Electric motor and compressor

Abstract

The present application relates to the technical field of compressors. Disclosed are an electric motor and a compressor. The electric motor comprises a rotor and a stator, wherein the rotor and the stator cooperate to enable the rotor to rotate about a first axis; the stator comprises a plurality of pieces of magnetic steel stacked in sequence in the direction of the first axis, each piece of magnetic steel is provided with a first through hole extending in the direction of the first axis, and the first through holes of the plurality of pieces of magnetic steel are in communication with each other in sequence to form an airflow channel; the stator is provided with oil-collecting recesses, and the oil-collecting recesses are recessed in the radial direction of the airflow channel from the inner wall surface of the airflow channel and extend in the circumferential direction of the airflow channel; any two adjacent pieces of magnetic steel among the plurality of pieces of magnetic steel are respectively first magnetic steel and second magnetic steel; and each oil-collecting recess comprises a first recess portion and a second recess portion, which are in communication with each other, the first recess portion being arranged on the first magnetic steel, and the second recess portion being arranged on the second magnetic steel.

Description

motors and compressors

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese Patent Application No. 202510073349.6, filed on January 16, 2025; and Chinese Patent Application No. 202520110912.8, filed on January 16, 2025; the entire contents of all the aforementioned Chinese patent applications are incorporated herein by reference. Technical Field

[0003] This application relates to the field of compressor technology, and more particularly to an electric motor and a compressor. Background Technology

[0004] A compressor typically includes a motor and a compression mechanism. The motor drives the compression mechanism to rotate, thereby compressing the medium inside the compressor. In one type of compressor, the compressor is used to compress a medium into a gaseous state, and the compressed gaseous medium moves upward to expel other media from the top of the compressor.

[0005] In related technologies, airflow channels are typically provided on the stator of the motor to facilitate the flow of gaseous media to the upper part of the compressor. However, as the gaseous media moves upward, it carries some lubricating oil. As the gaseous media moves upward, oil droplets are formed and then flow back to the compressor's oil sump along the airflow channel.

[0006] During the process of oil droplets flowing back through the airflow channel, some oil droplets will adhere to the inner surface of the airflow channel, thus forming an oil film. This will reduce the area of ​​the cross-section of the airflow channel (the interface perpendicular to the axial direction of the airflow channel) (i.e., the effective flow area), thereby affecting the flow rate of the gaseous medium and the compression efficiency of the compressor. Summary of the Invention

[0007] Some embodiments of this application provide an electric motor and a compressor that solve the problem of difficulty in forming an oil film on the inner wall surface of the airflow channel of the stator.

[0008] According to a first aspect of this application, an electric motor is provided, comprising a mover and a stator, the mover and stator cooperating to rotate the mover about a first axis; at least one of the mover and stator is provided with at least one airflow channel extending along the first axis; the stator and mover include a plurality of magnets stacked sequentially along the first axis, each magnet having a first through hole extending along the first axis, the first through holes of the plurality of magnets being sequentially connected to form the airflow channel; the airflow channel is provided with an oil collecting groove, the oil collecting groove being recessed radially from the inner wall surface of the airflow channel and extending circumferentially along the airflow channel; any two adjacent magnets among the plurality of magnets are respectively a first magnet and a second magnet; the oil collecting groove includes a first groove portion and a second groove portion connected to each other, the first groove portion being disposed on the first magnet and the second groove portion being disposed on the second magnet.

[0009] The motor provided in this application, by setting a first through hole in the magnet and stacking multiple magnets, forms an airflow channel after the first through holes of the multiple magnets are connected. When the motor is applied to a compressor, the gaseous medium compressed by the compressor can flow to the compressor outlet through the airflow channel, and the lubricating oil carried by the gaseous medium can be precipitated into oil droplets and then flow back through the airflow channel.

[0010] A first groove is provided on a first magnet, and a second groove is provided on a second magnet. The first groove and the second groove are connected to form an oil-collecting groove. The oil-collecting groove is formed by a radial indentation of the inner wall surface of the airflow channel and extends circumferentially along the airflow channel.

[0011] In this way, as the oil droplets flow back through the airflow channel, the oil droplets adhering to the inner surface of the airflow channel can enter the oil collection tank. Furthermore, the oil collection tank includes a first tank section and a second tank section, allowing for a larger opening. This enables the oil droplets to form a stable oil film within the oil collection tank, reducing the amount of oil droplets adhering to the inner surface of the airflow channel, ensuring the effective flow cross-section of the airflow channel, and guaranteeing the flow rate of the gaseous medium.

[0012] In some embodiments, a first groove extends along a first axis to the surface of the first magnet facing the second magnet; a second groove extends along the first axis to the surface of the second magnet facing the first magnet; and at least a portion of the projection of the first groove coincides with at least a portion of the projection of the second groove along the first axis. In this way, when the first and second magnets are stacked, the first and second grooves can connect to form a larger opening oil-collecting groove, making it easier for oil droplets to form an oil film within the oil-collecting groove during backflow.

[0013] In some embodiments, the first groove extends circumferentially around the airflow channel, and the second groove extends circumferentially around the airflow channel. This results in a larger oil-collecting groove formed by the connection of the first and second grooves, and a larger opening in the circumferential direction of the airflow channel. This allows oil droplets on the inner surface of the airflow channel to more easily enter the oil-collecting groove and form a more stable oil film, further reducing the amount of oil droplets adhering to the inner surface of the airflow channel and further ensuring the flow rate of the gaseous medium through the airflow channel.

