Permanent magnet motor stator with parallel cooling waterways

Abstract

The invention discloses a permanent magnet motor stator with parallel cooling waterways, and relates to the technical field of permanent magnet motors, the permanent magnet motor stator comprises a stator assembly and a cooling waterway assembly, the stator assembly comprises a stator base and a stator iron core, and the outer wall of the stator iron core is connected with the inner wall of the stator base; the inner wall and the outer wall of the stator core are respectively provided with a tooth groove and a yoke groove along the circumferential side. The cooling water path assembly comprises a first header pipe, a second header pipe, yoke pipes and notch pipes, the first header pipe and the second header pipe are arranged on the stator base at intervals, the yoke pipes are located in the yoke grooves, inlets and outlets of the yoke pipes are connected with the first header pipe, the notch pipes are located in the tooth grooves, and inlets and outlets of the notch pipes are connected with the second header pipe. The cooling water path assembly is provided with two groups of header pipes for heat dissipation, so that the heat dissipation efficiency of the stator iron core is high. In addition, the first header pipe and the second header pipe vertically sleeve the stator base at intervals, so that the space is reasonably utilized, and the internal space of the stator base is not additionally occupied.

Description

Technical Field

[0001] The invention relates to the technical field of permanent magnet motors, and in particular to a permanent magnet motor stator with parallel cooling water circuits. Background Art

[0002] In order to improve performance indicators such as power density, high-performance permanent magnet motors must use higher electrical and magnetic loads, and the motor heat load and copper loss will also increase accordingly. If the heat generated by the motor stator cannot be quickly removed, this will cause the temperature of key components such as the 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 life of the motor. Traditional high-performance permanent magnet motors often use base water cooling, core yoke pipe water cooling, slot pipe water cooling, and slot water cooling plus base water cooling composite cooling technology to cool the motor, and remove the heat generated by the motor stator through the cooling water circulation pipeline. The cooling water circulation pipeline mainly includes the connected main cooling pipe and many branch cooling pipes. All branch cooling pipes are connected around the main cooling pipe. The branch cooling pipes are mainly arranged on the motor windings to efficiently remove the heat from the motor windings.

[0003] The prior art with announcement number CN112332568A discloses an in-slot water-cooled motor stator, including a stator frame, a stator core, a winding, 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 pair of axially folded straight sections and end connecting sections connected in series along the motor slot, the water inlet pipe and the water outlet pipe of the straight section of the cooling pipe are respectively embedded in the x1th and x1+S1 / x1-S1th slots, S1 is the number of motor slots per unit, the end connecting section is bent outward along the radial direction of the stator core end space, and the ends of the cooling pipe assembly do not cross and interfere with each other in the radial direction.

[0004] However, the existing motor stators still have some shortcomings. For example, the cooling water circulation pipeline of the motor stator has only one group of main cooling pipes, and all cooling pipe assemblies are connected in sequence around the inlet and outlet water pipes. The piping system formed by the cooling pipe assemblies and the inlet and outlet water pipes is complicated, and the piping system has low heat dissipation efficiency for the motor windings. Summary of the invention

[0005] The purpose of the present invention is to overcome the above-mentioned technical deficiencies and propose a permanent magnet motor stator with a parallel cooling water circuit, so as to solve the technical problems in the prior art that the cooling water circulation pipeline has only one group of inlet and outlet water pipes, and all cooling pipe assemblies are connected in sequence around the inlet and outlet water pipes, the piping system formed by the connection between the cooling pipe assemblies and the inlet and outlet water pipes is complicated, and the piping system has low heat dissipation efficiency for the motor winding.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: The present invention provides a permanent magnet motor stator with parallel cooling water circuits, comprising: A stator assembly, comprising a stator frame and a stator core, wherein the interior of the stator frame is 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 circumference; and A cooling water circuit assembly includes a first main pipe and a second main pipe, a yoke pipe and a slot pipe, wherein the first main pipe and the second main pipe are arranged at intervals on 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, and 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.

