Stator structure, permanent magnet motor and compressor

Abstract

The utility model 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 utility model has the advantages of simple structure, convenient installation and light weight, and can improve the slot fullness rate of the stator and improve the power density of the motor.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and in particular to a stator structure, a permanent magnet motor and a compressor. Background Art

[0002] A motor is a rotating electrical machine that converts electrical energy into mechanical energy. Permanent magnet synchronous motors (PMSMs) use permanent magnets for excitation, simplifying their structure and reducing machining and assembly costs. Furthermore, since no excitation current is required, there are no excitation losses, which improves the motor's efficiency and power density. With their high efficiency, high power, simple structure, and significant energy savings, PMSMs are gaining widespread application in both industrial production and everyday life.

[0003] Most of the current disc motor stator structures adopt a yoke structure, in which all the teeth are connected together through the stator yoke to form a whole, forming part of the motor magnetic circuit, and at the same time strengthening the stiffness of the entire stator. The advantages of this structure are simple structure and simple installation and fixation of the stator as a whole. The disadvantages are that the iron core consumption is large and the stator slot fill rate cannot be too high. At the same time, there are also yoke-free block structures. The method is mainly to fix the stator teeth together by designing a special casing, but the structure of this special casing is complex and the installation process is cumbersome.

[0004] It should be noted that the information disclosed in the above background technology section 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. Utility Model Content

[0005] In view of the problems in the prior art, the purpose of the present invention is to provide a stator structure, a permanent magnet motor and a compressor, which simplify the stator structure and simplify the process steps when installing the stator structure.

[0006] The present invention provides a stator structure, comprising:

[0007] The stator support includes 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 includes a first cylindrical shell with a hollow interior and a plurality of first baffles, the first baffles being arranged circumferentially along the outer wall of the first shell and extending outward in the radial direction of the first shell; the second stator support includes a second shell, the second shell being fixed to the inner wall of the motor shell, the second shell and two adjacent first baffles enclosing a fixed portion;

[0008] a stator core comprising a plurality of stator teeth, each of the stator teeth being fixed in the fixing portion;

[0009] A plurality of stator coils are provided, with one stator coil being wound around each stator tooth.

[0010] In some embodiments, the first partition abuts against the inner wall of the second shell to fixedly connect the first stator bracket and the second stator bracket.

[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 shell and extend inwardly in the radial direction of the second shell; a side of each first partition close to the second stator support is correspondingly abutted against a side of each second partition close to the first stator support.

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

[0013] In some embodiments, a through hole is provided on the side wall of the first shell and / or the second shell.

[0014] In some embodiments, a reinforcing rib is provided on the side wall of the first shell and / or the second shell, and the width of the reinforcing rib is greater than or equal to the width of the first partition plate or the second partition plate.

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

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

[0017] An embodiment of the present invention further provides a permanent magnet motor, comprising the 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 casing.

[0018] An embodiment of the present invention further provides a compressor, comprising the permanent magnet motor as described above.

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

[0020] The stator core provided by the embodiment of the utility model is a yokeless block structure with a simple structure, light weight, and small size. The stator bracket formed by the first stator bracket and the second stator bracket has simple steps for installing the stator core and convenient assembly of the stator teeth. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0022] Figure 1 This is a three-dimensional diagram of the stator structure of an embodiment of the present utility model;

[0023] Figure 2 This is a cross-sectional view of a stator structure provided by one embodiment of the present utility model;

[0024] Figure 3 1 is a schematic diagram of a first stator bracket according to an embodiment of the present invention;

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

[0026] Reference numerals:

[0027] 100 stator structure 12 second stator bracket

[0028] 10 stator bracket 121 second housing

[0029] 11 First stator bracket 1211 Second through hole

[0030] 111 first shell 1212 second reinforcement rib

[0031] 1111 first through hole 122 second partition

[0032] 1112 first reinforcement rib 1221 second protrusion

[0033] 112 First diaphragm 20 Stator core

[0034] 1121 First protrusion 21 Stator tooth

[0035] 30 stator coil DETAILED DESCRIPTION

[0036] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art. In the figures, identical reference numerals denote identical or similar structures, and thus repetitive descriptions thereof will be omitted. The use of "or" or "alternative" in this specification may mean "and" or "or."

[0037] In the description of this application, reference to the terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of this application. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and integrate different embodiments or examples described in this application, as well as features of different embodiments or examples, unless otherwise contradictory.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include at least one such feature. In the context of this application, "plurality" means two or more, unless otherwise specifically defined.

