Rotor core, motor rotor, and motor

Abstract

This utility model belongs to the field of motor technology, and specifically relates to a rotor core, a motor rotor, and a motor. The rotor core includes multiple rotor laminations stacked along the axial direction of the rotor core, and each lamination has a magnetic slot. The rotor core contains a first channel and a second channel, both extending radially along the rotor laminations. A third channel, also extending axially along the rotor core, communicates with the magnetic slots of each rotor lamination. The first channel receives the cooling medium from the motor rotor and is connected to the third channel via the second channel. This utility model uses the first and second channels to allow the cooling medium to flow into the third channel, which is connected to the magnetic slots. The cooling medium flows axially along the rotor core within the third channel and can also flow along the gaps around the magnets, directly contacting and cooling the magnets, thus improving the cooling effect.

Description

Technical Field

[0001] This utility model belongs to the field of motor technology, and in particular relates to a rotor core, a motor rotor, and a motor. Background Technology

[0002] Electric motors are a crucial component of new energy vehicles, generating torque to drive the car. Most new energy vehicle drive motors are permanent magnet motors. The permanent magnets mounted on the motor rotor generate a magnetic field, which interacts with the magnetic field generated by the motor stator windings to produce electromagnetic torque that drives the rotor to rotate.

[0003] The rotor contains magnets, and due to eddy current losses in the magnets, the maximum temperature can reach 150℃ or higher. To meet high-temperature performance requirements and prevent demagnetization, the magnets need to be selected with a grade suitable for the maximum operating temperature. Higher-grade magnets are more expensive. Therefore, cooling channels need to be installed inside the rotor to cool it, allowing for the selection of lower-grade magnets to reduce costs.

[0004] Existing cooling channels typically introduce oil from within the end plate, then cool the magnets through oil channels within the rotor laminations. However, in these existing channels, the cooling medium cannot directly contact the magnets, resulting in poor heat dissipation. Utility Model Content

[0005] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a rotor core, a motor rotor and a motor to solve the problem of poor cooling effect of the magnets in the rotor core in the prior art.

[0006] To achieve the above and other related objectives, this utility model provides a rotor core, comprising a plurality of rotor laminations stacked along the axial direction of the rotor core, wherein the rotor laminations are provided with magnetic slots.

[0007] The rotor core is provided with a first channel and a second channel, both of which extend radially along the rotor laminations.

[0008] The rotor core is provided with a third channel extending along the axial direction of the rotor core. The third channel is connected to the magnet slots of each rotor lamination. The first channel is used to receive the cooling medium of the motor rotor, and the first channel is connected to the third channel through the second channel.

[0009] Furthermore, the rotor lamination includes a first lamination and a second lamination. The first lamination has a first through hole that communicates with the shaft hole of the first lamination. The second lamination has a second through hole that communicates with the third channel. The first through hole forms a first channel, and the second through hole forms a second channel. Along the axial direction of the rotor core, the first through hole and the second through hole at least partially overlap.

[0010] Furthermore, a magnetic groove is also provided on the second lamination, and the second through hole communicates with the magnetic groove on the second lamination.

[0011] Furthermore, the third channel is formed by stacking the magnet slots of each rotor lamination along the rotor core axial direction.

[0012] Furthermore, along the axial direction of the rotor core, the first through hole partially overlaps with at least one of the second through holes.

[0013] Furthermore, the rotor lamination includes a third lamination, the first lamination and the second lamination are arranged adjacent to each other, the third lamination is located on the side closer to the first lamination or on the side closer to the second lamination, or the third lamination is provided on both sides of the first lamination and the second lamination.

[0014] Furthermore, the first lamination has at least two layers of magnetic slots, and each magnetic slot on the rotor lamination is arranged sequentially along the radial direction of the rotor lamination; along the axial direction of the rotor core, the magnetic slots of the second lamination overlap at least partially with each layer of magnetic slots of the first lamination and the second lamination.

[0015] Furthermore, the rotor core also includes a fourth lamination, which is located between the first lamination and the second lamination. The fourth lamination has a fourth through hole along the axial direction of the rotor core, forming a fourth channel. One end of the fourth channel is connected to the first channel, and the other end is connected to the second channel.

[0016] Secondly, this utility model also provides a motor rotor, including the rotor core and the shaft described above. The shaft passes through the rotor core and has an oil inlet channel inside. The oil inlet channel is connected to the first channel through an oil inlet port. The end cover plate is disposed on both sides of the rotor core.

