Motor, compressor and air conditioning equipment

Abstract

The utility model discloses a motor, a compressor and air conditioning equipment, and relates to the technical field of motors, a rotor is provided with a plurality of magnetic steel grooves along the circumferential direction, outer magnetic bridges are disconnected, and the plurality of magnetic steel grooves define a plurality of outer iron cores and an inner iron core located in the middle of the plurality of outer iron cores in the circumferential direction of the rotor; two first slits are arranged on the outer iron core at intervals along the circumferential direction, the circle center angle corresponding to the minimum distance between the two first slits is alpha 1, the circle center angle corresponding to the maximum distance between the two first slits is alpha 2, the number of poles of the motor is P, and the angle of the circle center spanned by each pole of the rotor is 360 / 2 * P; alpha 1 / (360 / 2 * P) is more than or equal to 0.29 and less than or equal to 0.33, and alpha 2 / (360 / 2 * P) is more than or equal to 0.48 and less than or equal to 0.52. The utility model aims to effectively reduce the iron loss of the motor and further improve the efficiency of the motor on the basis of ensuring the structural strength of the rotor.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a motor, compressor and air conditioning equipment. Background Technology

[0002] In the design of permanent magnet synchronous motors (PMSMs) and other types of motors, a design with disconnected external magnetic bridges is sometimes chosen to reduce eddy current losses, optimize magnetic field distribution, and improve heat dissipation. The external magnetic bridge refers to the portion extending from the magnet slot where the permanent magnets are placed to the outer edge of the rotor. Disconnecting these external magnetic bridges effectively cuts off eddy current paths, thereby reducing eddy current losses and facilitating more precise control and optimization of the magnetic field distribution inside the rotor. However, while disconnecting the external magnetic bridges reduces eddy current losses and optimizes the magnetic field distribution, it also alters the magnetic flux path through the air gap, resulting in a less uniform distribution of magnetic flux density in the air gap and increased harmonic content. These additional harmonics not only cause additional losses, vibrations, and noise during motor operation but may also affect the overall performance and efficiency of the motor. Utility Model Content

[0003] The main purpose of this invention is to propose a motor, compressor, and air conditioning equipment that, while ensuring the strength of the rotor structure, effectively reduces the iron loss generated during motor operation and further improves motor efficiency without changing the motor cost.

[0004] To achieve the above objectives, this utility model proposes a motor comprising:

[0005] Stator; and

[0006] The rotor is rotatably mounted on the stator. The rotor has multiple magnetic slots along its circumference. The outer magnetic bridges of the multiple magnetic slots are all disconnected. The multiple magnetic slots define multiple outer iron cores and an inner iron core located in the middle of the multiple outer iron cores in the circumference of the rotor.

[0007] Among them, multiple outer iron cores are connected to the inner iron core through an inner magnetic bridge;

[0008] The outer iron core is provided with two first slits spaced circumferentially. The minimum distance between the two first slits corresponds to the central angle α1, and the maximum distance between the two first slits corresponds to the central angle α2. The number of poles of the motor is P, and the angle spanned by each pole of the rotor is 360 / 2*P. The relationship satisfies: 0.29≤α1 / (360 / 2*P)≤0.33, 0.48≤α2 / (360 / 2*P)≤0.52.

[0009] In one embodiment, the outer periphery of the rotor is provided with a plurality of outwardly opening slots spaced apart along the circumferential direction, and the outer magnetic bridge break of the magnetic slots of two adjacent outer iron cores is connected to the opening slots; the minimum distance between the slot openings in the circumferential direction is W. t The midpoint between the maximum and minimum distances of the two first slits is W. k The motor also includes a magnet installed in the magnet slot, the magnet having a radial length L in the inner iron core. m , of which 1.5*L m ≥W k ≥W t .

[0010] In one embodiment, 6mm≤L m ≤8.5mm.

[0011] In one embodiment, the outer iron core is further provided with two second slits, and the two first slits are located between the two second slits.