[0014] In some embodiments, the surface of the first magnet facing the second magnet is a first surface, the first magnet has a first guide surface, the first guide surface is connected between the inner wall surface of the airflow channel and the first surface; the distance between the first guide surface and the first surface gradually increases along the direction of the inner wall surface of the airflow channel toward the axis of the airflow channel; the surface of the second magnet facing the first magnet is a second surface, the second magnet has a second guide surface, the second guide surface is connected between the inner wall surface of the airflow channel and the second surface; the distance between the second guide surface and the second surface gradually increases along the direction of the inner wall surface of the airflow channel toward the axis of the airflow channel; the first guide surface and the second guide surface define an oil accumulation groove.

[0015] In this way, by setting the first guide surface and the second guide surface, and along the direction of the inner wall of the airflow channel toward the axis of the airflow channel, the distance between the first guide surface and the second guide surface gradually increases, defining a larger opening oil collection groove, so that the oil droplets can form a stable oil film in the oil collection groove when flowing back.

[0016] Furthermore, the first and second guiding surfaces can also guide oil droplets on the inner wall of the airflow channel into the oil collection tank, thereby making it easier for oil droplets on the inner wall of the airflow channel to enter the oil collection tank, so as to further reduce the amount of oil droplets on the inner wall of the airflow channel.

[0017] In addition, the first guide surface is connected between the inner wall surface of the airflow channel and the first surface, and the second guide surface is connected between the inner wall surface of the airflow channel and the second surface. The magnet can be cut to process the first guide surface and the second guide surface, which facilitates the processing of the magnet and facilitates the formation of the oil collection groove.

[0018] In some embodiments, the first guiding surface is one of a first arc surface and a first flat surface; and / or, the second guiding surface is one of a second arc surface and a second flat surface. In this way, the first guiding surface being either a first arc surface or a first flat surface facilitates the processing of the first magnet to form the first guiding surface. The second guiding surface being either a second arc surface or a second flat surface facilitates the processing of the second magnet to form the second guiding surface. Furthermore, both the first arc surface or the first flat surface, and the second arc surface or the second flat surface, can effectively guide the oil droplets, improving the efficiency of the oil droplets entering the oil collection tank.

[0019] In addition, the first guide surface is set as a first arc surface and the second guide surface is set as a second arc surface, which can make the edges of the magnet smoother. When the magnet is manually handled, it can prevent the magnet from tearing the gloves worn by the handler. This can prevent the gloves from tearing and causing debris to fall into the compressor when the magnet is assembled, thus affecting the working performance of the compressor.

[0020] In some embodiments, the depth of the oil-collecting groove along the radial direction of the airflow channel is greater than or equal to 0.05 mm and less than or equal to 0.1 mm. A depth of 0.05 mm and less than or equal to 0.1 mm allows the oil-collecting groove to be within a suitable range, enabling oil droplets to accumulate and form a relatively stable oil film. This also prevents excessive cutting of the magnet, which would affect the area of ​​the magnet used for magnetic flux flow, thus ensuring magnetic flux and motor performance.

[0021] If the depth of the oil collection groove is too small, less than 0.05 mm, it will be difficult for oil droplets to accumulate in the groove to form an oil film, and the oil droplets will still affect the effective flow cross-section of the airflow channel. If the depth of the oil collection groove is too large, greater than 0.1 mm, it will cause excessive cutting of the magnet, affecting the magnetic flux flowing through the magnet.

[0022] In some embodiments, along the direction of the first axis, the height of the first guide surface is greater than or equal to 0.03 mm and less than or equal to 0.08 mm; and / or, along the direction of the first axis, the height of the second guide surface is greater than or equal to 0.03 mm and less than or equal to 0.08 mm. Setting the height of the first guide surface within the above range ensures that the first groove has a large opening, allowing oil droplets to form a relatively stable oil film within the oil collection groove, and preventing excessive cutting of the first magnet from affecting the magnetic flux flowing through it.

[0023] The height of the second guide surface is set within the above range to ensure that the second groove has a large opening, so that the oil droplets can form a more stable oil film in the oil collection groove, and to avoid the second magnet being cut too much, which would affect the magnetic flux flowing through the second magnet.

[0024] In some embodiments, the thickness of the magnet along the first axis is greater than or equal to 0.27 mm and less than or equal to 0.35 mm. If the magnet thickness is too small, less than 0.27 mm, defects are more likely to occur during processing due to the thinness of the magnet, thus increasing the processing cost. If the magnet thickness is too large, greater than 0.35 mm, the magnetic reluctance of the magnet will increase, resulting in increased iron loss and negatively impacting the motor's efficiency. Therefore, setting the magnet thickness within the aforementioned range can improve the yield rate of magnet processing and reduce the increase in iron loss, thereby ensuring the motor's operating efficiency.

[0025] In some embodiments, along the direction of the first axis, the thickness of the magnet is greater than or equal to 0.3 mm and less than or equal to 0.35 mm. This setting of the magnet thickness within the aforementioned range further ensures the magnet's thickness, thereby reducing the probability of defective products, increasing the yield rate of finished magnets, reducing iron loss in the magnets, and ensuring the motor's operating efficiency.

[0026] According to a second aspect of this application, a compressor is provided, the compressor including the motor described above.