[0007] In some embodiments, the yoke tube includes a plurality of continuously bent tube units, and each of the bent tube units is located in a yoke slot of the stator core.

[0008] In some embodiments, there are multiple yoke tubes, and the multiple yoke tubes are arranged around the circumference of the stator core, and the multiple yoke tubes are fully distributed in the yoke slots of the stator core.

[0009] In some embodiments, the yoke tube is bent to form an escape space, and the slot tube passes through the escape space and is connected to the first main pipe.

[0010] In some embodiments, the first main pipe includes a first coil and a second coil, the inlet of the yoke pipe is connected to the first coil, the outlet of the yoke pipe is connected to the second coil, and the first coil and the second coil are respectively connected to different water sources.

[0011] In some embodiments, the slotted pipe includes a first slotted pipe unit and a second slotted pipe unit, the first slotted pipe unit is connected to the first main pipe, and the second slotted pipe unit is connected to the second main pipe.

[0012] In some embodiments, the first slotted tube unit includes a plurality of first slotted tubes, each of the first slotted tubes is in a continuously curved shape, and the plurality of first slotted tubes are arranged at equal intervals.

[0013] In some embodiments, the first main pipe includes a first coil and a second coil, and the inlet and the outlet of each of the first slot pipes are respectively connected to the first coil and the second coil.

[0014] In some embodiments, the second slot tube unit includes a plurality of second slot tubes, each of which is in a continuously curved shape, and the plurality of second slot tubes are arranged at equal intervals, and the plurality of second slot tubes and the plurality of first slot tubes are arranged alternately and fill the tooth slots of the stator core.

[0015] In some embodiments, the second main pipe includes a third coil and a fourth coil, and the inlet and the outlet of each of the second slot pipes are respectively connected to the third coil and the fourth coil.

[0016] Compared with the prior art, the cooling water circuit assembly of the permanent magnet motor stator with parallel cooling water circuit provided by the present invention has two groups of main pipes for heat dissipation, namely the first main pipe and the second main pipe, the yoke pipe is located on the outer wall of the stator core and passes through the yoke slot, and the notch pipe is located on the inner wall of the stator core and passes through the tooth slot. The yoke pipe and the notch pipe are respectively connected to the first main pipe and the second main pipe, and the heat can be dissipated by the coolant flowing in the first main pipe and the second main pipe respectively. The yoke pipe and the notch pipe are not all connected to the same main pipe as in the prior art, so the heat dissipation efficiency of the present application is higher. In addition, the first main pipe and the second main pipe are sleeved on the stator frame at intervals up and down, and the welding connection of the first main pipe, the second main pipe and the yoke pipe and the notch pipe is convenient, and the formed pipeline system is simple and easy to manage. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a structural schematic diagram of a permanent magnet motor stator provided in an embodiment of the present invention; Figure 2 It is a schematic structural diagram of a plurality of yoke tubes and slot tubes connected to a stator frame provided by an embodiment of the present invention; Figure 3 It is a schematic structural diagram of a plurality of yoke tubes connected to a stator frame provided by an embodiment of the present invention; Figure 4 is a schematic structural diagram of a yoke tube provided by an embodiment of the present invention; Figure 5 is a structural schematic diagram of a stator frame provided by an embodiment of the present invention; Figure 6 is a schematic structural diagram of a stator core provided by an embodiment of the present invention; Figure 7 It is a schematic structural diagram of a plurality of slotted tubes connected to a stator frame provided by an embodiment of the present invention; Figure 8 It is a structural schematic diagram of the connection between the notched pipe and the first main pipe and the second main pipe according to an embodiment of the present invention from a perspective; Fig. 9 It is a structural schematic diagram of the connection between the notched pipe and the first main pipe and the second main pipe provided from another perspective in an embodiment of the present invention. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0019] In order to solve the technical problems that the cooling water circulation pipeline of the prior art usually has only one set of inlet and outlet water pipes, and all cooling pipe assemblies are connected in sequence around the inlet and outlet water pipes, which not only has low heat dissipation efficiency for the motor winding, but also the entire cooling water circulation pipeline is complicated and it is inconvenient to weld the pipeline inside the motor stator, the present invention provides a permanent magnet motor stator with parallel cooling water circuits, which can improve the heat dissipation efficiency of the motor winding. The cooling pipeline distribution is more uniform and reasonable, and the welding connection between the pipelines is more convenient.

