Stator assembly and permanent magnet motor

Abstract

The invention discloses a stator assembly and a permanent magnet motor, and relates to the technical field of permanent magnet motors, the stator assembly comprises a stator support cylinder, an outer stator core, an inner stator core and a stator armature winding; the outer-layer stator iron core is arranged on the outer side of the stator supporting cylinder, and the inner-layer stator iron core is arranged on the inner side of the stator supporting cylinder; and the stator armature winding is wound along the outer side of the outer-layer stator core and the inner side of the inner-layer stator core to form a back-wound runway-shaped coil. Compared with the prior art, the stator assembly provided by the invention can be applied to the permanent magnet motor, the inner-layer stator iron core, the outer-layer stator iron core and the stator supporting cylinder of the stator assembly are connected to form an integrated structure, and a plurality of holes can be formed in the stator supporting cylinder, so that a passage is provided for winding of a stator armature winding; and an armature winding structure without a tooth groove is conveniently adopted, so that tooth harmonic waves are fundamentally eliminated, and the vibration noise level of the permanent magnet motor is favorably reduced.

Description

Technical Field

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

[0002] Permanent magnet motors, due to their high torque density, high efficiency, high power density, and excellent dynamic performance, are widely used in various industrial fields such as ship propulsion, mining, metallurgical steel rolling, and wind power generation. With the expansion of their application areas and the increasing demands on the performance and environmental quality of electric drive systems, scholars both domestically and internationally are paying increasing attention to motor vibration and noise.

[0003] The prior art disclosed in announcement number CN212518557U is a stator core and a motor, including a first toothed portion and a yoke portion. The first toothed portion includes a first tooth and a connecting portion. One end of the first tooth is connected into a whole through the connecting portion, and there is a rectangular toothed groove between adjacent first teeth. The other end of the first tooth and the yoke portion are respectively provided with a first engaging portion and a second engaging portion that cooperate with each other. The first toothed portion and the yoke portion can be separably engaged through the first engaging portion and the second engaging portion. In view of the technical problem of the difficulty in the production of flat wire forming for new energy motors in the prior art, it can realize the separable engagement of the first toothed portion and the yoke portion, and can realize the production of flat wire winding from the yoke portion position. It can improve the performance of the motor while meeting the production process requirements.

[0004] However, the existing permanent magnet motor still has shortcomings. For example, its stator core has tooth grooves on the periphery, and the air gap of the tooth grooves contains a certain amount of tooth harmonics, which causes the permanent magnet motor to generate a lot of noise when it is working. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a stator assembly and a permanent magnet motor to solve the technical problem that the stator core of the permanent magnet motor has grooves on its periphery, and the air gap of the grooves contains a certain amount of tooth harmonics, which causes the permanent magnet motor to generate a large amount of noise when it is working.

[0006] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution: This invention provides a permanent magnet motor, comprising: Stator support cylinder; The outer stator core is located on the outside of the stator support cylinder; The inner stator core is located inside the stator support cylinder; and The stator armature winding is wound along the outer side of the outer stator core and the inner side of the inner stator core to form a back-wound racetrack-shaped coil.

[0007] In some embodiments, the stator assembly further includes a coil transition pad, which is detachably connected to the non-driving end of the stator support cylinder. The coil transition pad has a transition arc surface that connects the outer stator core and the inner stator core. The stator armature winding is made of Litz wire and wound along the outer stator core and the inner stator core and mounted on the transition arc surface.

[0008] In some embodiments, the coil transition pad is threaded to the non-driving end of the stator support cylinder by a plurality of countersunk screws.

[0009] In some embodiments, the stator assembly further includes a plurality of first positioning plates and a plurality of second positioning plates. The plurality of first positioning plates are evenly spaced around the outer side of the outer stator core, and a first slot is formed between adjacent first positioning plates. The plurality of second positioning plates are evenly spaced around the inner side of the inner stator core, and a second slot is formed between adjacent second positioning plates.

