Stator liquid cooling flow channel, liquid cooling stator and liquid cooling motor

Abstract

The invention discloses a stator liquid cooling flow channel, a liquid cooling stator and a liquid cooling motor, the liquid cooling flow channel comprises an annular pipe, one end of which is provided with a flow channel inlet pipe; one end of the winding pipe is connected with the annular pipe, and the other end of the winding pipe is provided with a runner outlet; the winding pipe passes through a plurality of stator slots which are distributed along the circumference; the liquid cooling flow channel can cool the winding and the iron core at the same time, and the problem of heating caused by copper loss and iron loss of the motor is solved. A complex flow channel does not need to be additionally designed, and the heat dissipation structure does not occupy the design space of other parts. The cooling runner is closer to a heat source, the heat conduction path is short, the heat resistance is reduced, the heat conductivity coefficient is improved, and the cooling efficiency is improved.

Description

Technical Field

[0001] The invention relates to the field of liquid-cooled motors, in particular to a stator liquid-cooling flow channel. Background Art

[0002] There are many types of liquid-cooled motors, including water cooling and oil cooling. Water cooling is to design flow channels on the shell structure to allow water to flow to achieve heat exchange. This heat dissipation method requires the addition of a cooling structure, which will lead to adverse effects on processing costs, uneven strength, maintenance costs, etc. The mechanical structure is complex and sealing issues need to be considered. Oil cooling is to directly penetrate the oil into the end of the motor winding coil, which will lead to a complex oil circuit structure. An unreasonable oil circuit structure will cause the cooling oil to be unevenly distributed in the motor, causing the motor to have uneven temperature rise, resulting in local over-temperature problems, requiring high design and processing difficulties, and it is difficult to ensure sealing. These solutions are difficult to use in situations such as electric-driven foot robots that have extremely high requirements for lightweight and miniaturized motors. Summary of the invention

[0003] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract of the specification and the title of the invention of this application to avoid blurring the purpose of this section, the abstract of the specification and the title of the invention, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0004] In view of the above problems and / or the problems existing in the prior art, the present invention is proposed.

[0005] Therefore, the technical problem to be solved by the present invention is that the existing heat dissipation method requires the addition of a cooling structure, which will lead to adverse effects on processing costs, uneven strength, maintenance costs, etc.

[0006] In order to solve the above technical problems, in a first aspect, the present invention provides the following technical solutions: a stator liquid cooling flow channel, comprising an annular tube, one end of which is provided with a flow channel inlet pipe;

[0007] A winding tube, one end of which is connected to the annular tube and the other end of which is provided with a flow channel outlet;

[0008] The winding tube passes through a plurality of stator slots distributed along the circumference.

[0009] As a preferred solution of the stator liquid cooling channel of the present invention, the winding tube includes a plurality of short tubes in an annular array, and the plurality of short tubes are distributed in each stator slot;

[0010] The plurality of short tubes are connected end to end to form a flow channel except for one end connected to the annular tube and one end where the flow channel outlet is arranged.

[0011] As a preferred solution of the stator liquid cooling channel of the present invention, the annular tube is arranged around the iron core.

[0012] As a preferred solution of the stator liquid cooling channel of the present invention, the short tubes are connected with each other through bent tubes.

[0013] As a preferred solution of the stator liquid cooling channel of the present invention, the bent tube is bent toward the axial direction of the stator.

[0014] As a preferred solution of the stator liquid cooling flow channel of the present invention, wherein: the flow channel outlet is connected to an outlet pipe, and the outlet pipe is arranged in parallel with the inlet pipe.

[0015] In a second aspect, the present invention provides the following technical solution: a liquid-cooled stator, wherein: comprising the stator liquid-cooling flow channel;

[0016] It also includes a plurality of stator cores, wherein stator slots are formed between two adjacent stator cores, and the winding tube passes through the plurality of stator slots distributed along the circumference.

[0017] As a preferred solution of the liquid-cooled stator of the present invention, it further comprises a thermally conductive potting glue, and the thermally conductive potting glue pots the liquid-cooling flow channel on the outer periphery of the stator.

[0018] As a preferred solution of the stator liquid-cooling channel of the present invention, the annular tube is located on one end surface of the iron core of the liquid-cooling stator.

[0019] In a third aspect, the present invention provides the following technical solution: a liquid-cooled motor, comprising the liquid-cooled stator.

[0020] Beneficial effects of the present invention:

[0021] 1. The winding and the iron core can be cooled at the same time to solve the heating problem caused by the copper loss and iron loss of the motor.

[0022] 2. No additional complex flow channel design is required, and the heat dissipation structure does not occupy the design space of other components.

[0023] 3. The cooling channel is closer to the heat source, the heat conduction path is short, the thermal resistance is reduced, the thermal conductivity is increased, and the cooling efficiency is improved.

