeve includes an axial sleeve layer 4 and a circumferential sleeve layer 5. The axial sleeve layer 4 is wound around the winding part 302 and tilted back and forth between the two ends of the rotor body. The circumferential sleeve layer 5 is overlapped with the axial sleeve layer 4 and is formed by winding along the circumference of the rotor body.

[0035] In this embodiment, the winding portion 302 facilitates axial reciprocating inclined winding of the axial sleeve 4 during winding, thereby providing targeted reinforcement to weak points on the rotor core assembly 2. Furthermore, the axial sleeve 4 not only provides a pre-tightening force to bring the rotor body closer together, but also provides a restraining force to prevent the weak circumferential parts of the rotor core assembly 2 from bulging outwards. The circumferential sleeve 5 wraps around the rotor core assembly circumferentially, limiting overall deformation of the rotor core assembly 2.

[0036] In an exemplary embodiment, the axial sleeve 4 and the circumferential sleeve 5 are sequentially arranged along the direction from the inside to the outside;

[0037] or

[0038] Along the direction from the inside out, the circumferential sleeve 5 and the axial sleeve 4 are set in sequence.

[0039] In this embodiment, the winding sleeve includes at least two layers, namely an axial sleeve layer 4 and a circumferential sleeve layer 5. The order in which the axial sleeve layer 4 and the circumferential sleeve layer 5 are arranged can be set according to requirements.

[0040] In one exemplary embodiment, the winding sleeve includes multiple layers along the direction from the inside to the outside, with axial sleeve 4 and circumferential sleeve 5 alternately arranged in the multiple layers.

[0041] In this embodiment, in order to enhance the constraint effect of the rotor body, the winding sleeve can be composed of multiple layers. Among the multiple layers, the number of axial sleeve layers 4 and circumferential sleeve layers 5 is the same, and a layer of circumferential sleeve layer 5 is set after a layer of axial sleeve layer 4 to meet the stiffness requirements of the rotor assembly.

[0042] In an exemplary embodiment, the winding sleeve includes multiple layers along the direction from the inside to the outside, wherein at least two adjacent layers are axial sleeve layers 4, or at least two adjacent layers are circumferential sleeve layers 5.

[0043] For example, the spiral sleeve can consist of three layers, with the innermost layer being the circumferential sleeve 5, and the middle and outermost layers being the axial sleeve 4.

[0044] For example, the spiral sleeve can consist of three layers, with the innermost layer being the axial sleeve 4, and the middle and outermost layers being the circumferential sleeve 5.

[0045] For example, the spiral sleeve can consist of four layers, with the innermost and outermost layers being axial sleeves 4, and the two middle layers being circumferential sleeves 5.

[0046] For example, the spiral sleeve can consist of four layers, with the innermost and outermost layers being circumferential layers 5, and the two middle layers being axial layers 4.

[0047] In this embodiment, the winding sleeve can be composed of multiple layers, and adjacent layers can both be axial sleeve layers 4 or both be circumferential sleeve layers 5 to meet the requirements.

[0048] In an exemplary embodiment, the rotor core assembly 2 has slanted poles 203 corresponding to each magnetic pole, and the axial sleeve 4 is formed by a fiber strip that wraps around the winding part 302 and then obliquely travels back and forth at the inclination angle of the slanted poles 203 to both ends of the rotor body.

[0049] It should be noted that the slanted pole 203 is a weak point in the rotor core assembly 2, and bulging and other issues are prone to occur during high-speed motor operation, causing abnormal motor operation. Therefore, fiber tape is wound along the slanted pole 203 to achieve targeted reinforcement of the weak point.

[0050] It should also be noted that the fiber tape can be a single strip with a certain width, or it can be a strip formed by multiple limiting wire bundles arranged side by side.

[0051] In this embodiment, the use of fiber tape winding not only reduces the contact stress between the fiber and the surface of the rotor core assembly 2 during winding, but also allows for higher winding tension compared to a single fiber bundle, thereby increasing the prestress within the rotor core after winding. Furthermore, each turn of winding covers an area equal to the width of the fiber tape, effectively improving winding efficiency and reducing production costs.

[0052] For example, the fiber tape is arranged around the rotor body twice to form a cross structure, which covers the slanted pole 203.

[0053] For example, the ends of the rotor body are referred to as end A and end B, respectively. End A and end B are respectively provided with winding portions 302. The winding portions 302 at end A and the winding portions 302 at end B correspond one-to-one to form winding portion 302 combinations. The line connecting each winding portion 302 combination (referred to as reference line 301) is parallel to the axis of the rotor body. There is a magnetic pole between two adjacent winding portion 302 combinations. The slant pole 203 and the reference line 301 form a fixed angle α, where 0° < α < 90°.

