Electric motor rotor, electric motor and vehicle power system

Abstract

Provided is an electric motor rotor, comprising: a rotor lamination (1); two balance disks (2), which are respectively arranged at two axial ends of the rotor lamination (1), and which each are provided with a heat pipe holding hole (21); and a plurality of heat pipes (3), which are arranged in a circumferential direction (C) of the electric motor, and which each comprise a shell (33) and a wick (34), wherein the wick (34) is arranged on a radial inner side of the shell (33), and the heat pipes (3) each are provided with an evaporation section (31) and a condensation section (32), the evaporation sections (31) being connected to the condensation sections (32), the evaporation sections (31) being inserted into the rotor lamination (1), and the condensation sections (32) being embedded into the heat pipe holding holes (21). Further provided are an electric motor and a vehicle power system.

Description

Motor rotor, motor and vehicle power system Technical Field

[0001] The present application relates to a motor rotor, a motor, and a vehicle power system. Background Art

[0002] A heat pipe typically consists of a shell, a wick, and end caps. The interior of the heat pipe is pumped into a negative pressure state and filled with a suitable liquid with a low boiling point and easy volatility. The tube wall is provided with a wick made of a capillary porous material. One end of the heat pipe is the evaporation section, and the other end is the condensation section. When the evaporation section of the heat pipe is heated, the liquid in the capillary tube rapidly vaporizes. The vapor flows to the condensation section under the power of thermal diffusion and condenses at the cold end, releasing heat and liquefying into liquid. The liquid then flows back to the evaporation section along the porous material by capillary action (capillary force). In this cycle, heat can be continuously transferred from the evaporation section to the condensation section.

[0003] Heat pipes are increasingly used in electric motors due to their good thermal conductivity.

[0004] Patent application CN114785051A discloses a heat pipe cooling structure and motor for a permanent magnet motor, in which a heat pipe is installed in a rotor shaft, a condensing section of the heat pipe extends from a motor housing, and a heat sink is provided in the condensing section to increase the heat dissipation area.

[0005] However, only a single heat pipe can be installed in the rotor shaft, which has limited heat dissipation capacity. In addition, the heat sink connected to the condensing section increases the number, weight and cost of parts, making the motor occupy a larger space. In addition, the heat sink is not strong enough when rotating at high speeds and is prone to failure.

[0006] Patent CN211720429U discloses a motor based on heat pipe cooling, in which a fan is provided at one end of the rotor shaft, and the heat absorbed by the heat pipe can be taken away by the fan.

[0007] However, the fan occupies a large space in the motor. Furthermore, since the hollow rotor shaft with the heat pipe installed is difficult to install a half shaft, the above motor is difficult to use in a coaxial vehicle power system.

[0008] Summary of the Invention

[0009] The purpose of the present application is to overcome or at least alleviate the deficiencies of the above-mentioned prior art and to provide a motor rotor that can achieve better heat dissipation effect and smaller axial volume of the motor rotor.

[0010] An embodiment of the present application provides a motor rotor, comprising:

[0011] rotor laminations;

[0012] Two balancing disks, the two balancing disks being respectively arranged at the axial ends of the rotor lamination, the balancing disks being provided with heat pipe holding holes; and

[0013] A plurality of heat pipes are arranged along the circumference of the motor, the heat pipes comprising a shell and a liquid wick, the liquid wick being arranged radially inward of the shell, the heat pipes comprising an evaporation section and a condensation section, the evaporation section and the condensation section being connected,

[0014] The evaporation section is inserted into the interior of the rotor lamination, and the condensation section is embedded in the heat pipe holding hole.

[0015] In at least one possible embodiment, the heat pipe includes a first heat pipe and a second heat pipe.

[0016] The condensing section of the first heat pipe is exposed from the balancing disk at one axial end of the motor rotor.

[0017] The condensing section of the second heat pipe is exposed from the balancing disk at the other axial end of the motor rotor.

[0018] In at least one possible implementation manner, the first heat pipes and the second heat pipes are alternately arranged in a circumferential direction of the motor.

[0019] In at least one possible implementation manner, the evaporation section extends along the axial direction of the motor, and the condensation section and the evaporation section form an angle, and the angle is 135 degrees to 180 degrees.