[0024] 4. Compared with other cooling methods, this cooling method is easier to ensure sealing and has low manufacturing difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0026] Figure 1 A schematic diagram of the structure of a stator liquid cooling channel according to an embodiment of the present invention;

[0027] Figure 2 A schematic structural diagram of a stator liquid cooling channel according to another embodiment of the present invention;

[0028] Figure 3 A schematic top view of a stator liquid cooling channel according to an embodiment of the present invention;

[0029] Figure 4 A schematic structural diagram of a liquid-cooled stator according to an embodiment of the present invention;

[0030] Figure 5 A schematic diagram of a liquid-cooled stator flow passage in an embodiment of the present invention in an inlet and outlet direction;

[0031] Figure 6 A schematic structural diagram of the back side of a liquid-cooled stator according to another embodiment of the present invention;

[0032] Figure 7 A schematic structural diagram of a liquid-cooled stator according to an embodiment of the present invention;

[0033] Figure 8 A schematic diagram of the structure of a motor according to another embodiment of the present invention;

[0034] Fig. 9 A schematic diagram of the exploded structure of a motor according to an embodiment of the present invention. DETAILED DESCRIPTION

[0035] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0036] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0037] Secondly, the present invention is described in detail with reference to schematic diagrams. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0038] Furthermore, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0039] Reference Figure 1 The stator liquid cooling channel is a complete pipeline. The structure is formed by bending a whole copper pipe. There are some other materials that may achieve similar effects, which are not specifically limited here.

[0040] It should be noted that the inner rotor motor is taken as an example in the embodiment, but it is not limited to the inner rotor motor. Any motor with stator slots can adopt the stator liquid cooling channel, such as the outer rotor motor, which is not specifically limited here.

[0041] In some embodiments, reference Figure 1 The stator liquid cooling channel includes an annular tube 100 and a winding tube 200. The annular tube 100 and the winding tube 200 are formed by bending a whole copper tube, which reduces the number of parts, simplifies the processing flow, and reduces the strength risk caused by component connection.

[0042] Among them, a flow channel inlet pipe 101 is provided at one end of the annular tube 100, and the inlet pipe 101 can be one end of the annular tube 100 or an external pipe, which is not specifically limited here. That is, the annular tube 100 allows the liquid cooling flow channel inlet to first wrap around the iron core to allow the coolant to initially cool the motor as a whole, and then penetrate into the motor slot for cooling, so as to avoid excessive temperature difference between the inlet and outlet of the liquid cooling port and fully cool the winding.

[0043] One end of the winding tube 200 is connected to the annular tube 100 , and the other end is provided with a flow channel outlet 201 . Similarly, the flow channel outlet 201 can be one end of the winding tube 200 or an external pipe, which is not specifically limited here.

[0044] The winding tube 200 passes through a number of stator slots distributed along the circumference. The stator slot is the gap between a number of stator cores on the stator motor, and the core has a winding; that is, the winding tube 200 is wound in an S-shape or a serpentine shape, and the cooling channel is closer to the heat source and the heat conduction path is short. The liquid cooling channel is wound in a serpentine shape in the stator slot, which significantly shortens the distance between the cooling channel and the heat source (winding and core). According to the principle of heat conduction, the shorter the heat conduction path, the smaller the thermal resistance, and the faster the heat transfer. This design minimizes the loss of heat during the transfer process, improves the thermal conductivity, and enables the motor to dissipate heat more efficiently.

[0045] In some embodiments, for ease of understanding, the structural body of the winding tube 200 is decomposed and distinguished. The winding tube 200 includes a plurality of short tubes 202 in an annular array, and the plurality of short tubes 202 are distributed in each stator slot; the plurality of short tubes 202 are connected end to end to form a flow channel except for one end connected to the annular tube 100 and one end where the flow channel outlet 201 is set, that is, the short tubes 202 are connected end to end, not that the winding tube 200 forms a closed loop, but that the winding tube 200 is connected in the first position except for one end and one end, and the two ends of the winding tube 200 are respectively connected to the annular tube 100 and the flow channel outlet 201.

[0046] In some embodiments, reference Figure 2 The annular tube 100 is arranged around the iron core. The cage-type liquid cooling channel inlet first wraps around the iron core to allow the coolant to initially cool the motor as a whole, and then penetrates into the motor slot for cooling, avoiding excessive temperature difference between the inlet and outlet of the liquid cooling port and fully cooling the winding.

[0047] In some embodiments, reference Figures 2-3 The short tubes 202 are connected to each other through a bending tube 203, and the bending tube 203 is bent toward the axial direction of the stator, so that the liquid cooling channel becomes longer, and the area covered by the winding and the time flowing through the winding are both increased.

[0048] In some embodiments, reference Figure 2 The flow channel outlet 201 is connected to an outlet pipe 201a, the outlet pipe 201a is arranged in parallel with the inlet pipe 101, and the external connection refers to a pipeline outside the motor.

