Permanent magnet motor, compressor and refrigeration equipment

Abstract

The utility model relates to the technical field of motors, and discloses a permanent magnet motor, a compressor and refrigeration equipment. The motor rotor comprises a rotor iron core, a plurality of magnet slots arranged at intervals along the circumferential direction of the rotor iron core, permanent magnets arranged in the magnet slots to form magnetic poles, and magnetic isolation holes corresponding to the magnet slots and arranged between the magnet slots and the outer edge of the rotor iron core. Assuming that the number of pairs of magnetic poles is P, and the distance between the intersection point of the two side edges, far away from the center of the rotor core, of each magnet slot and the center of the rotor core is Pa, P and Pa meet the following conditions: 6.15 lt; pa * sin (180 degrees / P) lt; 8.8). The permanent magnet motor provided by the utility model can reduce radial electromagnetic force waves generated by the interaction of armature magnetic field harmonic waves and rotor magnetic field harmonic waves, thereby improving the vibration noise of a key frequency band of the permanent magnet motor, and effectively improving the hearing feeling of the permanent magnet motor.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, specifically to a permanent magnet motor, a compressor, and a refrigeration device. Background Technology

[0002] In current air conditioning technology, the motors used in air conditioning compressors are rotary DC inverter compressors, and the motors generally adopt built-in permanent magnet motors. In recent years, with the increase in motor power density, higher requirements have been put forward for motor vibration and noise. In addition to the requirements for the noise level itself, there is also a higher subjective requirement for the actual listening experience of the noise. However, the motors of the past are increasingly unable to meet such quiet requirements.

[0003] Therefore, researching a technology that can effectively improve the perceived noise level of permanent magnet motors and reduce their noise levels is of decisive significance for improving the perceived noise level of air conditioner compressors and air conditioners, and reducing their noise levels. Utility Model Content

[0004] To address the shortcomings of the prior art, this utility model provides a permanent magnet motor, which mainly improves the layout and structural design of the magnet slots inside the motor rotor to suppress armature magnetic field harmonics, reduce the radial electromagnetic force waves generated by the interaction between armature magnetic field harmonics and rotor magnetic field harmonics, thereby improving the vibration and noise of the permanent magnet motor in the key frequency band and effectively improving the listening experience of the permanent magnet motor.

[0005] This invention also provides a compressor and refrigeration equipment using the aforementioned permanent magnet motor, which can effectively improve the vibration noise in the key frequency band of the equipment, thereby effectively improving the listening experience of the equipment.

[0006] The technical effects to be achieved by this utility model are realized through the following technical aspects:

[0007] In a first aspect, this utility model provides a permanent magnet motor, comprising a motor rotor, a motor stator surrounding the outer periphery of the motor rotor, and an air gap disposed between the motor rotor and the motor stator; wherein,

[0008] The motor rotor includes a rotor core, a plurality of magnet slots arranged at intervals along the circumferential direction of the rotor core, permanent magnets disposed in the magnet slots to form magnetic poles, and magnetic isolation holes corresponding to each magnet slot and disposed between the magnet slot and the outer edge of the rotor core.

[0009] Assuming the number of pole pairs is P, and the distance between the intersection of the two sides of the magnet slot furthest from the center of the rotor core and the center of the rotor core is Pa, then P and Pa satisfy:

[0010] 6.15 <Pa×sin(180° / P)<8.8。

[0011] As one preferred embodiment, assuming the distance between the intersection of the two sides of the magnet slot away from the center of the rotor core and the intersection of the two sides of the magnet slot near the center of the rotor core is Kt, then Kt satisfies: 1.57 mm <Kt<1.79㎜。

[0012] As one preferred embodiment, assuming the distance between the ends of the two permanent magnets within the same magnet slot adjacent to the outer edge of the rotor core is Vc, and the maximum distance between the two ends of the magnet slot is Ws, then Vc and Ws satisfy: 0.65 <Vc / Ws<0.85。

[0013] As one preferred embodiment, assuming the distance between the intersection points of the two sides of two adjacent magnet slots furthest from the center of the rotor core is Tb, then Tb satisfies: 8 mm <Tb<18㎜。

[0014] As one preferred embodiment, the magnet slot is a V-shaped magnet slot structure, including a first side slot and a second side slot arranged symmetrically, and magnetic barrier slots arranged symmetrically at the ends of the first side slot and the second side slot.

[0015] As one preferred embodiment, the number of magnet slots is 6-12; and the number of magnetic isolation holes corresponding to each magnet slot is 2 or 4.

[0016] As one preferred embodiment, the magnetic isolation holes are symmetrically arranged on both sides of the center line of the magnet slot, forming an elongated hole structure.

[0017] As one preferred embodiment, the motor rotor further includes a plurality of internal holes and a plurality of refrigerant channels evenly spaced in the circumferential direction of the rotor core.