[0012] In one embodiment, the minimum distance between adjacent first and second slits is W. x 2*L m ≥W x ≥0.4mm.

[0013] In one embodiment, the minimum distance from the second slit to the outer edge of the outer core is W. d , 0.4mm≤W d ≤2*Lm.

[0014] In one embodiment, the stator has a plurality of notches along its outer edge in the circumferential direction, the maximum outer diameter of the stator is D1, the maximum outer diameter of the rotor is D2, and 0.5≤D2 / D1≤0.68.

[0015] In one embodiment, the first slit is composed of a semicircle and a straight line segment; or the first slit is composed of a semicircle and an arc; or the first slit is composed of a straight line and an arc; or the first slit is composed of an arc or a straight line.

[0016] This utility model also proposes a compressor, including the motor described above.

[0017] This utility model also proposes an air conditioning device, including the motor or compressor described above.

[0018] The technical solution of this utility model connects the outer iron core to the entire inner iron core, forming a relatively independent but interconnected magnetic circuit, thus ensuring the structural strength of the rotor. Addressing the issue of increased air gap magnetic flux density harmonic content caused by the outer magnetic bridge port, the sinusoidal nature of the air gap magnetic flux density is improved by setting the position of the magnetic barrier slits. This improves the distribution of magnetic barrier slits on the traditional rotor iron core, reducing the air gap magnetic flux density harmonic content to lower motor iron losses and further improve motor efficiency. Specifically, two first slits are spaced circumferentially on the outer iron core. The angle between the minimum distance between the two first slits and the center of the circle is α1, and the angle between the maximum distance between the two first slits and the center of the circle is α2. The number of motor poles is P, and the angle spanned by each rotor pole across the center of the circle is 360 / 2*P. The relationships satisfy: 0.29≤α1 / (360 / 2*P)≤0.33, 0.48≤α2 / (360 / 2*P)≤0.52. By adjusting the values ​​of α1 and α2, harmonic components at specific frequencies can be reduced, thereby lowering the overall harmonic distortion rate and improving the electromagnetic performance of the motor. This allows the magnetic field to be more concentrated where needed, avoiding unnecessary magnetic field leakage or cross-interference. Furthermore, the range of parameter selection is relatively clear, facilitating implementation in the actual manufacturing process. Appropriate slit design does not significantly increase manufacturing difficulty while substantially improving motor performance, achieving a good balance between performance and cost. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0020] Figure 1 A schematic diagram of the structure of an embodiment of the motor provided by this utility model;

[0021] Figure 2 for Figure 1 A schematic diagram of the structure of an embodiment of the central rotor;

[0022] Figure 3 A schematic diagram of another embodiment of the motor provided by this utility model;

[0023] Figure 4 for Figure 3 A schematic diagram of another embodiment of the intermediate rotor;

[0024] Figure 5 The graph shows the relationship between the slit central angle α1 and the air gap magnetic flux density THD when P=4.

[0025] Figure 6The graph shows the relationship between the slit central angle α2 and the air gap magnetic flux density (THD) when P = 4.

[0026] Explanation of icon numbers:

[0027] 100, Rotor; 110, Magnet slot; 120, Outer iron core; 121, First slit; 122, Second slit; 130, Inner iron core; 140, Inner magnetic bridge; 150, Open slot;

[0028] 200. Stator;

[0029] 300. Magnet.

[0030] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0032] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0033] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0034] In the design of permanent magnet synchronous motors (PMSMs) and other types of motors, a design with disconnected external magnetic bridges is sometimes chosen to reduce eddy current losses, optimize magnetic field distribution, and improve heat dissipation. The external magnetic bridge refers to the portion extending from the magnet slot where the permanent magnets are placed to the outer edge of the rotor. Disconnecting these external magnetic bridges effectively cuts off eddy current paths, thereby reducing eddy current losses and facilitating more precise control and optimization of the magnetic field distribution inside the rotor. However, while disconnecting the external magnetic bridges reduces eddy current losses and optimizes the magnetic field distribution, it also alters the magnetic flux path through the air gap, resulting in a less uniform distribution of magnetic flux density in the air gap and increased harmonic content. These additional harmonics not only cause additional losses, vibrations, and noise during motor operation but may also affect the overall performance and efficiency of the motor.

