Stator structure, permanent magnet motor and compressor

Abstract

The invention provides a stator structure, a permanent magnet motor and a compressor. The stator structure comprises a stator support, the stator support comprises a first stator support and a second stator support, the first stator support and the second stator support are coaxially arranged and fixedly connected, and the first stator support is arranged in the second stator support; the first stator support comprises a cylindrical first shell with the hollow interior and a plurality of first partition plates, and the first partition plates are arranged in the circumferential direction of the outer wall of the first shell and extend outwards in the radial direction of the first shell. The second stator bracket comprises a second shell, the second shell is fixed on the inner wall of the motor shell, and the second shell and the two adjacent first partition plates are encircled to form a fixed part; the stator core comprises a plurality of stator teeth, and each stator tooth is fixed in one fixing part; and a plurality of stator coils, wherein each stator tooth is wound with the stator coil. The stator provided by the invention is simple in structure, convenient to install, light in weight and small in size, and can improve the slot fullness rate of the stator and improve the power density of the motor.

Description

Technical Field

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

[0002] An electric motor is a rotary electric machine that converts electrical energy into mechanical energy. Permanent magnet synchronous motors (PMSMs) use permanent magnets for excitation, resulting in a simpler motor structure, reduced manufacturing and assembly costs, and improved efficiency and power density due to the absence of excitation current and losses. With its high efficiency, high power, simple structure, and significant energy-saving effects, PMSMs are increasingly widely used in industrial production and daily life.

[0003] Most current disc motor stator structures adopt a yoke structure, where all the teeth are connected together to form a whole, which is part of the motor's magnetic circuit and also strengthens the overall stator rigidity. The advantage of this structure is its simplicity and ease of installation and fixation of the stator as a whole. The disadvantage is that it requires a large amount of iron core and the stator slot fill factor cannot be too high. At the same time, there are also yokeless modular structures. The main method is to design a special housing to fix the stator teeth together, but the structure of this special housing is complex and the installation process is cumbersome.

[0004] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of the present invention, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0005] To address the problems in the prior art, the present invention aims to provide a stator structure, a permanent magnet motor, and a compressor, which simplifies the stator structure and the process steps during stator structure installation.

[0006] This invention provides a stator structure, comprising:

[0007] A stator support includes a first stator support and a second stator support. The first stator support and the second stator support are coaxially arranged and fixedly connected, and the first stator support is disposed inside the second stator support. The first stator support includes a hollow, cylindrical first shell and a plurality of first partitions. The first partitions are arranged circumferentially along the outer wall of the first shell and extend outward in the radial direction of the first shell. The second stator support includes a second shell, which is fixed to the inner wall of the motor housing. The second shell and two adjacent first partitions together form a fixing part.

[0008] The stator core includes a plurality of stator teeth, each of which is fixed within the fixing part;

[0009] Multiple stator coils, with one stator coil wound on each of the stator teeth.

[0010] In some embodiments, the first partition abuts against the inner wall of the second housing to fix the first stator support and the second stator support together.

[0011] In some embodiments, the second stator support further includes a plurality of second partitions; the second partitions are arranged circumferentially along the inner wall of the second housing and extend inwardly in the radial direction of the second housing; the side of each first partition near the second stator support abuts against the side of each second partition near the first stator support.

[0012] In some embodiments, the included angle between two adjacent first partitions is a first included angle, and the included angle between two adjacent second partitions is a second included angle, wherein the first included angle is equal to the second included angle.

[0013] In some embodiments, the sidewalls of the first housing and / or the second housing are provided with through holes.

[0014] In some embodiments, the sidewalls of the first housing and / or the second housing are provided with reinforcing ribs, the width of which is greater than or equal to the width of the first partition or the second partition.

[0015] In some embodiments, the stator support is made of a non-magnetic metal or a non-magnetic plastic.

[0016] In some embodiments, the stator coils form a three-phase stator winding.

[0017] This invention also provides a permanent magnet motor, including a stator structure as described above and a rotor structure extending through both ends of the stator structure; the stator structure is fixed to the inner wall of the housing.

[0018] This invention also provides a compressor, including the permanent magnet motor described above.

[0019] The provided stator structure, permanent magnet motor, and compressor have the following advantages:

[0020] The stator core provided in this embodiment of the invention is a yokeless modular structure, which is simple in structure, light in weight, and small in size. Furthermore, the steps for installing the stator core using the stator support formed by the first stator support and the second stator support are simple, and the assembly of stator teeth is convenient. Attached Figure Description

[0021] Other features, objects, and advantages of the invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings.