[0049] In some embodiments, reference Figures 4 to 6 A liquid-cooled stator includes the above-mentioned stator liquid-cooling channel; wherein the liquid-cooled stator includes a plurality of stator cores 300, the cores 300 include an annular structure and winding cores distributed along the circumference of the annular structure, and a stator slot 301 is formed between two adjacent stator cores 300. The winding tube 200 passes through the plurality of stator slots 301 distributed along the circumference and penetrates into the motor slot for cooling.

[0050] In some embodiments, a heat-conducting potting glue 400 is also included, and the heat-conducting potting glue 400 pots the above-mentioned liquid cooling channel on the outer periphery of the stator, that is, a whole copper tube is bent to form a cage-type liquid cooling channel and then the stator is integrally potted with the heat-conducting potting glue, which is easy to process and has good sealing. The stator liquid cooling channel realizes effective planning of the coolant flow path, ensures that the coolant is evenly distributed inside the motor, and performs comprehensive and balanced cooling on the winding and the core.

[0051] In some embodiments, reference Figure 7 , the runner and stator are tightly combined, and after the combination, thermal conductive potting glue is injected to make the three form an organic whole. The thermal conductive potting glue plays multiple key roles here: it fills the tiny gaps that may exist between the runner and the stator, greatly improving the heat conduction efficiency, ensuring that the heat can be quickly transferred from the heated stator and winding to the coolant in the runner; at the same time, after the potting glue is cured, it can also enhance the structural strength of the stator, prevent the loosening or damage of the components due to vibration, thermal expansion and contraction during the operation of the motor, and improve the overall stability and reliability of the motor; this integrated design not only optimizes the heat dissipation performance, but also enhances the structural strength of the motor without adding too much extra weight, and strikes a good balance between the requirements of lightweight and high strength.

[0052] In some embodiments, the annular tube 100 is located on one end face of the iron core of the liquid-cooled stator. First, wrap a circle around the iron core to allow the coolant to initially cool the entire motor, and then go deep into the motor slot for cooling, avoiding excessive temperature difference in and out of the liquid cooling port and fully cooling the winding; a unique step-by-step cooling path, that is, the flow channel inlet is first wrapped around the iron core as the center and then goes deep into the motor slot. This method takes into account the heating characteristics and heat dissipation requirements of different parts inside the motor. The iron core is an important part of the motor magnetic circuit. A large amount of heat will be generated during the operation of the motor. Preliminary cooling of the iron core first can effectively reduce the overall temperature and create more favorable conditions for subsequent cooling of the winding deep into the slot.

[0053] At the same time, this step-by-step cooling method avoids excessive temperature difference when the coolant enters and exits the liquid cooling port, thereby improving the utilization efficiency of the coolant and ensuring the stability and effectiveness of the entire cooling process.

[0054] In some embodiments, reference Figures 8-9 A liquid-cooled motor includes the above-mentioned liquid-cooled stator, which has a simple structure and is easy to manufacture. It can maintain light weight while maintaining strength and long service life.

[0055] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0056] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0057] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A stator liquid cooling channel, characterized in that: include, An annular tube (100) having a flow channel inlet tube (101) disposed at one end thereof; A winding tube (200), one end of which is connected to the annular tube (100) and the other end of which is provided with a flow channel outlet (201); The winding tube (200) passes through a plurality of stator slots distributed along the circumference.

2. The stator liquid cooling channel according to claim 1, characterized in that: The winding tube (200) comprises a plurality of short tubes (202) in an annular array, and the plurality of short tubes (202) are distributed in each stator slot; The plurality of short tubes (202) are connected end to end to form a flow channel, except for one end connected to the annular tube (100) and one end provided with a flow channel outlet (201).

3. The stator liquid cooling channel according to claim 1 or 2, characterized in that: The annular tube (100) is arranged around the iron core.

4. The stator liquid cooling channel according to claim 3, characterized in that: The short tubes (202) are connected to each other via a bent tube (203).

5. The stator liquid cooling channel according to claim 4, characterized in that: The bending tube (203) is bent towards the axial center direction of the stator.

6. The stator liquid cooling channel according to any one of claims 2, 4 and 5, characterized in that: The flow channel outlet (201) is connected to an outlet pipe (201a), and the outlet pipe (201a) is arranged in parallel with the inlet pipe (101).

7. A liquid-cooled stator, characterized in that: Including the stator liquid cooling channel; It also comprises a plurality of stator cores (300), wherein a stator slot (301) is formed between two adjacent stator cores (300), and the winding tube (200) passes through the plurality of stator slots (301) distributed along the circumference.

8. The liquid-cooled stator according to claim 7, characterized in that: It also includes a heat-conducting potting glue (400), wherein the heat-conducting potting glue (400) pots the liquid cooling channel on the outer periphery of the stator.

9. The liquid-cooled stator according to claim 7 or 8, characterized in that: The annular tube (100) is located on one end surface of the iron core of the liquid-cooled stator.

10. A liquid-cooled motor, characterized in that: Including the liquid-cooled stator.

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