[0018] Secondly, this utility model provides a compressor, including a compressor body and a permanent magnet motor disposed within the compressor body as described above.

[0019] Thirdly, this utility model provides a refrigeration device, including a refrigeration device body and a compressor disposed within the refrigeration device body as described above.

[0020] In summary, this utility model has at least the following advantages:

[0021] 1. The permanent magnet motor provided by this utility model mainly suppresses the harmonics of the armature magnetic field by improving the layout and structural design of the magnet slots inside the motor rotor, reducing the radial electromagnetic force waves generated by the interaction between the armature magnetic field harmonics and the rotor magnetic field harmonics, thereby improving the vibration noise in the key frequency band of the permanent magnet motor and effectively improving the listening experience of the permanent magnet motor.

[0022] 2. The compressor provided by this utility model is assembled using the aforementioned permanent magnet motor, which can effectively improve the vibration noise in the key frequency band of the compressor, thereby effectively improving the listening experience of the compressor.

[0023] 3. The refrigeration equipment provided by this utility model is assembled using the above-mentioned compressor, which can also effectively improve the vibration and noise of the key frequency band of the refrigeration equipment, thereby effectively improving the listening experience of the refrigeration equipment. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the permanent magnet motor in this embodiment of the present invention.

[0025] Figure 2 This is a schematic diagram of the motor rotor in an embodiment of the present invention.

[0026] Figure 3 for Figure 2 An enlarged schematic diagram of part A in the middle.

[0027] Figure label:

[0028] 10. Motor rotor; 11. Rotor core; 12. Magnet slot; 121. First side slot; 122. Second side slot; 123. Magnetic barrier slot; 13. Permanent magnet; 14. Magnetic isolation hole; 15. Internal hole; 16. Refrigerant channel;

[0029] 20. Motor stator;

[0030] 30. Air gap. Detailed Implementation

[0031] 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.

[0032] 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.

[0033] Example 1:

[0034] Please see the appendix Figure 1 The permanent magnet motor of this embodiment includes a motor rotor 10, a motor stator 20 surrounding the motor rotor 10, and an air gap 30 disposed between the motor rotor 10 and the motor stator 20. The motor rotor 10 is the core rotating component of the permanent magnet motor, used to convert electrical energy into mechanical energy under the action of an electromagnetic field. The motor stator 20 is mainly used to generate a rotating magnetic field, realizing the energy conversion of the permanent magnet motor and providing driving force for the motor rotor 10, causing the motor rotor 10 to rotate under the action of electromagnetic force in the magnetic field. The air gap 30 is the necessary path for the magnetic field of the permanent magnet motor, and together with the motor stator 20 and the motor rotor 10, it constitutes the magnetic circuit of the permanent magnet motor. The magnetic field passes through the air gap 30, transmitting the magnetic field generated by the motor stator 20 to the motor rotor 10, causing the motor rotor 10 to rotate under the action of electromagnetic force, thus realizing the energy conversion of the permanent magnet motor. The appropriate size of the air gap 30 has a significant impact on the distribution and performance of the magnetic field of the permanent magnet motor.

[0035] Please refer to the appendix for further details. Figure 2 The motor rotor 10 includes a rotor core 11, a plurality of magnet slots 12 spaced apart along the circumferential direction of the rotor core 11, permanent magnets 13 disposed within the magnet slots 12 to form magnetic poles, and magnetic isolation holes 14 corresponding to each magnet slot 12 and disposed between the magnet slot 12 and the outer edge of the rotor core 11. The rotor core 11 is the core component of the motor rotor 10 and plays a crucial role in the energy conversion process of the permanent magnet motor; it is typically composed of multiple stacked core laminations. The magnet slots 12 are mainly used for the installation and positioning of the permanent magnets 13. The permanent magnets 13 are mainly used to generate a magnetic field, improve the power factor, and enhance the performance of the permanent magnet motor. The magnetic isolation holes 14 are mainly used to optimize the distribution of the magnetic field, reduce magnetic leakage, reduce losses, and thus improve the performance of the permanent magnet motor.

[0036] Furthermore, magnet slot 12 is a V-shaped magnet slot structure; please refer to the appendix for further details. Figure 3 Its specific structure includes symmetrically arranged first side grooves 121 and second side grooves 122, and magnetic barrier grooves 123 symmetrically arranged at the ends of the first side grooves 121 and second side grooves 122. Magnetic isolation holes 14 are symmetrically arranged on both sides of the center line of the magnet slot 12, preferably with an elongated hole structure. More preferably, the number of magnet slots 12 is 6-12, and the number of magnetic isolation holes 14 correspondingly arranged in each magnet slot 12 is 2 or 4.