[0022] Figure 1 This is a perspective view of a stator structure according to an embodiment of the present invention;

[0023] Figure 2 This is a cross-sectional view of a stator structure provided in an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the first stator support according to an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the second stator support according to an embodiment of the present invention.

[0026] Figure label:

[0027] 100 Stator Structure 12 Second Stator Support

[0028] 10 Stator Support 121 Second Housing

[0029] 11 First stator support 1211 Second through hole

[0030] 111 First shell 1212 Second reinforcing rib

[0031] 1111 First through hole 122 Second partition

[0032] 1112 First reinforcing rib; 1221 Second protrusion.

[0033] 112 First partition 20 Stator core

[0034] 1121 First protrusion 21 Stator tooth

[0035] 30 stator coils Detailed Implementation

[0036] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that the invention will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore repeated descriptions of them will be omitted. The words “or” and “or” in the specification may mean “and” or “or”.

[0037] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics represented in connection with that embodiment or example, which are included in at least one embodiment or example of this application. Furthermore, the specific features, structures, materials, or characteristics represented may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate different embodiments or examples represented in this application, as well as features of different embodiments or examples.

[0038] Furthermore, the terms "first" and "second" are used for illustrative purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the representation of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0039] To address the problems in the prior art, embodiments of the present invention provide a stator structure, comprising: a stator support, including a first stator support and a second stator support, the first stator support and the second stator support being coaxially arranged and fixedly connected, and the first stator support being disposed inside the second stator support; the first stator support including a hollow, cylindrical first shell and a plurality of first partitions, the first partitions being arranged circumferentially along the outer wall of the first shell and extending outward along the radial direction of the first shell; the second stator support including a second shell, the second shell being fixed to the inner wall of the motor housing, the second shell and two adjacent first partitions forming a fixing part; a stator core including a plurality of stator teeth, each stator tooth being fixed within the fixing part; and a plurality of stator coils, each stator tooth having one stator coil wound around it. The stator core provided in this embodiment of the invention is a yokeless splicing type, which is lightweight and small in size, and can improve the stator high slot fill factor and increase the power density of the motor; the stator teeth provided by the first stator bracket and the second stator bracket fixed splicing type are convenient, which can simplify the installation steps of the stator teeth and improve installation efficiency.

[0040] The stator structure of the present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments are not intended to limit the scope of protection of the present invention.

[0041] Figure 1 This is a perspective view of a stator structure according to an embodiment of the present invention; Figure 2 This is a cross-sectional view of a stator structure according to an embodiment of the present invention; Figure 3 A schematic diagram of a first stator support according to an embodiment of the present invention is shown; Figure 4A schematic diagram of a second stator support according to an embodiment of the present invention is shown. (In conjunction with...) Figures 1 to 4 Therefore, this embodiment of the invention provides a stator structure 100, including a stator support 10, a stator core 20, and a plurality of stator coils 30. The stator support 10 includes a first stator support 11 and a second stator support 12, which are coaxially arranged and fixedly connected, with the first stator support 11 located inside the second stator support 12. The first stator support 11 includes a hollow, cylindrical first shell 111 and a plurality of first partitions 112, which are arranged circumferentially along the outer wall of the first shell 111 and extend outwards along the radial direction of the first shell 111.

[0042] The second stator support 12 includes a second housing 121, which is fixed to the inner wall of the motor housing. The second housing 121 and two adjacent first partitions 112 together form a fixing part.

[0043] Stator core 20, multiple stator teeth 21, each stator tooth 21 is fixed in the fixing part;

[0044] Multiple stator coils 30, with a stator coil 30 wound around each stator tooth 21.

[0045] The stator core 20 provided by this invention is a spliced ​​type without a yoke, thus the stator structure is lightweight and small in size. The spliced ​​stator core 20 can also improve the stator slot fill factor and increase the power density of the motor. The spliced ​​stator core 20 is fixed and spliced ​​by the stator bracket 10. The stator bracket 10 has a simple structure and the process steps for fixing the stator core 20 are simple, which can improve the assembly efficiency of fixing the stator core 20. The stator core 20 is firmly fixed by the stator bracket 10, and the stator structure can be directly tested without setting the stator structure in the corresponding compressor for testing, which improves the convenience of stator structure testing.

[0046] Preferably, such as Figure 3 As shown, the first partition 112 has a first protrusion 1121 on both axial end faces of the first housing 111. The first protrusion 1121 extends in a first direction and a second direction away from the first partition 112. Here, the first direction is perpendicular to the first partition 112 and away from a first side of the first partition 112; the second direction is perpendicular to the first partition 112 and away from a second side of the first partition 112. The first protrusion 1121 is provided so that when the stator teeth 21 are assembled, at least a portion of the end face structure of the stator teeth 21 abuts against the first protrusion 1121, thereby restricting the axial movement of the stator teeth 21 and fixing the stator teeth 21 firmly.

