Permanent magnet motor stator with parallel cooling water paths

Abstract

The application discloses a permanent magnet motor stator with parallel cooling water paths, and relates to the technical field of permanent magnet motors. The permanent magnet motor stator comprises a stator assembly and a cooling water path assembly. The stator assembly comprises a stator frame and a stator core. The outer wall of the stator core is connected to the inner wall of the stator frame. The inner wall and the outer wall of the stator core are respectively provided with tooth grooves and yoke groove along the circumferential side. The cooling water path assembly comprises a first main pipe, a second main pipe, a yoke pipe and a slot pipe. The first main pipe and the second main pipe are arranged at intervals in the stator frame. The yoke pipe is arranged in the yoke groove, and the inlet and outlet of the yoke pipe are connected to the first main pipe. The slot pipe is arranged in the tooth groove, and the inlet and outlet of the slot pipe are connected to the second main pipe. The cooling water path assembly has two groups of main pipes for heat dissipation, so that the heat dissipation efficiency of the stator core is high. In addition, the first main pipe and the second main pipe are arranged at intervals in the stator frame in a space utilization manner, and do not occupy the internal space of the stator frame.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of permanent magnet motors, in particular to a permanent magnet motor stator with parallel cooling water paths. BACKGROUND

[0002] In order to improve performance indicators such as power density, high-performance permanent magnet motors must use high electrical and magnetic loads. The motor thermal load and copper loss also increase. If the heat generated by the motor stator cannot be quickly removed, it will cause the temperature of key components such as motor windings and rotor permanent magnets to rise too quickly and too high, thereby affecting the stable operation of the motor and greatly reducing the service life of the motor. Traditional high-performance permanent magnet motors often use machine base water cooling, core yoke pipe water cooling, slot pipe water cooling, and slot water cooling plus machine base water cooling composite cooling technology to cool the motor. The heat generated by the motor stator is removed through the cooling water circulation pipeline. The cooling water circulation pipeline mainly includes a main cooling pipe and a plurality of branch cooling pipes connected to the main cooling pipe. All branch cooling pipes are connected around the main cooling pipe, and branch cooling pipes are mainly arranged on the motor windings to efficiently remove the heat of the motor windings.

[0003] The prior art with publication number CN112332568A discloses a slot water-cooled motor stator, which includes a stator base, a stator core, windings, a cooling pipe assembly, and an inlet / outlet water collector. The cooling pipe assembly is composed of multiple cooling pipes. Each cooling pipe is composed of a straight section and an end connecting section that are connected in series along the motor slot. The inlet and outlet pipes of the cooling pipe straight section are embedded in the x1 and x1+S1 / x1-S1 slots, respectively. S1 is the number of slots per unit motor. The end connecting section is bent outward along the radial direction of the stator core end space. The end of the cooling pipe assembly does not interfere with each other in the radial direction.

[0004] However, the existing motor stator still has some deficiencies. For example, the main cooling pipe of the motor stator cooling water circulation pipeline has only one group, and all cooling pipe assemblies are connected in sequence around the inlet and outlet pipes. The pipeline system formed by the connection of the cooling pipe assembly and the inlet and outlet pipes is complex, and the pipeline system has low heat dissipation efficiency for the motor windings. SUMMARY

[0005] The present application aims to overcome the above technical deficiencies and provides a permanent magnet motor stator with parallel cooling water paths to solve the technical problems of the prior art, in which the inlet and outlet pipes of the cooling water circulation pipeline have only one group, and all cooling pipe assemblies are connected in sequence around the inlet and outlet pipes. The pipeline system formed by the connection of the cooling pipe assembly and the inlet and outlet pipes is complex, and the pipeline system has low heat dissipation efficiency for the motor windings.

[0006] To achieve the above technical purpose, the present application adopts the following technical solutions:

[0007] The application provides a permanent magnet motor stator with parallel cooling water paths, comprising:

[0008] A stator assembly, comprising a stator frame and a stator core, the stator frame is internally hollow, the outer wall of the stator core is connected to the inner wall of the stator frame, and the inner wall and the outer wall of the stator core are respectively provided with tooth slots and yoke slots along the circumferential side.

