Motor rotor and motor

Abstract

The motor rotor comprises a rotor shaft, the rotor shaft is provided with a center hole, an oil guide groove and a rotor shaft oil hole, the oil guide groove is formed in the outer circumferential surface of the rotor shaft, the rotor shaft oil hole penetrates through the circumferential wall of the rotor shaft, and the rotor shaft oil hole is connected with the center hole and the oil guide groove; the rotor shaft is sleeved with the iron core, the iron core is located on the radial outer side of the oil guide groove, the iron core is provided with an iron core oil hole, the iron core oil hole penetrates through the iron core in the axial direction of the rotor, the end plates are connected to the rotor shaft, the two end plates are arranged at the two axial ends of the iron core respectively, and the end plate located at the other axial end of the iron core is provided with a channel. The oil guide groove is communicated with the iron core oil hole through the channel.

Description

TECHNICAL FIELD

[0001] The application relates to a motor rotor and a motor. BACKGROUND

[0002] The cooling system of the motor is usually mainly concentrated on the motor stator, however, with the increasing need for continuous output power of the motor, the harmonic loss of the motor rotor caused by pulse voltage is high, and therefore the cooling of the motor rotor is gradually important.

[0003] The utility model patent CN207652160U discloses an electric motor, a spiral-shaped coolant channel is formed between the rotor shaft and the iron core, however, since the contact area between the rotor shaft and the iron core is small, the heat transfer capacity is limited, and it is difficult to greatly improve the continuous power of the electric motor.

[0004] The patent application CN115589091A discloses an oil cooling structure of a permanent magnet motor rotor, the peripheral surface of the rotor shaft is provided with an oil outlet hole, the oil flows into one end of the rotor shaft and flows out from the other end of the rotor shaft, and some oil is sprayed into the iron core from the oil outlet hole. However, the oil flowing into the iron core has no outlet and cannot form a circulating convection. When the oil is in a static state, the cooling effect on the motor is limited.

[0005] The patent application CN116961284A discloses an oil-cooled hollow rotating shaft structure, the oil hole can flow through the inside of the rotor shaft, but the outer surface of the rotor shaft and the iron core cannot be fully cooled.

[0006] The patent application CN113437820A discloses a hub motor and a hub motor cooling system, the outer peripheral surface of the rotor shaft is provided with a spiral channel, and the cooling water can flow along the channel, which cannot cool the inside of the iron core, and the cooling effect is poor. SUMMARY

[0007] The application aims to provide a motor rotor with good cooling effect.

[0008] The embodiments of the application provide a motor rotor, which comprises:

[0009] A rotor shaft, the rotor shaft has a central hole, an oil guide groove and a rotor shaft oil hole, the oil guide groove is arranged on the outer peripheral surface of the rotor shaft, the rotor shaft oil hole penetrates the peripheral wall of the rotor shaft, and the rotor shaft oil hole is connected with the central hole and the oil guide groove;

[0010] An iron core, the iron core is sleeved on the rotor shaft, the iron core is located on the radially outer side of the oil guide groove, the iron core is provided with an iron core oil hole, the iron core oil hole penetrates the iron core in the axial direction of the rotor, and

[0011] Two end plates are connected to the rotor shaft, and are arranged at axial two ends of the iron core respectively, the end plate arranged at the axial other end of the iron core is provided with a passage, and the passage communicates the oil guide groove and the iron core oil hole.

[0012] In at least one possible implementation, the oil guide groove comprises a ring groove and a cooling groove, the ring groove extends along the circumference of the rotor shaft, the cooling groove and the ring groove communicate, the ring groove is located at an axial one end of the cooling groove, and the rotor shaft oil hole is connected to the ring groove.

[0013] In at least one possible implementation, the cooling groove is provided with one or more grooves, and the cooling groove is directly connected to the ring groove.

[0014] In at least one possible implementation, the oil guide groove extends along a spiral line.

[0015] In at least one possible implementation, the oil guide groove extends along an axial straight line of the rotor shaft.

[0016] In at least one possible implementation, the rotor shaft oil hole and the passage are arranged at axial two ends of the oil guide groove respectively.