[0054] For example, the fiber tape starts from the first winding portion 302 (denoted as A1) at end A, winds at a fixed angle α to the second winding portion 302 (denoted as B2) at end B, then wraps around the second winding portion 302 at end B, and returns to the third winding portion 302 (denoted as A3) at end A at a fixed angle α. This process is repeated sequentially around both ends of the rotor body until it completes one full rotation (denoted as the first rotation). After completing one rotation, the fiber tape starts from the first winding portion 302 (denoted as B1) at end B, winds at a fixed angle α to the second winding portion 302 (denoted as A2) at end A, and then returns to the third winding portion 302 (denoted as B3) at end B at a fixed angle α. This process is repeated sequentially around both ends of the rotor body until it completes one full rotation (denoted as the second rotation). Through the first and second rotations, the fiber tape forms an X-shaped cross structure on the circumferential surface of the rotor body. This cross structure can cover the straight inclined pole 203 in the first or second rotation.

[0055] like Figure 3 As shown, in an exemplary embodiment, the winding portion 302 is a convex portion disposed between adjacent inclined poles 203, and a concave portion is formed between the convex portions corresponding to each magnetic pole, and the fiber tape is wrapped around the convex portion.

[0056] For example, the protrusion is disposed between two adjacent magnetic pole axes (referred to as straight shaft 202), the straight shaft 202 is located in the recess, the fiber belt passes around the protrusion and enters the circumferential surface of the rotor body from the recess, and then obliquely along the inclined pole 203 to the winding portion 302 at the other end of the rotor body.

[0057] like Figure 4As shown, in an exemplary embodiment, arc-shaped guide grooves 303 are provided on both ends of the rotor body. The two ends of the arc-shaped guide grooves 303 are connected to the circumferential surface of the rotor body to form an arc-shaped winding portion 302.

[0058] In this embodiment, the curvature of the arc-shaped guide groove 303 needs to match the setting of the inclined pole 203 to ensure that the fiber tape can cover the inclined pole 203 after being wound along the arc-shaped guide groove 303.

[0059] In one exemplary embodiment, the rotor body further includes:

[0060] Rotor shaft 1, rotor core assembly 2 is sleeved on rotor shaft 1;

[0061] End plates 3 are disposed at both ends of the rotor core assembly 2 along the axial direction and are used to press the rotor core assembly 2. The winding part 302 is disposed on the end plates 3.

[0062] For example, the rotor core assembly 2 includes multiple overlapping rotor cores, each rotor core having a magnetic slot, and each magnetic slot having a permanent magnet 201.

[0063] In this embodiment, the rotor core assembly 2 is pressed and limited by the end plate 3, and the winding part 302 is set on the end plate 3, so that the axial sleeve layer 4 forms an axial preload and a radial constraint force on the rotor core.

[0064] In one exemplary embodiment of this application, an electric motor is also provided, comprising the aforementioned rotor assembly.

[0065] In this embodiment, a winding sleeve is provided on the rotor assembly to enhance the rigidity of the rotor assembly and meet the requirements of high-speed motor operation.

[0066] In one exemplary embodiment of this application, an electric drive bridge is also provided, including the motor described above.

[0067] In this embodiment, the electric drive bridge includes the aforementioned motor to improve its operating performance.

[0068] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A rotor assembly characterized by, include: The rotor body contains at least one rotor core assembly, and the two end faces of the rotor body are provided with winding portions. The winding sleeve includes an axial sleeve layer and a circumferential sleeve layer. The axial sleeve layer is wound around the winding portion and tilted back and forth between the two ends of the rotor body. The circumferential sleeve layer overlaps with the axial sleeve layer and is formed by winding around the circumference of the rotor body.

2. The rotor assembly of claim 1, wherein The axial sleeve and the circumferential sleeve are arranged sequentially from the inside to the outside. or The circumferential sleeve and the axial sleeve are arranged sequentially from the inside to the outside.

3. The rotor assembly of claim 1, wherein Along the direction from the inside out, the winding sleeve includes multiple layers, in which the axial sleeve layer and the circumferential sleeve layer are alternately arranged.

4. The rotor assembly of claim 1, wherein Along the direction from the inside out, the winding sleeve includes multiple layers, of which at least two adjacent layers are the axial sleeve layers, or at least two adjacent layers are the circumferential sleeve layers.

5. The rotor assembly of any one of claims 1-4, wherein, The rotor core assembly has skewed poles corresponding to each magnetic pole, and the axial sleeve is formed by the fiber belt passing through the winding part and then obliquely traveling back and forth at the inclination angle of the skewed poles to both ends of the rotor body.

6. The rotor assembly of claim 5, wherein The winding portion is a convex portion disposed between adjacent oblique poles, and a concave portion is formed between the convex portions corresponding to each magnetic pole, and the fiber tape is wrapped around the convex portion.

7. The rotor assembly of claim 5, wherein The rotor body has arc-shaped guide grooves on both ends, and the two ends of the arc-shaped guide grooves are connected to the circumferential surface of the rotor body to form an arc-shaped winding part.

8. The rotor assembly of claim 5, wherein, The rotor body also includes: A rotating shaft, on which the rotor core assembly is sleeved; End plates are disposed at both ends of the rotor core assembly along the axial direction and are used to press the rotor core assembly together. The winding part is disposed on the end plates.

9. An electric machine characterized by Includes the rotor assembly as described in any one of claims 1 to 8.

10. An electric drive axle, characterized in that Includes the motor as described in claim 9.

Images