[0027] It should be noted that the technical effects of the second implementation method can be found in the technical effects of the corresponding implementation method in the first aspect, and will not be repeated here. Attached Figure Description

[0028] Figure 1 is a schematic diagram of the compressor structure in some embodiments of this application;

[0029] Figure 2 is a cross-sectional view of the compressor in some embodiments of this application;

[0030] Figure 3 is an enlarged schematic diagram of point M in Figure 2;

[0031] Figure 4 is a schematic diagram of the flow direction of gaseous refrigerant in the stator channel in some embodiments of this application;

[0032] Figure 5 is a schematic diagram of the mechanism by which oil droplets form an oil film in the airflow channel in some embodiments of this application;

[0033] Figure 6 is a schematic diagram of the stator structure in a motor according to some embodiments of this application;

[0034] Figure 7 is an enlarged view of point N in Figure 6;

[0035] Figure 8 is a schematic diagram of the structure of oil droplets forming an oil film in an oil pool in some embodiments of this application;

[0036] Figure 9 is a schematic diagram of the magnet in Figure 6;

[0037] Figure 10 is a schematic diagram of the structure of a magnet in some embodiments of this application, in which the first guiding surface is a first arc surface and the second guiding surface is a second plane.

[0038] Figure 11 is a schematic diagram of the structure of the magnet in some embodiments of this application, in which the first guiding surface is a first plane and the second guiding surface is a second arc surface;

[0039] Figure 12 is a schematic diagram of the structure of the magnet in some embodiments of this application, in which the first guiding surface is a first plane and the second guiding surface is a second plane;

[0040] Figure 13 is a schematic diagram of the structure of the magnet before it is processed using stamping technology in some embodiments of this application;

[0041] Figure 14 is a schematic diagram of the structure of the magnet being processed under the support of a mold in some embodiments of this application;

[0042] Figure 15 is a schematic diagram of the structure of the magnet after it has been processed by stamping technology in some embodiments of this application;

[0043] Figure 16 is a schematic diagram of the oil tank depth provided in some embodiments of this application;

[0044] Figure 17 is a schematic diagram of the height of the first guide surface provided in some embodiments of this application;

[0045] Figure 18 is a schematic diagram of the second guide surface height provided in some embodiments of this application;

[0046] Figure 19 is one of the schematic diagrams of ferromagnetic thickness in some embodiments of this application;

[0047] Figure 20 is a second schematic diagram of ferromagnetic thickness in some embodiments of this application.

[0048] Reference numerals: 1. Container; 11. Enclosure; 12. Top plate; 13. Bottom plate; 2. Compression mechanism; 21. Cylinder; 22. Eccentric rotor; 3. Motor; 31. Mover; 311. Magnet; 3111. Airflow channel; 3112. First magnet; 3112a. First guide surface; 3113. Second magnet; 3113a. Second guide surface; 312. Oil collection tank; 312a. First groove; 312b. Second groove; 32. Stator; 4. Oil tank; 5. Section mold; 6. Upper mold; 7. Lower mold. Detailed Implementation

[0049] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0050] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0051] 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 indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the invention, unless otherwise stated, "a plurality of" means two or more.

[0052] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Furthermore, when describing pipelines or channels, the terms "connection" and "linkage" as used in this application have the meaning of establishing electrical conductivity. The specific meaning needs to be understood in conjunction with the context.

[0053] In some embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design described as "exemplary" or "for example" in some embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0054] As used herein, “about,” “approximately,” or “approximately” includes the stated value and the average value within an acceptable range of deviation from the given value, wherein the acceptable range of deviation is determined by a person skilled in the art taking into account the measurement under discussion and the error associated with the measurement of the given quantity (i.e., the limitations of the measurement system).

[0055] A compressor typically includes a motor and a compression mechanism. The motor drives the compression mechanism to rotate, thereby compressing the medium inside the compressor. In one type of compressor, the compressor is used to compress the medium into a gaseous state and move the compressed gaseous medium upwards to discharge it from the top of the compressor.

[0056] In related technologies, airflow channels are typically provided on the stator of the motor to facilitate the flow of gaseous media to the upper part of the compressor. However, as the gaseous media moves upward, it carries some lubricating oil. As the gaseous media moves upward, oil droplets are formed and then flow back to the compressor's oil sump along the airflow channel.

[0057] During the process of oil droplets flowing back through the airflow channel, some oil droplets will adhere to the inner wall surface of the airflow channel, thus forming an oil film. This will reduce the area of ​​the cross-section of the airflow channel (the interface perpendicular to the axial direction of the airflow channel) (i.e., the effective flow area), thereby affecting the flow rate of the gaseous medium and the compression efficiency of the compressor.

[0058] Please refer to Figure 1, which is a schematic diagram of the compressor structure in some embodiments of this application. This application provides a compressor. The compressor can be used in refrigerators, air conditioners, and for gas compression, liquid compression, etc., in industrial production.

[0059] This application uses the application of a compressor in an air conditioner to compress the refrigerant inside the air conditioner as an example for illustration.

[0060] An air conditioner consists of an outdoor heat exchanger, an indoor heat exchanger, and a throttling valve. The compressor, indoor heat exchanger, throttling valve, and outdoor heat exchanger are connected in sequence via refrigerant pipes.

[0061] In cooling mode, the refrigerant is compressed by the compressor to form a high-temperature, high-pressure gaseous refrigerant. After flowing out of the compressor, the high-temperature, high-pressure gaseous refrigerant enters the outdoor heat exchanger, where it exchanges heat and condenses into a high-temperature, high-pressure liquid refrigerant, which then flows out of the outdoor heat exchanger.