[0010] Secondly, the present invention also provides a permanent magnet motor, including a rotor assembly, a rotor support, and the aforementioned stator assembly, wherein the rotor assembly is rotatably connected to the rotor support, and the stator assembly is fixedly connected to the rotor support.

[0011] In some embodiments, the rotor assembly is a double-layer U-shaped structure, and the rotor assembly is inserted into the stator assembly.

[0012] In some embodiments, the rotor assembly includes a rotating shaft, an outer rotor yoke, an inner rotor yoke, an outer permanent magnet, and an inner permanent magnet. The outer rotor yoke and the inner rotor yoke are both disposed on the rotating shaft, which is rotatably connected to the rotor support.

[0013] In some embodiments, the inner rotor yoke is detachably connected to the rotor support by screws.

[0014] In some embodiments, the rotor support includes an L-shaped frame and a support rod. One end of the L-shaped frame is connected to the rotating shaft, and the other end is connected to the outer rotor yoke. Both ends of the support rod are detachably connected to the inner rotor yoke and the rotating shaft. The other end of the inner rotor yoke is detachably connected to the L-shaped frame by screws.

[0015] In some embodiments, the rotor support includes a cylinder, an end cover, a first bearing, and a second bearing; the stator assembly includes a stator support; the stator support and the end cover are detachably connected to both ends of the cylinder; and both ends of the rotating shaft are rotatably connected to the end cover and the stator support via the first bearing and the second bearing, respectively.

[0016] Compared with the prior art, the stator assembly provided by the present invention can be applied to permanent magnet motors. The stator assembly has an inner stator core, an outer stator core, and a stator support cylinder connected to form an integrated structure. By opening several holes on the stator support cylinder, a path is provided for winding the stator armature winding, which facilitates the use of a slotless armature winding structure, fundamentally eliminating tooth harmonics and helping to reduce the vibration and noise level of the permanent magnet motor. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the permanent magnet motor provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the stator assembly provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the stator assembly provided in an embodiment of the present invention when no stator armature winding is provided; Figure 4 This is a disassembly diagram of the positioning component provided in an embodiment of the present invention; Figure 5 This is a cross-sectional schematic diagram of the stator assembly provided in an embodiment of the present invention; Figure 6 This is a cross-sectional schematic diagram of the permanent magnet motor provided in an embodiment of the present invention; Figure 7 This is a cross-sectional schematic diagram of the rotor assembly provided in an embodiment of the present invention. Detailed Implementation

[0018] 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.

[0019] To address the technical problem that existing permanent magnet motors have toothed grooves on the periphery of the stator core, and the air gaps in these grooves contain a certain amount of tooth harmonics, resulting in significant noise during operation, this invention provides a permanent magnet motor that fundamentally eliminates the tooth harmonics generated during operation, thereby reducing the vibration and noise levels of the permanent magnet motor.

[0020] It should be noted that the stator assembly described in this invention is used in, but not limited to, permanent magnet motors. For ease of explanation, this invention will only use the application of a permanent magnet motor in a permanent magnet motor as an example. The principle of applying a permanent magnet motor to other types of equipment is essentially the same as that applied to a permanent magnet motor, and will not be described in detail here.

[0021] Please see Figures 1 to 5 , Figure 1This is a schematic diagram of the stator assembly 1 in one embodiment of the present invention. The stator assembly 1 is generally cylindrical with one end open. The stator assembly 1 includes a stator support cylinder 11, an outer stator core 12, an inner stator core 13, and a stator armature winding 14. The outer stator core 12 is located on the outside of the stator support cylinder 11. The inner stator core 13 is located on the inside of the stator support cylinder 11. The stator armature winding 14 is wound along the outside of the outer stator core 12 and the inside of the inner stator core 13 to form a back-wound racetrack-shaped coil.