[0035] In addition, disconnecting the external magnetic bridge will weaken the rotor's mechanical strength, increase manufacturing complexity, and may affect the effective dissipation of heat.

[0036] This invention proposes a motor that, while ensuring the strength of the rotor structure, effectively reduces iron losses generated during motor operation and further improves motor efficiency without changing the motor cost.

[0037] Please see Figures 1 to 4 In one embodiment of this utility model, the motor includes a stator 200 and a rotor 100. The stator 200 includes a frame, a stator 200 core, and stator 200 windings. The frame is typically made of cast iron or cast steel and its main function is to support and protect the stator 200 core and windings. The stator 200 core is composed of silicon steel sheets and is used to generate a rotating magnetic field. The stator 200 windings are coils that generate a rotating magnetic field when energized, and are typically made of insulated wire and placed in slots in the stator 200 core. The rotor 100 includes a shaft, a rotor 100 core, and a permanent magnet 300. The shaft supports the rotor 100 and transmits torque. The rotor 100 core is also composed of silicon steel sheets and is used to generate electromagnetic induction. The permanent magnet 300 is placed in slots in the rotor 100 core and is typically made of insulated wire; it generates electromagnetic torque when energized.

[0038] Specifically, the rotor 100 is provided with a plurality of magnetic slots 110 along the circumference. The outer magnetic bridges of the plurality of magnetic slots 110 are all disconnected. The plurality of magnetic slots 110 define a plurality of outer iron cores 120 and an inner iron core 130 located in the middle of the plurality of outer iron cores 120 in the circumference of the rotor 100. In order to maintain the overall mechanical strength of the rotor 100, the plurality of outer iron cores 120 are connected to the inner iron cores 130 through inner magnetic bridges 140.

[0039] Reference Figure 2 and Figure 4The rotor 100 structure after the external magnetic bridge is disconnected is designed as multiple sector-shaped outer iron cores 120 and a complete inner iron core 130. Each sector-shaped outer iron core 120 is connected to the entire inner iron core 130, forming a relatively independent but interconnected magnetic circuit. More importantly, slits are provided on each sector-shaped outer iron core 120. The slits can not only further refine the magnetic field distribution, but also effectively disperse and weaken the air gap magnetic flux density harmonics caused by the disconnection of the external magnetic bridge. In this way, the magnetic field harmonic content in the air gap can be significantly reduced without significantly increasing the manufacturing complexity, thereby reducing additional losses, reducing vibration and noise levels, and improving the overall performance and operating stability of the motor.

[0040] Specifically, the outer iron core 120 is provided with two first slits 121 spaced apart along the circumference. The angle between the minimum distance between the two first slits 121 and the center of the circle is α1, and the angle between the maximum distance between the two first slits 121 and the center of the circle is α2. The number of poles of the motor is P, and the angle between the center of the circle spanned by each pole of the rotor 100 is 360 / 2*P. The relationship satisfies: 0.29≤α1 / (360 / 2*P)≤0.33, 0.48≤α2 / (360 / 2*P)≤0.52.

[0041] The outer magnetic bridges of the multiple magnetic slots 110 on the outer circumference of the rotor 100 are all broken, that is, the two adjacent outer iron cores 120 are separated from each other. An internal outer magnetic bridge is arranged between the inner iron core 130 and the outer iron core 120 of the rotor 100, that is, the inner iron core 130 and the outer iron core 120 are connected, but the outer iron cores 120 are not directly connected to each other in order to reduce the leakage magnetic effect of the conduction channel on the iron core, and at the same time to ensure that the structural strength of the rotor 100 meets the requirements.