[0020] See also Figure 1 , Figure 1 The structure diagram of a permanent magnet motor stator with a parallel cooling water path in one embodiment of the present invention is shown in FIG. The permanent magnet motor stator includes a stator assembly 1 and a cooling water path 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 wall and the outer wall of the stator core 12 are respectively provided with tooth slots 121 and yoke slots 122 along the circumferential side. Figure 6 As shown), the tooth slots 121 can be used for winding the coil winding so that the coil winding is connected to the stator core 12.

[0021] The cooling water circuit assembly includes a first main pipe 21 and a second main pipe 22, a yoke pipe 23 and a slot pipe 24. The first main pipe 21 and the second main pipe 22 are arranged at intervals 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 slot pipe 24 is located in the tooth slot 121 of the stator core 12, and the inlet and outlet of the slot pipe 24 are connected to the second main pipe 22.

[0022] The first main pipe 21 and the second main pipe 22 can be connected to a cooling source respectively to provide cooling liquid for the yoke pipe 23 and the slot pipe 24. Since the yoke pipe 23 and the slot pipe 24 are in contact with the stator core 12, the stator core 12 can be cooled by heat conduction. The yoke pipe 23 and the slot pipe 24 are respectively located in the yoke slot 122 and the tooth slot 121 of the stator core 12, so that the contact area between the yoke pipe 23, the slot pipe 24 and the stator core 12 is large, and the heat dissipation efficiency of the stator core 12 is high.

[0023] The stator frame 11 is provided with a plurality of windows 111 along its circumference, which are not only conducive to heat dissipation of the stator core 12 inside the stator frame 11, but also facilitate the arrangement of the first main pipe 21, the second main pipe 22, the yoke pipe 23 and the notch pipe 24 on the stator frame 11, and the construction is convenient.

[0024] A plurality of first slots 112 and a plurality of second slots 113 are provided along the circumference of the stator frame 11 near the top. The plurality of first slots 112 are located in the same circumferential plane, and the plurality of second slots 113 are located in the same circumferential plane, and are used to clamp the first main pipe 21 to fix the first main pipe 21 .

[0025] In one embodiment, see Figure 2 The first main pipe 21 includes a first coil 211 and a second coil 212. The inlet of the yoke pipe 23 is connected to the first coil 211, and the outlet of the yoke pipe 23 is connected to the second coil 212. The first coil 211 and the second coil 212 are not directly connected, but are both provided with corresponding flanges and connected to the same cooling source through the flanges. The coolant of the cooling source flows back to the cooling source through the first coil 211, the yoke pipe 23, and the second coil 212 in sequence, so that the coolant in the yoke pipe 23 continues to flow and takes away the heat emitted by the stator core 12 in contact with the yoke pipe 23.

[0026] In one embodiment, see Figure 4 The yoke tube 23 includes a plurality of continuously bent pipe units 231, each of which is located in the yoke slot 122 of the stator core 12. The shape and curvature of the bent pipe unit 231 can be adapted to the shape of the yoke slot 122, so that the bent pipe unit 231 can be just inserted into the yoke slot 122, thereby increasing the contact area with the stator core 12 and improving the heat dissipation efficiency of the stator core 12. Figure 3 The yoke tube 23 of the illustrated embodiment includes three bent tube units 231 . In other embodiments, the yoke tube 23 may also have two, four or more bent tube units 231 .