[0022] In this embodiment, when the stator assembly 1 is energized, it can electromagnetically inductively induce the corresponding rotor to drive the rotor to rotate, providing the power source for the rotor rotation. Specifically, the stator armature winding 14 of the stator assembly 1 generates a magnetic field when energized, driving the rotor to rotate through electromagnetic induction. The stator support cylinder 11 is cylindrical, with its inner side defined as the inner side and its outer side defined as the outer side. The inner stator core 13, the outer stator core 12, and the stator support cylinder 11 are connected to form an integral structure. By opening several holes in the stator support cylinder 11, a path is provided for the winding of the armature winding, facilitating the use of a slotless armature winding structure, fundamentally eliminating tooth harmonics, thereby reducing the vibration and noise level of the permanent magnet motor.

[0023] In one embodiment, please refer to Figure 4 and Figure 5 The stator assembly 1 also includes a coil transition pad 15, which is detachably connected to the non-driving end of the stator support cylinder 11. The coil transition pad 15 has a transition arc surface 151, which connects the outer stator core 12 and the inner stator core 13. The stator armature winding 14 is wound with Litz wire along the outer stator core 12 and the inner stator core 13 and mounted on the transition arc surface 151. In this embodiment, the transition arc surface 151 is semi-circular to facilitate the transition of the Litz wire of the stator armature winding 14 from the outer stator core 12 to the inner stator core 13 during installation. The Litz wire is arranged along the axial direction of the stator assembly 1. To prevent damage to the winding insulation during the winding of the stator armature winding 14, the edges of the stator support cylinder 11 and the winding hole edges can be polished to ensure a smooth, burr-free surface transition. The coil transition pad 15 is detachably connected to the non-driving end of the stator support cylinder 11 so as to be easily removed or installed as needed.

[0024] Further, please refer to Figure 5The coil transition pad 15 is threaded to the non-driving end of the stator support cylinder 11 by multiple countersunk screws 20. The coil transition pad 15 is made of insulating material and is installed on the non-driving end of the stator support cylinder 11 by countersunk screws 16. The non-driving end is circular, and multiple countersunk screws 20 are evenly arranged along the circumference of the non-driving end to facilitate fixing the coil transition pad 15 at multiple positions. The stator armature winding 14 is wound with Litz wire along the axial direction of the inner and outer stator cores, and finally wound into a back-wound racetrack-shaped coil.

[0025] Further, please refer to Figure 3 The stator assembly 1 also includes multiple first positioning plates 18 and multiple second positioning plates 19. The multiple first positioning plates 18 are evenly spaced around the outer side of the outer stator core 12, and a first slot 181 is formed between adjacent first positioning plates 18. The multiple second positioning plates 19 are evenly spaced around the inner side of the inner stator core 13, and a second slot 191 is formed between adjacent second positioning plates 19. The number of first positioning plates 18 and second positioning plates 19 is the same, and their positions are corresponding. The multiple first slots 181 and multiple second slots 191 are corresponding in position, so that each turn of Litz wire can be wound in the corresponding first slot 181 and second slot 191, and finally form a circle to form the stator armature winding 14. In this embodiment, by setting the first positioning plates 18 and the second positioning plates 19, the winding of the stator armature winding 14 can be guided and positioned, so that the Litz wire can be wound along a preset direction and position. The cross-sectional shape of the second positioning plate 19 is T-shaped, and the second slot 191 formed between two adjacent second positioning plates 19 can play a good role in positioning and limiting the Litz line.

[0026] In one embodiment, please refer to Figure 5 The stator assembly 1 also includes a stator bracket 17, with a movable slot 171 at its center. The movable slot 171 is used to install bearings and provides space for the rotor to rotate. The rotor rotates about the central axis of the movable slot 171, generating electromagnetic induction with the stator assembly 1. The stator support cylinder 11, outer stator core 12, and inner stator core 13 are all fixed to the stator bracket 17, and the stator assembly 1 remains stationary during operation.