[0047] Please continue reading. Figures 1 to 4The second stator support 12 further includes a plurality of second partitions 122; the second partitions 122 are arranged circumferentially along the inner wall of the second housing 121 and extend inwardly along the radial direction of the second housing 121. Preferably, the second partitions 122 are provided with second protrusions 1221 on the two end faces of the second housing 121 in the axial direction, and the second protrusions 1221 extend in a third direction and a fourth direction away from the second partitions 122. Here, the third direction is a direction perpendicular to the second partitions 122 and away from the first side of the second partitions 122; the fourth direction is a direction perpendicular to the second partitions 122 and away from the second side of the second partitions 122. The provision of the second protrusions 1221 allows at least a portion of the structure of the stator teeth 21 to abut against the second protrusions 1221 during assembly, and the second protrusions 1221 on the upper and lower end faces of the second partitions 122 can restrict the axial movement of the stator teeth 21, thus fixing the stator teeth 21 firmly. It should be noted that, since the first stator support 11 and the second stator support 12 need to be assembled together to fix the stator teeth 21, usually only one of the first stator support 11 and the second stator support 12 has a protrusion on its partition plate. For example, the first partition plate 112 of the first stator support 11 has a first protrusion 1121, and the second partition plate 122 of the second stator support 12 does not have a protrusion; or, the second partition plate 122 of the second stator support 12 has a second protrusion 1221, and the first partition plate 112 of the first stator support 11 does not have a protrusion.

[0048] Specifically, when fixing the stator teeth 21, each stator tooth 21 is first placed in the second partition 122 of the second stator bracket 12, and at least part of the structure of the stator tooth 21 abuts against the first protrusion 1121 and the second protrusion 1221. The second stator bracket 12 is used to connect the outer circles of the stator core 20 together and can position the assembly position of each stator tooth 21 to ensure the splicing accuracy of each stator tooth 21.

[0049] Furthermore, the first stator support 11 and the second stator support 12 are coaxially arranged and placed inside the second stator support 12, such that the side of each first partition 112 near the second stator support 12 and the side of each second partition 122 near the first stator support 11 are respectively abutted. At this time, the first stator support 11 and the second stator support 12 are tightly and fixedly connected, and each stator tooth 21 is fixed in the space formed by the first housing 111, the second housing 121, the two adjacent first partitions 112 and the two adjacent second partitions 122.

[0050] Please continue reading. Figure 1 , Figure 3 and Figure 4In this embodiment of the invention, the number of the first partition 112 and the second partition 122 is 12, but it is not limited to this. Those skilled in the art can set the number of the first partition 112 and the second partition 122 according to actual needs.

[0051] like Figure 2 As shown, in a preferred embodiment, the included angle between two adjacent first partitions 112 is a first included angle α1, and the included angle between two adjacent second partitions 122 is a second included angle α2. The first included angle α1 is equal to the second included angle α2, so as to ensure that when the first stator support 11 is placed inside the second stator support 12, the first partition 112 of the first stator support 11 and the second partition 122 of the second stator support 12 can abut against each other.

[0052] In some other embodiments, the second stator support 12 includes only the second housing 121. When the stator tooth 21 is fixed by the first stator support 11 and the second stator support 12, the first partition 112 abuts against the inner wall of the second housing 121 to fix the first stator support 11 and the second stator support 12. The fixing part formed by the corresponding first housing 111, the second housing 121 and the two adjacent first partitions 112 fixes the stator tooth 21.

[0053] like Figure 3 and Figure 4 As shown, through holes are provided on the side walls of the first housing 111 and the second housing 121. Specifically, as... Figure 3 As shown, the first housing 111 is provided with a first through hole 1111; as Figure 4 As shown, the second housing 121 is provided with a second through hole 1211. The first through hole 1111 and the second through hole 1211 can be used as heat dissipation holes to reduce the temperature of the motor during operation, improve the power output and efficiency of the motor, ensure that the motor can still operate stably under high load, and improve the service life of the motor. In some other embodiments, the first housing 111 and the second housing 121 may also be provided with the above-mentioned through hole.