[0062] The refrigerant flowing from the outdoor heat exchanger enters the expansion valve, where it is throttled and depressurized to form a low-temperature, low-pressure liquid refrigerant. This liquid refrigerant then flows out of the expansion valve and enters the indoor heat exchanger, where it undergoes heat exchange to form a low-temperature, low-pressure gaseous refrigerant. During this transition from liquid to gas, the refrigerant absorbs heat, thus lowering the temperature of the air outside the indoor heat exchanger. This cooled air then enters the room, further reducing the indoor temperature.

[0063] In heating mode, the refrigerant is compressed by the compressor to form a high-temperature, high-pressure gaseous refrigerant. This gaseous refrigerant flows out of the compressor and into the indoor heat exchanger, where it condenses into a high-temperature, high-pressure liquid refrigerant after heat exchange. It then flows out of the indoor heat exchanger. During this process, the refrigerant releases heat as it changes from gas to liquid, thus raising the temperature of the outside air. This warmer air then enters the room, further increasing the indoor temperature.

[0064] The refrigerant flowing out of the indoor heat exchanger enters the expansion valve, and after being throttled and depressurized by the expansion valve, it forms a low-temperature, low-pressure liquid refrigerant. The low-temperature, low-pressure liquid refrigerant then flows out of the expansion valve and enters the outdoor heat exchanger, where it undergoes heat exchange and forms a low-temperature, low-pressure gaseous refrigerant.

[0065] After the low-temperature, low-pressure gaseous refrigerant flows out of the outdoor heat exchanger, it flows back into the compressor and is compressed again.

[0066] The compressor can be either a single-rotor compressor or a twin-rotor compressor. The specific structure of the compressor is described below.

[0067] The compressor includes a container 1. Container 1 includes a surrounding plate 11, a top plate 12, and a bottom plate 13. The top plate 12 and the bottom plate 13 are spaced apart, and the thickness direction of the top plate 12 is consistent with the thickness direction of the bottom plate 13. The surrounding plate 11 surrounds the arrangement direction of the top plate 12 and the bottom plate 13 and is connected to both the top plate 12 and the bottom plate 13, thereby forming a sealed cavity.

[0068] In some embodiments, please refer to FIG2, which is a cross-sectional structural schematic diagram of the compressor in some embodiments of this application. The compressor further includes a sealed container 1 and a compression mechanism 2. The sealed container 1 forms a sealed cavity, and the compression mechanism 2 is located inside the sealed cavity. The compression mechanism 2 includes a cylinder 21 and an eccentric rotor 22. The eccentric rotor 22 is disposed inside the cylinder 21 and is capable of eccentric rotation within the cylinder 21.

[0069] In some embodiments, the compressor further includes a motor 3, which is disposed within a sealed cavity and located above the compression mechanism 2. The motor 3 is used to drive the eccentric rotor 22 to rotate.

[0070] Specifically, the motor 3 includes a stator 32 and a mover 31. The stator 32 is fixedly connected to the inner wall of the sealed container 1, and the mover 31 is rotatably connected inside the stator 32. The shaft of the mover 31 is connected to the eccentric rotor 22 of the compression mechanism 2. When the coil of the mover 31 is energized, the stator 32 can drive the mover 31 to rotate along the first axis through electromagnetic induction, thereby driving the eccentric rotor 22 to rotate.

[0071] In some implementations, please refer to Figure 2, and in conjunction with Figures 3 and 4. Figure 3 is an enlarged schematic diagram of point M in Figure 2; Figure 4 is a schematic diagram of the flow direction of gaseous refrigerant in the stator channel in some embodiments of this application. The stator has an airflow channel 3111, which penetrates the stator 32 along the direction of the first axis. The eccentric rotor 22 rotates eccentrically within the cylinder 21, compressing the refrigerant within the cylinder 21 to form a high-temperature, high-pressure gaseous refrigerant. Then, the high-temperature, high-pressure gaseous refrigerant flows from the airflow channel of the rotor 31 to the compressor outlet (X is the flow direction of the gaseous refrigerant).

[0072] In some embodiments, the compressor further includes an oil sump 4, which is disposed within a sealed cavity and located below the compressor. The oil sump 4 contains lubricating oil, and during the rotation of the eccentric rotor 22 driven by the motor 3, the lubricating oil in the oil sump 4 can be carried to the compression mechanism 2 to lubricate the compression mechanism 2.

[0073] Please refer to Figure 5, which is a schematic diagram of the mechanism for forming an oil film in the airflow channel in some embodiments of this application. Since the airflow channel 3111 is connected to the oil tank 4 through the space where the compression mechanism 2 is located, the gaseous refrigerant carries some lubricating oil as it flows out of the cylinder 21 and into the compressor outlet through the airflow channel 3111 (i.e., the gaseous refrigerant moves upward). The lubricating oil will precipitate oil droplets when it encounters cold during the upward movement. The oil droplets flow back to the oil tank 4 along the airflow channel 3111. During the return flow, the oil droplets will adhere to the inner wall of the airflow channel 3111. If too many oil droplets adhere to the inner wall of the airflow channel 3111, an oil film will be formed, which will reduce the effective cross-sectional area of ​​the gaseous refrigerant flowing in the airflow channel 3111, thereby affecting the flow rate of the gaseous refrigerant and thus affecting the efficiency of the compressor.