[0017] Thirdly, this utility model also provides an electric motor, including the motor rotor described above.

[0018] As described above, the present invention has the following beneficial effects: The present invention sets up a first channel and a second channel to allow the cooling medium to flow into a third channel. The third channel is connected to the magnet slot. The cooling medium flows along the rotor core axis in the third channel. The cooling medium can flow along the gaps around the magnet and directly contact the magnet to cool it down, thereby improving the cooling effect. Attached Figure Description

[0019] Figure 1 Cross-sectional view of the rotor core provided by this utility model Figure 1 ;

[0020] Figure 2 Cross-sectional view of the rotor core provided by this utility model Figure 2 ;

[0021] Figure 3 Cross-sectional view of the rotor core provided by this utility model Figure 3 ;

[0022] Figure 4 Cross-sectional view of the rotor core provided by this utility model Figure 4 ;

[0023] Figure 5 for Figure 1 The corresponding exploded diagram of the rotor core;

[0024] Figure 6 for Figure 4 The corresponding exploded diagram of the rotor core;

[0025] Figure 7 This is a schematic diagram of the third lamination.

[0026] Figure 8 This is a schematic diagram of the structure of the first lamination;

[0027] Figure 9 This is a schematic diagram of the structure of the second lamination;

[0028] Figure 10 A partial schematic diagram of the rotor core;

[0029] Figure 11 This is a schematic diagram of the structure of the first core segment and the second core segment combined.

[0030] Label Explanation

[0031] 1-First core segment, 11-First channel, 12-First lamination, 13-First through hole, 2-Second core segment, 21-Second channel, 22-Second lamination, 23-Second through hole, 3-Third core segment, 31-Third channel, 32-Third lamination, 4-Fourth core segment, 41-Fourth channel, 42-Fourth lamination, 43-Fourth through hole, 5-Magnetic groove, 6-Shaft, 61-Oil inlet channel, 62-Oil inlet hole, 7-End cover plate, 8-Shaft hole. Detailed Implementation

[0032] 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.

[0033] It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings of this specification are only for illustrative purposes to aid those skilled in the art and are not intended to limit the implementation of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effects and objectives of this utility model, should still fall within the scope of the technical content disclosed in this utility model. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity of description and are not intended to limit the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of implementation of this utility model.

[0034] In order to describe this utility model in detail, the motor rotor, motor and vehicle provided by this utility model will be specifically described below.

[0035] like Figures 1 to 11 As shown, this utility model provides a rotor core, which is composed of multiple rotor laminations stacked along the rotor core axial direction. Each rotor lamination has a magnet slot 5. Each rotor lamination has a center hole 8 for matching with a motor shaft 6. The rotor core contains a first channel 11 and a second channel 21, both extending radially along the rotor laminations. A third channel 31 extending axially along the rotor core is also provided, with the first channel 11 connected to the third channel 31 via the second channel 21. The third channel 31 is connected to the magnet slots of each rotor lamination.

[0036] Specifically, the rotor core includes a first core segment 1 and a second core segment 2 arranged adjacent to each other. The first core segment 1 is formed by stacking first laminations 12 along the axial direction of the rotor core, and the second core segment 2 is formed by stacking second laminations 22 along the axial direction of the rotor core. Figure 8As shown, the first lamination 12 is provided with a first through hole 13. One end of the first through hole 13 is connected to the shaft hole 8 of the first lamination 12, while the other end of the first through hole 13 is not connected to the magnet slot 5 of the first lamination 12. After entering through the first channel 11, the cooling oil flows into the magnet slot 5 through the second channel 21 and the third channel 31. The cooling oil directly provides targeted heat dissipation to the magnet area, significantly reducing the operating temperature of the magnet and the rotor core.

[0037] In some embodiments, in order to reduce the types of rotor laminations, the third channel 31 is formed by stacking the magnet slots of each rotor lamination along the rotor core axis, that is, the cooling oil flows directly into the channel formed by the magnet slots after passing through the second channel 21.

[0038] The second lamination 22 is provided with a second through hole 23. One end of the second through hole 23 is connected to the magnet slot 5, and the other end is not connected to the shaft hole 8 of the second lamination 22. After multiple first laminations 12 and second laminations 22 are overlapped, the first through hole 13 forms a first channel 11 along the radial direction of the rotor lamination, and the second through hole 23 forms a second channel 21 along the radial direction of the rotor lamination.