[0037] Furthermore, assuming the number of pole pairs is P, and the distance between the intersection of the two sides of the magnet slot 12 furthest from the center of the rotor core 11 and the center of the rotor core 11 is Pa, then P and Pa satisfy:

[0038] 6.15 < Pa × sin(180° / P) < 8.8;

[0039] That is, the number of pairs of permanent magnets is P, and the distance between the center of the rotor core 11 and the side of the V-shaped magnet slot 12 away from the center of the rotor core 11 satisfies: 6.15 < Pa × sin(180° / P) < 8.8.

[0040] Preferably, assuming that the distance between the intersection points of the two sides of the magnet slot 12 away from the center of the rotor core 11 and the intersection points of the two sides of the magnet slot 12 adjacent to the center of the rotor core 11 is Kt, then Kt satisfies: 1.57 mm < Kt < 1.79 mm; that is, the distance Kt between the intersection points of the inner and outer sides at the center line of the V-shaped magnet slot 12 is 1.57 mm - 1.79 mm.

[0041] In the permanent magnet motor of this embodiment, by improving the layout design and structural design of the magnet slots 12 in the motor rotor 10, the harmonics of the armature magnetic field are suppressed, the radial electromagnetic force wave generated by the interaction between the harmonics of the armature magnetic field and the harmonics of the rotor magnetic field is reduced, and thus the vibration and noise in the key frequency bands of the permanent magnet motor are improved, effectively improving the auditory perception of the permanent magnet motor.

[0042] Embodiment 2:

[0043] Please refer to the attached Figure 1-3 , the permanent magnet motor of the embodiment of the present utility model is the same as that of Embodiment 1, and both include a motor rotor 10, a motor stator 20 surrounding the outer periphery of the motor rotor 10, and an air gap 30 provided between the motor rotor 10 and the motor stator 20. Among them, the motor rotor 10 includes a rotor core 11, a plurality of magnet slots 12 arranged at intervals along the circumferential direction of the rotor core 11, permanent magnets 13 arranged in the magnet slots 12 to form magnetic poles, and magnetic isolation holes 14 corresponding to each magnet slot 12 and arranged between the magnet slot 12 and the outer edge of the rotor core 11. The main difference is that, based on Embodiment 1, this embodiment further designs the layout and structure of the magnet slots 12, and the specific design is as follows:

[0044] Please refer to the attached Figure 3 , assuming that the distance between the ends of the two permanent magnets 13 adjacent to the outer edge of the rotor core 11 on one side in the same magnet slot 12 is Vc, and the maximum distance between the two ends of the magnet slot 12 is Ws, then Vc and Ws satisfy: 0.65 < Vc / Ws < 0.85. Further, assuming that the distance between the intersection points of the two sides of the two adjacent magnet slots 12 away from the center of the rotor core 11 is Tb, then Tb satisfies: 8 mm < Tb < 18 mm; that is, the distance Tb between the intersection points of the two sides of the two adjacent magnet slots 12 at the center line and away from the center of the rotor core 11 is 8 mm - 18 mm.

[0045] The permanent magnet motor in this embodiment further optimizes the layout and structural design of the magnet slot 12 based on embodiment 1. This can further and effectively reduce the radial electromagnetic force waves generated by the interaction between armature magnetic field harmonics and rotor magnetic field harmonics, thereby improving the vibration noise in the key frequency band of the permanent magnet motor and effectively improving the listening experience of the permanent magnet motor.

[0046] Example 3:

[0047] Please see the appendix Figure 1-3 The permanent magnet motor of this embodiment is the same as that of Embodiment 1 or 2, including a motor rotor 10, a motor stator 20 surrounding the outer periphery of the motor rotor 10, and an air gap 30 disposed between the motor rotor 10 and the motor stator 20. The motor rotor 10 includes a rotor core 11, a plurality of magnet slots 12 spaced apart along the circumferential direction of the rotor core 11, permanent magnets 13 disposed within the magnet slots 12 to form magnetic poles, and magnetic isolation holes 14 corresponding to each magnet slot 12 and disposed between the magnet slot 12 and the outer edge of the rotor core 11. The main difference is that this embodiment further designs the rotor core 11 based on Embodiment 1 or 2, as detailed below:

[0048] Please see the appendix Figure 2 and 3 The motor rotor 10 also includes a plurality of internal holes 15 and a plurality of refrigerant channels 16 evenly spaced in the circumferential direction of the rotor core 11; the combination of internal holes 15 and refrigerant channels 16 can not only effectively increase the heat dissipation area of ​​the permanent magnet motor and improve the heat dissipation performance of the permanent magnet motor, but also maintain the dynamic balance of the permanent magnet motor and effectively reduce the vibration and noise of the permanent magnet motor during operation.

