Rotor structure and motor

Abstract

The utility model discloses a rotor structure and a motor, and the rotor structure comprises a first rotating shaft which comprises a connecting part; the second rotating shaft is connected with the connecting part; the multiple laminations are arranged on the second rotating shaft in a sleeving manner in the circumferential direction; the first end cover is arranged between the connecting part and the lamination in the axial direction, and the first end cover and the lamination abut against each other in the axial direction; the connecting part surrounds the periphery of the second rotating shaft in the circumferential direction, and the connecting part is in interference fit with the second rotating shaft in the radial direction. According to the utility model, the number of parts of the rotor assembly is reduced, the lightweight design is realized, and the production cost of the motor is reduced on the premise of ensuring that the laminations can be pressed tightly without introducing a lock ring.

Description

Technical Field

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

[0002] In the design and manufacturing process of electric motors, lamination technology is usually used to reduce hysteresis loss and eddy current loss, thereby ensuring that the motor has good performance and reliability.

[0003] In vehicle electric drive systems, the electric motor, electronic control system, and reducer are integrated into a single unit, often referred to as a "three-in-one" design. During vehicle operation, this integrated system can reach temperatures of up to 160°C. At this temperature, the laminations expand axially due to heat, affecting the motor's performance and reliability, and potentially leading to design and assembly failures, posing significant safety hazards. Therefore, locking rings are used to axially compress the rotor laminations. However, introducing locking rings and other components increases the number of parts in the motor rotor assembly, hindering lightweight rotor design and increasing production costs to some extent. Utility Model Content

[0004] The purpose of this invention is to solve the problem that the rotor assembly of an existing motor has many components, which is not conducive to lightweight design. This invention provides a rotor structure that eliminates the need for locking rings, reduces the number of components in the rotor assembly while ensuring that the laminated laminations can be pressed together, thereby achieving lightweight design and reducing the production cost of the motor.

[0005] To solve the above-mentioned technical problems, an embodiment of this utility model discloses a rotor structure, comprising:

[0006] The first rotating shaft includes a connecting part;

[0007] The second rotating shaft is connected to the connecting part;

[0008] Multiple stacked pieces are circumferentially sleeved on the second rotating shaft;

[0009] A first end cap, along the axial direction, is disposed between the connecting portion and the plurality of stacked pieces, and abuts against each other along the axial direction;

[0010] Along the circumferential direction, the connecting portion is disposed around the periphery of the second rotating shaft, and along the radial direction, the connecting portion and the second rotating shaft are interference-fitted.

[0011] Using the above technical solution, the connecting part of the first rotating shaft abuts against the first end cover in the axial direction and is interference-fitted with the second rotating shaft in the radial direction. Simultaneously, the first end cover also abuts against the laminated plates in the axial direction. Without the need for other components (such as locking rings), the axial clamping force provided by the interference fit can securely connect the first and second rotating shafts, and also clamp the laminated plates in the axial direction. Since the first and second rotating shafts can achieve a secure connection without introducing other components, and there is no need to consider the processing technology of connecting other components to the shaft, it is beneficial for the lightweight design of the rotor and the reduction of production costs.

[0012] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a rotor structure in which the first rotating shaft and the second rotating shaft are not connected by a locking ring.

[0013] By adopting the above technical solution, since the first and second shafts are not connected by a locking ring, at least 190 grams of weight can be saved. Furthermore, there is no need to consider the processing technology when the locking ring is connected to the shaft, which is beneficial for the lightweight design of the rotor and the reduction of production costs.

[0014] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a rotor structure in which, along the radial direction, the first rotating shaft includes a first protrusion, one end of the first protrusion is connected to the connecting portion, and along the axial direction, the first protrusion abuts against one end of the second rotating shaft.

[0015] By adopting the above technical solution, the first protrusion abuts against one end of the second rotating shaft, which can restrict the second rotating shaft from moving axially, making the connection between the first rotating shaft and the second rotating shaft more stable.

[0016] According to another specific embodiment of the present invention, the present invention discloses a rotor structure, wherein the connecting part includes a first part and a second part. Along the axial direction, one end of the first part is connected to the first protrusion, and the other end is connected to the second part. The second part abuts against the first end cover. Along the radial direction, the first part is interference-fitted with the second rotating shaft. The diameter of the second part is not less than the diameter of the first part.