[0017] In at least one possible implementation, the oil guide groove and the iron core are located at the same position in the axial direction of the rotor.

[0018] In at least one possible implementation, the end plate arranged at an axial one end of the iron core is provided with an oil outlet hole, the oil outlet hole and the iron core oil hole communicate, and the oil outlet hole axially penetrates the end plate arranged at the axial one end of the iron core.

[0019] In at least one possible implementation, the passage comprises a radial passage and a circumferential passage, the radial passage and the circumferential passage are connected, the radial passage extends along the radial direction of the rotor, the circumferential passage extends along the circumferential direction of the rotor, the radial passage and the oil guide groove communicate, and the circumferential passage and the iron core oil hole communicate.

[0020] The embodiments of the present application also provide an electric machine, which comprises the electric machine rotor according to any one of the above technical solutions.

[0021] By adopting the above technical solutions, the contact area between the rotor shaft and the iron core can be cooled by forming the oil guide groove between the rotor shaft and the iron core, and the oil guide groove and the iron core oil hole communicate, so that the oil liquid can circulate and flow, thereby achieving a better cooling effect of the electric machine rotor. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1A schematic diagram showing a partial structure of a motor according to the first embodiment of the present application is shown.

[0023] Figure 2 A sectional view of a rotor of a motor according to the first embodiment of the present application is shown.

[0024] Figure 3 A structural schematic diagram of a rotor shaft of a rotor of a motor according to the first embodiment of the present application is shown.

[0025] Figure 4 A sectional view of a partial structure of a motor according to the first embodiment of the present application is shown.

[0026] Figure 5 A structural schematic diagram of an internal flow passage of a rotor of a motor according to the first embodiment of the present application is shown.

[0027] Figure 6 A structural schematic diagram of a rotor shaft of a rotor of a motor according to the second embodiment of the present application is shown.

[0028] Figure 7 A structural schematic diagram of a rotor shaft of a rotor of a motor according to the third embodiment of the present application is shown.

[0029] Figure 8 A front view of a rotor shaft of a rotor of a motor according to the third embodiment of the present application is shown.

[0030] Figure 9 A schematic diagram showing a partial structure of a rotor of a motor according to the third embodiment of the present application is shown.

[0031] Figure 10 A structural schematic diagram of a rotor shaft of a rotor of a motor according to the fourth embodiment of the present application is shown.

[0032] Figure 11 A front view of a rotor shaft of a rotor of a motor according to the fourth embodiment of the present application is shown.

[0033] BRIEF DESCRIPTION OF THE DRAWINGS

[0034] 100 rotor

[0035] 1 rotor shaft 11 central hole 12 oil guide groove 13 rotor shaft oil hole

[0036] 2 core 21 magnet steel mounting hole 22 core oil hole

[0037] 3 end plate 3A first end plate 3B second end plate 31 passage 311 radial passage 312

[0038] circumferential passage

[0039] A axial C circumferential. DETAILED DESCRIPTION

[0040] In order to more clearly illustrate the above-mentioned purposes, features and advantages of the present application, a specific embodiment of the present application is described in detail in this section in conjunction with the accompanying drawings. In addition to the various embodiments described in this section, the present application can be implemented in other different ways, and those skilled in the art can make corresponding improvements, modifications and substitutions without departing from the spirit of the present application, so the present application is not limited to the specific embodiments disclosed in this section. The scope of protection of the present application should be subject to the claims.

[0041] (First embodiment)

[0042] As shown in Figures 1 to 5 , the first embodiment of the present application proposes an electric machine, the electric machine comprising a stator and a rotor 100, the stator can be arranged radially outward of the rotor. The rotor 100 comprises a rotor shaft 1, a core 2 and an end plate 3, the core 2 and the end plate 3 are sleeved on the rotor shaft 1, and the core 2 and the end plate 3 can rotate together with the rotor shaft 1. The end plate 3 can be arranged at the axial both ends of the core 2.

[0043] The core 2 can be provided with a magnetic steel mounting hole 21 for mounting a magnetic steel, the magnetic steel mounting hole 21 can penetrate the core 2 along the axial direction A of the rotor 100, and the magnetic steel mounting hole 21 can be provided with a plurality of groups along the circumferential direction C of the rotor 100.

