A permanent magnet motor stator

Abstract

This invention discloses a permanent magnet motor stator, relating to the field of permanent magnet motor technology. It includes a stator assembly and a cooling water circuit assembly. The stator assembly includes a stator frame and a stator core connected to each other. The stator frame has a cavity for accommodating the stator core. The inner and outer walls of the stator core are respectively provided with toothed grooves and a yoke groove along their circumference. The cooling water circuit assembly includes an inlet pipe, an outlet pipe, a first slotted pipe, and a second slotted pipe. The inlet and outlet pipes are spaced apart on the stator frame. The first slotted pipe is located in a toothed groove, and its inlet and outlet are respectively connected to the inlets of the inlet and second slotted pipes. The second slotted pipe is located in the yoke groove, and its outlet is connected to the outlet pipe. Because the first and second slotted pipes are located in the toothed groove and yoke groove of the stator core, respectively, they have a large contact area with the stator core, simultaneously dissipating heat from both the inner and outer sides of the stator core, resulting in high heat dissipation efficiency for the stator core.

Description

Technical Field

[0001] This invention relates to the field of permanent magnet motor technology, and more specifically to a permanent magnet motor stator. Background Technology

[0002] To improve performance indicators such as power density, high-performance permanent magnet motors inevitably employ higher electrical and magnetic loads, which also increases the motor's thermal load and copper losses. If the heat generated by the motor stator cannot be dissipated quickly, critical components such as the motor windings and rotor permanent magnets will experience excessively rapid and high temperatures, affecting stable motor operation and significantly reducing motor lifespan. Therefore, it is necessary to install a piping system on the motor stator, through which coolant circulates to remove the heat generated by the motor stator.

[0003] Prior art, disclosed in CN117767603A, is a permanent magnet motor stator with a series cooling water circuit. The stator includes a stator frame, a stator core, windings, and a series cooling water circuit system. The stator frame is a cage-type frame. The series cooling water circuit system includes slotted water pipe assemblies located in the stator teeth, yoke water pipes located in the stator yoke, and inlet / outlet main pipes located at the stator ends. In the series cooling water circuit system, the slotted water pipe assemblies, yoke water pipes, and inlet / outlet main pipes are connected in series by welding. The number of slotted water pipe assemblies and yoke water pipes corresponds one-to-one. This invention is rationally designed, simple in structure, stable and reliable, and easy to maintain. The cooling water circuit is close to the heat source, resulting in high heat dissipation efficiency and significantly improving the power density and other performance characteristics of the permanent magnet motor.

[0004] However, this existing technology still has shortcomings. For example, the water system only passes through the slots on the inner side of the stator core and does not pass through the slots on the outer side of the stator core, resulting in insufficient contact area between the water system and the stator core, and limited heat dissipation efficiency for the stator core. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a permanent magnet motor stator that solves the technical problem in the prior art where the water circuit system only passes through the slot on the inner side of the stator core and does not pass through the slot on the outer side of the stator core, resulting in insufficient contact surface between the water circuit system and the stator core and limited heat dissipation efficiency of the stator core.

[0006] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0007] This invention provides a permanent magnet motor stator, comprising:

[0008] A stator assembly includes a stator frame and a stator core connected to each other. The stator frame has a cavity for accommodating the stator core. The inner and outer walls of the stator core are respectively provided with toothed grooves and yoke grooves along their circumferences.

[0009] The cooling water circuit assembly includes an inlet pipe, an outlet pipe, a first slot pipe, and a second slot pipe. The inlet pipe and the outlet pipe are spaced apart on the stator base. The first slot pipe is located in the tooth groove, and the inlet and outlet of the first slot pipe are respectively connected to the inlet of the inlet pipe and the inlet of the second slot pipe. The second slot pipe is located in the yoke groove, and the outlet of the second slot pipe is connected to the outlet pipe.

[0010] In some embodiments, the cooling water circuit assembly further includes a sleeve, the first slotted tube includes a first section and a second section perpendicular to each other, the first section being located in the toothed groove, the second slotted tube includes a third section and a fourth section perpendicular to each other, the third section being located in the yoke groove, and the second section and the fourth section being detachably inserted into both ends of the sleeve.