[0017] By adopting the above technical solution, along the axial direction, one end of the first part is connected to the first protrusion, and the other end is connected to the second part. Furthermore, the first part is interference-fitted with the second rotating shaft, and the second part abuts against the first end cover, which can further improve the stability between the first rotating shaft, the second rotating shaft, and the first end cover, and prevent assembly failure.

[0018] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a rotor structure including a second end cover, the second end cover being sleeved on the second rotating shaft along the circumferential direction, and along the axial direction, the second end cover abutting against the plurality of stacked plates, the plurality of stacked plates being located between the first end cover and the second end cover.

[0019] By adopting the above technical solution, the second end cap abuts against the stacked plate along the axial direction, and the stacked plate is located between the first end cap and the second end cap, which can further improve the stability of the stacked plate in the axial direction. Even if the stacked plate expands due to heat, it will not move relative to the second rotating shaft and the first rotating shaft in the axial direction.

[0020] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a rotor structure in which the second rotating shaft includes a second protrusion along the radial direction, and the second end cap is located between the laminate and the second protrusion along the axial direction and abuts against each other along the axial direction.

[0021] The present invention also discloses an electric motor, which includes at least one rotor structure from any of the above embodiments. Attached Figure Description

[0022] Figure 1 Schematic diagrams of the rotor structure of the motor are shown in some embodiments.

[0023] Figure 2 A three-dimensional schematic diagram of a rotor structure provided in an embodiment of this application is shown.

[0024] Figure 3 A perspective sectional view of a rotor structure provided in an embodiment of this application is shown.

[0025] Figure 4 A partially enlarged schematic diagram of a rotor structure provided in an embodiment of this application is shown.

[0026] Figure 5 A front view of the first shaft of a rotor structure provided in an embodiment of this application is shown.

[0027] Figure 6 A three-dimensional schematic diagram of the first shaft of a rotor structure provided in an embodiment of this application is shown.

[0028] Figure 7 A perspective view of the second shaft of a rotor structure provided in an embodiment of this application is shown. Detailed Implementation

[0029] 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. Although the description of this utility model will be presented in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to this embodiment. On the contrary, the purpose of describing the utility model in conjunction with the embodiments is to cover other options or modifications that may be derived based on the claims of this utility model. To provide a deep understanding of this utility model, many specific details will be included in the following description. This utility model may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this utility model, some specific details will be omitted in the description. It should be noted that, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0030] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0031] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the utility model.

[0032] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0033] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0034] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0035] Lightweight design is a key focus in the development of new energy vehicles, significantly impacting their performance and production costs. For example, lightweight rotors offer at least the following advantages:

[0036] ① Reducing the weight of the rotor reduces the energy required for its rotation, which may extend the driving range and minimize energy consumption, thereby improving range and efficiency;

[0037] ② A lighter rotor allows the motor to rotate faster, thereby increasing the potential power output.

[0038] See Figure 1 , Figure 1 The diagram illustrates a rotor structure for an electric motor, comprising an integral shaft 10, laminations 11, and a locking ring 12. The laminations 11 and the locking ring 12 are circumferentially fitted around the integral shaft 10. The locking ring 12 and the laminations 11 abut against each other in the axial direction X. Due to limitations such as the material and volume of the locking ring 12, even if the locking ring 12 and the integral shaft 10 are interference-fitted, the locking ring 12 may fail to lock due to the thermal expansion of the laminations 11 at high temperatures. Therefore, the locking ring 12 and the integral shaft 10 are connected by a snap-fit ​​protrusion 121 and a snap-fit ​​recess 101 to restrict the laminations 11 from moving relative to the integral shaft 10 in the axial direction X due to heat.

[0039] The aforementioned technical solution introduces a locking ring 12, and requires engaging protrusions 121 and engaging recesses 101 on the locking ring 12 and the integrated shaft 10. On the one hand, too many components increase the weight of the rotor structure. For example, in motor manufacturing, the existing locking ring 12 typically weighs at least approximately 190 grams, which is detrimental to lightweight rotor design and cost reduction. On the other hand, the increased complexity of the manufacturing process also increases the rotor's production cost.

