Rotor, motor and vehicle
By setting a gap between the rotor core poles of the electro-excitation synchronous motor and using a heat pipe for cooling, the problem of difficult heat dissipation of the rotor coil is solved, and efficient cooling and output power are achieved.
Patent Information
- Application Number
- CN202323662055.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-29
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2033-12-29
AI Technical Summary
The rotor coil of the electro-excitation synchronous motor generates a large amount of heat after being energized, which is difficult to dissipate quickly, resulting in a decrease in the output power and may burn.
Set a gap between the magnetic poles of the rotor core, and place a heat pipe in these gaps. The heat conductivity of the heat pipe is used to quickly transfer heat to enhance heat dissipation ability.
Through efficient cooling, the motor is prevented from being damaged by local overheating, which increases the output power and ensures the safety of the rotor coil.
Smart Images
Figure CN222147255U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of motor technology, and in particular to a rotor, a motor and a vehicle. Background Art
[0002] The rotor coil of an electrically excited synchronous motor will generate a large amount of heat after being energized. When the rotor is in a rotating state, the heat inside the coil is difficult to dissipate quickly, causing the output power of the motor to decrease. In severe cases, the rotor coil may burn out. Utility Model Content
[0003] A series of simplified concepts are introduced in the utility model content section, which will be further described in detail in the detailed implementation section. The utility model content section of this application does not mean to attempt to define the key features and essential technical features of the technical solution claimed for protection, nor does it mean to attempt to determine the scope of protection of the technical solution claimed for protection.
[0004] The technical problem to be solved by the present application is that a coil with electricity will generate a large amount of heat. If the rotor coil cannot be cooled efficiently, the output power of the motor will decrease, and in severe cases, the rotor coil may burn out.
[0005] In order to at least partially solve the above technical problems, the first aspect of the present application provides a rotor, characterized in that the rotor comprises: a rotor core, the rotor core comprises a plurality of magnetic poles and a plurality of coils, the plurality of magnetic poles are distributed along the circumference of the rotor core, the coils are wound on the magnetic poles, and a gap is formed between two adjacent coils; a heat pipe, the heat pipe is arranged in the gap, and at least part of the structure of the heat pipe extends out of the rotor core.
[0006] According to the rotor of the present application, the heat pipe is arranged in the gap formed by adjacent coils. Through the strong thermal conductivity of the heat pipe, a large amount of heat generated by the energized coil can be quickly transferred out, thereby enhancing the heat dissipation capacity of the coil inside the rotor and enabling the rotor coil to be efficiently cooled.
[0007] Optionally, the heat pipe is divided into a heat absorbing end and a condensing end, the heat absorbing end is in the gap, and the condensing end extends out of the gap.
[0008] Optionally, the heat absorption end contacts at least one of the corresponding two coils.
[0009] Optionally, the heat absorption end is in contact with two of the corresponding two coils.
[0010] Optionally, a heat-conducting material is filled between the heat-absorbing end and the coil.
[0011] Optionally, a size of the gap in the circumferential direction of the rotor core is between 2 mm and 5 mm.
[0012] Optionally, a group of heat pipes are arranged in the gap, including a first heat pipe and a second heat pipe, the heat absorption end of the first heat pipe and the heat absorption end of the second heat pipe are both located in the gap, the condensation end of the first heat pipe extends out of the rotor core in a direction away from the second heat pipe; the condensation end of the second heat pipe extends out of the rotor core in a direction away from the first heat pipe.
[0013] Optionally, the heat absorbing end of the first heat pipe is spaced apart from the heat absorbing end of the second heat pipe.
[0014] Optionally, the heat absorbing end of the first heat pipe contacts the heat absorbing end of the second heat pipe.
[0015] Optionally, the heat absorption end and the condensation end are arranged at an angle.
[0016] Optionally, the heat absorption end and the condensation end are arranged vertically.
[0017] Optionally, the rotor further includes an end cover, and the condensing end is connected to the end cover.
[0018] Optionally, the end cover is located on a condensation path of the motor.
[0019] Optionally, the rotor further comprises a rotating shaft, the rotating shaft is provided with a central hole, and the central hole is used for placing a cooling medium.