[0074] Based on this, please refer to Figures 6, 7, and 8. Figure 6 is a structural schematic diagram of the stator in a motor according to some embodiments of this application; Figure 7 is an enlarged schematic diagram of point N in Figure 6; and Figure 8 is a structural schematic diagram of oil droplets forming an oil film in an oil collection groove according to some embodiments of this application. The stator 32 includes a plurality of magnets 311 stacked sequentially along the direction of the first axis. Each magnet 311 has a first through hole extending along the direction of the first axis. The first through holes of the plurality of magnets 311 are sequentially connected to form an airflow channel 3111.

[0075] A first through hole is provided in the magnet 311, and multiple magnets 311 are stacked so that the first through holes of the multiple magnets 311 are connected to form an airflow channel 3111. When the motor is used in the compressor, the gaseous medium compressed by the compressor can flow to the compressor outlet through the airflow channel 3111, and the lubricating oil carried by the gaseous medium can be precipitated into oil droplets and then flow back through the airflow channel 3111.

[0076] The airflow channel 3111 is provided with an oil collection groove 312, which is recessed radially from the inner wall surface of the airflow channel 3111 and extends circumferentially along the airflow channel 3111.

[0077] During the process of oil droplets flowing back through the airflow channel 3111, the oil droplets adhering to the inner wall of the airflow channel 3111 can enter the oil collection tank 312 and form an oil film extending circumferentially along the airflow channel 3111 in the oil collection tank 312.

[0078] Any two adjacent magnets 311 among the plurality of magnets 311 are respectively the first magnet 3112 and the second magnet 3113; the oil collection tank 312 includes a first groove portion 312a and a second groove portion 312b that are connected to each other, the first groove portion 312a is provided on the first magnet 3112, and the second groove portion 312b is provided on the second magnet 3113.

[0079] The oil collection tank 312 includes a first tank portion 312a and a second tank portion 312b, which can make the oil collection tank 312 have a large opening, so that oil droplets can form a stable oil film in the oil collection tank 312, thereby reducing the amount of oil droplets adhering to the inner surface of the airflow channel 3111, ensuring the effective flow section of the airflow channel 3111, and ensuring the flow rate of the gaseous medium.

[0080] The number of oil collection tanks 312 is at least one. The number of oil collection tanks 312 can be one or more. The number of multiple oil collection tanks 312 can be 2, 3, 4, 5, 6, 7, 8, 9, etc.

[0081] In some embodiments, the mover 31 may also include a plurality of magnets 311 stacked sequentially along the direction of the first axis. The plurality of magnets 311 in the mover 31 may also be provided with first through holes, and the first through holes of the plurality of magnets 311 in the mover 31 being connected in sequence may also form an airflow channel 3111 extending along the direction of the first axis.

[0082] The airflow channel 3111 of the mover 31 can also be provided with an oil collection groove 312.

[0083] In some embodiments, please continue to refer to FIG6. The first groove 312a is recessed from the inner peripheral surface of the first magnet 3112 toward the outer peripheral surface of the first magnet 3112, and the first groove 312a extends along the direction of the first axis to the side surface of the first magnet 3112 facing the second magnet 3113.

[0084] The second groove 312b is recessed from the inner peripheral surface of the second magnet 3113 toward the outer peripheral surface of the second magnet 3113, and the second groove 312b extends along the direction of the first axis to the side surface of the second magnet 3113 facing the first magnet 3112.

[0085] Along the direction of the first axis, at least a portion of the projection of the first groove 312a coincides with at least a portion of the projection of the second groove 312b.

[0086] In this way, after the first magnet 3112 and the second magnet 3113 are stacked, the projections of the first groove 312a and the second groove 312b along the first axis at least partially overlap, so that the first groove 312a and the second groove 312b can be connected to form an oil-gathering groove 312 with a larger opening, which makes it easier for oil droplets to form an oil film in the oil-gathering groove 312 during reflux.

[0087] In some embodiments, the first groove 312a extends circumferentially along the airflow channel 3111, and the second groove 312b extends circumferentially along the airflow channel 3111.

[0088] The oil-collecting groove 312 formed after the first groove 312a and the second groove 312b are connected has a large space, and the opening of the oil-collecting groove 312 in the circumferential direction of the airflow channel 3111 is also large. This makes it easier for oil droplets on the inner surface of the airflow channel 3111 to enter the oil-collecting groove 312 and form a more stable oil film, so as to further reduce the amount of oil droplets attached to the inner surface of the airflow channel 3111 and further ensure the flow rate of the gaseous medium through the airflow channel 3111.

[0089] In some embodiments, please continue to refer to FIG6 and in conjunction with FIG7, FIG7 being an enlarged schematic diagram of N in the figure. The surface of the first magnet 3112 facing the second magnet 3113 is the first surface, and the first magnet 3112 has a first guide surface 3112a, which is connected between the inner wall surface of the airflow channel 3111 and the first surface.

[0090] Along the direction of the inner wall of the airflow channel 3111 toward the axis of the airflow channel 3111, the distance between the first guide surface 3112a and the first surface gradually increases.

[0091] The surface of the second magnet 3113 facing the first magnet 3112 is the second surface. The second magnet 3113 has a second guide surface 3113a, which is connected between the inner wall surface and the second surface of the airflow channel 3111.

[0092] Along the direction of the inner wall of the airflow channel 3111 toward the axis of the airflow channel 3111, the distance between the second guide surface 3113a and the second surface gradually increases.

[0093] The first guide surface 3112a and the second guide surface 3113a define the oil collection groove 312.

