Rotor assembly for motor and motor

Abstract

The utility model relates to a rotor assembly for a motor and the motor. A rotor assembly for a motor comprises a rotor support which comprises a cylindrical portion extending in the axial direction and a plurality of oil supply holes located in the cylindrical portion and penetrating in the radial direction; the rotor iron core comprises a plurality of magnet grooves, and at least one part of the magnet grooves forms a cooling channel penetrating through the rotor iron core in the axial direction; the first flow guide plate is arranged on one side of the axial direction of the rotor iron core, the first flow guide plate and the rotor iron core are both in an annular shape and are connected to the radial outer surface of the cylindrical part of the rotor support in an anti-torsion mode, and the first flow guide plate and the rotor iron core are arranged to be adjacent in the axial direction; and the first flow guide plate is configured to enable the first flow guide plate, the rotor core and the cylindrical part of the rotor bracket to form a first flow guide chamber, and the first flow guide chamber is in fluid communication with the oil supply hole and the cooling channel respectively.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and more particularly to a rotor assembly for a motor and the motor. Background Art

[0002] Hybrid vehicles use a hybrid module, such as a P1 or P2 hybrid module. The hybrid module includes a motor and a clutch. The motor includes a stator assembly and a rotor assembly located within the stator assembly. The motor's rotor assembly includes a rotor support and a rotor core disposed radially outward from the rotor support. The clutch is disposed radially inward from the rotor support. During operation of the hybrid module, coolant cools the clutch and motor in sequence. As the motor's rotor assembly rotates, coolant flowing from the clutch flows radially outward from both axial sides of the rotor core to the stator assembly, without directly cooling the rotor core of the rotor assembly.

[0003] Therefore, a rotor assembly and a motor are needed that can improve the cooling performance of the rotor assembly. Utility Model Content

[0004] One object of the present invention is to provide a rotor assembly and a motor capable of improving the cooling performance of the rotor assembly. Another object of the present invention is to provide a rotor assembly and a motor capable of flexibly designing a cooling path.

[0005] One aspect of the present invention provides a rotor assembly for an electric motor, comprising: a rotor support including an axially extending cylindrical portion and a plurality of oil supply holes located on the cylindrical portion and extending radially therethrough; a rotor core including a plurality of magnet slots, wherein at least a portion of the magnet slots form a cooling channel extending axially therethrough; and a first guide plate disposed on one axial side of the rotor core, wherein the first guide plate and the rotor core both have an annular shape and are both torsionally connected to the radially outer surface of the cylindrical portion of the rotor support, and wherein the first guide plate and the rotor core are disposed axially adjacent to each other, and the first guide plate is configured such that the first guide plate, the rotor core, and the cylindrical portion of the rotor support form a first guide chamber, the first guide chamber being in fluid communication with the oil supply holes and the cooling channel, respectively. When the guide plate according to an embodiment of the present invention is employed, during operation of the motor, coolant located radially inside the rotor support (e.g., flowing out of a clutch) can enter the guide chamber through the oil supply holes of the rotor support and flow into the cooling channel of the rotor core under the guidance of the guide plate. As a result, the coolant can cool the rotor core and magnets more effectively, thereby improving the cooling performance of the rotor assembly.

[0006] According to certain embodiments of the present invention, the rotor assembly further includes a second guide plate disposed on the other axial side of the rotor core. The second guide plate has an annular shape and is non-rotatably connected to the radially outer surface of the cylindrical portion of the rotor support. The second guide plate is axially adjacent to the rotor core and is configured such that the second guide plate, the rotor core, and the cylindrical portion of the rotor support form a second guide chamber, which is in fluid communication with the oil supply hole and the cooling channel, respectively. Thus, guide plates can be disposed on both axial sides of the rotor core, enabling flexible design of the rotor assembly's cooling path.

[0007] According to certain embodiments of the present invention, the first guide plate has an annular truncated cone shape, thereby the guide plate can be conveniently manufactured, for example, by a process such as stamping.

[0008] According to certain embodiments of the present invention, the first and second guide plates each include a plurality of circumferentially spaced guide segments, each of which includes an inclined surface extending obliquely relative to the rotational axis. The first and second guide plates are configured such that the inclined surfaces, the rotor core, and the cylindrical portion of the rotor support form a first and second guide chamber, respectively. This allows each guide segment of the guide plate to more precisely cool corresponding portions of the rotor core, improving design flexibility.