[0011] In some embodiments, the first slotted tube includes a first segment and a second segment that are perpendicular to each other, the first segment being located in the toothed groove, and the second slotted tube includes a third segment and a fourth segment that are perpendicular to each other, the third segment being located in the yoke groove, and the second segment and the fourth segment being connected by welding.

[0012] In some embodiments, the first slotted tube further includes a plurality of U-shaped tube units, the U-shaped tube units being located in the plurality of slots.

[0013] In some embodiments, there are multiple first slot tubes, which are arranged alternately around the periphery of the stator core through their respective U-shaped tube units, and the multiple first slot tubes cover the toothed grooves on the inner side of the stator core.

[0014] In some embodiments, the number of the second slotted tubes is multiple and the same as the number of the first slotted tubes, the multiple second slotted tubes are located in multiple yoke slots, and the multiple second slotted tubes are correspondingly connected to multiple first slotted tubes.

[0015] In some embodiments, the cooling water circuit assembly further includes a yoke tube located in the yoke groove, the inlet and outlet of the yoke tube being connected to the inlet pipe and the outlet pipe, respectively.

[0016] In some embodiments, the yoke tube has a plurality of U-shaped bending units located in a plurality of the yoke grooves.

[0017] In some embodiments, the number of the yoke tubes and the number of the second slot tubes are both multiple, the multiple yoke tubes are arranged around the periphery of the stator core, and the multiple yoke tubes and the multiple second slot tubes fill all the yoke slots of the stator core.

[0018] In some embodiments, both the inlet pipe and the outlet pipe are circular and are snapped into the stator base, and both the inlet pipe and the outlet pipe are located outside the accommodating cavity.

[0019] Compared with the prior art, the permanent magnet motor stator provided by the present invention has an inlet pipe and an outlet pipe that can be used to connect to a cooling source. The coolant supplied by the cooling source can flow sequentially through the inlet pipe, the first slot pipe, the second slot pipe, and the outlet pipe. Since the first slot pipe and the second slot pipe are located in the tooth slot and yoke slot of the stator core, respectively, they have a large contact area with the stator core and dissipate heat from both the inner and outer sides of the stator core, resulting in high heat dissipation efficiency of the stator core. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the permanent magnet motor stator provided in an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the structure of the permanent magnet motor stator after the stator core is removed, according to an embodiment of the present invention.

[0022] Figure 3 This is a schematic diagram of the stator core structure provided in an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the structure of the first slotted tube provided in an embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the structure of the second slotted tube provided in an embodiment of the present invention;

[0025] Figure 6 This is a schematic diagram of the structure of multiple first slot pipes, multiple second slot pipes, and water inlet pipes and water outlet pipes provided in an embodiment of the present invention;

[0026] Figure 7 This is a schematic diagram of the yoke tube provided in an embodiment of the present invention. Detailed Implementation

[0027] 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.

[0028] To address the technical problem in existing technologies where the water system only passes through the slots on the inner side of the stator core and not the slots on the outer side, resulting in insufficient contact area between the water system and the stator core and limited heat dissipation efficiency, this invention provides a permanent magnet motor stator that increases the contact area between the water system and the stator core, while simultaneously dissipating heat from both the inner and outer sides of the stator core, thereby improving the heat dissipation efficiency of the stator core.