[0009] A cooling water path assembly, comprising a first main pipe and a second main pipe, a yoke pipe and a slot pipe, the first main pipe and the second main pipe are arranged at intervals in the stator frame, the yoke pipe is located in the yoke slot, and the inlet and outlet of the yoke pipe are connected to the first main pipe, the slot pipe is located in the tooth slot, and the inlet and outlet of the slot pipe are connected to the second main pipe.

[0010] In some embodiments, the yoke pipe comprises a plurality of continuously curved elbow pipe units, each of the elbow pipe units is located in the yoke slot of the stator core.

[0011] In some embodiments, the number of yoke pipes is a plurality, and the plurality of yoke pipes are arranged around the circumferential side of the stator core, and the plurality of yoke pipes fill the yoke slots of the stator core.

[0012] In some embodiments, the yoke pipe is curved to form a avoiding space, and the slot pipe is connected to the first main pipe through the avoiding space.

[0013] In some embodiments, the first main pipe comprises a first coil pipe and a second coil pipe, the inlet of the yoke pipe is connected to the first coil pipe, the outlet of the yoke pipe is connected to the second coil pipe, and the first coil pipe and the second coil pipe are respectively connected to different water sources.

[0014] In some embodiments, the slot pipe comprises a first slot pipe unit and a second slot pipe unit, the first slot pipe unit is connected to the first main pipe, and the second slot pipe unit is connected to the second main pipe.

[0015] In some embodiments, the first slot pipe unit comprises a plurality of first slot pipes, each of the first slot pipes is continuously curved, and the plurality of first slot pipes are arranged at equal intervals.

[0016] In some embodiments, the first main pipe comprises a first coil pipe and a second coil pipe, the inlet and outlet of each of the first slot pipes are respectively connected to the first coil pipe and the second coil pipe.

[0017] In some embodiments, the second slot pipe unit comprises a plurality of second slot pipes, each of the second slot pipes is continuously curved, the plurality of second slot pipes are arranged at equal intervals, and the plurality of second slot pipes and the plurality of first slot pipes are arranged alternately and fill the tooth slots of the stator core.

[0018] In some embodiments, the second manifold includes a third coil pipe and a fourth coil pipe, and the inlet and outlet of each of the second slot pipes are connected to the third coil pipe and the fourth coil pipe, respectively.

[0019] Compared with the prior art, the cooling water path assembly of the permanent magnet motor stator with parallel cooling water paths provided by the application has two groups of manifolds for heat dissipation, namely a first manifold and a second manifold, the yoke pipes are located on the outer wall of the stator core and pass through the yoke slots, and the slot pipes are located on the inner wall of the stator core and pass through the tooth slots. The yoke pipes and the slot pipes are connected to the first manifold and the second manifold, respectively, and can be cooled by the cooling liquid flowing in the first manifold and the second manifold, respectively. The yoke pipes and the slot pipes are not all connected to the same manifold as in the prior art, so the heat dissipation efficiency of the application is higher. In addition, the first manifold and the second manifold are spaced and sleeved on the stator frame in an up-down manner, the welding connection of the first manifold, the second manifold, the yoke pipes and the slot pipes is convenient, and the formed pipe system is simple and easy to manage. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a structure schematic diagram of a permanent magnet motor stator provided by an embodiment of the application;

[0021] Figure 2 is a structure schematic diagram of a plurality of yoke pipes and slot pipes connected to a stator frame provided by an embodiment of the application;

[0022] Figure 3 is a structure schematic diagram of a plurality of yoke pipes connected to a stator frame provided by an embodiment of the application;

[0023] Figure 4 is a structure schematic diagram of a yoke pipe provided by an embodiment of the application;

[0024] Figure 5 is a structure schematic diagram of a stator frame provided by an embodiment of the application;

[0025] Figure 6 is a structure schematic diagram of a stator core provided by an embodiment of the application;

[0026] Figure 7 is a structure schematic diagram of a plurality of slot pipes connected to a stator frame provided by an embodiment of the application;

[0027] Figure 8 is a structure schematic diagram of a slot pipe and a first manifold and a second manifold connected provided by an embodiment of the application from one perspective;

[0028] Figure 9 is a structure schematic diagram of a slot pipe and a first manifold and a second manifold connected provided by an embodiment of the application from another perspective. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0030] To address the problems in existing cooling water circulation systems where there is typically only one set of inlet and outlet pipes, and all cooling pipe assemblies are sequentially connected around this single pipe, resulting in low heat dissipation efficiency for the motor windings and a complex cooling water circulation system that is inconvenient for welding pipes inside the motor stator, this invention provides a permanent magnet motor stator with parallel cooling water circuits. This improves the heat dissipation efficiency of the motor windings. The cooling pipes are more evenly and rationally distributed, and welding connections between the pipes are easier.