[0042] The number of outer iron cores 120 is the same as the number of poles of the motor. Each outer iron core 120 is provided with two first slits 121 distributed radially. The permanent magnets 300 are radially arranged in the motor rotor 100. Two first slits 121 are provided on the outer iron core 120 between the two permanent magnets 300. The same polarity is generated by the two adjacent permanent magnets 300, which enhances the magnetic flux gathering effect of the air gap of the motor.

[0043] Reference Figures 1 to 4While ensuring the structural strength of the rotor 100, to address the issue of increased air gap magnetic flux density harmonic content caused by the external magnetic bridge port, the sinusoidal nature of the air gap magnetic flux density is improved by adjusting the position of the magnetic barrier slits. This improves the distribution of magnetic barrier slits on the traditional rotor 100 core, reduces air gap magnetic flux density harmonic content, thereby lowering motor iron losses and further improving motor efficiency. In one embodiment, the central angle at one end of the outer circumference of a pair of slits on the rotor 100d shaft is α1, and the central angle at the end away from the outer circumference is α2. Two first slits 121 are spaced circumferentially on the outer core 120, and the two first slits 121 are distributed in a figure-eight shape; of course, in other embodiments, the two first slits 121 can also be of other shapes.

[0044] Specifically, the angle between the minimum distance between the two first slits 121 and the center of the circle is α1, the angle between the maximum distance between the two first slits 121 and the center of the circle is α2, the number of poles of the motor is P, and the angle spanned by each pole of the rotor 100 is 360 / 2*P; the relationship satisfies: 0.29≤α1 / (360 / 2*P)≤0.33, 0.48≤α2 / (360 / 2*P)≤0.52. The number of poles of the motor determines the angle occupied by each magnetic pole, that is, 360 degrees divided by the number of poles P and then divided by 2 (because each pole corresponds to half a circle) to obtain the angle spanned by each pole.

[0045] The α1 / (360 / 2*P) ratio range defines the angular range of the minimum distance between the two first slits 121. It is a ratio relative to the angle spanned by each pole and affects the uniformity of the magnetic field distribution and the harmonic components.

[0046] The α2 / (360 / 2*P) ratio limits the angular range of the maximum distance between the two first slits 121, which is also a proportion relative to the angle spanned by each pole, further refining the magnetic field path and helping to control the magnetic field distribution more precisely. The optimized setting of the first slits 121 can effectively disperse the magnetic field, making the magnetic flux density distribution in the air gap more uniform.

[0047] Reference Figure 5 , Figure 5 The graph shows the relationship between the slit central angle α1 and the air gap magnetic flux density (THD) when P = 4. The vertical axis represents the air gap magnetic flux density harmonic content, and the horizontal axis represents the ratio of the slit central angle α1 to 45° (when P = 4, the angle spanned by each pole is 45°). As can be seen from the graph, when α1 / (360 / 2*P) is between 0.29 and 0.33, the air gap magnetic flux density harmonic content is close to its minimum value and relatively stable.

[0048] Reference Figure 6 , Figure 6The graph shows the relationship between the central angle α2 of the slit and the THD of the air gap magnetic flux density when P=4. The vertical axis represents the harmonic content of the air gap magnetic flux density, and the horizontal axis represents the ratio of the central angle α2 of the slit to 45° (when P=4, the angle spanned by each pole is 45°). As can be seen from the graph, when α2 / (360 / 2*P) is between 0.48 and 0.52, the harmonic content of the air gap magnetic flux density is close to the minimum value and relatively stable.