[0020] A second aspect of the present application provides an electric motor, comprising the rotor described in any one of the above items.
[0021] Optionally, the motor further comprises a shell, the shell is arranged on the outer side of the end cover, a cooling cavity is formed between the shell and the end cover, a portion of the shaft extending out of the rotor core is provided with a hole, and the hole is connected to the cooling cavity.
[0022] According to the motor of the second aspect of the present application, the heat pipe transfers the heat of the rotor coil and takes the heat out of the motor through the cooling medium, so that the temperature rise inside the motor is balanced, preventing the motor from being damaged due to local overheating, and improving the output power of the motor.
[0023] A third aspect of the present application also provides a vehicle, comprising the motor described above. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] The following drawings of the embodiments of the present application are hereby used as part of the present application for understanding the present application. The drawings show the embodiments of the present application and their descriptions, and are used to explain the principles of the present application. In the drawings,
[0025] Figure 1 A half-section view of an electrically excited motor with heat pipe cooling;
[0026] Figure 2 It is a schematic diagram of the motor rotor structure;
[0027] Figure 3 is a schematic diagram of the rotor cross section;
[0028] Figure 4 It is a schematic diagram of the installation of the heat pipe in the rotor;
[0029] Figure 5 is a schematic diagram of a heat pipe end cap assembly;
[0030] Figure 6 Schematic diagram of the working principle of the heat pipe.
[0031] Description of reference numerals:
[0032] 1. Rotor core; 11. Magnetic pole; 12. Coil; 2. Heat pipe; 21. Heat absorption end; 22. Condensation end; 23. First heat pipe; 24. Second heat pipe; 25. Tube shell; 26. Liquid absorption core; 3. Gap; 4. End cover; 41. First end cover; 42. Second end cover; 5. Rotating shaft; 51. Center hole; 6. Hole; 61. First oil hole; 62. Second oil hole; 7. Outer shell; 8. Cooling chamber; 9. Insulating paper; X: Gas movement direction; Y: Liquid movement direction. DETAILED DESCRIPTION
[0033] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present application. However, it is obvious to those skilled in the art that the present application embodiments can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present application embodiments, some technical features well known in the art are not described.
[0034] Herein, ordinal numbers such as “first” and “second” cited in the present application are merely identifications and do not have any other meanings, such as a specific order, etc. Moreover, for example, the term “first component” itself does not imply the existence of the “second component”, and the term “second component” itself does not imply the existence of the “first component”.
[0035] In this document, “upper”, “lower”, “front”, “back”, “left”, “right”, etc. are only used to indicate the relative position relationship between related parts, rather than to limit the absolute positions of these related parts.
[0036] In this document, “equal”, “same”, etc. are not strictly limited in a mathematical and / or geometric sense, but also include errors that can be understood by those skilled in the art and are allowed in manufacturing or use.
[0037] Unless otherwise stated, the numerical ranges herein include not only the entire range within its two endpoints but also include several sub-ranges contained therein.
[0038] The present application embodiment provides a rotor, which is suitable for a motor, such as Figures 1 to 6 As shown, the rotor includes a rotor core 1 and a heat pipe 2. The rotor core 1 includes a plurality of magnetic poles 11 and a plurality of coils 12. The plurality of magnetic poles 11 are distributed along the circumference of the rotor core 1. The coils 12 are wound on the magnetic poles 11. A gap 3 is formed between two adjacent coils 12. The heat pipe 2 is arranged in the gap 3. At least part of the structure of the heat pipe 2 extends out of the rotor core 1.
[0039] In specific production, the rotor core 1 in the present application is usually made of stacked metal sheets, specifically, electrical steel sheets, etc. The rotor core 1 is provided with magnetic poles 11 equal to the number of motor poles. Figure 3 In the embodiment shown, a 6-pole motor is shown, so there are 6 corresponding magnetic poles 11, and a group of coils 12 are wound around each magnetic pole 11. Due to the limitation of the winding process, there will be a gap 3 between two adjacent coils 12. The rotor of the present application just uses the gap 3 to insert the heat pipe 2 with heat conduction function into it, so as to solve the problem that the heat of the energized coil 12 is difficult to dissipate.