[0044] The core 2 can also be provided with a core oil hole 22, the core oil hole 22 can be arranged beside the magnetic steel mounting hole 21, for example, the core oil hole 22 can be located between two adjacent groups of magnetic steel mounting holes 21. The core oil hole 22 can be provided with a plurality of core oil holes 22, and the plurality of core oil holes 22 can be arranged along the circumferential direction C of the rotor 100.

[0045] The rotor shaft 1 can be provided with a central hole 11, the central hole 11 can extend along the axial direction A of the rotor shaft 1, and the central hole 11 can be a through hole or a blind hole. The oil used for cooling the rotor 100 can flow in from the central hole 11.

[0046] The outer circumferential surface of the rotor shaft 1 can be provided with an oil guide groove 12 and a rotor shaft oil hole 13, the rotor shaft oil hole 13 penetrates the peripheral wall of the rotor shaft 1, and the rotor shaft oil hole 13 can be arranged in the oil guide groove 12, so that the oil in the central hole 11 can flow to the oil guide groove 12 through the rotor shaft oil hole 13. The rotor shaft oil hole 13 can be located at one end of the oil guide groove 12 (the left end in the figure). Figure 3 、 Figure 5

[0047] ​In the axial direction A of the rotor 100, the oil guide groove 12 and the core 2 can be located at the same position, i.e., the oil guide groove 12 and the core 2 are at the same axial position, and the oil flowing through the oil guide groove 12 can contact the inner circumferential surface of the core 2, so that the inner circumferential portion of the core 2 has a good cooling effect.

[0048] As shown in Figure 3 , the oil guide groove 12 can extend along a spiral line, so that the oil guide groove 12 and the core 2 can have more overlapping areas, thereby increasing the contact area between the oil and the inner circumferential surface of the core 2, making the heat transfer area of the core 2 larger, and the cooling effect of the core 2 better, so that the motor can continuously operate at high power.

[0049] Optionally, the oil guide groove 12 can be formed by milling.

[0050] The end plate 3 includes a first end plate 3A and a second end plate 3B, and the first end plate 3A and the second end plate 3B are respectively arranged at the axial ends of the core 2. In the axial direction A of the rotor 100, the first end plate 3A can be located at one end of the axial direction close to the rotor shaft oil hole 13, and the second end plate 3B can be located at the other end of the axial direction away from the rotor shaft oil hole 13. The second end plate 3B can be provided with a passage 31, and the passage 31 can communicate the other end of the oil guide groove 12 with the core oil hole 22.

[0051] The first end plate 3A can be provided with an oil outlet hole 32, and the oil outlet hole 32 and the core oil hole 22 are in communication, and the oil outlet hole 32 can penetrate the first end plate 3A along the axial direction A, so that the oil flowing through the core 2 can flow out through the oil outlet hole 32.

[0052] Optionally, the passage 31 includes a radial passage 311 and a circumferential passage 312, and the radial passage 311 and the circumferential passage 312 are connected, the radial passage 311 can extend along the radial direction R of the rotor 100, and the circumferential passage 312 can extend along the circumferential direction C of the rotor 100. The radial passage 311 can communicate with the oil guide groove 12, and the circumferential passage 32 can communicate with the plurality of core oil holes 22. The oil in the oil guide groove 12 can be supplied to the plurality of core oil holes 22 through the radial passage 311 and the circumferential passage 312, so as to cool the core 2 by the oil.

[0053] In Figure 4 and Figure 5 , the entity represents the oil channel or hole, Figure 2 and Figure 5 , the one-way arrow represents the flow direction of the oil.

[0054] Referring to Figure 2 , Figure 4 and Figure 5 , the oil entering the central hole 11 flows to the oil guide groove 12 through the rotor shaft oil hole 13, and the oil in the oil guide groove 12 flows to the core oil hole 22 from one end of the core 2 in the axial direction A Figure 2to the other axial end (the right end in FIG. 1) of the motor. Figure 2 to the other axial end (the right end in FIG. 1) of the motor. Figure 2 to the other axial end (the right end in FIG. 1) of the motor. Figure 2 to the other axial end (the left end in FIG. 1) of the motor.