[0027] In one embodiment, see Figure 3 , there are multiple yoke tubes 23, and the multiple yoke tubes 23 are arranged around the circumference of the stator core 12, and the multiple yoke tubes 23 are fully covered with the yoke slots 122 of the stator core 12. In this embodiment, the vertical length of the yoke tube 23 is relatively long, and in the vertical direction, the yoke tube 23 is in full contact with the yoke slots 122 of the stator core 12, which can take away more heat from the stator core 12. In addition, the multiple yoke tubes 23 are arranged along the circumference of the stator frame 11, and are fully covered with the yoke slots 122 of the stator core 12, which has a high heat dissipation efficiency for the stator core 12.

[0028] See also Figure 5 The stator frame 11 is provided with a plurality of limiting grooves 114 along its circumferential side, and each yoke tube 23 is penetrated by a plurality of limiting grooves 114 . Each limiting groove 114 is used to limit and fix a bending unit 231 of the yoke tube 23 , so that the yoke tube 23 is stably fixed to the stator frame 11 .

[0029] In one embodiment, see Figure 4 The yoke tube 23 is bent to form an escape space 232 , and the notch tube 24 passes through the escape 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 a limited space, and the heat dissipation efficiency of the stator core 12 is improved.

[0030] In one embodiment, see Figure 7 and Figure 8 The slot tube 24 includes a first slot tube unit 241 and a second slot tube unit 242. The first slot tube unit 241 is connected to the first main pipe 21, and the second slot tube unit 242 is connected to the second main pipe 22. In this embodiment, the first slot tube unit 241 and the second slot tube unit 242 are respectively connected to different cooling pipelines, the flow efficiency of the coolant is high, and the heat dissipation efficiency of the stator core 12 is high. In addition, the first slot tube unit 241 and the second slot tube unit 242 are fully covered with the tooth slots 121 of the stator core 12, and the contact area with the stator core 12 is large, and the heat dissipation efficiency of the stator core 12 is higher.

[0031] In one embodiment, see Figure 7 and Figure 8 The first slot tube unit 241 includes a plurality of first slot tubes 243, each of which is in a continuously curved shape, and the plurality of first slot tubes 243 are arranged at equal intervals. The shape and curvature of the first slot tube 243 can be set according to the size of the tooth slots 121 of the stator core 12, so that one first slot tube 243 can pass through a plurality of tooth slots 121, thereby increasing the contact area between the first slot tube 243 and the stator core 12 and improving the heat dissipation efficiency.

[0032] In one embodiment, see Figure 8 and Fig. 9 The second slot tube unit 242 includes a plurality of second slot tubes 244, each of which is in a continuously curved shape, and the plurality of second slot tubes 244 are arranged at equal intervals, and the plurality of second slot tubes 244 are arranged alternately with the plurality of first slot tubes 243 and fill the tooth slots 121 of the stator core 12. In this embodiment, the plurality of second slot tubes 244 and the plurality of first slot tubes 243 are arranged alternately, which can achieve the effect of saving space, and the internal space of the stator frame 11 can be fully utilized. In addition, the plurality of second slot tubes 244 and the plurality of first slot tubes 243 are arranged alternately, which can alternately fill the tooth slots 121 of the stator core 12, have a large contact area with the stator core 12, and have high heat dissipation efficiency for the stator core 12.

[0033] See also Figure 8 and Fig. 9 , Figure 8 and Fig. 9In the illustrated embodiment, three first slot tubes 243 and three second slot tubes 244 are provided, and the three first slot tubes 243 and the three second slot tubes 244 are bent and staggered, which can fully contact the tooth slots 121 of the stator core 12 while extending the pipeline, thereby maximizing the contact area between the slot tube 24 and the stator core 12.

[0034] In one embodiment, see Figure 2 The second main pipe 22 includes a third coil 221 and a fourth coil 222. The inlet and outlet of each second slot tube 244 are respectively connected to the third coil 221 and the fourth coil 222. The third coil 221 and the fourth coil 222 are not directly connected, and both are provided with flanges, and can be connected to the same cooling source through their respective flanges. The coolant of the cooling source first flows into the third coil 221, then passes through multiple second slot tubes 244, and finally flows back to the cooling source through the fourth coil 222 to form a cooling cycle, continuously taking away the heat of the stator core 12.

