Stator and compressor motor
By optimizing the size and distance relationship of the stator protrusions, improving the slot fill factor and suppressing harmonics, the problems of armature iron loss and vibration noise in rotary DC inverter compressors were solved, thus improving motor performance.
Patent Information
- Application Number
- CN202520312729.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-25
- Publication Date
- 2026-01-13
- Estimated Expiration
- 2035-02-25
AI Technical Summary
The stator armature reaction of existing rotary DC inverter compressors leads to large armature iron losses in the rotor structure, and the spatiotemporal harmonics of the synthesized magnetic field cause vibration, noise and losses, which existing technologies have failed to effectively reduce.
Design the stator protrusion and optimize its size and distance relationship to improve slot fill factor, suppress spatiotemporal harmonics of the synthetic magnetic field, and reduce motor loss and vibration noise.
By increasing slot fill factor and reducing cogging torque, motor losses and vibration noise are reduced, motor performance is improved, and the electromagnetic sound quality and power density are optimized.
Smart Images
Figure CN223797978U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of compressor technology, specifically relating to a stator and compressor motor. Background Technology
[0002] Currently, rotary DC inverter compressors commonly use built-in permanent magnet motors. For these motors, the stator armature reaction is more pronounced, resulting in significant armature iron losses in the rotor structure. Typically, after the motor is energized, armature iron losses arise from the temporal and spatial harmonics of the combined magnetic field generated by the interaction of the stator and rotor magnetic fields. These harmonics also cause vibration and noise. Existing technologies have not effectively reduced the losses and vibration noise caused by the temporal and spatial harmonics of the combined magnetic field, thus hindering motor performance improvement. Therefore, effectively reducing motor losses and vibration noise has become crucial. Utility Model Content
[0003] To address the shortcomings of the prior art, this invention provides a stator that, by setting an extension and defining the size and distance relationship of the extension, improves the slot fill factor of the stator, reduces cogging torque, effectively suppresses harmonics in the spatiotemporal frequency domain of the synthetic magnetic field, reduces motor losses and vibration noise, and improves motor performance.
[0004] This utility model also provides a compressor motor.
[0005] The technical effects to be achieved by this utility model are realized through the following technical aspects:
[0006] In a first aspect, the present invention provides a stator, including a stator core, wherein a plurality of stator teeth are formed on the inner circumferential surface of the stator core extending away from the outer circumferential surface of the stator core, and the ends of the stator teeth extend along the circumferential direction of the stator core to form protrusions on opposite sides, and the thickness of the protrusions gradually decreases along the extension direction of the protrusions.
[0007] The distance between two adjacent protrusions is D1, the minimum thickness of the protrusion is H1, the maximum thickness of the protrusion is H2, and the stator has the following relationship: 2mm > (D1-H1) > 1.1mm, H2 < 2H1.
[0008] As a further description of the technical solution of this utility model, the stator protrusion includes a first side and a second side located on the axial direction of the stator core. Both the first side and the second side are connected to the protrusion, and the first side and the second side are parallel to each other.
[0009] As a further description of the technical solution of this utility model, the distance between the first side and the second side on the same stator tooth is D2, and the stator has the relationship: D2 > D1.
[0010] As a further description of the technical solution of this utility model, the plurality of stator teeth are arranged at equal intervals along the circumference of the stator core, and adjacent stator teeth are symmetrically distributed.
[0011] As a further description of the technical solution of this utility model, an annular yoke is formed between the inner circumferential surface of the stator core and the outer circumferential surface of the stator core, and one end of the stator protrusion near the outer circumferential surface of the stator core is connected to the annular yoke.
[0012] As a further description of the technical solution of this utility model, the stator also includes a stator winding, and a stator slot is formed between two adjacent stator teeth and the annular yoke. The stator winding is wound on the stator teeth and located in the stator slot.
[0013] Secondly, this utility model provides a compressor motor, including a rotor and a stator, wherein the rotor is disposed inside the stator.
[0014] As a further description of the technical solution of this utility model, the rotor includes a rotor core and a plurality of permanent magnets. The rotor core is provided with a plurality of magnet slots along the circumference, and at least one of the permanent magnets is inserted into each magnet slot.
[0015] As a further description of the technical solution of this utility model, the distance between two adjacent magnet slots is D3, where D3 < 1.3 mm.
[0016] As a further description of the technical solution of this utility model, the outer diameter of the stator core is R1, the outer diameter of the rotor core is R2, and the compressor motor has the relationship: R2 / R1>0.55.