[0049] By adjusting the values ​​of α1 and α2, harmonic components at specific frequencies can be reduced, thereby lowering the overall harmonic distortion rate and improving the electromagnetic performance of the motor. This concentrates the magnetic field in the necessary areas, avoiding unnecessary magnetic field leakage or cross-interference. This not only improves motor efficiency but also enhances the smoothness of the output torque. Furthermore, reducing the harmonic content of the air gap magnetic flux density directly leads to a decrease in the vibration and noise levels generated during motor operation. Moreover, the parameter selection range is relatively clear, facilitating implementation in the actual manufacturing process. A well-designed slit design neither significantly increases manufacturing difficulty nor drastically improves motor performance, achieving a good balance between performance and cost.

[0050] For the measurement of α1 and α2, an optical projector (accuracy ±0.1°) is used. The rotor is fixed on a rotating platform, the center position is determined, the coordinates of the circumferential endpoints of the two first slits 121 are measured, the central angle is calculated, and the minimum included angle is taken as α1, and the maximum included angle is taken as α2 (see...). Figure 2 The center positioning error must be less than 0.01mm, otherwise the angle measurement deviation will be significant.

[0051] Furthermore, the rotor 100 has a plurality of outwardly opening slots 150 spaced circumferentially along its outer periphery. The outer magnetic bridge breaks of the magnetic slots 110 of two adjacent outer iron cores 120 are connected to the opening slots 150. The minimum distance between the slot openings 150 in the circumferential direction is Wt, and the intermediate distance between the maximum and minimum distances of the two first slits 121 is Wk. The motor also includes a magnet 300 installed in the magnetic slots 110. The length of the magnet 300 in the radial direction of the inner iron core 130 is Lm, wherein 1.5*Lm≥Wk≥Wt.

[0052] The connection between the slot 150 and the external magnetic bridge break effectively guides the magnetic field path and disperses the magnetic field, thereby reducing the harmonic content of the magnetic field in the air gap. Precise control of the dimensional relationship (Wk and Wt) between the slot 150 and the slits effectively reduces the harmonic content of the magnetic field in the air gap, thus lowering the vibration and noise levels generated during motor operation. Setting the relationship 1.5*Lm≥Wk≥Wt ensures effective control of the magnetic field path. Wk, as the intermediate distance between the maximum and minimum distances of the two first slits 121, directly affects the closed path of the magnetic field; while Wt, as the minimum distance of the slot 150 in the circumferential direction, affects the diffusion and heat dissipation of the magnetic field. A reasonable dimensional ratio ensures magnetic field optimization while also considering mechanical strength and heat dissipation performance.

[0053] Wt is measured by using calipers to measure the width of the narrowest point of the opening along a 150° circumference of the groove. Repeat the measurement at multiple locations and take the minimum value as Wt.

[0054] Wk directly measures the maximum and minimum circumferential distance between the two slits and takes the average value.

[0055] The length Lm is measured by measuring its length along the radial direction of the magnet 300 (from the inner iron core 130 to the outer edge of the rotor) with a vernier caliper, repeating the measurement at multiple locations and taking the average value.

[0056] Specifically, the magnet length should be between 6mm and 8.5mm. Too short a magnet (300mm) may result in insufficient magnetic load, affecting the motor's output capacity; while too long a magnet (300mm) may increase costs and introduce unnecessary mechanical stress or heat dissipation problems. By setting Lm between 6mm and 8.5mm, a suitable magnetic load can be ensured for the motor. An appropriate magnetic load helps improve the motor's electromagnetic conversion efficiency, enabling the motor to achieve the required output power at a lower current, thereby reducing output current and copper losses, and ultimately improving motor efficiency.