[0040] Based on this, see Figure 2 , Figure 3 , Figure 4 In some embodiments, this application provides a rotor structure including a first rotating shaft 20, a second rotating shaft 21, a plurality of laminated plates 22, and a first end cap 23. The second rotating shaft 21 has a longer length in the axial direction X than the first rotating shaft 20 in the axial direction X. The first rotating shaft 20 also includes a connecting portion 201, the second rotating shaft 21 and the connecting portion 201 are connected, and the plurality of laminated plates 22 are sleeved on the second rotating shaft 21 circumferentially R. Along the axial direction X, the first end cap 23 is disposed between the connecting portion 201 and the plurality of laminated plates 22, and abuts against each other along the axial direction X. Along the circumferential direction R, the first end cap 23 is sleeved around the periphery of the second rotating shaft 21, and the connecting portion 201 is disposed around the periphery of the second rotating shaft 21. Along the radial direction Y, the connecting portion 201 and the second rotating shaft 21 are interference-fitted, and the first rotating shaft 20 and the second rotating shaft 21 are not connected by a locking ring.

[0041] For example, multiple laminations 22 refer to the structure of dividing the rotor's core or coils into multiple thin plates and then stacking these thin plates together to form the rotor, which can improve the efficiency of the motor, reduce noise and vibration, and achieve a lightweight and compact design.

[0042] Using the above technical solution, the connecting part 201 of the first rotating shaft 20 abuts against the first end cover 23 in the axial direction X and is interference-fitted with the second rotating shaft 21 in the radial direction Y. At the same time, the first end cover 23 also abuts against multiple stacked plates 22 in the axial direction X. Without setting a locking ring, the first rotating shaft 20 and the second rotating shaft 21 can be firmly connected by the axial X clamping force provided by the interference fit, and the multiple stacked plates 22 can be pressed in the axial direction X. Since the first rotating shaft 20 and the second rotating shaft 21 are not connected by a locking ring, at least about 190 grams of weight can be saved, and there is no need to consider the processing technology when the locking ring is connected to the shaft, which is beneficial to the lightweight design of the rotor and the reduction of production costs.

[0043] In some embodiments, see Figure 3 , Figure 4 , Figure 6 Along the radial direction Y, the first rotating shaft 20 includes a first protrusion 202, which protrudes radially Y and is connected at one end to the connecting portion 201. Along the axial direction X, the first protrusion 202 abuts against one end of the second rotating shaft 21. Exemplarily, along the circumferential direction R, the second rotating shaft 21 includes a first end 211 and a second end 212, with the first end 211 abutting against the first protrusion 202.

[0044] In some embodiments, the first shaft 20 includes a plurality of first shoulders 203 for connection to other loads. The second end 212 of the second shaft 21 includes a plurality of second shoulders 2121 for connection to a power source (e.g., an electric motor). The power source of the motor transmits torque to the load sequentially through the second shaft 21 and the first shaft 20. It is understood that the embodiments of this application do not limit the number of first shoulders 203 of the first shaft 20, for example, it can be 1, 2, 3, 4, 5, 6, etc.

[0045] In some embodiments, both the first rotating shaft 20 and the second rotating shaft 21 are hollow shafts for introducing cooling oil or lubricating oil. For example, the second rotating shaft 21 has multiple oil holes 2111, which, under centrifugal force, are used to fling out the cooling oil or lubricating oil.

[0046] In some embodiments, see Figure 3 , Figure 4 , Figure 5The connecting portion 201 includes a first portion 2011 and a second portion 2012. Along the axial direction X, one end of the first portion 2011 is connected to a first protrusion 202, and the other end is connected to the second portion 2012. The second portion 2012 abuts against a first end cap 23. Along the radial direction Y, the first portion 2011 is press-fitted with a second rotating shaft 21. The diameter of the second portion 2012 is not less than the diameter of the first portion 2011. Exemplarily, the first portion 2011 has a first diameter d1, and the second portion 2012 has a second diameter d2, which is not less than the first diameter d1. Exemplarily, the second diameter d2 is greater than the first diameter d1. Exemplarily, both the first portion 2011 and the second portion 2012 are hollow cylinders.