[0027] Secondly, please refer to Figure 6 and Figure 7The present invention also provides a permanent magnet motor 2, including a rotor assembly 21, a rotor support, and the aforementioned stator assembly 1. The rotor assembly 21 is rotatably connected to the rotor support, and the rotor support is fixedly connected to the aforementioned stator assembly 1. In this embodiment, the rotor support serves to support the rotor assembly 21 and provide a rotational position for the rotor assembly 21. The stator assembly 1 adopts a slotless armature winding structure, which fundamentally eliminates tooth harmonics, thereby reducing the vibration and noise level of the permanent magnet motor and making it suitable for environments with high noise requirements.

[0028] In some embodiments, the rotor assembly 21 includes a shaft 211, an outer rotor yoke 214, an inner rotor yoke 215, an outer permanent magnet 216, and an inner permanent magnet 217. Both the outer rotor yoke 214 and the inner rotor yoke 215 are mounted on the shaft 211, which is rotatably connected to the rotor support. In this embodiment, multiple outer permanent magnets 216 and multiple inner permanent magnets 217 are provided. Multiple outer permanent magnets 216 are bonded to the outer rotor yoke 214 with adhesive. Multiple inner permanent magnets 217 are first bonded to the inner rotor yoke 215 with adhesive, and then secured with binding tape. The inner rotor yoke 215 is detachably connected to the rotor support by screws, allowing for easy assembly and disassembly.

[0029] In some embodiments, the rotor assembly 21 has a double-layer U-shaped structure and is inserted into the stator assembly 1. An installation space 23 is formed between the outer rotor yoke 214 and the inner rotor yoke 215 of the rotor assembly 21. This installation space 23 allows the stator assembly 1 to be inserted without contacting the rotor assembly 21. Since the outer permanent magnet 216 and the inner permanent magnet 217 are located on the outer and inner sides of the stator assembly 1, respectively, compared to the conventional technique of setting permanent magnets on only one side of the stator assembly 1, the rotor assembly 21 of this application can have a larger magnetic induction area with the stator assembly 1 during rotation, resulting in a higher output power for the permanent magnet motor.

[0030] In one embodiment, please refer to Figure 6 and Figure 7The rotor support includes an L-shaped frame 218 and a support rod 219. One end of the L-shaped frame 218 is fixedly connected to the rotating shaft 211, and the other end is connected to the outer rotor yoke 214. Both ends of the support rod 219 are detachably connected to the inner rotor yoke 215 and the rotating shaft 211. The other end of the inner rotor yoke 215 is detachably connected to the L-shaped frame 218 by screws. In this embodiment, both ends of the support rod 219 can be detachably connected to the rotating shaft 211 and the inner rotor yoke 215 using screws. Therefore, during installation, one end of the support rod 219 can be fixed to the rotating shaft 211 with screws first, then multiple inner permanent magnets 217 can be installed on the inner rotor yoke 215, and both ends of the inner rotor yoke 215 can be connected to the support rod 219 and the L-shaped frame 218 with screws. This allows for quick and convenient assembly and disassembly. Multiple screw holes can be made in the L-shaped frame 218, and support rods 219 of different lengths can be used to fix the inner rotor yoke 215 to adjust the distance between the inner permanent magnet 217 and the outer permanent magnet 216.