[0031] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of a permanent magnet motor stator with parallel cooling water channels according to an embodiment of the present invention. The permanent magnet motor stator includes a stator assembly 1 and a cooling water channel assembly. The stator assembly 1 includes a stator frame 11 and a stator core 12. The outer wall of the stator core 12 is connected to the inner wall of the stator frame 11, for example, by welding. The inner and outer walls of the stator core 12 are respectively provided with toothed grooves 121 and yoke grooves 122 along their circumferences. Figure 6 (As shown), the slot 121 is available for the coil winding to be wound so that the coil winding is connected to the stator core 12.

[0032] The cooling water circuit assembly includes a first main pipe 21 and a second main pipe 22, a yoke pipe 23 and a slotted pipe 24. The first main pipe 21 and the second main pipe 22 are spaced apart on the stator frame 11. The yoke pipe 23 is located in the yoke slot 122 of the stator core 12, and the inlet and outlet of the yoke pipe 23 are connected to the first main pipe 21. The slotted pipe 24 is located in the tooth slot 121 of the stator core 12, and the inlet and outlet of the slotted pipe 24 are connected to the second main pipe 22.

[0033] Both the first main pipe 21 and the second main pipe 22 can be connected to a cooling source to provide coolant to the yoke tube 23 and the slotted tube 24. Since both the yoke tube 23 and the slotted tube 24 are in contact with the stator core 12, they can dissipate heat from the stator core 12 through heat conduction. The yoke tube 23 and the slotted tube 24 are located in the yoke slot 122 and the toothed slot 121 of the stator core 12, respectively, resulting in a large contact area between the yoke tube 23, the slotted tube 24 and the stator core 12, and high heat dissipation efficiency for the stator core 12.

[0034] The stator frame 11 is provided with a plurality of windows 111 along the circumferential side of the stator frame 11. The windows 111 not only facilitate heat dissipation of the stator core 12 inside the stator frame 11, but also facilitate arrangement of the first header pipe 21, the second header pipe 22, the yoke pipe 23 and the slot pipe 24 on the stator frame 11, thereby facilitating construction.

[0035] The stator frame 11 is provided with a plurality of first clamping grooves 112 and a plurality of second clamping grooves 113 along the circumferential side of the stator frame 11 near the top. The plurality of first clamping grooves 112 are located in the same circumferential plane, and the plurality of second clamping grooves 113 are located in the same circumferential plane, and are used for clamping the first header pipe 21 to fix the first header pipe 21.

[0036] In one embodiment, as shown in Figure 2 , the first header pipe 21 comprises a first coil pipe 211 and a second coil pipe 212. The inlet of the yoke pipe 23 is connected to the first coil pipe 211, and the outlet of the yoke pipe 23 is connected to the second coil pipe 212. The first coil pipe 211 and the second coil pipe 212 are not directly connected, and are provided with corresponding flanges and are connected to the same cooling source through the flanges. The cooling liquid of the cooling source flows back to the cooling source in sequence through the first coil pipe 211, the yoke pipe 23 and the second coil pipe 212, so that the cooling liquid in the yoke pipe 23 continuously flows to take away the heat emitted by the stator core 12 in contact with the yoke pipe 23.

[0037] In one embodiment, as shown in Figure 4 , the yoke pipe 23 comprises a plurality of continuous curved elbow pipe units 231. Each of the elbow pipe units 231 is located in the yoke slot 122 of the stator core 12. The shape and curvature of the elbow pipe unit 231 can be adapted to the shape of the yoke slot 122, so that the elbow pipe unit 231 can be clamped into the yoke slot 122, increase the contact area with the stator core 12, and improve the heat dissipation efficiency of the stator core 12. Figure 3 The yoke pipe 23 of the embodiment shown comprises three elbow pipe units 231. In other embodiments, the yoke pipe 23 can also have two, four or more than four elbow pipe units 231.