[0020] In at least one possible embodiment, the inner circumferential surface of the shell is a conical surface, and the closer to the condensation section, the smaller the inner diameter of the shell.

[0021] In at least one possible embodiment, the inner wall surface of the shell is provided with a plurality of grooves extending along the axial direction of the heat pipe, and the plurality of grooves are arranged along the circumference of the heat pipe.

[0022] In at least one possible embodiment, the length of the heat pipe inserted into the rotor lamination is greater than half of the axial length of the rotor lamination.

[0023] In at least one possible implementation manner, the condensing section is fixed to the heat pipe holding hole by bonding with a thermally conductive adhesive, and protrudes from an end surface of the balancing plate.

[0024] An embodiment of the present application further provides a motor, which includes the motor rotor according to any one of the above technical solutions.

[0025] An embodiment of the present application further provides a vehicle power system, which includes the motor rotor according to any one of the above technical solutions.

[0026] By adopting the above technical solution, the motor stator of the present application can obtain at least one of the following beneficial effects.

[0027] (1) Multiple heat pipes inserted into the rotor laminations can transfer the internal heat of the motor rotor to the air, thereby improving the heat dissipation effect of the motor rotor. In addition, the heat pipes do not need to be connected to the heat sink, which reduces the axial volume of the motor rotor.

[0028] (2) The first heat pipe and the second heat pipe are alternately arranged in the circumferential direction of the motor, so that the heat exchange area between the condensation section and the balancing disk is larger, the heat dissipation is uniform, and the two balancing disks at both ends of the axial direction have the same structure, which reduces the mold cost of the balancing disk.

[0029] (3) There is no need to set up an additional fan for active heat dissipation, which makes the motor smaller and has a better heat dissipation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] FIG1 shows a schematic structural diagram of a motor rotor according to an embodiment of the present application.

[0031] FIG2 shows another schematic structural diagram of a motor rotor according to an embodiment of the present application.

[0032] FIG3 shows a cross-sectional view of a vehicle power system according to an embodiment of the present application.

[0033] FIG4 shows an exploded view of a motor rotor according to an embodiment of the present application.

[0034] FIG5 shows a schematic structural diagram of a balancing disk of a motor rotor according to an embodiment of the present application.

[0035] FIG6 shows another schematic structural diagram of a balancing disk of a motor rotor according to an embodiment of the present application.

[0036] FIG7 shows a cross-sectional view of a balancing disk of a motor rotor according to an embodiment of the present application.

[0037] FIG8 shows another cross-sectional view of a balancing disk of a motor rotor according to an embodiment of the present application.

[0038] FIG9 shows a schematic structural diagram of a heat pipe of a motor rotor according to an embodiment of the present application.

[0039] FIG. 10 shows a cross section of a heat pipe of a motor rotor according to an embodiment of the present application. DETAILED DESCRIPTION

[0040] In order to more clearly illustrate the above-mentioned purposes, features and advantages of the present application, this section describes in detail the specific embodiments of the present application in conjunction with the accompanying drawings. In addition to the various embodiments described in this section, the present application can also be implemented in other different ways. Without violating the spirit of the present application, those skilled in the art can make corresponding improvements, deformations and substitutions. Therefore, the present application is not limited to the specific embodiments disclosed in this section. The scope of protection of this application shall be based on the claims.

[0041] Exemplary embodiments of the present application are described below with reference to the accompanying drawings.

[0042] As shown in FIG. 1 to FIG. 10 , an embodiment of the present application provides a vehicle power system, which can be applied to a pure electric vehicle or a hybrid electric vehicle.

[0043] The vehicle power system includes a motor, which includes a motor rotor 100 and a motor stator 200. For example, the motor stator 200 may be disposed radially outside the motor rotor 100. The vehicle power system may further include a gearbox and the like.

[0044] As shown in Figures 1 to 4, the motor rotor 100 may include a rotor lamination 1, a balancing disk 2, a heat pipe 3, and a rotor shaft 4. The rotor lamination 1 and the balancing disk 2 are both sleeved onto the rotor shaft 4, which may be hollow or solid. Two balancing disks 2 may be provided, one at each axial end of the rotor lamination 1. The heat pipe 3 may be partially inserted into the rotor lamination 1 and the balancing disk 2.