[0017] In summary, this utility model has at least the following advantages:
[0018] The stator provided by this utility model, by setting an extension and defining the size and distance relationship of the extension, not only meets the rigidity requirements of the stator teeth but also reasonably expands the space between two adjacent stator teeth. This improves the slot fill factor of the stator and reduces cogging torque, effectively suppressing harmonics in the spatiotemporal frequency domain of the synthetic magnetic field, thereby reducing motor losses and vibration noise. Simultaneously, by reducing the difference between the maximum and minimum thickness of the extension, the slope of the resulting inclined surface is more gradual, effectively facilitating the magnetic field lines in the air gap magnetic field, reducing leakage flux, increasing power density, and thus improving motor performance.
[0019] The compressor motor provided by this utility model, by setting the stator as described above, can effectively reduce the electromagnetic vibration noise of the compressor motor, which is beneficial to optimizing the electromagnetic sound of the compressor. At the same time, it can reduce motor losses, increase the power density of the compressor motor, and effectively improve the operating performance of the compressor motor. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the cross-sectional structure of the stator in Embodiment 1 of this utility model;
[0021] Figure 2 This is a schematic diagram of the cross-sectional structure of the stator in Embodiment 2 of this utility model;
[0022] Figure 3 This is a schematic diagram of the cross-sectional structure of the compressor motor in Embodiment 3 of this utility model.
[0023] Marked in the image:
[0024] 1. Stator core; 11. Stator tooth; 111. Protrusion; 112. First side surface; 113. Second side surface; 12. Annular yoke; 13. Stator slot;
[0025] 2. Stator windings;
[0026] 100, Rotor; 101, Rotor core; 102, Permanent magnet; 103, Magnet slot; 200, Stator. Detailed Implementation
[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are some, but not all, of the embodiments of this utility model.
[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
[0029] Example 1
[0030] refer to Figure 1 The stator provided in this embodiment includes a stator core 1. Multiple stator teeth 11 are formed on the inner circumferential surface of the stator core 1 extending away from its outer circumferential surface. These stator teeth 11 are used to support the stator windings. In this embodiment, the number of stator teeth 11 is 15.
[0031] The stator teeth 11 have protrusions 111 extending circumferentially from opposite sides of their ends along the stator core 1, with the thickness of the protrusions 111 gradually decreasing along their extension direction. It can be understood that the ends of the stator teeth 11 extend in opposite directions, with the thickness gradually decreasing during the extension process, ultimately forming the protrusions 111. The protrusions 111 on the same stator tooth 11 are mirror-symmetrical, and the protrusions 111 on two adjacent stator teeth 11 are also mirror-symmetrical.
[0032] In cross-section, the protrusion 111 has an approximately trapezoidal shape. The distance between two adjacent protrusions 111 is D1, the minimum thickness of the protrusion 111 is H1, and the maximum thickness of the protrusion 111 is H2. The stator has the following relationship: 2mm > (D1 - H1) > 1.1mm, H2 < 2H1. By reducing the difference between D1 and H1, and reducing the difference between H2 and H1, the rigidity requirements of the stator teeth 11 can be met with the smallest possible dimensions, while also reasonably expanding the slot space formed between two adjacent stator teeth 11.
[0033] Because the inclination of the inclined surface formed on the protrusion 111 tends to be gentle, when the stator winding is wound on the stator teeth 11, it can fill the slot space formed between two adjacent stator teeth 11 to the greatest extent, thereby improving the slot fill factor of the stator. In this embodiment, the slot fill factor is improved by 2.6% compared with the prior art. At the same time, it can effectively guide the magnetic lines of force in the air gap magnetic field, thereby reducing leakage flux, increasing power density, and thus improving motor performance. By optimizing the size of the protrusion 111, the cogging torque of the stator is effectively reduced. In this embodiment, the cogging torque is reduced by 28.6% compared with the prior art. At the same time, it has a certain filtering effect on the harmonics of the synthetic magnetic field, so as to optimize the peak value of the harmonics in the time frequency domain of the electromagnetic force and effectively suppress the harmonics in the time and space frequency domain of the synthetic magnetic field, thereby reducing motor losses and reducing vibration noise.
[0034] In some embodiments, the stator protrusion 11 includes a first side 112 and a second side 113 located axially on the stator core 1. The first side 112 and the second side 113 are disposed opposite to each other. Both the first side 112 and the second side 113 are connected to the protrusion 111, and the first side 112 and the second side 113 are parallel to each other.