[0039] In response to the problems in the prior art, an embodiment of the present invention provides a stator structure, including: a stator bracket, including a first stator bracket and a second stator bracket, the first stator bracket and the second stator bracket are coaxially arranged and fixedly connected, and the first stator bracket is arranged inside the second stator bracket; the first stator bracket includes a first shell with a hollow interior and a cylindrical shape 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 bracket includes a second shell, the second shell is fixed to the inner wall of the motor shell, and the second shell and two adjacent first partitions together form a fixed part; a stator core, including a plurality of stator teeth, each of the stator teeth is fixed in the fixed part; a plurality of stator coils, one stator coil is wound around each of the stator teeth. The stator core provided in the embodiment of the present invention is of yokeless splicing type, light in weight and small in size, which can improve the stator high slot fill rate and enhance the power density of the motor; the stator teeth provided by the first stator bracket and the second stator bracket are fixedly spliced, which is convenient and 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 three-dimensional diagram of the stator structure of an embodiment of the present utility model; 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 bracket according to an embodiment of the present invention is shown; Figure 4The figure shows a schematic diagram of the second stator bracket of an embodiment of the present invention. Figures 1 to 4 It can be seen that the embodiment of the present invention provides a stator structure 100, including a stator bracket 10, a stator core 20 and a plurality of stator coils 30. The stator bracket 10 includes a first stator bracket 11 and a second stator bracket 12. The first stator bracket 11 and the second stator bracket 12 are coaxially arranged and fixedly connected, and the first stator bracket 11 is arranged inside the second stator bracket 12. The first stator bracket 11 includes a first shell 111 with a hollow interior and a cylindrical shape and a plurality of first partitions 112. The first partitions 112 are arranged circumferentially along the outer wall of the first shell 111 and extend outward in the radial direction of the first shell 111.

[0042] The second stator bracket 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 fixed portion.

[0043] A stator core 20, a plurality of stator teeth 21, each stator tooth 21 being fixed in a fixed portion;

[0044] A plurality of stator coils 30 are wound around each stator tooth 21 .

[0045] The stator core 20 provided by the present invention is of a spliced type and has no yoke, so the stator structure is light in weight and small in size. The spliced stator core 20 can also improve the stator slot fill rate and enhance the power density of the motor. The spliced stator core 20 is fixed and spliced by the stator bracket 10. The structure of the stator bracket 10 is simple, and the process steps for fixing the stator core 20 are simple, which can improve the assembly efficiency of the fixed 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 detection and testing, thereby improving the convenience of stator structure detection.

[0046] Preferably, if Figure 3 As shown, first protrusions 1121 are provided on both axial end surfaces of the first housing 111. First protrusions 1121 extend in a first direction and a second direction away from the first protrusion 112. The first direction is perpendicular to the first protrusion 112 and away from the first side of the first protrusion 112; the second direction is perpendicular to the first protrusion 112 and away from the second side of the first protrusion 112. The provision of first protrusions 1121 ensures that, during assembly, at least a portion of the end surface structure of the stator tooth 21 abuts against the first protrusions 1121. This, in turn, limits axial movement of the stator tooth 21, securing the stator tooth 21 securely.

[0047] Please continue reading Figures 1 to 4 The second stator support 12 also includes a plurality of second baffles 122. The second baffles 122 are arranged circumferentially along the inner wall of the second housing 121 and extend radially inward from the second housing 121. Preferably, the second baffles 122 are provided with second protrusions 1221 on both axial end surfaces of the second housing 121. The second protrusions 1221 extend in a third direction and a fourth direction away from the second baffles 122. The third direction is perpendicular to the second baffles 122 and away from the first side of the second baffles 122; the fourth direction is perpendicular to the second baffles 122 and away from the second side of the second baffles 122. The arrangement of the second protrusions 1221 ensures that, during assembly, at least a portion of the stator teeth 21 abuts against the second protrusions 1221. The second protrusions 1221 on the upper and lower end surfaces of the second baffles 122 limit axial movement of the stator teeth 21, securing the stator teeth 21 securely. It should be noted that because the first stator bracket 11 and the second stator bracket 12 need to be assembled together to secure the stator teeth 21, generally, only one of the first stator bracket 11 and the second stator bracket 12 has a protrusion on its partition. For example, the first partition 112 of the first stator bracket 11 has a first protrusion 1121, while the second partition 122 of the second stator bracket 12 has no protrusion; or, the second partition 122 of the second stator bracket 12 has a second protrusion 1221, while the first partition 112 of the first stator bracket 11 has no 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 circle of the stator core 20 together, and can locate the assembly position of each stator tooth 21 to ensure the splicing accuracy of each stator tooth 21.

[0049] Furthermore, the first stator bracket 11 and the second stator bracket 12 are coaxially arranged and placed inside the second stator bracket 12, and the side of each first partition 112 close to the second stator bracket 12 is correspondingly abutted with the side of each second partition 122 close to the first stator bracket 11. At this time, the first stator bracket 11 and the second stator bracket 12 are fastened and fixedly connected, and each corresponding stator tooth 21 is fixed to the space enclosed by the first shell 111, the second shell 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 the embodiment of the present invention, the number of the first partitions 112 and the second partitions 122 is 12, but is not limited thereto. Those skilled in the art can set the number of the first partitions 112 and the second partitions 122 according to actual needs.