[0045] As shown in Figures 4 and 9 , the heat pipe 3 can have a circular cross-section. Multiple heat pipes 3 can be provided, and these multiple heat pipes 3 can be arranged radially outward of the rotor shaft 4 along the circumferential direction C of the motor rotor 100. The heat pipe 3 includes an evaporation section 31 and a condensation section 32 . The evaporation section 31 and the condensation section 32 are connected, and the evaporation section 31 can extend along the axial direction A of the motor. The condensation section 32 and the evaporation section 31 can form an angle ranging from 135 to 180 degrees. Under the influence of centrifugal force and capillary action, liquid in the condensation section 32 can flow toward the evaporation section.

[0046] The rotor laminations 1 may be provided with a plurality of heat pipe insertion holes, which may penetrate the rotor laminations 1 along the axial direction A of the rotor laminations 1 and may be circular holes. The plurality of heat pipe insertion holes may be arranged along the circumferential direction C of the motor rotor 100 .

[0047] As shown in FIG. 5 to FIG. 8 , the balancing plate 2 may be provided with a heat pipe holding hole 21 , and the heat pipe holding hole 21 may be a long hole.

[0048] The evaporation section 31 of the heat pipe 3 can be blocked by the balancing plate 2 so that the evaporation section 31 is not exposed to the air, and the condensation section 32 of the heat pipe 3 can be at least partially embedded in the heat pipe holding hole 21 of the balancing plate 2, thereby holding and limiting the evaporation section 31 of the heat pipe 3 and preventing the heat pipe 3 from rotating.

[0049] The condensing section 32 may protrude a certain height from the end surface of the balancing disk 2, acting like a fan blade. When the motor rotor 100 rotates, the condensing section 32 protruding from the balancing disk 2 stirs the air around the balancing disk 2, promoting air flow. This allows the exposed condensing section 32 to rapidly dissipate heat through air convection, rapidly condensing the coolant in the heat pipe 3 into liquid.

[0050] Optionally, the contact area between the condenser section 32 and the balancing plate 2 can be bonded using a thermally conductive adhesive, such as a high-thermal-conductivity epoxy adhesive. The heat pipe retaining hole 21 and the condenser section 32 can be coated with a high-thermal-conductivity epoxy adhesive. This high-thermal-conductivity epoxy adhesive not only transfers heat from the condenser section 32 to the balancing plate 2, but also secures the heat pipe 3 to the balancing plate 2.

[0051] As shown in Figures 3 and 4, the length of the heat pipe 3 inserted into the rotor lamination 1 is greater than half of the axial length of the rotor lamination 1, so that the heat pipe 3 can fully absorb the heat of the rotor lamination 1. In this embodiment, the heat pipe 3 can extend from one axial end of the rotor lamination 1 to the other axial end.

[0052] Furthermore, the heat pipe 3 may include a first heat pipe 3A and a second heat pipe 3B, wherein the condensing section 32 of the first heat pipe 3A and the condensing section 32 of the second heat pipe 3B face in opposite directions. The evaporating section 31 of the first heat pipe 3A and the evaporating section 31 of the second heat pipe 3B may be respectively inserted into the rotor lamination 1 from both ends of the rotor lamination 1. The condensing section 32 of the first heat pipe 3A may be located at one axial end of the rotor lamination 1 (the left end in FIG. 4 ), and the condensing section 32 of the second heat pipe 3B may be located at the other axial end of the rotor lamination 1 (the right end in FIG. 4 ). In this way, the motor rotor 100 can dissipate heat using the two balancing disks 2 at both axial ends, so that the heat dissipation effect at both axial ends of the motor rotor 100 is roughly the same.