[0029] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of a permanent magnet motor stator in one embodiment of the present invention. The permanent magnet motor stator includes a stator assembly and a cooling water circuit assembly. The stator assembly includes a stator frame 1 and a stator core 2 connected to each other. The stator frame 1 has a receiving cavity 11 for accommodating the stator core 2. The inner wall and outer wall of the stator core 2 are respectively provided with toothed grooves 21 and yoke grooves 22 along the circumference. Figure 3 (As shown). The cooling water circuit assembly includes an inlet pipe 3, an outlet pipe 4, a first slotted pipe 5, and a second slotted pipe 6. The inlet pipe 3 and the outlet pipe 4 are spaced apart on the stator frame 1. The first slotted pipe 5 is located in the slot 21 of the stator core 2, and its inlet and outlet are respectively connected to the inlets of the inlet pipe 3 and the second slotted pipe 6. The second slotted pipe 6 is located in the yoke slot 22 of the stator core 2, and its outlet is connected to the outlet pipe 4. In this embodiment, both the inlet pipe 3 and the outlet pipe 4 are used to connect to a cooling source, such as a water source. The inlet pipe 3 and the outlet pipe 4 can be connected to the water source through a first flange 31 and a second flange 41, respectively. The water source can input cooling water into the inlet pipe 3. The cooling water passes through the first slotted pipe 5 and the second slotted pipe 6 in sequence, and finally flows back to the cooling source through the outlet pipe 4, thus forming a cooling circulation loop. Since the first slot pipe 5 and the second slot pipe 6 are located in the tooth groove 21 and yoke groove 22 of the stator core 2 respectively, the cooling water can carry away the heat of the stator core 2 when passing through the first slot pipe 5 and the second slot pipe 6, thereby dissipating heat and cooling the stator core 2. Because the first slot pipe 5 and the second slot pipe 6 respectively contact the tooth groove 21 and yoke groove 22 of the stator core 2, the contact area between the cooling water circuit assembly and the stator core 2 is large, resulting in high heat dissipation efficiency for the stator core 2.

[0030] In one embodiment, please refer to Figure 2 and Figure 4The cooling water circuit assembly also includes a sleeve 7. The first slotted pipe 5 includes a first section 51 and a second section 52 that are perpendicular to each other. The first section 51 is located in the toothed groove 21. The second slotted pipe 6 includes a third section 61 and a fourth section 62 that are perpendicular to each other. The third section 61 is located in the yoke groove 22. The second section 52 and the fourth section 62 are detachably inserted into both ends of the sleeve 7. In this embodiment, neither the second section 52 nor the fourth section 62 is in contact with the stator core 2. They mainly serve a connecting function, connecting the first section 51 and the third section 61 so that the coolant can pass through the first section 51 and the third section 61 to carry away the heat from the stator core 2. The sleeve 7 can be made of rubber so that both ends of the sleeve 7 are interference-fitted with the second section 52 and the fourth section 62, respectively, which not only provides good sealing but also facilitates disassembly and assembly. During construction, due to the limited space inside the stator base 1, the first slot pipe 5 and the second slot pipe 6 need to be installed in place first, and then the first slot pipe 5 and the second slot pipe 6 are connected through the pipe sleeve 7 to complete the installation of the pipeline.

[0031] In one embodiment, please refer to Figure 4 and Figure 5 The first grooved tube 5 includes a first segment 51 and a second segment 52 that are perpendicular to each other. The first segment 51 is located in the tooth groove 21. The second grooved tube 6 includes a third segment 61 and a fourth segment 62 that are perpendicular to each other. The third segment 61 is located in the yoke groove 22. The second segment 52 and the fourth segment 62 are connected by welding. Compared with the previous embodiment, the main difference in this embodiment is that the first grooved tube 5 and the second grooved tube 6 are connected by welding, resulting in a more stable connection.

[0032] In one embodiment, the first slotted pipe 5 further includes a plurality of U-shaped pipe units 53, which are located in multiple slots 21. In this embodiment, there is one U-shaped pipe unit 53, which occupies two slots 21. When coolant flows, the U-shaped pipe unit 53 can carry away heat from the walls of the two slots 21. In other embodiments, the number of U-shaped pipe units 53 is not limited; for example, two or more units can be provided to carry away more heat.

[0033] Please see Figure 4 The first slotted tube 5 also includes a fifth section 54 and a sixth section 55. One end of the fifth section 54 is connected to the U-shaped tube unit 53, and the other end of the fifth section 54 is connected to the sixth section 55. The fifth section 55 is arranged parallel to the first section 51. The first section 51, the fifth section 55, and both sides of the U-shaped tube unit 53 are located in the slots 21 of the stator core 2. The first slotted tube 5 has a large contact area with the stator core 2, resulting in high heat dissipation efficiency for the stator core 2. In addition, the sixth section 55 is roughly hook-shaped. The end of the sixth section 55 away from the fifth section 54 is used to connect to the water inlet pipe 2, so that the coolant in the water inlet pipe 2 can enter the first slotted tube 5 and carry away the heat of the stator core 2.