[0039] like Figure 8 As shown, the first through hole 13 is equivalent to a groove in the radial direction of the first lamination 12 that connects to multiple shaft holes 8. The first through hole 13 can be arc-shaped, polygonal, U-shaped, or other shaped, and its main function is to guide the cooling oil out of the oil inlet channel 61 of the rotating shaft 6. Figure 6 , Figure 9 and Figure 10 As shown, the second through hole 23 is equivalent to providing multiple slots extending radially along the rotor lamination in the radial direction of the second lamination 22. The second through hole 23 can be a strip-shaped slot or a slot of other shapes.

[0040] The rotor core also includes a third core section 3. The first core section 1 and the second core section 2 are arranged adjacent to each other. The third core section 3 is formed by stacking third laminations 32 along the axial direction.

[0041] In some embodiments, the third core segment 3 may be disposed on the side of the first core segment 1 away from the second core segment 2, as needed, and end caps 7 are respectively installed on both sides of the third core segment 3 and the second core segment 2. Figure 3As shown, after passing through the first channel 11 of the first iron core section 1, the cooling oil enters the second channel 21 of the second iron core section 2. Part of the cooling oil passes through the magnet groove 5 of the second iron core section 2 and enters the magnet groove of the third iron core section 3. Then, it flows axially to the left, passing through the magnet groove 5 of the first iron core section 1 and the magnet groove 5 of the third iron core section 3 in sequence, and finally flows out through the end cover plate 7 on the side of the third iron core section 3. Part of the cooling oil passes through the second through hole 23 of the second iron core section 2 and flows to the end cover plate 7 on the side of the second iron core section 2. After cooling the magnets in the magnet groove 5 of the second iron core section 2, it flows out through the end cover plate 7 on the right side.

[0042] In some embodiments, the third core segment 3 is disposed on the side of the second core segment 2 away from the first core segment 1. For example... Figure 2 As shown, end caps 7 are provided on both sides of the first core section 1 and the third core section 3. After passing through the first channel 11 of the first core section 1, the cooling oil enters the second channel 21 of the second core section 2. Part of the cooling oil passes through the magnet groove 5 of the second core section 2 and enters the magnet groove of the third core section 3 to the right, and finally flows out through the end cap 7 on the side of the third core section 3. Part of the cooling oil passes through the second through hole 23 of the second core section 2 and enters the magnet groove 5 of the first core section 1 through the magnet groove 5 of the second core section 2. After cooling the magnets in the magnet groove 5 of the first core section 1, the cooling oil flows out through the end cap 7 on the left side.

[0043] Both schemes allow for the absence of oil outlet holes on the end cover plate 7 on the side away from the third core section 3, with oil outlets only on the end cover plate 7 on the side closer to the third core section 3. This extends the path of the cooling oil within the rotor core and improves the cooling effect.

[0044] In some embodiments, a third core segment 3 is provided on both sides of the first core segment 1 and the second core segment 2. For example... Figure 1 and Figure 5 As shown, the cooling oil enters the second channel 21 of the second core section 2 after passing through the first channel 11 of the first core section 1. The cooling oil then enters the magnetic groove of the third core section 3 through the magnetic groove 5 of the second core section 2, flows sequentially along the left side of the axial direction through the magnetic grooves 5 of the first core section 1 and the third core section 3, and along the right side of the axial direction through the magnetic grooves 5 of the third core section 3, finally flowing out through the end covers 7 on both sides. With the entire rotor core thickness being the same, compared to the previous two schemes, the scheme where the third core section 3 is set on both sides of the first core section 1 and the second core section 2 allows the cooling oil to be directly divided into two directions after passing through the second channel 21, which is more conducive to heat dissipation. Along the rotor core axial direction, the arrangement can also be the third core section, the second core section, the first core section, and the third core section.

[0045] The structure of the third lamination 32 is similar to that of the first lamination 12, but the third lamination 32 does not have the first through hole 13. The first core segment 1 is used to form the first channel 11, the second core segment 2 is used to form the second channel 21, and the third core segment 3 is used to form the third channel 31. In this embodiment, the three channels are formed by three different laminations, so as not to affect the strength of the rotor core. By forming different core segments with three laminations, the main function of the first core segment 1 is to introduce the cooling oil in the cooling channel of the shaft 6 into the rotor core. The second core segment 2 can not only transmit the cooling oil radially, but also increase the thickness of the second channel 21. The third core segment 3 is mainly used to fix the magnets.