[0053] The first heat pipes 3A and the second heat pipes 3B are arranged alternately in the circumferential direction C of the motor, allowing the condensing sections 32 of the first heat pipes 3A and the second heat pipes 3B to be exposed from the two balancing disks 2 at the axial ends of the motor rotor 100, respectively, for uniform heat dissipation. This also increases the heat exchange area between the condensing sections 32 and the balancing disks 2, improving the heat transfer effect of the heat pipes. Furthermore, this also allows the two balancing disks 2 at the axial ends of the motor rotor 100 to have the same structure. Using two balancing disks 2 with the same structure can reduce the mold cost of the balancing disks 2, thereby reducing the production cost of the motor.

[0054] As shown in Figure 9, the heat pipe 3 may include a housing 33 and a wick 34, which is disposed radially inward of the housing 33. The inner circumferential surface of the housing 33 may be conical, with the inner diameter of the housing 33 decreasing as it approaches the condensing section 32. As the motor rotor 100 rotates, the centrifugal force of the liquid can be decomposed into a force component parallel to the conical surface, thereby prompting the liquid (coolant) to flow rapidly along the conical surface of the housing 33 from the condensing section 32 to the evaporating section 31, thereby facilitating heat transfer.

[0055] Furthermore, referring to FIG10 , the inner wall of the housing 33 may be provided with a groove 331 extending axially along the heat pipe 3. Multiple grooves 331 may be provided, and the multiple grooves 331 may be arranged circumferentially along the heat pipe 3. The grooves 331 are narrow and can form capillaries. These grooves 331 prevent the liquid (coolant) from flowing circumferentially along the housing 33 under the action of centrifugal force. The liquid (coolant) can flow from the condensing section 32 to the evaporating section 31 along the wall of the grooves 331, facilitating liquid (coolant) backflow. Optionally, the cross-sectional shape of the grooves 331 may be trapezoidal.

[0056] The motor of the present application utilizes the evaporation section 31 of the heat pipe 3 to absorb heat from the rotor laminations 1, causing the coolant in the heat pipe 3 to evaporate and form steam. The steam then flows from the center of the heat pipe 3 to the condensation section 32, where the coolant cools and condenses into a liquid. The liquid then flows back to the evaporation section 31 along the inner wall of the housing 33. The circulation of the coolant in the heat pipe 3 transfers heat from the motor rotor 100 to the air outside the motor rotor 100, where the heat can be passively dissipated through the motor housing.

[0057] The motor rotor, motor, and bridge drive system of the present application can have the following beneficial effects.

[0058] (1) The multiple heat pipes 3 inserted into the rotor laminations 1 can transfer the internal heat of the motor rotor 100 to the air, so that the heat dissipation effect of the motor rotor 100 is better, and the heat pipes 3 are not connected to the heat sink, so that the axial volume of the motor rotor is smaller.

[0059] (2) The first heat pipe 3A and the second heat pipe 3B are alternately arranged in the circumferential direction C of the motor, so that the heat exchange area between the condensation section 32 and the balancing disk 2 is larger, the heat dissipation is uniform, and the two balancing disks 2 at the axial ends have the same structure, which reduces the mold cost of the balancing disk 2.

[0060] (3) There is no need to set up an additional fan for active heat dissipation, which makes the motor smaller and has a better heat dissipation effect.

[0061] Of course, the present application is not limited to the above embodiments. Those skilled in the art can make various modifications to the above embodiments of the present application under the guidance of the present application without departing from the scope of the present application.

[0062] (1) In the above embodiment, the heat pipe 3 includes a first heat pipe 3A and a second heat pipe 3B respectively inserted into the rotor laminations from both axial ends of the rotor. However, in other possible embodiments, the heat pipe may be inserted into the rotor laminations from only one axial end of the rotor.

[0063] (2) It is understood that the absorbent core can adopt materials and / or structures with good liquid absorption capabilities in the prior art.

[0064] (3) In the above embodiment, the cross-sectional shape of the groove 331 may be a trapezoid, however, the present application is not limited thereto, and the cross-sectional shape of the groove may also be a rectangle, a triangle, etc.

[0065] It should be understood that at least some aspects or features of the above-mentioned embodiments, examples or examples may be appropriately combined.