[0040] Furthermore, an insulating paper 9 may be provided between the coil 12 and the rotor core 1. By providing the insulating paper 9, the coil 12 and the rotor core 1 are insulated to avoid danger caused by overheating of the rotor core 1 due to electromagnetic action.
[0041] According to the rotor of the present application, by arranging the heat pipe 2 in the gap 3 formed by adjacent coils 12, the strong thermal conductivity of the heat pipe 2 can be used to quickly transfer a large amount of heat generated by the energized coil 12, thereby enhancing the heat dissipation capacity of the coil 12 inside the rotor, allowing the rotor coil 12 to be efficiently cooled, thereby balancing the temperature rise inside the motor, preventing the motor from being damaged due to local overheating, and improving the output power of the motor.
[0042] In one embodiment, if Figure 4 and Figure 5 As shown, the heat pipe 2 is divided into a heat absorbing end 21 and a condensing end 22, the heat absorbing end 21 is in the gap 3, and the condensing end 22 extends out of the gap 3. The heat generated by the coil 12 is conducted from the heat absorbing end 21 in the gap 3 to the condensing end 22 outside the gap 3, so as to solve the problem that the coil 12 is difficult to dissipate heat.
[0043] In one embodiment, the heat absorbing end 21 contacts at least one of the two corresponding coils 12. The heat absorbing end 21 contacts the coil 12, transfers the heat generated by the coil 12, and dissipates heat and cools the inside of the coil 12. The heat absorbing end 21 may contact one of the two corresponding coils 12 in the gap 3, or may contact both coils 12, so as to fully transfer the heat generated by the coil 12.
[0044] In one embodiment, a heat conductive material is also filled between the heat absorbing end 21 and the coil 12. When there is a problem that the heat pipe 2 and the coil 12 cannot be fully contacted due to process limitations, a heat conductive material can be filled between the heat absorbing end 21 and the coil 12 to ensure that the heat absorbing end 21 of the heat pipe 2 is fully in contact with the coil 12, with good heat conduction, and the heat of the rotor is quickly transferred out.
[0045] In some embodiments, Figure 6 As shown, the heat pipe 2 is mainly composed of a tube shell 25, a liquid wick 26 and a liquid. The tube shell 25 is made of copper or aluminum with a good thermal conductivity. It should be noted that the technical personnel in this field can select the material of the tube shell 25 according to the actual production and use requirements, and no specific limitation is made in this application. Specifically, the heat conduction principle of the heat pipe 2 can be: the inside of the heat pipe 2 is pumped into a negative pressure state, and a suitable liquid is filled into the inside of the heat pipe 2. This liquid has a low boiling point and is easy to volatilize. The tube wall has a liquid wick 26, which is composed of a capillary porous material. One end of the heat pipe 2 is a heat absorbing end 21, and the other end is a condensing end 22. When the heat absorbing end 21 of the heat pipe 2 is heated, the liquid in the capillary wick 26 evaporates rapidly, and the vapor flows to the other end condensing end 22 (the X direction is the vapor movement direction) under a small force difference, and releases heat, and recondenses into liquid, and the liquid flows back to the heat absorbing end 21 (the Y direction is the liquid movement direction) along the porous material by the action of capillary force, and the cycle continues, and the heat is transferred from the heat absorbing end 21 of the heat pipe 2 to the other end condensing end 22. This cycle is carried out quickly, and the heat can be conducted continuously.
[0046] In one embodiment, the size of the gap 3 in the circumferential direction of the rotor core 1 is between 2 mm and 5 mm, which can accommodate at least one heat pipe 2. The size of the gap 3 varies depending on the level of the process.
[0047] In one embodiment, if Figure 1 As shown, a group of heat pipes 2 are arranged in the gap 3, including a first heat pipe 23 and a second heat pipe 9. The heat absorbing end 21 of the first heat pipe 23 and the heat absorbing end 21 of the second heat pipe 24 are both located in the gap 3, and the heat absorbing end 21 of the first heat pipe 23 and the heat absorbing end 21 of the second heat pipe 24 are arranged at intervals in the gap 3. The condensation end 22 of the first heat pipe 23 extends out of the rotor core 1 in a direction away from the second heat pipe 24, and the condensation end 22 of the second heat pipe 24 extends out of the rotor core 1 in a direction away from the first heat pipe 23.