[0009] According to certain embodiments of the present invention, the first flow guiding chamber and the second flow guiding chamber are staggered along the circumferential direction, so that the coolants cooling the rotor core from both axial sides do not interfere with each other, thereby improving the overall cooling efficiency.

[0010] According to certain embodiments of the present invention, the first guide plate and the second guide plate have the same shape, thereby allowing the guide plates having the same shape to be conveniently installed in the rotor assembly.

[0011] According to certain embodiments of the present invention, the rotor assembly further includes a plurality of magnets, each magnet being disposed in a corresponding magnet slot, wherein the cooling channel is disposed radially outside the magnet.

[0012] According to certain embodiments of the present invention, the rotor assembly further includes magnetic glue for fixing the magnets, which is disposed in the magnet slots and located radially inward of the magnets.

[0013] According to certain embodiments of the present invention, the first guide plate and / or the second guide plate are configured to be disposed on the radial outer surface of the cylindrical portion of the rotor support by interference fitting.

[0014] Another aspect of the present invention provides a motor, comprising a rotor assembly according to an embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The present invention is a partial cross-sectional schematic diagram of an electric machine including a stator assembly.

[0016] Figure 2 This is a schematic diagram of a rotor core.

[0017] Figure 3 Schematic diagram of a rotor assembly according to an embodiment of the present invention.

[0018] Figure 4 It is a cross-sectional schematic diagram of a rotor assembly according to an embodiment of the present utility model.

[0019] Figure 5 Schematic diagram of a guide plate of a rotor assembly according to an embodiment of the present utility model.

[0020] Figure 6 It is a schematic cross-sectional view of a guide plate of a rotor assembly according to an embodiment of the present utility model.

[0021] Figure 7 It is a three-dimensional schematic diagram of a rotor core of a rotor assembly according to an embodiment of the present utility model.

[0022] Figure 8 It is an axial schematic diagram of a rotor core of a rotor assembly according to an embodiment of the present utility model.

[0023] Figure 9 is a schematic diagram of a rotor assembly according to another embodiment of the present invention.

[0024] Figure 10 It is a schematic cross-sectional view of a rotor assembly according to another embodiment of the present invention.

[0025] Figure 11 Schematic diagram of a guide plate of a rotor assembly according to another embodiment of the present invention. DETAILED DESCRIPTION

[0026] Hereinafter, embodiments of the present invention are described with reference to the accompanying drawings. The following detailed description and accompanying drawings are used to exemplarily illustrate the principles of the present invention. The present invention is not limited to the preferred embodiments described, and the scope of the present invention is defined by the claims. The present invention is now described in detail with reference to exemplary embodiments, and some embodiments are illustrated in the accompanying drawings. The following description is made with reference to the accompanying drawings, and unless otherwise indicated, the same figure numbers in different drawings represent the same or similar elements. The schemes described in the following exemplary embodiments do not represent all schemes of the present invention. On the contrary, these schemes are merely examples of systems and methods of various aspects of the present invention involved in the appended claims.

[0027] Figure 1 The figure is a partial cross-sectional schematic diagram of a motor including a stator assembly. Figure 1 As shown, the rotor assembly includes a rotor support 1 and a rotor core 2. The rotor core 2 is connected to the radial outer side of the rotor support 1 in a torsionally fixed manner. The motor clutch 3 is connected to the radial inner side of the rotor support 1 in a torsionally fixed manner. During motor operation, the rotor assembly rotates, and after leaving the clutch 3, the coolant flows radially outward through the oil supply holes of the rotor support 1 and flows through both axial sides of the rotor core 2. However, as Figure 1 As shown by the middle arrow, the coolant does not directly cool the rotor core 2, but flows directly to the stator assembly of the motor. In addition, the rotor core 2 does not provide a cooling channel for the coolant. Figure 2 This is a schematic diagram of a rotor core. Figure 2 As shown, the rotor core 2 includes multiple magnet slots 4, each for receiving a magnet 5. The magnets 5 are secured in the slots 4 by magnetic adhesive 6, which is located radially inward and radially outward of the magnets 5 within the slots 4. As can be seen, current motors lack cooling paths designed for the rotor assembly, resulting in low cooling efficiency.

[0028] To address the above-mentioned technical problems, the present invention provides a rotor assembly for an electric motor. In an exemplary embodiment, the rotor assembly of the present invention is applied to an electric motor of a vehicle, particularly an electric motor of a P1 or P2 hybrid module. However, the present invention is not limited thereto. Exemplary embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that the drawings illustrate only certain embodiments of the present invention, and the scope of the present invention should be determined in accordance with the claims.