[0046] Of course, three channels or two channels can be set on the same type of rotor lamination at the same time. However, if the first channel 11, the second channel 21 and the third channel 31 are set on the same type of rotor lamination at the same time, the strength of the rotor lamination is weak and it is easy to break. Therefore, in this embodiment, different laminations are used for different channels, which can effectively fix the magnets and at the same time not affect the strength of the rotor core.

[0047] In some embodiments, the thickness of the first core segment 1 and the second core segment 2 is related to the flow area of ​​the first channel 11 and the second channel 21. To ensure the flow effect of the cooling oil, the flow areas of the first channel 11 and the second channel 21 are preferably the same, and preferably the flow areas of the first channel 11 and the second channel 21 are larger than the flow area of ​​the third channel 31, so as not to affect the cooling of the magnet. For example, in the scheme where a third core segment 3 is provided on both sides of the first core segment 1 and the second core segment 2, the cooling oil is diverted after passing through the second channel 21 to flow to different third core segments 3 on both sides, which is equivalent to dividing into two parallel branches. Therefore, in order not to affect the cooling effect, the flow area of ​​the first channel 11 and the second channel 21 needs to be larger than the flow area of ​​the third channel 31. The specific thickness of the first core segment 1 and the second core segment 2 is related to the size of the first through hole 13 and the second through hole 23.

[0048] In some embodiments, the first through hole 13 and the second through hole 23 can correspond one-to-one, that is, each second through hole 23 corresponds to one first through hole 13, and the number of first through holes 13 is the same as the number of second through holes 23. To increase the strength of the first punch 12, in some embodiments, such as... Figure 11 As shown, one first through hole 13 corresponds to two second through holes 23. Along the rotor core axis, the first through hole 13 and the two second through holes 23 partially overlap, so that the cooling oil in the first channel 11 can smoothly enter the second channel 21.

[0049] In some embodiments, the magnetic slots 5 of the first lamination 12 and the third lamination 32 are arranged in any one or any combination of single-layer straight, single-layer V-shaped, single-layer C-shaped, multi-layer V-shaped, and multi-layer C-shaped.

[0050] In some embodiments, if the magnetic grooves 5 of the first lamination 12 and the third lamination 32 are provided with only a single layer of magnetic grooves along the radial direction, and the magnetic grooves 5 of the second lamination 22 have the same shape as the magnetic grooves 5 of the first lamination 12 and the third lamination 32, then only one type of second lamination 22 is needed to connect the second through hole 23 with each of the third channels 31.

[0051] In some embodiments, when the magnetic grooves 5 of the first lamination 12 and the third lamination 32 are arranged in two or more layers along the radial direction, if the magnetic grooves 5 of the second lamination 22 have the same shape as the magnetic grooves 5 of the first lamination 12 and the third lamination 32, then multiple types of second laminations 22 are required. For example, the second through hole 23 of one type of second lamination 22 is connected to the magnetic groove 5 of the inner layer, the second through hole 23 of at least one type of second lamination 22 is connected to the magnetic groove 5 of the middle layer, and the second through hole 23 of one type of second lamination 22 is connected to the magnetic groove 5 of the outer layer. Thus, multiple different types of second laminations 22 are required.

[0052] Therefore, in order to reduce the types of rotor laminations, in some embodiments, the shape of the magnet slot 5 of the second lamination 22 is not the same as the shape of the magnet slot 5 of the first lamination 12 and the third lamination 32. For example... Figure 6 As shown, the area of ​​the second lamination 22 corresponding to the magnetic slot 5 of the first lamination 12 is a through slot along the radial direction. This is equivalent to hollowing out the area of ​​the second lamination 22 corresponding to the magnetic slot 5 of the first lamination 12. The multiple magnetic slots 5 are interconnected. Thus, when the cooling oil enters the second channel 21 of the second core section 2, it then enters the magnetic slot 5 of the second core section 2. Since the magnetic slot 5 of the second core section 2 is connected to each layer of magnetic slot 5 in the other core sections, there is no need to set up additional channels, thereby reducing the types of rotor laminations.