[0048] In such Figure 1 In the illustrated embodiment, the heat absorbing end 21 of the first heat pipe 23 and the heat absorbing end 21 of the second heat pipe 24 are disposed facing and contacting each other.
[0049] In other embodiments not shown in the figures, the heat absorbing end 21 of the first heat pipe 23 and the heat absorbing end 21 of the second heat pipe 24 may be arranged in staggered contact with each other, or may be arranged without contact with each other.
[0050] In one embodiment, the heat absorption end 21 and the condensation end 22 are arranged at an angle.
[0051] In a detailed embodiment, Figure 5 As shown, the condensation end 22 of the heat pipe 2 is bent 90 degrees and is vertically arranged with the heat absorption end 21 of the heat pipe 2, which is beneficial to the installation of the condensation end 22 of the heat pipe 2.
[0052] In one embodiment, the rotor further includes an end cover 4, which is arranged corresponding to the number of heat pipes 2 arranged in a single gap 3. Figure 2 and Figure 5 As shown, when two heat pipes 2 are arranged in a gap 3, two end caps 4 need to be arranged corresponding to the heat pipes 2, and the condensation end 22 is connected to the end cap 4. The connection method of the condensation end 22 and the end cap 4 can be gluing or welding. The condensation end 22 of the first heat pipe 23 extends out of the rotor core 1 in a direction away from the second heat pipe 24 and is connected to the first end cap 41, and the condensation end 22 of the second heat pipe 24 extends out of the rotor core 1 in a direction away from the first heat pipe 23 and is connected to the second end cap 42. The material of the end cap 4 is a material with good thermal conductivity such as aluminum or copper.
[0053] In one embodiment, the rotor further comprises a rotating shaft 5, and the rotating shaft 5 is provided with a central hole 51, and a cooling medium is placed in the central hole 51. The cooling medium may be cooling oil.
[0054] In one embodiment, the end cover 4 is fixedly disposed on the rotor. For example, the end cover 4 may be sleeved on the rotating shaft 5 of the rotor, or may be fixed to the magnetic pole 11 by a fastener.
[0055] In one embodiment, the end cap 4 is located on the condensation path of the motor. The end cap 4 is a non-heat-generating component, and due to the cooling of the cooling oil provided by the central hole 51, the temperature is relatively low, so that the temperature difference between the heat absorbing end 21 of the heat pipe 2 inserted into the coil 12 and the condensation end 22 close to the end cap 4 is relatively large, which is beneficial to the heat transfer efficiency of the heat pipe 2. The heat pipe 2 absorbs the heat of the coil 12 and quickly transfers it to the end cap 4. The heat of the end cap 4 is mainly taken away by the cooling oil, thereby forming a fast heat transfer channel connecting the coil 12 and the end cap 4 by the heat pipe 2.
[0056] The present application also provides an electric motor, comprising the rotor described above.
[0057] In one embodiment, if Figure 1 As shown, the motor further includes a housing 7, which is arranged on the outside of the end cover 4, a cooling chamber 8 is formed between the housing 7 and the end cover 4, and a hole is provided at the portion of the rotating shaft 5 extending out of the rotor core 1, and the hole is connected to the cooling chamber 8. The rotating shaft 5 is a hollow structure, and a first oil hole 61 is provided at the portion of the rotating shaft 5 extending out of the rotor core 1 and close to the first end cover 41, and a second oil hole 62 is provided at the portion of the rotating shaft 5 extending out of the rotor core 1 and close to the second end cover 42. Cooling oil is passed through the center hole 51, and the cooling oil is thrown out from the first oil hole 61 and the second oil hole 62 under the centrifugal force of the rotating shaft 5, enters the cooling chamber 8, and splashes onto the first end cover 41 and the second end cover 42, so as to cool the first end cover 41 and the second end cover 42.