[0035] In this embodiment, the distance between the first side surface 112 and the second side surface 113 on the same stator tooth 11 is D2, and the stator has the relationship: D2 > D1. Therefore, the rigidity requirements of the stator tooth 11 can be met, ensuring the basic performance of the stator and effectively utilizing the performance characteristics of the motor.
[0036] The stator in this embodiment, by setting protrusions and optimizing the size and distance relationship of the protrusions, can meet the rigidity requirements of the stator teeth with minimal dimensions, while reasonably expanding the slot space formed between two adjacent stator teeth. When the stator winding is wound on the stator teeth, it can fill the slot space formed between two adjacent stator teeth to the maximum extent, thereby increasing the slot fill factor of the stator by 2.6%. At the same time, it effectively reduces the cogging torque of the stator by 28.6%. It can effectively pass through the magnetic field lines in the air gap magnetic field, thereby reducing leakage flux, increasing power density, and thus improving motor performance. It has a certain filtering effect on the harmonics of the synthetic magnetic field, optimizing the peak value of harmonics in the time frequency domain of electromagnetic force, effectively suppressing the harmonics in the time and space frequency domain of the synthetic magnetic field, thereby reducing motor losses and vibration noise.
[0037] Example 2
[0038] As a further optimization of Example 1, refer to Figure 2 Multiple stator teeth 11 are arranged at equal intervals along the circumference of the stator core 1, and adjacent stator teeth 11 are symmetrically distributed. An annular yoke 12 is formed between the inner and outer circumferential surfaces of the stator core 1, and one end of the stator tooth 11 near the outer circumferential surface of the stator core 1 is connected to the annular yoke 12. It can be understood that the protrusion 111 is formed at the radially inner end of the stator tooth 11, while the radially outer end of the stator tooth 11 is connected to the annular yoke 12.
[0039] In some embodiments, the stator further includes a stator winding 2, with stator slots 13 formed between two adjacent stator teeth 11 and the annular yoke 12. The stator winding 2 is wound on the stator teeth 11 and located within the stator slots 13. Specifically, the stator winding 2 is wound on the stator teeth 11 and located within two adjacent stator slots 13 on both sides of the stator teeth 11. The number of stator slots 13 matches the number of stator teeth 11. In this embodiment, the number of stator slots 13 and the number of stator teeth 11 are the same, both being 15.
[0040] Example 3
[0041] refer to Figure 3 The compressor motor provided in this embodiment includes a rotor 100 and a stator 200 as in Embodiment 1 or 2. The rotor 100 is disposed inside the stator 200. Normally, the rotor 100 and the stator 200 are coaxial, and a rotating shaft passes through the axial position of the rotor 100. Specifically, the rotor 100 includes a rotor core 101 and a plurality of permanent magnets 102. The rotor core 101 is provided with a plurality of magnet slots 103 along the circumference, and at least one permanent magnet 102 is inserted into each magnet slot 103.
[0042] In this embodiment, two permanent magnets 102 are inserted into each magnet slot 103. The permanent magnets 102 can be rare earth materials such as neodymium, iron, boron, magnetite, or iron. Rare earth elements have excellent magnetic properties, which can significantly improve the magnetic field strength of the permanent magnets 102, thereby increasing the motor torque and thus improving the power and efficiency of the motor. At the same time, using rare earth permanent magnets is more conducive to reducing motor losses, thereby further improving motor efficiency.
[0043] In some embodiments, the ratio of stator teeth 11 to magnet slots 103 is 3:2. In this embodiment, there are 15 stator teeth 11 and 10 magnet slots 103. By setting the ratio of stator teeth 11 to magnet slots 103, it is beneficial to reduce the generation of harmonics, reduce cogging torque, reduce vibration noise during motor operation, and improve motor efficiency and output torque.
[0044] In some embodiments, the magnet slot 103 can be V-shaped, thereby further optimizing the magnetic field waveform, reducing cogging torque, reducing motor vibration and noise, and helping to further improve motor performance.
[0045] In this embodiment, the distance between two adjacent magnet slots 103 is D3, where D3 < 1.3 mm. By reducing the distance between two adjacent magnet slots 103, the permanent magnets 102 on the rotor 100 can be more densely distributed, thereby increasing the magnetic flux density on the surface of the rotor 100, reducing magnetic leakage, and thus increasing the output torque of the motor, further improving the performance of the compressor motor.