[0038] In one embodiment, as shown in Figure 3 , the number of yoke pipes 23 is a plurality, and the plurality of yoke pipes 23 are arranged around the circumferential side of the stator core 12, and the plurality of yoke pipes 23 fill the yoke slots 122 of the stator core 12. In this embodiment, the vertical length of the yoke pipe 23 is relatively long, and in the vertical direction, the yoke pipe 23 is in full contact with the yoke slot 122 of the stator core 12, which can take away more heat from the stator core 12. In addition, the plurality of yoke pipes 23 are arranged along the circumferential side of the stator frame 11, and fill the yoke slots 122 of the stator core 12, which has high heat dissipation efficiency for the stator core 12.

[0039] Please refer to Figure 5The stator frame 11 is provided with a plurality of limiting grooves 114 along the circumferential side thereof, each yoke pipe 23 passes through the plurality of limiting grooves 114, and each limiting groove 114 is used for limiting and fixing one bending unit 231 of the yoke pipe 23, so that the yoke pipe 23 is stably fixed to the stator frame 11.

[0040] In one embodiment, referring to Figure 4 The yoke pipe 23 is bent to form an avoiding space 232, and the slot pipe 24 passes through the avoiding space 232 and is connected to the first main pipe 21, so that the internal space of the stator frame 11 is fully utilized, more cooling pipes are arranged in the limited space, and the heat dissipation efficiency of the stator core 12 is improved.

[0041] In one embodiment, referring to Figure 7 and Figure 8 The slot pipe 24 includes a first slot pipe unit 241 and a second slot pipe unit 242, the first slot pipe unit 241 is connected to the first main pipe 21, and the second slot pipe unit 242 is connected to the second main pipe 22. In this embodiment, the first slot pipe unit 241 and the second slot pipe unit 242 are respectively connected to different cooling pipe lines, the flow efficiency of the cooling liquid is high, the heat dissipation efficiency of the stator core 12 is high, and the first slot pipe unit 241 and the second slot pipe unit 242 are arranged in the tooth slot 121 of the stator core 12, the contact area with the stator core 12 is large, and the heat dissipation efficiency of the stator core 12 is higher.

[0042] In one embodiment, referring to Figure 7 and Figure 8 The first slot pipe unit 241 includes a plurality of first slot pipes 243, each first slot pipe 243 is continuously bent, and the plurality of first slot pipes 243 are arranged at equal intervals. The shape and curvature of the first slot pipe 243 can be set according to the size of the tooth slot 121 of the stator core 12, so that one first slot pipe 243 can pass through a plurality of tooth slots 121, the contact area of the first slot pipe 243 with the stator core 12 is increased, and the heat dissipation efficiency is improved.

[0043] In one embodiment, referring to Figure 8 and Figure 9The second slot pipe unit 242 comprises a plurality of second slot pipes 244, each of which is continuously curved, and the plurality of second slot pipes 244 are equidistantly spaced and staggered with the plurality of first slot pipes 243 and fill the tooth slots 121 of the stator core 12. In the embodiment, the plurality of second slot pipes 244 are staggered with the plurality of first slot pipes 243, so that the space can be saved and the internal space of the stator frame 11 can be fully utilized. In addition, the plurality of second slot pipes 244 are staggered with the plurality of first slot pipes 243, so that the tooth slots 121 of the stator core 12 can be alternately filled, the contact area with the stator core 12 is large, and the heat dissipation efficiency of the stator core 12 is high.

[0044] Please refer to Figure 8 and Figure 9 , Figure 8 and Figure 9 The first slot pipe 243 and the second slot pipe 244 of the embodiment shown in the drawings are provided with three, and the three first slot pipes 243 and the three second slot pipes 244 are staggered and curved, which can be in full contact with the tooth slots 121 of the stator core 12 while extending the pipeline, and maximize the contact area of the slot pipe 24 with the stator core 12.

[0045] In one of the embodiments, please refer to Figure 2 The second manifold 22 comprises a third coil pipe 221 and a fourth coil pipe 222, the inlet and outlet of each second slot pipe 244 are connected to the third coil pipe 221 and the fourth coil pipe 222 respectively, the third coil pipe 221 and the fourth coil pipe 222 are not directly connected, and are provided with flanges and can be connected to the same cooling source through the respective flanges. The cooling liquid of the cooling source first flows into the third coil pipe 221, then passes through the plurality of second slot pipes 244, and finally flows back to the cooling source through the fourth coil pipe 222 to form a cooling cycle and continuously take away the heat of the stator core 12.