[0057] Furthermore, the outer iron core 120 is also provided with two second slits 122, and the two first slits 121 are located between the two second slits 122. The angle between the minimum distance between the first slits 121 and the center of the circle is α1, and the angle between the maximum distance between the first slits 121 and the center of the circle is α2. The minimum distance between the openings of the slots 150 in the circumferential direction is Wt, and the intermediate distance between the maximum distance and the minimum distance between the two first slits 121 is Wk, which satisfies the relationship 1.5*Lm≥Wk≥Wt, where Lm is the radial length of the magnet 300 in the inner iron core 130 (6mm≤Lm≤8.5mm). The specific position and size of the second slits 122 need to be adjusted according to the overall magnetic field optimization requirements. By introducing the second slits 122, the magnetic field path can be further refined, making the magnetic field more concentrated and flowing along the predetermined path. This design helps to more precisely control the magnetic field distribution and reduce inhomogeneities and harmonic components. The presence of the second slit 122 helps to better disperse the magnetic field, preventing excessively high magnetic flux density in certain areas and thus reducing the risk of local magnetic saturation. The combined design of the first slit 121 and the second slit 122 can effectively suppress the harmonic content of the magnetic field in the air gap. The second slit 122 can serve as an additional magnetic field conditioning mechanism to help smooth the magnetic field distribution and reduce unnecessary magnetic field leakage or cross-interference.

[0058] Reference Figure 3 and Figure 4 Specifically, the minimum distance between adjacent first slits 121 and second slits 122 on the same outer iron core 120 is Wx, where 2*Lm ≥ Wx ≥ 0.4mm. On the same outer iron core 120, the minimum distance between adjacent first slits 121 and second slits 122 is set to Wx, with Wx ranging from 0.4mm to twice the length Lm of magnet 300 (6mm ≤ Lm ≤ 8.5mm), i.e., 0.4mm ≤ Wx ≤ 17mm. By precisely setting the minimum distance Wx between the first slits 121 and second slits 122, finer magnetic field path control can be achieved. The minimum distance Wx between the first slits 121 and second slits 122 has a direct impact on the magnetic field distribution. An appropriate Wx value can effectively suppress the magnetic field harmonic content in the air gap, making the magnetic field distribution more uniform and reducing unnecessary magnetic field fluctuations. By setting the relationship 2*Lm≥Wx≥0.4mm, effective control of the magnetic field path and balance of mechanical strength are ensured. For example, when Lm is 6mm, the minimum value of Wx is 0.4mm and the maximum value is 12mm; while when Lm is 8.5mm, the maximum value of Wx can reach 17mm. This flexible dimensional range can be adjusted according to specific application requirements to achieve the best results; it also ensures the mechanical strength of the rotor 100 after machining.

[0059] Furthermore, the minimum distance from the second slit 122 to the outer edge of the outer core 120 on the same outer core 120 is Wd, where 0.4mm ≤ Wd ≤ 2*Lm. By precisely setting the minimum distance Wd from the second slit 122 to the outer edge of the outer core 120, finer magnetic field path control can be achieved, which also facilitates manufacturing. Although more design parameters (such as Wd) are introduced, the selection range of these parameters is relatively clear, making it easy to implement in the actual manufacturing process. Appropriate slit design does not significantly increase manufacturing difficulty while significantly improving motor performance, achieving a good balance between performance and cost. The range of Wd (0.4mm ≤ Wd ≤ 17mm) ensures the flexibility and operability of the design, meeting the needs of high-performance motors without being too demanding to be difficult to manufacture. Setting the relationship of 0.4mm ≤ Wd ≤ 2*Lm ensures a balance between effective control of the magnetic field path and mechanical strength. For example, when Lm is 6mm, the minimum value of Wd is 0.4mm and the maximum value is 12mm; while when Lm is 8.5mm, the maximum value of Wd can reach 17mm. This flexible size range can be adjusted according to specific application requirements to achieve the best results.

[0060] In one specific embodiment, when α1 = 15°, α2 = 25°, W k =7mm, W t =4.4mm, L m =8.5mm, W x When the rotor core thickness is 0.4mm and the rotor core stack thickness is 40mm, the rotor magnetic barrier slit design structure adopted in this utility model reduces the air gap magnetic flux density harmonics by 5.4%, reduces iron loss by 4.8%, and increases efficiency by 0.2% under rated operating conditions while ensuring the rotor structural strength.