[0031] In one embodiment, please refer to Figure 6 and Figure 7 The rotor support also includes a cylindrical body 221, an end cap 222, a first bearing 223, and a second bearing 224. The stator assembly 1 includes the aforementioned stator support 17. The stator support 17 and the end cap 222 are detachably connected to the two ends of the cylindrical body 221. The two ends of the rotor assembly 21 are rotatably connected to the end cap 222 and the stator support 17 via the first bearing 223 and the second bearing 224, respectively. In this embodiment, the cylindrical body 221 is hollow with openings at both ends. The interior of the cylindrical body 221 is mainly used to accommodate the stator assembly 1 and the rotor assembly 21. The two ends of the cylindrical body 221 are encapsulated by the end cap 222 and the stator support 17. The rotating shaft 211, located outside the cylindrical body 221, can be used to connect the load. When the stator assembly 1 is energized, it can drive the rotor assembly 21 and the rotating shaft 211 to rotate via electromagnetic induction, and the rotating shaft 211 drives the load to rotate. The rotor support structure of this embodiment is simple, without any unnecessary structures, and is quick and easy to assemble and disassemble, making subsequent maintenance of the permanent magnet motor convenient.

[0032] 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: The stator assembly 1 provided by the present invention can be applied to a permanent magnet motor 2. The stator assembly 1 has an inner stator core 13, an outer stator core 12 and a stator support cylinder 11 connected to form an integral structure. By opening several holes on the stator support cylinder 11, a path is provided for the winding of the stator armature winding 14, which facilitates the use of a slotless armature winding structure, fundamentally eliminating tooth harmonics and helping to reduce the vibration and noise level of the permanent magnet motor 2.

[0033] 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 stator assembly, characterized in that, include: Stator support cylinder; The outer stator core is located on the outside of the stator support cylinder; The inner stator core is located inside the stator support cylinder; and The stator armature winding is wound along the outer side of the outer stator core and the inner side of the inner stator core to form a back-wound racetrack-shaped coil.

2. The stator assembly according to claim 1, characterized in that, The stator assembly also includes a coil transition pad, which is detachably connected to the non-driving end of the stator support cylinder. The coil transition pad has a transition arc surface that connects the outer stator core and the inner stator core. The stator armature winding is made of Litz wire and wound along the outer stator core and the inner stator core and mounted on the transition arc surface.

3. The stator assembly according to claim 2, characterized in that, The coil transition pad is threaded to the non-driving end of the stator support cylinder by multiple countersunk screws.

4. The stator assembly according to claim 1, characterized in that, The stator assembly further includes a plurality of first positioning plates and a plurality of second positioning plates. The plurality of first positioning plates are evenly spaced around the outer side of the outer stator core, and a first slot is formed between adjacent first positioning plates. The plurality of second positioning plates are evenly spaced around the inner side of the inner stator core, and a second slot is formed between adjacent second positioning plates.

5. A permanent magnet motor, characterized in that, It includes a rotor assembly, a rotor support, and a stator assembly as described in any one of claims 1-4, wherein the rotor assembly is rotatably connected to the rotor support, and the stator assembly is fixedly connected to the rotor support.

6. The permanent magnet motor according to claim 5, characterized in that, The rotor assembly has a double-layer U-shaped structure and is inserted into the stator assembly.

7. The permanent magnet motor according to claim 6, characterized in that, The rotor assembly includes a rotating shaft, an outer rotor yoke, an inner rotor yoke, an outer permanent magnet, and an inner permanent magnet. The outer rotor yoke and the inner rotor yoke are both located on the rotating shaft, which is rotatably connected to the rotor support.

8. The permanent magnet motor according to claim 7, characterized in that, The inner rotor yoke is detachably connected to the rotor support by screws.

9. The permanent magnet motor according to claim 8, characterized in that, The rotor support includes an L-shaped frame and a support rod. One end of the L-shaped frame is connected to the rotating shaft, and the other end is connected to the outer rotor yoke. Both ends of the support rod are detachably connected to the inner rotor yoke and the rotating shaft. The other end of the inner rotor yoke is detachably connected to the L-shaped frame by screws.

10. The permanent magnet motor according to claim 7, characterized in that, The rotor support includes a cylinder, an end cover, a first bearing, and a second bearing. The stator assembly includes a stator support. The stator support and the end cover are detachably connected to both ends of the cylinder. The two ends of the rotating shaft are rotatably connected to the end cover and the stator support through the first bearing and the second bearing, respectively.

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