[0094] In this way, by setting the first guide surface 3112a and the second guide surface 3113a, and along the direction of the inner wall surface of the airflow channel 3111 toward the axis of the airflow channel 3111, the distance between the first guide surface 3112a and the second guide surface 3113a gradually increases, defining a larger opening oil collection groove 312, so that the oil droplets can form a stable oil film in the oil collection groove 312 when flowing back.

[0095] Furthermore, the first guide surface 3112a and the second guide surface 3113a can also guide the oil droplets on the inner wall surface of the airflow channel 3111 into the oil collection tank 312, thereby making it easier for the oil droplets on the inner wall surface of the airflow channel 3111 to enter the oil collection tank 312, so as to further reduce the amount of oil droplets on the inner wall surface of the airflow channel 3111.

[0096] In addition, the first guide surface 3112a is connected between the inner wall surface of the airflow channel 3111 and the first surface, and the second guide surface 3113a is connected between the inner wall surface of the airflow channel 3111 and the second surface. The magnet can be cut to process the first guide surface 3112a and the second guide surface 3113a, which facilitates the processing of the magnet and facilitates the formation of the oil collection groove 312.

[0097] It should be noted that, as shown in Figure 9, which is a structural schematic diagram of the magnet in Figure 6, for each magnet 311, guide surfaces are formed at both the upper and lower ends along the axial direction of the airflow channel 3111, and the guide surfaces extend circumferentially along the airflow channel 3111. One of the two guide surfaces of any magnet 311 is the first guide surface 3112a, and the other is the second guide surface 3113a.

[0098] Thus, for two adjacent magnets 311, the guiding surface of one magnet 311 toward the other magnet 311 is the first guiding surface 3112a, and the guiding surface of the other magnet 311 toward one magnet 311 is the second guiding surface 3113a. That is, the first magnet 3112 has the first guiding surface 3112a, and the second magnet 3113 has the second guiding surface 3113a.

[0099] In some embodiments, the shapes of the first guide surface 3112a and the second guide surface 3113a may be the same or different.

[0100] In some embodiments, the first guide surface 3112a is one of a first arc surface and a first plane.

[0101] The first guiding surface 3112a is a first arc surface or a first plane surface, which facilitates the processing of the first magnet 3112 to form the first guiding surface 3112a.

[0102] In some embodiments, the second guide surface 3113a is one of a second arc surface and a second plane.

[0103] The second guide surface 3113a is a second arc surface or a second plane surface, which facilitates the processing of the second magnet 3113 to form the second guide surface 3113a.

[0104] Furthermore, the first guiding surface 3112a being a first arc surface or a first plane, and the second guiding surface 3113a being a second arc surface or a second plane, can both effectively guide the oil droplets and improve the efficiency of the oil droplets entering the oil collection tank 312.

[0105] In some examples, please refer to Figure 9. The first guide surface 3112a can be a first arc surface, and the second guide surface 3113a can be a second arc surface.

[0106] The first guide surface 3112a is set as the first arc surface and the second guide surface 3113a is set as the second arc surface. This makes the edges of the magnet 311 relatively smooth. When the magnet 311 is manually handled, it can prevent the magnet 311 from tearing the gloves worn by the handler. Thus, when assembling the magnet 311, it can prevent the gloves from tearing and causing debris to fall into the compressor, affecting the working performance of the compressor.

[0107] In other examples, please refer to Figure 10, which is a schematic diagram of the structure of a magnet in some embodiments of this application, where the first guiding surface is a first arc surface and the second guiding surface is a second plane. The first guiding surface 3112a can be a first arc surface, and the second guiding surface 3113a can be a second plane.

[0108] In other examples, please refer to Figure 11, which is a schematic diagram of the structure of a magnet in some embodiments of this application, where the first guiding surface is a first plane and the second guiding surface is a second arc surface. The first guiding surface 3112a can be a first plane, and the second guiding surface 3113a can be a second arc surface.

[0109] In some other embodiments, please refer to Figure 12, which is a schematic diagram of the structure of the magnet in some embodiments of this application, where the first guiding surface is a first plane and the second guiding surface is a second plane. The first guiding surface 3112a can be a first plane, and the second guiding surface 3113a can be a second plane.

[0110] The first guide surface 3112a can be processed by chamfering or stamping technology, and the second guide surface 3113a can also be processed by chamfering or stamping technology.

[0111] For example, the first guide surface 3112a is processed using stamping technology, and the second guide surface 3113a is also processed using stamping technology.

[0112] Please refer to Figure 13, which is a schematic diagram of the structure of the magnet in some embodiments of this application before processing using stamping technology. Before processing the first guide surface 3112a and the second guide surface 3113a using stamping technology, it is necessary to determine the cross-sectional shape of the first guide surface 3112a and the second guide surface 3113a, so that the first guide surface 3112a is a first arc surface or a first plane, and the second guide surface 3113a is a second arc surface or a second plane. After determining the cross-sectional shape of the first guide surface 3112a and the second guide surface 3113a, it is necessary to manufacture the cross-sectional mold 5.