[0066] It is understood that in this application, when the number of parts or components is not specifically limited, the number may be one or more, and the term "plurality" herein refers to two or more. Where the number of parts or components is shown in the drawings and / or described in the specification as a specific number, such as two, three, or four, the specific number is generally illustrative and not restrictive, and may be understood as a plurality, i.e., two or more. However, this does not mean that this application excludes the case of one.

[0067] In this application, unless otherwise clearly stated or limited, terms such as "install", "assemble", "connect", "connect", "couple", "link", "abut", "connect", "interconnect", "communicate", "conduct", "fix", "fasten", etc. should be understood in a broad sense, for example, they can be direct or indirect. For example, with respect to connection, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly stated or limited. For example, with respect to connectivity / conduction, it can be direct connectivity / conduction or indirect connectivity / conduction through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0068] In the present application, unless otherwise clearly stated or limited, a component provided on / installed on / located on / accommodated on / placed in, within, inside, etc. another component may be any of the following two situations: a part or most of the one component is located in the other component; and the one component is completely accommodated in the other component.

[0069] While the present application has been described in detail using the above-described embodiments, it will be apparent to those skilled in the art that the present application is not limited to the embodiments described in this specification. The present application can be modified and implemented as modified embodiments without departing from the subject matter and scope of the present application as defined by the claims. Therefore, the descriptions in this specification are for illustrative purposes only and do not have any limiting meaning with respect to the present application.

[0070] Reference Signs List

[0071] 100 motor rotor 200 motor stator

[0072] 1 rotor laminations

[0073] 2Balance plate 21Heat pipe holding hole

[0074] 3 heat pipe 31 evaporation section 32 condensation section 33 shell 331 groove 34 liquid absorption core

[0075] 4 rotor shaft

[0076] A is axial and C is circumferential.

Claims

1. A motor rotor, comprising: a rotor lamination (1); two balance discs (2), the two balance discs (2) are respectively arranged at two axial ends of the rotor lamination (1), and the balance disc (2) is provided with a heat pipe holding hole (21); and a plurality of heat pipes (3), the plurality of heat pipes (3) are arranged along the circumferential direction (C) of the motor, the heat pipe (3) comprises a housing (33) and a wick (34), the wick (34) is arranged on the radially inner side of the housing (33), the heat pipe (3) has an evaporation section (31) and a condensation section (32), and the evaporation section (31) and the condensation section (32) are connected; the evaporation section (31) is inserted into the interior of the rotor lamination (1), and the condensation section (32) is embedded in the heat pipe holding hole (21).

2. The motor rotor according to claim 1, characterized in that, The heat pipe (3) comprises a first heat pipe (3A) and a second heat pipe (3B); the condensation section (32) of the first heat pipe (3A) is exposed from the balance disc (2) at one axial end of the motor rotor (100); the condensation section (32) of the second heat pipe (3B) is exposed from the balance disc (2) at the other axial end of the motor rotor (100).

3. The motor rotor according to claim 2, characterized in that, The first heat pipe (3A) and the second heat pipe (3B) are alternately arranged in the circumferential direction (C) of the motor.

4. The motor rotor according to claim 1, characterized in that, The evaporation section (31) extends along the axial direction (A) of the motor, the condensation section (32) and the evaporation section (31) form an included angle, and the angle of the included angle is 135 degrees to 180 degrees.

5. The motor rotor according to claim 1, characterized in that, The inner circumferential surface of the housing (33) is a conical surface, and the inner diameter of the housing (33) is smaller closer to the condensation section (32).

6. The motor rotor according to claim 1, characterized in that, The inner wall surface of the housing (33) is provided with a plurality of grooves (331) extending along the axial direction of the heat pipe (3), and the plurality of grooves (331) are arranged along the circumferential direction of the heat pipe (3).

7. The motor rotor according to claim 1, characterized in that, The length of the heat pipe (3) inserted into the rotor lamination (1) is greater than half of the axial length of the rotor lamination (1).

8. The motor according to claim 1, characterized in that, The condensation section (32) is adhesively fixed to the heat pipe holding hole (21) by thermal conductive adhesive and protrudes from the end face of the balance disc (2).

9. A motor, comprising the motor rotor according to any one of claims 1 to 8.

10. A vehicle power system, comprising the motor rotor according to any one of claims 1 to 8.

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