[0029] Figure 3 Schematic diagram of a rotor assembly according to an embodiment of the present invention. Figure 4 It is a cross-sectional schematic diagram of a rotor assembly according to an embodiment of the present utility model. Figure 5 Schematic diagram of a guide plate of a rotor assembly according to an embodiment of the present utility model. Figure 6 It is a schematic cross-sectional view of a guide plate of a rotor assembly according to an embodiment of the present utility model. Figure 7 It is a three-dimensional schematic diagram of a rotor core of a rotor assembly according to an embodiment of the present utility model. Figure 8 It is an axial schematic diagram of a rotor core of a rotor assembly according to an embodiment of the present utility model.

[0030] According to certain embodiments of the present invention, Figure 3 and Figure 4 As shown, the rotor assembly includes a rotor support 10, a rotor core 20 and a first guide plate 30. Figure 4 、 Figure 7 and Figure 8 As shown, the rotor assembly may further include a plurality of magnets 40 and magnetic glue 50 .

[0031] The rotor support 10 has a generally annular shape and includes an axially extending hollow cylindrical portion 11 and a plurality of oil supply holes 12 radially extending through the cylindrical portion 11. In some embodiments, the rotor support 10 is configured as a substantially basin-shaped support element. The cylindrical portion 11 of the rotor support 10 is used to support the rotor core 20 via its radially outer surface. In some embodiments, a clutch (not shown) of the hybrid module can be positioned radially inwardly of the rotor support 10 and secured thereto.

[0032] The rotor core 20 is arranged on the radial outer surface of the cylindrical portion 11 of the rotor support 10 in a rotationally fixed manner, for example, by interference fit. In some embodiments, the rotor core 20 is composed of a plurality of laminations.

[0033] According to the embodiment of the present utility model, Figure 7 and Figure 8 As shown, the rotor core 20 includes a plurality of magnet slots 21. Each magnet 40 is disposed in a corresponding magnet slot 21. According to an embodiment of the present invention, at least a portion of the magnet slot 21 forms a cooling channel 22 that axially penetrates the rotor core 20. In an exemplary embodiment, the magnet slot 21 is disposed so as to axially penetrate the rotor core 21. In some embodiments, the magnet slot 21 extends obliquely relative to the radial direction. The length of the magnet 40 is less than the length for accommodating the magnet slot 21.

[0034] Magnetic glue 50 is also provided in the magnet slots 21 for fixing the magnets 40 to the rotor core 20. Figure 7 and Figure 8 As shown, the magnetic glue 50 is located radially inside the magnet 50 in the magnet slot 21, the magnet 40 is arranged in the radial middle of the magnet slot 21, and the cooling channel 22 is located radially outside the magnet 50 in the magnet slot 21. Figure 2 Unlike the case in which magnetic glue is provided on both the radial inner side and the radial outer side of the magnet as shown in the figure, in this embodiment, magnetic glue 50 is provided only on the radial inner side of the magnet 40 and no magnetic glue is provided on the radial outer side of the magnet 40. On the one hand, a cooling channel 22 can be formed in the portion of the magnet slot 21 where no magnetic glue is provided, and on the other hand, the amount of magnetic glue used can be reduced.

[0035] The first guide plate 30 is used to guide the flow of the coolant. In the exemplary embodiment, the first guide plate 30 is disposed on one axial side of the rotor core 20. The first guide plate 30 has a generally annular shape and is disposed on the radially outer surface of the cylindrical portion 11 of the rotor support 10 in a torsionally fixed manner, for example, by an interference fit.

[0036] The first guide plate 30 is arranged adjacent to the rotor core 20 in the axial direction. The first guide plate 30 has a funnel shape. In an exemplary embodiment, Figure 5 and Figure 6 As shown, the first guide plate 30 has an annular truncated cone shape, that is, a truncated cone shape with a central hole.

[0037] like Figure 4 As shown, the first guide plate 30 is arranged such that the first guide plate 30, the rotor core 20, and the cylindrical portion 11 of the rotor support 10 form a first guide chamber S that is in fluid communication with the oil supply hole 12 and the cooling channel 22, respectively. More specifically, the narrow end of the first guide plate 30 is located on a side away from the rotor core 20, while the wide end is located on a side close to the rotor core 20.

[0038] The first guide plate 30 may be made of a non-magnetizable material, such as stainless steel. In some embodiments, the first guide plate 30 may be made by a stamping process.