[0034] In one embodiment, please refer to Figure 4 There are multiple first slot tubes 5, which are staggered and arranged around the periphery of the stator core 2 via their respective U-shaped tube units 5. Specifically, the U-shaped tube units 53 of the first slot tubes 5 are bent to form a receiving space 56, which is used to accommodate other first slot tubes 5, so that the multiple first slot tubes 5 can be staggered to save space. The multiple first slot tubes 5 fill the slots 21 on the inner side of the stator core 2 to ensure that each slot 21 of the stator core 2 can be dissipated, thereby maximizing the heat dissipation efficiency. In addition, the staggered arrangement of the multiple first slot tubes 5 in this embodiment can effectively utilize the space inside the stator frame 1. The multiple first slot tubes 5 will not appear too crowded, the arrangement is reasonable, and all slots 21 of the stator core 2 can be filled with cooling pipes, resulting in high heat dissipation efficiency.

[0035] In one embodiment, please refer to Figure 2 The number of second slotted tubes 6 is multiple, and the number of first slotted tubes 5 is the same. These multiple second slotted tubes 6 are located in multiple yoke slots 22 of the stator core 2, and are correspondingly connected to multiple first slotted tubes 5. In this embodiment, the multiple second slotted tubes 6, located in multiple yoke slots 22 of the stator core 2, increase the contact area with the stator core 2, which is beneficial for improving heat dissipation efficiency. The multiple second slotted tubes 6 correspondingly connected to multiple first slotted tubes 5 form a complete circuit, allowing coolant to flow unimpeded through each pipe. Furthermore, the second slotted tubes 6 and first slotted tubes 5 are located on opposite sides of the stator core 2, allowing heat to be carried away from both sides simultaneously, thus improving the heat dissipation efficiency of the stator core 2.

[0036] In one embodiment, please refer to Figure 1 The cooling water circuit assembly also includes a yoke pipe 8, which is located in the yoke groove 22. The inlet and outlet of the yoke pipe 8 are connected to the inlet pipe 3 and the outlet pipe 4, respectively. In this embodiment, the coolant in the inlet pipe 3 can flow through the yoke pipe 8 and then return from the outlet pipe 4 to form a complete cooling circuit. By setting the yoke pipe 8 in the yoke groove 22 of the stator core 2, this embodiment can further increase the cooling area of ​​the stator core 2, which is beneficial to further improve the heat dissipation efficiency of the stator core 2.

[0037] In one embodiment, please refer to Figure 7The yoke tube 8 has multiple U-shaped bending units 81 located in multiple yoke slots 22. In this embodiment, each U-shaped bending unit 81 occupies two yoke slots 22, and this embodiment has two and a half U-shaped bending units 81, which can occupy five yoke slots 22. In other embodiments, the yoke tube 8 can be provided with more U-shaped bending units 81 to further increase the contact area with the stator core 2 and further improve the heat dissipation efficiency of the stator core 2. In addition, the more U-shaped bending units 81 there are, the fewer connection points between the water inlet pipe 3, the water outlet pipe 4 and the yoke tube 8 are required when occupying the same yoke slot 22, so that a yoke tube 8 does not need to be inserted into each yoke slot 22.

[0038] In one embodiment, please refer to Figure 1 The stator core 2 is equipped with multiple yoke tubes 8 and multiple second slot tubes 6. These multiple yoke tubes 8 are arranged around the periphery of the stator core 2, and the multiple yoke tubes 8 and multiple second slot tubes 6 fill all the yoke slots 22 of the stator core 2. In this embodiment, by filling all the yoke slots 22 of the stator core 2 with multiple yoke tubes 8 and multiple second slot tubes 6, the contact area on the outside of the stator core 2 can be maximized, resulting in high heat dissipation efficiency of the stator core 2. Furthermore, the staggered arrangement of the multiple yoke tubes 8 and multiple second slot tubes 6 fully and rationally utilizes the internal space of the stator frame 1, allowing for a neat and orderly arrangement of multiple pipes, facilitating subsequent pipe maintenance.