[0058] It should be noted that in the embodiment of the present application, the specific structure of the rotor is the same as the structure of the rotor in the above embodiments, and its beneficial effects are similar, which will not be described in detail here. In the embodiment of the present application, by placing a heat pipe 2 in the gap of the rotor coil 12, the heat pipe 2 transfers the heat of the rotor coil 12 and takes the heat out of the motor through the cooling medium, so that the temperature rise inside the motor is balanced, preventing the motor from being damaged due to local overheating, and improving the output power of the motor.
[0059] The present application also provides a vehicle, the vehicle comprising the motor described above. In the embodiment of the present application, the vehicle has better performance by increasing the output power of the motor of the vehicle.
[0060] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art in the technical field of this application. The terms used herein are only for describing specific implementation purposes and are not intended to limit this application. Terms such as "setting" appearing in this article can mean that one component is directly attached to another component, or that one component is attached to another component through an intermediate. Features described in this article in one embodiment may be applied to another embodiment alone or in combination with other features, unless the feature is not applicable in the other embodiment or otherwise specified.
[0061] The present application has been described through the above-mentioned embodiments, but it should be understood that the above-mentioned embodiments are only for the purpose of example and description, and are not intended to limit the present application to the described embodiments. It can be understood by those skilled in the art that more variations and modifications can be made according to the teachings of the present application, and these variations and modifications all fall within the scope of protection claimed in the present application.
Claims
1. A rotor, It is characterized in that include: A rotor core, wherein the rotor core comprises a plurality of magnetic poles and a plurality of coils, wherein the plurality of magnetic poles are distributed along the circumference of the rotor core, the coils are wound around the magnetic poles, and a gap is formed between two adjacent coils; A heat pipe is arranged in the gap, and at least a part of the structure of the heat pipe extends out of the rotor core.
2. The rotor according to claim 1, It is characterized in that The heat pipe is divided into a heat absorbing end and a condensing end, the heat absorbing end is in the gap, and the condensing end extends out of the gap.
3. The rotor according to claim 2, It is characterized in that The heat absorbing end contacts at least one of the corresponding two coils.
4. The rotor according to claim 3, It is characterized in that The heat absorbing end contacts two of the corresponding two coils.
5. The rotor according to claim 2, It is characterized in that A heat-conducting material is filled between the heat-absorbing end and the coil.
6. The rotor according to claim 2, It is characterized in that The size of the gap in the circumferential direction of the rotor core is between 2 mm and 5 mm.
7. The rotor according to claim 1, It is characterized in that A group of heat pipes are arranged in the gap, including a first heat pipe and a second heat pipe. The heat absorbing end of the first heat pipe and the heat absorbing end of the second heat pipe are both located in the gap. The condensing end of the first heat pipe extends out of the rotor core in a direction away from the second heat pipe; the condensing end of the second heat pipe extends out of the rotor core in a direction away from the first heat pipe.
8. The rotor according to claim 7, It is characterized in that The heat absorbing end of the first heat pipe is spaced apart from the heat absorbing end of the second heat pipe.
9. The rotor according to claim 8, It is characterized in that The heat absorbing end of the first heat pipe contacts the heat absorbing end of the second heat pipe.
10. The rotor according to claim 9, It is characterized in that The heat absorption end and the condensation end are arranged at an angle.
11. The rotor according to claim 10, It is characterized in that The heat absorption end and the condensation end are arranged vertically.
12. The rotor according to claim 11, It is characterized in that The rotor further comprises an end cover, and the condensing end is connected to the end cover.
13. The rotor according to claim 12, It is characterized in that The end cover is located on the condensation path of the motor.
14. The rotor according to claim 13, It is characterized in that The rotor further comprises a rotating shaft, wherein the rotating shaft is provided with a central hole, and the central hole is used for placing a cooling medium.
15. A motor, It is characterized in that Comprising the rotor described in any one of claims 1-14.
16. The electric machine according to claim 15, It is characterized in that The motor further comprises a shell, which is arranged on the outer side of the end cover, a cooling cavity is formed between the shell and the end cover, a portion of the rotating shaft extending out of the rotor core is provided with a hole, and the hole is communicated with the cooling cavity.
17. A vehicle, It is characterized in that Includes the motor as claimed in claim 16.