[0055] (Second Embodiment)

[0056] As shown in FIG. 2, the second embodiment of the present application proposes a motor including a stator and a rotor 100. The rotor 100 includes a rotor shaft 1, a core 2, and an end plate 3 (part of the structure can refer to the first embodiment). Figure 6 The motor of the second embodiment of the present application and the motor of the first embodiment of the present application differ in the rotor shaft, and the same reference numerals are used to indicate the same or similar components in the second embodiment and the first embodiment.

[0057] The oil guide groove 12 of the rotor shaft 1 can extend linearly along the axial direction A of the rotor shaft 1.

[0058] Here, the rotor shaft oil hole 13 and / or the oil guide groove 12 can be one or more.

[0059] (Third Embodiment)

[0060] As shown in FIG. 3, the third embodiment of the present application proposes a motor including a stator and a rotor 100. The rotor 100 includes a rotor shaft 1, a core 2, and an end plate 3 (part of the structure can refer to the first embodiment).

[0061] Figures 7 to 9 The motor of the third embodiment of the present application and the motor of the second embodiment of the present application differ in the rotor shaft, and the same reference numerals are used to indicate the same or similar components in the third embodiment and the second embodiment.

[0062] The oil guide groove 12 can include a ring groove 121 and a cooling groove 122, the ring groove 121 can extend along the circumferential direction C of the rotor shaft 1, and the cooling groove 122 can extend linearly along the axial direction A of the rotor shaft 1. The cooling groove 122 can be provided with a plurality of cooling grooves 122 along the circumferential direction C of the rotor shaft 1, and the ring groove 12 can be provided at the axial one end (the left end in FIG. 3) of the cooling groove 122.

[0063] The oil guide groove 12 can include a ring groove 121 and a cooling groove 122, the ring groove 121 can extend along the circumferential direction C of the rotor shaft 1, and the cooling groove 122 can extend linearly along the axial direction A of the rotor shaft 1. The cooling groove 122 can be provided with a plurality of cooling grooves 122 along the circumferential direction C of the rotor shaft 1, and the ring groove 12 can be provided at the axial one end (the left end in FIG. 3) of the cooling groove 122. Figures 6 to 9 ​The plurality of cooling grooves 122 are in communication with the annular groove 121. The rotor shaft oil hole 13 can be connected to the annular groove 121. By providing the plurality of cooling grooves 122, the cooling grooves 122 and the core 2 can have more overlapping areas, thereby increasing the contact area between the oil and the inner circumferential surface of the core 2, increasing the heat transfer area of the core 2, and improving the cooling effect of the core 2, so that the motor can continuously operate at high power.

[0064] Figure 9 The single arrow in the direction of oil flow.

[0065] Referring to Figure 9 , the oil flowing into the central hole 11 flows through the rotor shaft oil hole 13 to the annular groove 121, and then flows through the annular groove 121 to the plurality of cooling grooves 122. The oil flows from one axial end of the core 2 (left end in Figure 9 ) to the other axial end (right end in Figure 9 ) of the core 2. Then the oil flows through the radial passage 311 and the circumferential passage 312 of the end plate 3 to the core oil hole 22 of the core, and the oil flows from the other axial end (right end in Figure 2 ) of the core 2 to the one axial end (left end in Figure 2 ) of the core 2 along the axial direction A of the motor in the core oil hole 22, so that the oil in the oil guide groove 12 and the core oil hole 22 can circulate, and the cooling effect is good.

[0066] (Fourth Embodiment)

[0067] As shown in Figure 10 and Figure 11 , the fourth embodiment of the present application provides a motor, which includes a stator and a rotor 100. The rotor 100 includes a rotor shaft 1, a core 2 and an end plate 3 (part of the structure can refer to the first embodiment).

[0068] The difference between the motor of the fourth embodiment of the present application and the motor of the third embodiment of the present application includes the rotor shaft. The same reference numerals are used to indicate the same or similar parts in the fourth embodiment and the third embodiment.