[0113] Please refer to Figure 14, which is a schematic diagram of the structure of a magnet being processed under mold clamping in some embodiments of this application. During processing, the magnet is clamped by the upper mold 6 and the lower mold 7. Then, the cross-section mold 5, from the side away from the magnet 311, presses against the lower edge of the first surface of the magnet 311, that is, the edge of the cross-section mold 5 near the magnet 311 and the edge of the cross-section mold 5 away from the magnet 311, to perform stamping processing and obtain the first guide surface 3112a. Then, the magnet is clamped by the upper mold and the lower mold. Then, the cross-section mold 5, from the side away from the magnet 311, presses against the upper edge of the second surface of the magnet 311, that is, the edge of the cross-section mold 5 near the magnet 311 and the edge of the cross-section mold 5 away from the magnet 311, to perform stamping processing and obtain the second guide surface 3113a.

[0114] Please refer to Figure 15, which is a schematic diagram of the structure of the magnet after being processed by stamping technology in some embodiments of this application. The magnet 311 processed by stamping technology can obtain a preset cross-sectional shape of the first guide surface 3112a and the second guide surface 3113a.

[0115] While using stamping technology to obtain the first guide surface 3112a and the second guide surface 3113a, burrs on the magnet 311 can also be removed, preventing burrs from falling off the magnet 311 and mixing into the oil droplets, which would then enter the oil tank 4 with the oil droplets and affect the operation of the compressor.

[0116] In some embodiments, please refer to FIG16, which is a schematic diagram of the depth of the oil-collecting groove 312 provided in some embodiments of this application. Along the radial direction of the airflow channel 3111, the depth a of the oil-collecting groove 312 is greater than or equal to 0.05 mm and less than or equal to 0.1 mm (a in FIG16 is the depth of the oil-collecting groove 312).

[0117] The depth of the oil collection groove 312 is greater than or equal to 0.05 mm and less than or equal to 0.1 mm. This allows the depth of the oil collection groove 312 to be within a suitable range, so that oil droplets can accumulate in the oil collection groove 312 to form a relatively stable oil film. It also prevents the magnet 311 from being cut too much, which would affect the area of ​​the magnet 311 used for the flow of magnetic flux, thus ensuring the magnetic flux and the performance of the motor.

[0118] If the depth of the oil collection groove 312 is too small, less than 0.05 mm, it will be difficult for oil droplets to accumulate in the oil collection groove 312 to form an oil film, and the oil droplets will still affect the effective flow cross section of the airflow channel 3111. If the depth of the oil collection groove 312 is too large, greater than 0.1 mm, it will cause excessive cutting of the magnet 311, affecting the magnetic flux flowing through the magnet 311.

[0119] For example, the depth of the oil collection groove 312 along the radial direction of the airflow channel 3111 can be 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, or 0.1mm.

[0120] In particular, along the radial direction of the airflow channel 3111, when the depth of the oil collection groove 312 is less than 0.05 mm, the lubricating oil has difficulty flowing in the oil collection groove 312; when the depth of the oil collection groove 312 is greater than 0.1 mm, the magnetic flux density of the magnet 311 increases, and the iron loss of the magnet 311 increases.

[0121] In some embodiments, please refer to FIG17, which is a schematic diagram of the height of the first guide surface 3112a provided in some embodiments of this application. Along the direction of the first axis, the height b of the first guide surface 3112a is greater than or equal to 0.03 mm and less than or equal to 0.08 mm (b in FIG17 is the height of the first guide surface 3112a).

[0122] The height of the first guide surface 3112a is set within the range of greater than or equal to 0.03 mm and less than or equal to 0.08 mm. This ensures that the first groove 312a has a large opening, so that the oil droplets can form a relatively stable oil film in the oil collection groove 312, and avoids the first magnet 3112 being cut too much, which would affect the magnetic flux flowing through the first magnet 3112.

[0123] For example, the height of the first guide surface 3112a along the direction of the first axis can be 0.03mm, 0.04mm, 0.05mm, 0.06mm, 0.07mm, or 0.08mm.

[0124] In some embodiments, please refer to FIG18, which is a schematic diagram of the height of the second guide surface 3113a provided in some embodiments of this application. Along the direction of the first axis, the height c of the second guide surface 3113a is greater than or equal to 0.03 mm and less than or equal to 0.08 mm (c is the height of the second guide surface 3113a in FIG18).

[0125] The height of the second guide surface 3113a is set within the range of greater than or equal to 0.03 mm and less than or equal to 0.08 mm, which can ensure that the second groove 312b has a large opening, so as to ensure that the oil droplets can form a relatively stable oil film in the oil collection groove 312, and avoid the second magnet 3113 being cut too much, thus affecting the magnetic flux flowing through the second magnet 3113.

[0126] Along the direction of the first axis, the height of the second guide surface 3113a can be 0.03mm, 0.04mm, 0.05mm, 0.06mm, 0.07mm, or 0.08mm.

[0127] In some embodiments, please refer to FIG19, which is one of the schematic diagrams of ferromagnetic thickness in some embodiments of this application. The thickness d of the magnet 311 is greater than or equal to 0.27 mm and less than or equal to 0.35 mm (d is the thickness of the magnet 311 in FIG19).

[0128] If the thickness of magnet 311 is too small, less than 0.27mm, defects are more likely to occur during processing due to its thinness, increasing processing costs. If the thickness of magnet 311 is too large, greater than 0.35mm, the magnetic reluctance increases, leading to increased iron losses and negatively impacting motor efficiency. Therefore, setting the thickness of magnet 311 within the range of 0.27mm or greater and 0.35mm or less improves the yield rate during processing and prevents an increase in magnetic flux density, thus avoiding increased iron losses and ensuring motor efficiency.

[0129] The thickness of the 311 magnet can be 0.27mm, 0.28mm, 0.29mm, 0.30mm, 0.31mm, 0.32mm, 0.33mm, 0.34mm, or 0.35mm.