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

[0052] In other embodiments, the second stator bracket 12 only includes the second shell 121. When the stator teeth 21 are fixed using the first stator bracket 11 and the second stator bracket 12, the first partition 112 abuts against the inner wall of the second shell 121 to fix the first stator bracket 11 and the second stator bracket 12 together. The corresponding fixing portion formed by the first shell 111, the second shell 121 and the two adjacent first partitions 112 fixes the stator teeth 21.

[0053] like Figure 3 and Figure 4 As shown, through holes are provided on the side walls of the first shell 111 and the second shell 121. Figure 3 As shown, the first shell 111 is provided with a first through hole 1111; 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 serve as heat dissipation holes, reducing the operating temperature of the motor, improving the motor's power output and efficiency, ensuring stable operation under high loads, and extending the motor's service life. In other embodiments, one of the first housing 111 and the second housing 121 can be provided with the above-mentioned through hole.

[0054] like Figure 3 and Figure 4 As shown, the side walls of the first shell 111 and the second shell 121 are provided with reinforcing ribs, 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. Figure 3 As shown, the first shell 111 is provided with a first reinforcing rib 1112; Figure 4As shown, second shell 121 is provided with second reinforcing ribs 1212. The provision of first reinforcing ribs 1112 can improve the connection strength between first partition 112 and first shell 111, and the provision of second reinforcing ribs 1212 can improve the connection strength between second partition 122 and second shell 121. In some embodiments, the width of first reinforcing ribs 1112 is greater than or equal to the width of first partition 112, and the width of second reinforcing ribs 1212 is greater than or equal to the width of second partition 122. The specific width of the reinforcing ribs can be adjusted according to actual needs and is not specifically limited here.

[0055] The stator bracket 10 is made of a non-magnetic metal or plastic material, which has good rigidity and is not easily deformed. Non-magnetic metal materials can include aluminum, copper, brass, nickel silver, and the like. Non-magnetic plastic materials can include engineering plastics such as PEK (polyether ketone).

[0056] The stator coil 30 forms a three-phase stator winding for generating 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 a 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, and each phase winding includes at least two lead wires, which can be led out through the first through hole 1111 or the second through hole 1211. One lead wire in each phase winding is connected to the power supply, and the other lead wire is connected to the neutral point of the three-phase winding.

[0057] The embodiment of the present invention provides a permanent magnet motor, comprising the stator structure 100 and a rotor as described above, wherein the rotor is disposed inside the stator structure 100. The permanent magnet motor can achieve the technical effects of the stator structure described above, which will not be described in detail here.

[0058] The present invention also provides a compressor comprising the permanent magnet motor described above. The compressor can achieve all the technical effects of the permanent magnet motor described above, which will not be described in detail here.

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

[0060] The stator core provided by the utility model is of spliced type and has no yoke, so the stator structure is light in weight and small in size. The spliced stator core can also improve the stator slot fill rate and enhance the power density of the motor. The spliced stator core is fixed and spliced by a stator bracket. The structure of the stator bracket is simple, and the process steps for fixing the stator core are simple, which can improve the assembly efficiency of the fixed stator core. The stator core is firmly fixed by the stator bracket, and the stator structure can be directly tested without placing the stator structure in the corresponding compressor for detection and testing, thereby improving the convenience of stator structure detection.

[0061] The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A stator structure, characterized in that: include: The stator support includes 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 includes a first cylindrical shell with a hollow interior and a plurality of first baffles, the first baffles being arranged circumferentially along the outer wall of the first shell and extending 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 shell; the second shell and two adjacent first baffles together form a fixed portion; The stator core includes a plurality of stator teeth, each of the stator teeth being fixed in one of the fixing portions; A plurality of stator coils are provided, with one stator coil being wound around each stator tooth.

2. The stator structure according to claim 1, characterized in that The first partition plate abuts against the inner wall of the second shell to fixedly connect the first stator bracket and the second stator bracket.

3. The stator structure according to claim 1, characterized in that The second stator bracket further includes a plurality of second partitions; the second partitions are arranged circumferentially along the inner wall of the second shell and extend inwardly in the radial direction of the second shell; a side of each first partition close to the second stator bracket is correspondingly abutted against a side of each second partition close to the first stator bracket.

4. The stator structure according to claim 3, characterized in that 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.

5. The stator structure according to claim 3, characterized in that: A through hole is provided on the side wall of the first shell and / or the second shell.

6. The stator structure according to claim 3, characterized in that A reinforcing rib is provided on the side wall of the first shell and / or the second shell, and the width of the reinforcing rib is greater than or equal to the width of the first partition plate or the second partition plate.

7. The stator structure according to claim 1, characterized in that The stator bracket is made of a non-magnetic metal material or a non-magnetic plastic material.

8. The stator structure according to claim 1, characterized in that The stator coils form a three-phase stator winding.

9. A permanent magnet motor, characterized in that: It comprises the stator structure according to any one of claims 1 to 8 and a rotor structure passing through both ends of the stator structure.

10. A compressor, characterized in that: Comprising the permanent magnet motor as claimed in claim 9.

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