[0069] The cooling groove 122 of the rotor shaft 1 can extend along a spiral line. In this embodiment, one cooling groove 122 is provided. In other possible embodiments, a plurality of cooling grooves 122 extending along a spiral line can be provided, and the annular groove 121 is in communication with the plurality of cooling grooves 122.

[0070] In one non-limiting example, a plurality of rotor shaft oil holes 13 can be provided.

[0071] It should be understood that at least some aspects or features of the above-mentioned embodiments, examples or examples can be appropriately combined.

[0072] It can be understood that, in the present application, the number of components or members is one or more when the number of components or members is not particularly limited, and the plurality herein refers to two or more. For the case where the number of components or members is specifically described as, for example, two, three, four, etc. in the drawings and / or the description, the specific number is generally exemplary and not restrictive, and it can be understood as a plurality, i.e., two or more, but this does not mean that the present application excludes the case of one.

[0073] In the present application, unless otherwise explicitly stated or limited, the terms "mounting", "assembling", "assembly", "connecting", "connection", "coupling", "linking", "abutting", "communicating", "communicating", "conducting", "fixing", "fastening", and the like should be understood in a broad sense, for example, they can be direct or indirect. For example, in terms of connection, it can be a fixed connection, or a detachable connection, or integrated; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly stated or limited. For example, in terms of communication / conduction, etc., it can be direct communication / conduction, or indirect communication / conduction via an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0074] In the present application, unless otherwise explicitly stated or limited, one member is disposed in / installed in / located in / contained in / placed in another member, etc. can be any of the following two cases: a part or most of the one member is located in the other member; and the one member is completely contained in the other member.

[0075] Although the present application has been described in detail using the above embodiments, it is clear to those skilled in the art that the present application is not limited to the embodiments described in the present specification. The present application can be modified and implemented as a modified embodiment without departing from the spirit and scope of the present application defined by the claims. Therefore, the description in the present specification is for the purpose of illustration and does not have any limiting meaning on the present application.

Claims

1. An electric machine rotor, characterized in that, The motor rotor comprises: a rotor shaft having a central hole, an oil guide groove arranged on an outer circumferential surface of the rotor shaft, and a rotor shaft oil hole penetrating a circumferential wall of the rotor shaft and connecting the central hole and the oil guide groove; an iron core sleeved on the rotor shaft, located radially outside the oil guide groove, and provided with an iron core oil hole penetrating the iron core in an axial direction of the rotor; and two end plates connected to the rotor shaft and arranged respectively at axial two ends of the iron core, wherein the end plate located at an axial other end of the iron core is provided with a passage for connecting the oil guide groove and the iron core oil hole.

2. The electric machine rotor of claim 1, wherein, The oil guide groove comprises a ring groove extending in a circumferential direction of the rotor shaft and a cooling groove connected to the ring groove, wherein the ring groove is located at an axial one end of the cooling groove, and the rotor shaft oil hole is connected to the ring groove.

3. The motor rotor of claim 2, wherein, The cooling groove is provided with one or more cooling grooves directly connected to the ring groove.

4. The motor rotor of claim 1, wherein The oil guide groove extends along a helix.

5. The motor rotor of claim 1, wherein, The oil guide groove extends linearly in an axial direction of the rotor shaft.

6. The motor rotor of claim 1, wherein The rotor shaft oil hole and the passage are arranged respectively at axial two ends of the oil guide groove.

7. The motor rotor of claim 1, wherein In an axial direction of the rotor, the oil guide groove and the iron core are located at the same position.

8. The motor rotor of claim 1, wherein, The end plate located at the axial one end of the iron core is provided with an oil outlet hole axially penetrating the end plate located at the axial one end of the iron core, wherein the oil outlet hole is connected to the iron core oil hole.

9. The motor rotor of claim 1, wherein, The passage comprises a radial passage and a circumferential passage connected to each other, wherein the radial passage extends in a radial direction of the rotor, the circumferential passage extends in a circumferential direction of the rotor, the radial passage is connected to the oil guide groove, and the circumferential passage is connected to the iron core oil hole.

10. An electric machine characterized by The motor comprises the motor rotor according to any one of claims 1 to 9.

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