[0047] In some embodiments, the first portion 2011 includes a first interference surface 20111, and the second shaft 21 includes a second interference surface 210. The first interference surface 20111 and the second interference surface 210 are interference-fitted to provide axial clamping force. In this embodiment, the interference fit refers to utilizing the elasticity of the first shaft 20 to deform the first portion 2011 and fit it onto the second shaft 21. When the first portion 2011 returns to its original position, it generates a clamping force on the second shaft 21 in the radial Y direction, connecting the first shaft 20 and the second shaft 21. This connection can be achieved without additional adhesives or mechanical fasteners, ensuring a secure connection between the first shaft 20 and the second shaft 21.

[0048] It is understood that the embodiments of this application do not limit the amount of interference between the first interference surface 20111 and the second interference surface 210, for example, it can be a value such as 0.01mm, 0.02mm, 0.03mm, 0.04mm, 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm, 0.5mm, 1mm, etc.

[0049] In some embodiments, see Figure 2 , Figure 3 , Figure 4 and combined Figure 7 The rotor structure includes a second end cover 24, which is sleeved on the second rotating shaft 21 along the circumferential direction R. Along the axial direction X, the second end cover 24 abuts against a plurality of laminated plates 22, which are located between the first end cover 23 and the second end cover 24. Exemplarily, along the axial direction X, the first end cover 23 and the second end cover 24 are spaced apart at both ends of the second rotating shaft 21. The first end cover 23 is located at the first end 211 of the second rotating shaft 21, and the second end cover 24 is located at the second end 212 of the second rotating shaft 21, for pressing the plurality of laminated plates 22 together with the first end cover 23.

[0050] In some embodiments, the second shaft 21 includes a second protrusion 213 along the radial direction Y, and a second end cap 24 is located between the plurality of stacked pieces 22 and the second protrusion 213 along the axial direction X, and abuts against each other along the axial direction X. Exemplarily, the second protrusion 213 is provided to protrude along the radial direction Y.

[0051] Understandably, in some embodiments, an abutment member may be added between the second portion 2012 and the first end cap 23 along the axial direction X. For example, the second rotating shaft 21 may also include a third protrusion (not shown in the figure), which is disposed between the second portion 2012 and the first end cap 23 along the axial direction X and abuts against each other. Although the above solution makes the processing technology of the second rotating shaft 21 more complex and the processing cost higher, it still falls within the protection scope of this application.

[0052] This application also provides an electric motor, which includes at least one rotor structure from any of the foregoing embodiments.

[0053] Although the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the present invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the present invention to these descriptions. Those skilled in the art can make various changes in form and detail, including some simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A rotor structure, characterized in that, include: The first rotating shaft includes a connecting part; The second rotating shaft is connected to the connecting part; Multiple stacked pieces are circumferentially sleeved on the second rotating shaft; A first end cap, along the axial direction, is disposed between the connecting portion and the plurality of stacked pieces, and abuts against each other along the axial direction; Along the circumferential direction, the connecting portion is disposed around the periphery of the second rotating shaft, and along the radial direction, the connecting portion and the second rotating shaft are interference-fitted.

2. The rotor structure as described in claim 1, characterized in that, The first and second rotating shafts are not connected by a locking ring.

3. The rotor structure as described in claim 1, characterized in that, Along the radial direction, the first rotating shaft includes a first protrusion, one end of which is connected to the connecting portion. Along the axial direction, the first protrusion abuts against one end of the second rotating shaft.

4. The rotor structure as described in claim 3, characterized in that, The connecting part includes a first part and a second part. Along the axial direction, one end of the first part is connected to the first protrusion, and the other end is connected to the second part. The second part abuts against the first end cap. Along the radial direction, the first part is interference-fitted with the second rotating shaft. The diameter of the second part is not less than the diameter of the first part.

5. A rotor structure as described in any one of claims 1-4, characterized in that, It includes a second end cap, which is sleeved on the second rotating shaft along the circumferential direction and abuts against the plurality of stacked pieces along the axial direction. The plurality of stacked pieces are located between the first end cap and the second end cap.

6. A rotor structure as described in claim 5, characterized in that, Along the radial direction, the second shaft includes a second protrusion, and along the axial direction, the second end cap is located between the plurality of stacked plates and the second protrusion, and abuts against each other along the axial direction.

7. A rotor structure as described in claim 1, characterized in that, Both the first and second rotating shafts include hollow shafts.

8. An electric motor, characterized in that, Includes a rotor structure as described in any one of claims 1-7.

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