[0054] like Figure 3 and Figure 4 As shown, reinforcing ribs are provided on the side walls of the first housing 111 and the second housing 121, and the width of the reinforcing ribs is greater than or equal to the width of the first partition 112 or the second partition 122. Specifically, as shown... Figure 3 As shown, the first housing 111 is provided with a first reinforcing rib 1112; as Figure 4As shown, the second housing 121 is provided with a second reinforcing rib 1212. The provision of the first reinforcing rib 1112 can improve the connection strength between the first partition 112 and the first housing 111, and the provision of the second reinforcing rib 1212 can improve the connection strength between the second partition 122 and the second housing 121. In some embodiments, the width of the first reinforcing rib 1112 is greater than or equal to the width of the first partition 112, and the width of the second reinforcing rib 1212 is greater than or equal to the width of the second partition 122; the specific width of the reinforcing rib can be adjusted according to actual needs, and no specific limitation is made here.

[0055] The stator support 10 is made of a non-magnetic metal or a non-magnetic plastic material, and the material has good rigidity and is not easily deformed. When the stator support 10 is made of a non-magnetic metal, it can be aluminum, copper, brass, nickel silver, etc. When the stator support 10 is made of a non-magnetic plastic, it can be an engineering plastic such as PEK (polyetherketone).

[0056] The stator coils 30 form a three-phase stator winding to generate a rotating magnetic field. Specifically, the three-phase stator winding includes a U-phase winding, a V-phase winding, and a W-phase winding. In this embodiment, every four stator coils 30 constitute one phase winding, that is, each phase winding includes four stator coils. The stator coils 30 in each phase winding can be connected in series or in parallel. Each phase winding includes at least two leads, which can be led out through the first through-hole 1111 or the second through-hole 1211. One lead in each phase winding is connected to the power supply, and the other lead is connected to the neutral point of the three-phase winding.

[0057] This invention provides a permanent magnet motor, including a stator structure 100 and a rotor as described above, with the rotor disposed inside the stator structure 100. The permanent magnet motor achieves the technical effects of the aforementioned stator structure, which will not be elaborated further here.

[0058] This invention also provides a compressor, including the permanent magnet motor described above. The compressor achieves all the technical effects of the aforementioned permanent magnet motor, which will not be elaborated further here.

[0059] In summary, the stator structure, permanent magnet motor, and compressor provided by this invention have the following advantages:

[0060] The stator core provided by this invention is a spliced ​​type without a yoke, resulting in a lightweight and compact stator structure. The spliced ​​stator core also improves the stator slot fill factor, increasing the power density of the motor. The spliced ​​stator core is fixed and spliced ​​using a stator bracket, which has a simple structure and streamlines the process of fixing the stator core, improving assembly efficiency. By firmly fixing the stator core with the bracket, the stator structure can be directly tested without requiring it to be placed in a compressor for testing, thus improving the convenience of stator structure testing.

[0061] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A stator structure, characterized by, The application relates to a stator structure of a permanent magnet motor. The stator structure comprises a first stator support and a second stator support, the first stator support is coaxially arranged with the second stator support and fixedly connected with the second stator support, and the first stator support is arranged in the interior of the second stator support; the first stator support comprises a first hollow cylindrical shell and a plurality of first partitions, the first partitions are arranged in the circumferential direction of the outer wall of the first shell and extend outward in the radial direction of the first shell; the second stator support comprises a second shell, and the second shell is fixed to the inner wall of a motor shell; the second shell and two adjacent first partitions form a fixed part. The stator structure further comprises a stator core and a plurality of stator coils, the stator core comprises a plurality of stator teeth, each stator tooth is fixed in the fixed part, and each stator tooth is wound with a stator coil. The first partitions abut against the inner wall of the second shell to fixedly connect the first stator support and the second stator support.

2. The stator structure of claim 1, wherein The second stator support further comprises a plurality of second partitions, the second partitions are arranged in the circumferential direction of the inner wall of the second shell and extend inward in the radial direction of the second shell, and each first partition is in abutment with each second partition on the side close to the second stator support.

3. The stator structure of claim 1, wherein The included angle between two adjacent first partitions is a first included angle, the included angle between two adjacent second partitions is a second included angle, and the first included angle is equal to the second included angle.

4. The stator structure of claim 3, wherein The side wall of the first shell and / or the second shell is provided with a through hole.

5. The stator structure of claim 3, wherein The side wall of the first shell and / or the second shell is provided with a reinforcing rib, and the width of the reinforcing rib is greater than or equal to the width of the first partition or the second partition.

6. The stator structure of claim 3, wherein The material of the stator support is a non-magnetic metal material or a non-magnetic plastic material.

7. The stator structure of claim 1, wherein The stator coils form a three-phase stator winding.

8. The stator structure of claim 1, wherein The application further relates to a rotor structure which is arranged through the two ends of the stator structure.

9. A permanent magnet electric machine characterized by, The application further relates to a permanent magnet motor comprising the stator structure of claim 9.

10. A compressor characterized by, ​

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