[0053] In some embodiments, to extend the axial cooling channel length and enhance the cooling effect on the rotor core, a fourth core segment 4 is added between the first core segment 1 and the second core segment 2. The fourth core segment 4 has a fourth channel 41 arranged along the axial direction of the rotor core, which can further dissipate heat from the rotor core. The fourth core segment 4 is formed by stacking fourth laminations 42 axially. Figure 6 As shown, the fourth lamination 42 is provided with a fourth through hole 43. The fourth through hole 43 is neither connected to the shaft hole 8 of the fourth lamination 42 nor to the magnetic groove 5 of the fourth lamination 42. The fourth through hole 43 is connected to the first through hole 13. Figure 4As shown, after passing through the first channel 11 of the first iron core section 1, the cooling oil enters the fourth channel 41 of the fourth iron core section 4 and flows axially. Then it enters the second channel 21 of the second iron core section 2. The cooling oil then enters the magnet of the third iron core section 3 through the magnet groove 5 of the second iron core section 2. Along the left side of the axis, it passes through the magnet groove 5 of the fourth iron core section 4, the first iron core section 1 and the third iron core section 3 in sequence. Along the right side of the axis, it passes through the magnet groove 5 of the third iron core section 3 and finally flows out through the end cover plates 7 on both sides.

[0054] The rotor core is sleeved on the rotating shaft 6, which is hollow and has an internal oil inlet channel 61. At least one oil inlet hole 62 is provided along the axial direction of the rotating shaft 6; multiple oil inlet holes 62 can also be provided, such as... Figure 10 As shown. The oil inlet channel 61 inside the rotating shaft 6 is connected to the first channel 11 of the first iron core section 1 through the oil inlet hole 62. A groove can also be provided on the rotating shaft 6, and an oil inlet hole 62 is provided at the groove. The cooling oil in the oil inlet channel 61 enters the groove through the oil inlet hole 62 and then enters each of the first channels 11.

[0055] Secondly, this utility model also provides a motor rotor, including the aforementioned rotor core, shaft 6 and end cover plate 7. The shaft 6 is inserted into the rotor core and has an oil inlet channel 61 inside. The oil inlet channel 61 is connected to the first channel 11 through an oil inlet hole 62. The end cover plate 7 is disposed on both sides of the rotor core.

[0056] Thirdly, this utility model also provides an electric motor, including the aforementioned motor rotor.

[0057] 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 core, characterized in that, It includes multiple rotor laminations, which are stacked along the axial direction of the rotor core, and the rotor laminations are provided with magnetic slots; The rotor core is provided with a first channel and a second channel, both of which extend radially along the rotor laminations. The rotor core is provided with a third channel extending along the axial direction of the rotor core. The third channel is connected to the magnet slots of each rotor lamination. The first channel is used to receive the cooling medium of the motor rotor, and the first channel is connected to the third channel through the second channel.

2. The rotor core according to claim 1, characterized in that, The rotor lamination includes a first lamination and a second lamination. The first lamination has a first through hole that communicates with the shaft hole of the first lamination. The second lamination has a second through hole that communicates with the third channel. The first through hole forms a first channel, and the second through hole forms a second channel. Along the axial direction of the rotor core, the first through hole and the second through hole at least partially overlap.

3. The rotor core according to claim 2, characterized in that, The second lamination is also provided with a magnetic groove, and the second through hole is connected to the magnetic groove on the second lamination.

4. The rotor core according to claim 3, characterized in that, The third channel is formed by stacking the magnet slots of each rotor lamination along the rotor core axial direction.

5. The rotor core according to claim 2, characterized in that, Along the axial direction of the rotor core, the first through hole partially overlaps with at least one of the second through holes.

6. The rotor core according to claim 2, characterized in that, The rotor lamination includes a third lamination. The first lamination and the second lamination are arranged adjacent to each other. The third lamination is located on the side closer to the first lamination or on the side closer to the second lamination, or the third lamination is provided on both sides of the first lamination and the second lamination.

7. The rotor core according to claim 6, characterized in that, The first lamination has at least two layers of magnetic slots, and each magnetic slot on the rotor lamination is arranged sequentially along the radial direction of the rotor lamination; along the axial direction of the rotor core, the magnetic slots of the second lamination overlap at least partially with each layer of magnetic slots of the first lamination and the second lamination.

8. The rotor core according to any one of claims 2-7, characterized in that, The rotor core also includes a fourth lamination, which is located between the first lamination and the second lamination. The fourth lamination has a fourth through hole along the axial direction of the rotor core, forming a fourth channel. One end of the fourth channel is connected to the first channel, and the other end is connected to the second channel.

9. A motor rotor, characterized in that, The rotor core as described in any one of claims 1-8 and the rotating shaft are provided inside the rotor core. The rotating shaft is provided with an oil inlet channel and the oil inlet channel is connected to the first channel through an oil inlet.

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

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