[0035] In order to better understand the present invention, the following Figures 1 to 9 The technical solution of the present invention is described in detail: The cooling water circuit assembly of the permanent magnet motor stator with parallel cooling water circuit provided by the present invention has two groups of main pipes for heat dissipation, namely, the first main pipe 21 and the second main pipe 22, the yoke pipe 23 is located on the outer wall of the stator core 12 and clamped with the yoke groove 121, and the notch pipe 24 is located on the inner wall of the stator core 12 and passes through the tooth groove 122. The yoke pipe 23 and the notch pipe 24 are respectively connected to the first main pipe 21 and the second main pipe 22, and the heat can be dissipated by the coolant flowing in the first main pipe 21 and the second main pipe 22 respectively. The yoke pipe 23 and the notch pipe 24 are not all connected to the same cooling pipe as in the prior art, so the heat dissipation efficiency of the present application is higher. In addition, the first main pipe 21 and the second main pipe 22 are sleeved on the stator frame 11 at intervals up and down, and the welding connection of the first main pipe 21, the second main pipe 22 and the yoke pipe 23 and the notch pipe 24 is convenient.

[0036] The specific implementation of the present invention described above does not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A permanent magnet motor stator with parallel cooling water circuits, characterized in that: include: A stator assembly, comprising a stator frame and a stator core, wherein the interior of the stator frame is 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 circumference; and A cooling water circuit assembly includes a first main pipe and a second main pipe, a yoke pipe and a slot pipe, wherein the first main pipe and the second main pipe are arranged at intervals on 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, and 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.

2. The permanent magnet motor stator with parallel cooling water circuits according to claim 1, characterized in that: The yoke tube includes a plurality of continuously bent tube units, and each of the bent tube units is located in a yoke slot of the stator core.

3. The permanent magnet motor stator with parallel cooling water circuits according to claim 2, characterized in that: There are multiple yoke tubes, and the multiple yoke tubes are arranged around the circumference of the stator core. The multiple yoke tubes cover the yoke slots of the stator core.

4. The permanent magnet motor stator with parallel cooling water circuits according to claim 2, characterized in that: The yoke pipe is bent to form an escape space, and the notch pipe passes through the escape space and is connected to the first main pipe.

5. The permanent magnet motor stator with parallel cooling water circuits according to claim 1, characterized in that: The first main pipe includes a first coil and a second coil. The inlet of the yoke pipe is connected to the first coil, and the outlet of the yoke pipe is connected to the second coil. The first coil and the second coil are connected to different water sources respectively.

6. The permanent magnet motor stator with parallel cooling water circuits according to claim 1, characterized in that: The slotted pipe includes a first slotted pipe unit and a second slotted pipe unit, wherein the first slotted pipe unit is connected to the first main pipe, and the second slotted pipe unit is connected to the second main pipe.

7. The permanent magnet motor stator with parallel cooling water circuits according to claim 6, characterized in that: The first slotted tube unit includes a plurality of first slotted tubes, each of the first slotted tubes is in a continuously curved shape, and the plurality of first slotted tubes are arranged at equal intervals.

8. The permanent magnet motor stator with parallel cooling water circuits according to claim 7, characterized in that: The first main pipe includes a first coil and a second coil, and the inlet and the outlet of each of the first slot pipes are respectively connected to the first coil and the second coil.

9. The permanent magnet motor stator with parallel cooling water circuits according to claim 7, characterized in that: The second slot tube unit includes a plurality of second slot tubes, each of which is in a continuously curved shape, and the plurality of second slot tubes are arranged at equal intervals, and the plurality of second slot tubes and the plurality of first slot tubes are arranged alternately and fill the tooth slots of the stator core.

10. The permanent magnet motor stator with parallel cooling water circuits according to claim 9, characterized in that: The second main pipe includes a third coil and a fourth coil, and the inlet and the outlet of each of the second slot pipes are respectively connected to the third coil and the fourth coil.

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