[0039] When the first guide plate 30 according to the embodiment of the present invention is used, during the operation of the motor, the coolant located radially inward of the rotor support 10 (e.g., flowing out of the clutch) can enter the first guide chamber S through the oil supply hole 12 of the rotor support 10 and flow into the cooling channel 22 of the rotor core 20 under the guidance of the first guide plate 30. As a result, the coolant can cool the rotor core 20 and the magnet 40 more effectively. In some embodiments, such as Figure 4 As shown by the middle arrow, the coolant flowing out of the cooling channel 22 may also flow to the stator assembly located radially outside the rotor assembly to cool the stator assembly.

[0040] In the above description, the cooling channel 22 is located on the radially outer side of the magnet 40 . However, the present invention is not limited thereto. In some embodiments, the cooling channel 22 may also be located on the radially inner side of the magnet 40 .

[0041] The above description describes that the first guide plate 30 is disposed on one axial side of the rotor core 20. However, the present invention is not limited thereto. In some embodiments, guide plates may be disposed on both axial sides of the rotor core 20. This embodiment will be described in detail below with reference to the accompanying drawings.

[0042] Figure 9 is a schematic diagram of a rotor assembly according to another embodiment of the present invention. Figure 10 It is a schematic cross-sectional view of a rotor assembly according to another embodiment of the present invention. Figure 11 Schematic diagram of a guide plate of a rotor assembly according to another embodiment of the present invention.

[0043] like Figure 9 and Figure 10As shown, the rotor assembly includes a first deflector plate 30 and a second deflector plate 30'. The first deflector plate 30 is disposed on one axial side of the rotor core 20, while the second deflector plate 30' is disposed on the other axial side of the rotor core 20. The first deflector plate 30 and the second deflector plate 30' each have a generally annular shape and are torque-proof disposed on the radially outer surface of the cylindrical portion 11 of the rotor support 10, for example, by an interference fit. The first deflector plate 30 and the second deflector plate 30' are each disposed axially adjacent to the rotor core 20.

[0044] The first guide plate 30 is arranged so that the first guide plate 30, the rotor core 20 and the cylindrical portion 11 of the rotor support 10 form a first guide chamber S that is fluidically connected to the oil supply hole 12 and the cooling channel 22, respectively. The second guide plate 30' is arranged so that the second guide plate 30', the rotor core 20 and the cylindrical portion 11 of the rotor support 10 form a second guide chamber S' that is fluidically connected to the oil supply hole 12 and the cooling channel 22, respectively.

[0045] In an exemplary embodiment, the first guide plate 30 and the second guide plate 30' have the same shape. Each of the first guide plate 30 and the second guide plate 30' includes a plurality of guide sections 30A and a plurality of non-guide sections 30B spaced apart in the circumferential direction.

[0046] like Figure 10 and Figure 11 As shown, each guide segment 30A includes an inclined surface 30C that extends obliquely from the radially outer side to the radially inner side relative to the rotation axis. Thus, the inclined surfaces 30C of the guide segments 30A, the rotor core 20, and the cylindrical portion 11 of the rotor support 10 form a first guide chamber S and a second guide chamber S', respectively. In the exemplary embodiment, the first guide chamber S formed by the first guide plates 30 and the second guide chamber S' formed by the second guide plates 30' are arranged alternately along the circumferential direction.

[0047] When the first guide plate 30 and the second guide plate 30' according to the embodiment of the present invention are used, during the operation of the motor, the coolant located on the radial inner side of the rotor support 10 (for example, flowing out of the clutch) can enter the first guide chamber S / second guide chamber S' through the oil supply hole 12 of the rotor support 10, and flow into the cooling channel 22 of the rotor core 20 under the guidance of the first guide plate 30 / second guide plate 30'. As a result, the coolant can cool the rotor core 20 and the magnet 40 more effectively. In some embodiments, such as Figure 10 As shown by the middle arrow, after being guided by the guide section 30A of the first guide plate 30 and flowing through the cooling channel 22, the coolant can also flow out from the non-guide section 30B of the second guide plate 30' and flow to the stator assembly located radially outside the rotor assembly to cool the stator assembly.

[0048] exist Figures 9 to 11 In the illustrated embodiment, other components and structures of the rotor assembly, as well as other structures of the second guide plate 30 ′, are as described above and will not be described in detail herein.