[0046] In order to better understand the present application, the technical solutions of the present application will be described in detail below in combination with Figures 1 to 9

[0047] ​The cooling water path assembly of the permanent magnet motor stator with parallel cooling water paths has two groups of main pipes for heat dissipation, namely a first main pipe 21 and a second main pipe 22, a yoke pipe 23 is located on the outer wall of the stator core 12 and is clamped in the yoke slot 121, and a slot pipe 24 is located on the inner wall of the stator core 12 and passes through the tooth slot 122. The yoke pipe 23 and the slot pipe 24 are connected to the first main pipe 21 and the second main pipe 22 respectively, and can be cooled by the cooling liquid flowing in the first main pipe 21 and the second main pipe 22 respectively. The yoke pipe 23 and the slot pipe 24 are not all connected to the same cooling pipe as in the prior art, so the cooling efficiency of the present application is higher. In addition, the first main pipe 21 and the second main pipe 22 are spaced and sleeved on the stator frame 11, and the welding connection of the first main pipe 21, the second main pipe 22, the yoke pipe 23 and the slot pipe 24 is convenient.

[0048] The specific embodiments of the application described above do not constitute a limitation on the scope of protection of the application. Any various other corresponding changes and modifications made according to the technical concept of the application shall be included in the scope of protection of the claims of the application.

Claims

1. A permanent magnet motor stator having parallel cooling water paths, characterized by, The application relates to a stator assembly and a cooling water path assembly. The stator assembly comprises a stator frame and a stator core, the stator frame is internally hollow, the outer wall of the stator core is connected to the inner wall of the stator frame, and the inner wall and the outer wall of the stator core are respectively provided with tooth slots and yoke slot along the circumferential side. The cooling water path assembly comprises a first main pipe and a second main pipe, a yoke pipe and a slot pipe, the first main pipe and the second main pipe are arranged in the stator frame, the yoke pipe is arranged in the yoke slot, the inlet of the yoke pipe is connected to the first main pipe, and the outlet of the yoke pipe is connected to the second main pipe. The first main pipe comprises a first coil pipe and a second coil pipe, the inlet of the yoke pipe is connected to the first coil pipe, the outlet of the yoke pipe is connected to the second coil pipe, and the first coil pipe and the second coil pipe are respectively connected to different water sources. The slot pipe comprises a first slot pipe unit and a second slot pipe unit, the first slot pipe unit is connected to the first main pipe, and the second slot pipe unit is connected to the second main pipe. The first slot pipe unit comprises a plurality of first slot pipes, each first slot pipe is continuously curved, and the plurality of first slot pipes are arranged at equal intervals. The first main pipe comprises a first coil pipe and a second coil pipe, the inlet and the outlet of each first slot pipe are respectively connected to the first coil pipe and the second coil pipe. The second slot pipe unit comprises a plurality of second slot pipes, each second slot pipe is continuously curved, the plurality of second slot pipes are arranged at equal intervals, and the plurality of second slot pipes and the plurality of first slot pipes are arranged in a staggered mode and fill the tooth slots of the stator core. The second main pipe comprises a third coil pipe and a fourth coil pipe, the inlet and the outlet of each second slot pipe are respectively connected to the third coil pipe and the fourth coil pipe.

2. The permanent magnet motor stator with parallel cooling water paths according to claim 1, characterized in that, The yoke pipe comprises a plurality of continuously curved bend pipe units, each bend pipe unit is arranged in the yoke slot of the stator core.

3. The permanent magnet motor stator with parallel cooling water paths according to claim 2, characterized in that, The number of the yoke pipes is plural, the plurality of yoke pipes are arranged around the circumferential side of the stator core, and the plurality of yoke pipes fill the yoke slots of the stator core.

4. The permanent magnet motor stator with parallel cooling water paths according to claim 2, characterized in that, The yoke pipe is curved to form an avoiding space, and the slot pipe is arranged in the avoiding space and connected to the first main pipe.

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