[0039] In one embodiment, please refer to Figure 2 Both the inlet pipe 3 and the outlet pipe 4 are circular and are snapped into the stator frame 1. Both the inlet pipe 3 and the outlet pipe 4 are located outside the receiving cavity of the stator frame 1. The inlet pipe 3 and the outlet pipe 4 do not occupy additional space in the receiving cavity, so that the receiving cavity has enough space to install the stator core 2 and the cooling water circuit assembly. Having more space to install the cooling water circuit assembly is beneficial to further improving the heat dissipation efficiency of the stator core 2.

[0040] To better understand this invention, the following is combined with... Figures 1 to 7 The technical solution of the present invention will be described in detail below:

[0041] The permanent magnet motor stator provided by this invention has an inlet pipe 3 and an outlet pipe 4 that can be used to connect to a cooling source. The coolant supplied by the cooling source can flow sequentially through the inlet pipe 3, the first slot pipe 5, the second slot pipe 6, and the outlet pipe 4. Since the first slot pipe 5 and the second slot pipe 6 are located in the tooth groove 21 and the yoke groove 22 of the stator core 2, respectively, they have a large contact area with the stator core 2 and simultaneously dissipate heat from both the inner and outer sides of the stator core 2, resulting in high heat dissipation efficiency of the stator core 2.

[0042] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A permanent magnet motor stator, characterized in that, include: A stator assembly includes a stator frame and a stator core connected to each other. The stator frame has a cavity for accommodating the stator core. The inner and outer walls of the stator core are respectively provided with toothed grooves and yoke grooves along their circumferences. A cooling water circuit assembly includes an inlet pipe, an outlet pipe, a first slot pipe, and a second slot pipe. The inlet pipe and the outlet pipe are spaced apart on the stator base. The first slot pipe is located in the tooth groove, and the inlet and outlet of the first slot pipe are respectively connected to the inlet of the inlet pipe and the inlet of the second slot pipe. The second slot pipe is located in the yoke groove, and the outlet of the second slot pipe is connected to the outlet pipe. The cooling water circuit assembly also includes a sleeve, the first slotted tube includes a first section and a second section that are perpendicular to each other, the first section is located in the toothed groove, the second slotted tube includes a third section and a fourth section that are perpendicular to each other, the third section is located in the yoke groove, and the second section and the fourth section are detachably inserted into both ends of the sleeve. The first slotted tube includes a first section and a second section that are perpendicular to each other. The first section is located in the tooth groove. The second slotted tube includes a third section and a fourth section that are perpendicular to each other. The third section is located in the yoke groove. The second section and the fourth section are connected by welding. The cooling water circuit assembly also includes a yoke tube, which is located in the yoke groove, and the inlet and outlet of the yoke tube are respectively connected to the inlet pipe and the outlet pipe; The yoke tube has multiple U-shaped bending units, which are located in multiple yoke grooves; The number of yoke tubes and the number of second slot tubes are both multiple. The multiple yoke tubes are arranged around the periphery of the stator core, and the multiple yoke tubes and the multiple second slot tubes fill all the yoke slots of the stator core.

2. The permanent magnet motor stator according to claim 1, characterized in that, The first slotted tube also includes several U-shaped tube units, which are located in multiple slots.

3. The permanent magnet motor stator according to claim 2, characterized in that, There are multiple first slot tubes, which are arranged in an alternating manner around the periphery of the stator core through their respective U-shaped tube units, and the multiple first slot tubes fill the toothed grooves on the inner side of the stator core.

4. The permanent magnet motor stator according to claim 3, characterized in that, The number of the second slotted tubes is multiple and the same as the number of the first slotted tubes. The multiple second slotted tubes are located in multiple yoke slots, and the multiple second slotted tubes are correspondingly connected to multiple first slotted tubes.

5. The permanent magnet motor stator according to claim 1, characterized in that, Both the inlet pipe and the outlet pipe are circular and are snapped into the stator base. Both the inlet pipe and the outlet pipe are located outside the accommodating cavity.

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