[0049] Although the present invention has been described with reference to exemplary embodiments, it should be understood that the present invention is not limited to the configurations and methods of the above-described embodiments. On the contrary, the present invention is intended to cover various modifications and equivalent configurations. In addition, although the various elements and method steps of the disclosed utility model are shown in various exemplary combinations and configurations, other combinations including more or fewer elements or methods also fall within the scope of the present invention.

[0050] Reference Signs List

[0051] 1 rotor bracket;

[0052] 2 rotor core;

[0053] 3. Clutch;

[0054] 4 magnet slots;

[0055] 5. Magnet;

[0056] 6 Magnetic Rubber

[0057] 10 rotor bracket;

[0058] 11 cylindrical part;

[0059] 12 oil supply hole;

[0060] 20 rotor core;

[0061] 21 magnet slot;

[0062] 22 cooling channels;

[0063] 30 first guide plate;

[0064] 30' second deflector;

[0065] 30A diversion section;

[0066] 30B non-diversion section;

[0067] 30C inclined surface;

[0068] 40 magnets;

[0069] 50 magnetic glue;

[0070] S first diversion chamber;

[0071] S' second diversion chamber.

Claims

1. A rotor assembly for a motor, characterized in that: include: The rotor support (10) comprises a cylindrical portion (11) extending in the axial direction and a plurality of oil supply holes (12) located on the cylindrical portion (11) and penetrating in the radial direction; A rotor core (20) comprising a plurality of magnet slots (21), wherein at least a portion of the magnet slots (21) forms a cooling channel (22) extending axially through the rotor core (20); and A first guide plate (30) is provided on one axial side of the rotor core (20), The first guide plate (30) and the rotor core (20) both have an annular shape and are both connected to the radial outer surface of the cylindrical portion (11) of the rotor support (10) in a torsionally anti-rotating manner, and The first guide plate (30) is arranged adjacent to the rotor core (20) in the axial direction, and the first guide plate (30) is configured so that the first guide plate (30), the rotor core (20) and the cylindrical portion (11) of the rotor support (10) form a first guide chamber (S), and the first guide chamber (S) is fluidically connected to the oil supply hole (12) and the cooling channel (22) respectively.

2. The rotor assembly according to claim 1, wherein: The rotor assembly further comprises a second guide plate (30') arranged on the other axial side of the rotor core (20). wherein the second guide plate (30') has an annular shape and is connected to the radial outer surface of the cylindrical portion (11) of the rotor support (10) in a torsionally rigid manner, and The second guide plate (30') is arranged adjacent to the rotor core (20) in the axial direction, and the second guide plate (30') is configured so that the second guide plate (30'), the rotor core (20) and the cylindrical portion (11) of the rotor support (10) form a second guide chamber (S'); the second guide chamber (S') is fluidically connected to the oil supply hole (12) and the cooling channel (22), respectively.

3. The rotor assembly according to claim 1, wherein: The first guide plate (30) has an annular truncated cone shape.

4. The rotor assembly according to claim 2, wherein: The first guide plate (30) and the second guide plate (30') respectively include a plurality of guide segments (30A) spaced apart in the circumferential direction, wherein each guide segment (30A) includes an inclined surface (30C) extending obliquely relative to the rotation axis, and the first guide plate (30) and the second guide plate (30') are configured such that the inclined surface (30C), the rotor core (20) and the cylindrical portion (11) of the rotor support (10) respectively form the first guide chamber (S) and the second guide chamber (S').

5. The rotor assembly according to claim 4, wherein: The first flow guiding chamber (S) and the second flow guiding chamber (S') are staggeredly arranged along the circumferential direction.

6. The rotor assembly according to claim 5, characterized in that The first guide plate (30) and the second guide plate (30') have the same shape.

7. The rotor assembly according to any one of claims 1 to 6, characterized in that: The rotor assembly further comprises a plurality of magnets (40), each magnet (40) being disposed in a corresponding magnet slot (21), wherein the cooling channel (22) is disposed radially outside the magnet (40).

8. The rotor assembly according to claim 7, wherein: The rotor assembly further comprises a magnetic glue (50) for fixing the magnet (40), which is arranged in the magnet slot (21) and located radially inside the magnet (40).

9. The rotor assembly according to claim 2, wherein: The first guide plate (30) and / or the second guide plate (30') are configured to be arranged on the radial outer surface of the cylindrical portion (11) of the rotor support (10) by interference fitting.

10. A motor, characterized in that: Comprising a rotor assembly according to any one of claims 1 to 9.

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