[0046] In some embodiments, the outer diameter of the stator core 1 is R1, and the outer diameter of the rotor core 101 is R2. The compressor motor has the relationship: R2 / R1 > 0.55. By increasing the ratio between the outer diameter of the rotor core 101 and the outer diameter of the stator core 1, the length of the air gap magnetic circuit can be shortened, thereby enhancing the coupling efficiency between the stator magnetic field and the rotor magnetic field. At the same time, motor losses are reduced, which is beneficial to further improving the operating performance of the compressor motor.
[0047] The compressor motor in this embodiment, by setting the stator as in Embodiment 1 or 2, can effectively reduce the electromagnetic vibration noise of the compressor motor, which is beneficial to optimizing the electromagnetic sound of the compressor. Simultaneously, it can reduce motor losses, increase the power density of the compressor motor, and effectively improve the operating performance of the compressor motor. By reducing the distance between two adjacent magnet slots, the permanent magnets on the rotor are more densely distributed, thereby increasing the magnetic flux density on the rotor surface, reducing magnetic leakage, and thus increasing the output torque of the motor, further improving the performance of the compressor motor. By increasing the ratio between the outer diameter of the rotor core and the outer diameter of the stator core, the length of the air gap magnetic circuit can be shortened, thereby enhancing the coupling efficiency between the stator magnetic field and the rotor magnetic field, while simultaneously reducing motor losses and further improving the operating performance of the compressor motor.
[0048] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0049] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model 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 utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0050] In this invention, unless otherwise expressly specified and limited, "above or below" the first feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on" the first feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the first feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0051] Although the description of this utility model has been given in conjunction with the specific embodiments described above, it is obvious to those skilled in the art that many substitutions, modifications, and variations can be made based on the above description. Therefore, all such substitutions, modifications, and variations are included within the spirit and scope of the appended claims.
Claims
1. A stator, characterized in that, Includes a stator core (1), wherein the inner circumferential surface of the stator core (1) extends in a direction away from the outer circumferential surface of the stator core (1) to form a plurality of stator teeth (11), and the ends of the stator teeth (11) extend in a circumferential direction along the stator core (1) to form protrusions (111) on opposite sides, and the thickness of the protrusions (111) gradually decreases along the extension direction of the protrusions (111); The distance between two adjacent protrusions (111) is D1, the minimum thickness of the protrusion (111) is H1, the maximum thickness of the protrusion (111) is H2, and the stator has the following relationship: 2mm > (D1-H1) > 1.1mm, H2 < 2H1.
2. The stator according to claim 1, characterized in that, The stator protrusion (11) includes a first side (112) and a second side (113) located on the axial direction of the stator core (1). The first side (112) and the second side (113) are both connected to the protrusion (111), and the first side (112) and the second side (113) are parallel to each other.
3. The stator according to claim 2, characterized in that, The distance between the first side surface (112) and the second side surface (113) on the same stator tooth (11) is D2, and the stator has the relationship: D2 > D1.
4. The stator according to claim 1, characterized in that, The stator teeth (11) are arranged at equal intervals along the circumference of the stator core (1), and adjacent stator teeth (11) are symmetrically distributed.
5. The stator according to claim 1, characterized in that, An annular yoke (12) is formed between the inner circumferential surface of the stator core (1) and the outer circumferential surface of the stator core (1), and one end of the stator tooth (11) near the outer circumferential surface of the stator core (1) is connected to the annular yoke (12).
6. The stator according to claim 5, characterized in that, It also includes a stator winding (2), with a stator slot (13) formed between two adjacent stator teeth (11) and the annular yoke (12), and the stator winding (2) is wound on the stator teeth (11) and located in the stator slot (13).
7. A compressor motor, characterized in that, It includes a rotor (100) and a stator (200) as described in any one of claims 1-6, wherein the rotor (100) is disposed inside the stator (200).
8. The compressor motor according to claim 7, characterized in that, The rotor (100) includes a rotor core (101) and a plurality of permanent magnets (102). The rotor core (101) is provided with a plurality of magnet slots (103) along the circumferential direction, and at least one of the permanent magnets (102) is inserted in each magnet slot (103).
9. The compressor motor according to claim 8, characterized in that, The distance between two adjacent magnet slots (103) is D3, where D3 < 1.3 mm.
10. The compressor motor according to claim 8, characterized in that, The outer diameter of the stator core (1) is R1, the outer diameter of the rotor core (101) is R2, and the compressor motor has the following relationship: R2 / R1 > 0.55.