[0130] In some embodiments, please refer to Figure 20, which is a second schematic diagram of the ferromagnetic thickness in some embodiments of this application. The thickness e of the magnet 311 is greater than or equal to 0.3 mm and less than or equal to 0.35 mm (e is the thickness of the magnet 311 in Figure 20).

[0131] The thickness of magnet 311 is set within the range of greater than or equal to 0.3 mm and less than or equal to 0.35 mm. This can further ensure the thickness of magnet 311, thereby further reducing the probability of defective products, increasing the yield of magnet 311, reducing the iron loss of magnet 311, and ensuring the working efficiency of the motor.

[0132] The thickness range of the 311 magnet can be 0.30mm, 0.31mm, 0.32mm, 0.33mm, 0.34mm, or 0.35mm.

[0133] Although this application has been described herein in conjunction with various embodiments, those skilled in the art, by reviewing the accompanying drawings, the disclosure, and the appended claims, will understand and implement other variations of the disclosed embodiments in carrying out the claimed application. In the claims, the word "comprising" does not exclude other components or steps, and "a" or "an" does not exclude multiple instances. A single processor or other unit can implement several functions listed in the claims. While different dependent claims may recite certain measures, this does not mean that these measures cannot be combined to produce good results.

[0134] Although this application has been described in conjunction with specific features and embodiments, it is obvious that various modifications and combinations can be made thereto without departing from the spirit and scope of this application. Accordingly, this specification and drawings are merely exemplary illustrations of this application as defined by the appended claims, and are considered to cover any and all modifications, variations, combinations, or equivalents within the scope of this application. Clearly, those skilled in the art can make various alterations and modifications to this application without departing from the spirit and scope of this application. Thus, if such modifications and modifications of this application fall within the scope of the claims of this application and their equivalents, this application is also intended to include such modifications and modifications.

[0135] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An electric motor, comprising: A mover (31) and a stator (32), the mover (31) and the stator (32) cooperating to allow the mover (31) to rotate about a first axis; At least one of the mover (31) and the stator (32) is provided with at least one airflow channel (3111), the airflow channel (3111) extending along the first axis direction; The stator (32) and the mover (31) include a plurality of magnets (311) stacked sequentially along the first axis. Each magnet (311) has a first through hole extending along the first axis. The first through holes of the plurality of magnets (311) are connected sequentially to form the airflow channel (3111). The airflow channel (3111) is provided with an oil collection groove (312), which is formed by a radial indentation of the inner wall surface of the airflow channel (3111) and extends circumferentially along the airflow channel (3111). Two adjacent magnets (311) among the plurality of magnets (311) are respectively a first magnet (3112) and a second magnet (3113); the oil collection tank (312) includes a first groove (312a) and a second groove (312b) that are connected to each other, the first groove (312a) is provided on the first magnet (3112), and the second groove (312b) is provided on the second magnet (3113).

2. The motor according to claim 1, wherein the first slot (312a) extends along the first axis to the side surface of the first magnet (3112) facing the second magnet (3113); The second groove (312b) extends along the direction of the first axis to the side surface of the second magnet (3113) facing the first magnet (3112); Along the direction of the first axis, at least a portion of the projection of the first groove (312a) coincides with at least a portion of the projection of the second groove (312b).

3. The motor according to claim 2, wherein the first groove (312a) extends circumferentially around the airflow channel (3111), and the second groove (312b) extends circumferentially around the airflow channel (3111).

4. The motor according to any one of claims 1-3, wherein the surface of the first magnet (3112) facing the second magnet (3113) is a first surface, the first magnet (3112) has a first guide surface (3112a), the first guide surface (3112a) is connected between the inner wall surface of the airflow channel (3111) and the first surface; along the direction of the inner wall surface of the airflow channel (3111) toward the axis of the airflow channel (3111), the distance between the first guide surface (3112a) and the first surface gradually increases; The surface of the second magnet (3113) facing the first magnet (3112) is a second surface. The second magnet (3113) has a second guide surface (3113a), which is connected between the inner wall surface of the airflow channel (3111) and the second surface. Along the direction of the inner wall surface of the airflow channel (3111) toward the axis of the airflow channel (3111), the distance between the second guide surface (3113a) and the second surface gradually increases. The first guide surface (3112a) and the second guide surface (3113a) define the oil pool (312).

5. The motor according to claim 4, wherein the first guide surface (3112a) is one of a first arc surface and a first plane; And / or, the second guide surface (3113a) is one of a second arc surface and a second plane.

6. The motor according to claim 4, wherein the depth of the oil collection groove (312) along the radial direction of the airflow channel (3111) is greater than or equal to 0.05 mm and less than or equal to 0.1 mm.

7. The motor according to claim 4, wherein the height of the first guide surface (3112a) along the direction of the first axis is greater than or equal to 0.03 mm and less than or equal to 0.08 mm; And / or, along the direction of the first axis, the height of the second guide surface (3113a) is greater than or equal to 0.03 mm and less than or equal to 0.08 mm.

8. The motor according to claim 4, wherein the thickness of the magnet (311) along the direction of the first axis is greater than or equal to 0.27 mm and less than or equal to 0.35 mm.

9. The motor according to claim 4, wherein the thickness of the magnet (311) along the direction of the first axis is greater than or equal to 0.3 mm and less than or equal to 0.35 mm.

10. A compressor comprising the motor according to any one of claims 1-9.

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