[0049] The permanent magnet motor in this embodiment further optimizes the design of the rotor core 11 based on embodiment 1 or 2. This not only effectively improves the vibration and noise of the permanent magnet motor in the key frequency band and improves the listening experience of the permanent magnet motor, but also effectively improves the heat dissipation performance of the permanent magnet motor.

[0050] Example 4:

[0051] The compressor of this embodiment includes a compressor body and a permanent magnet motor disposed within the compressor body, as described in any of embodiments 1-3. The compressor in this embodiment, assembled using the permanent magnet motors of embodiments 1-3, can effectively improve the vibration noise in the critical frequency band of the compressor, thereby effectively improving the listening experience of the compressor.

[0052] Example 5:

[0053] The refrigeration device of this embodiment includes a refrigeration device body and a compressor, as described in Embodiment 4, disposed within the refrigeration device body. The refrigeration device in this embodiment, such as an air conditioner, is assembled using the compressor in Embodiment 4, and can also effectively improve the vibration noise in the key frequency bands of the refrigeration device, thereby effectively improving the listening experience of the refrigeration device.

[0054] As can be seen from the technical solutions of the above embodiments, this utility model provides a permanent magnet motor, which mainly suppresses the harmonics of the armature magnetic field and reduces the radial electromagnetic force waves generated by the interaction between the armature magnetic field harmonics and the rotor magnetic field harmonics by improving the layout and structural design of the magnet slots inside the motor rotor. This improves the vibration and noise in the key frequency band of the permanent magnet motor and effectively improves the listening experience. This utility model also provides a compressor and refrigeration equipment using the above-mentioned permanent magnet motor, which can also effectively improve the vibration and noise in the key frequency band of the equipment and thus effectively improve the listening experience.

[0055] 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.

[0056] 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.

[0057] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0058] 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.

[0059] 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 permanent magnet motor, characterized in that, It includes a motor rotor (10), a motor stator (20) surrounding the outer periphery of the motor rotor (10), and an air gap (30) disposed between the motor rotor (10) and the motor stator (20); wherein, The motor rotor (10) includes a rotor core (11), a plurality of magnet slots (12) arranged at intervals along the circumferential direction of the rotor core (11), a permanent magnet (13) disposed in the magnet slots (12) to form a magnetic pole, and a magnetic isolation hole (14) corresponding to each magnet slot (12) and disposed between the magnet slot (12) and the outer edge of the rotor core (11); Assuming the number of pole pairs is P, and the distance between the intersection of the two sides of the magnet slot (12) away from the center of the rotor core (11) and the center of the rotor core (11) is Pa, then P and Pa satisfy: 6.15 <Pa×sin(180° / P)<8.8。 2. The permanent magnet motor according to claim 1, characterized in that, Assuming the distance between the intersection of the two sides of the magnet slot (12) away from the center of the rotor core (11) and the intersection of the two sides of the magnet slot (12) near the center of the rotor core (11) is Kt, then Kt satisfies: 1.57 mm <Kt<1.79㎜。 3. The permanent magnet motor according to claim 1, characterized in that, Assuming the distance between the ends of the two permanent magnets (13) in the same magnet slot (12) near the outer edge of the rotor core (11) is Vc, and the maximum distance between the two ends of the magnet slot (12) is Ws, then Vc and Ws satisfy: 0.65 <Vc / Ws<0.85。 4. The permanent magnet motor according to claim 1, characterized in that, Assuming the distance between the intersection points of the two sides of two adjacent magnet slots (12) away from the center of the rotor core (11) is Tb, then Tb satisfies: 8 mm <Tb<18㎜。 5. The permanent magnet motor according to claim 1, characterized in that, The magnet slot (12) is a V-shaped magnet slot structure; it includes a first side slot (121) and a second side slot (122) symmetrically arranged, and magnetic barrier slots (123) symmetrically arranged at the ends of the first side slot (121) and the second side slot (122).

6. The permanent magnet motor according to claim 1, characterized in that, The number of magnet slots (12) is 6-12; the number of magnetic isolation holes (14) corresponding to each magnet slot (12) is 2 or 4.

7. The permanent magnet motor according to claim 1, characterized in that, The magnetic isolation holes (14) are symmetrically arranged on both sides of the center line of the magnet slot (12), and have an elongated hole structure.

8. The permanent magnet motor according to claim 1, characterized in that, The motor rotor (10) also includes a plurality of internal holes (15) and a plurality of refrigerant channels (16) evenly spaced in the circumferential direction of the rotor core (11).

9. A compressor, characterized in that, It includes a compressor body and a permanent magnet motor as described in any one of claims 1-8, disposed within the compressor body.

10. A refrigeration device, characterized in that, It includes a refrigeration equipment body and a compressor as described in claim 9, disposed within the refrigeration equipment body.

Images