[0061] In summary, by setting a second slit 122 on the same outer core 120 and precisely controlling the minimum distance Wd (0.4mm≤Wd≤2*Lm) from the second slit 122 to the outer edge of the outer core 120, the magnetic field distribution can be further optimized, the air gap magnetic flux density harmonic content reduced, and the overall performance of the motor improved. Furthermore, reasonable settings for Wx and Wd ensure design flexibility and operability, meeting the requirements of high-performance motors without being overly demanding to the point of being difficult to manufacture.

[0062] Reference Figure 1 and Figure 3Specifically, the stator 200 has multiple circumferential notches along its outer edge. The maximum outer diameter of the stator 200 is D1, and the maximum outer diameter of the rotor 100 is D2, with a ratio of 0.5 ≤ D2 / D1 ≤ 0.68. The maximum outer diameter D1 of the stator 200 refers to the outermost diameter of the stator 200 core, directly affecting the overall size of the motor and installation space requirements. The maximum outer diameter D2 of the rotor 100 refers to the outermost diameter of the rotor 100 core, determining the mechanical structure and electromagnetic performance of the rotor 100. By precisely controlling the ratio of D2 to D1, the magnetic field distribution in the air gap can be made more uniform, reducing harmonic components and thus improving the electromagnetic conversion efficiency of the motor. A suitable D2 / D1 ratio helps optimize the air gap flux density, reducing losses and increasing output power. By optimizing the ratio of D2 to D1, the overall size of the motor can be minimized while ensuring motor performance, improving space utilization. Setting a ratio range of 0.5 ≤ D2 / D1 ≤ 0.68 ensures the flexibility and adaptability of the motor in different application scenarios. For example, when D1 is large, D2 should also increase accordingly but remain within a reasonable range to maintain optimal electromagnetic performance and mechanical stability; conversely, the same applies. This proportional relationship can be adjusted according to specific needs to achieve the best results.

[0063] The shape of the first slit 121 is not limited. Specifically, the first slit 121 is composed of a semicircle and a straight line segment; or the first slit 121 is composed of a semicircle and an arc; or the first slit 121 is composed of a straight line and an arc; or the first slit 121 is composed of an arc or a straight line.

[0064] Whether it's a semicircle and a straight line segment, a semicircle and an arc, or a combination of a straight line and an arc, a smooth transition path can be provided, helping to guide the magnetic field to flow more concentratedly along the predetermined path and reducing unnecessary magnetic field leakage or cross-interference. By selecting an appropriate geometry, the magnetic field can be better dispersed, preventing excessively high magnetic flux density in certain areas, thereby reducing the risk of local magnetic saturation. Although a variety of possible slit shapes are introduced, the range of these shapes is relatively clear, facilitating implementation in the actual manufacturing process. Appropriate shape design can significantly improve motor performance without significantly increasing manufacturing difficulty, achieving a good balance between performance and cost. By selecting different first slit shapes (such as a semicircle and a straight line segment, a semicircle and an arc, a straight line and an arc, or an arc or a straight line alone), magnetic field path control can be further optimized, air gap magnetic flux density harmonic content can be reduced, and the overall performance of the motor can be improved. This flexibility allows designers to select the most suitable slit shape according to specific application requirements and manufacturing conditions.

[0065] This utility model also proposes a compressor, which includes a motor. The specific structure of the motor is as described in the above embodiments. Since this compressor adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0066] This utility model also proposes an air conditioning device, including the aforementioned motor, wherein the motor shaft is connected to the pump body of the compressor, and the pump body is driven by the motor to perform the compressor's suction and exhaust processes. The motor and compressor can be used in air conditioning systems, such as indoor air conditioning units, central air conditioning systems, and automotive air conditioning systems.

[0067] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. An electric motor, characterized in that, include: stator; and The rotor is rotatably mounted on the stator. The rotor has multiple magnetic slots along its circumference. The outer magnetic bridges of the multiple magnetic slots are all disconnected. The multiple magnetic slots define multiple outer iron cores and an inner iron core located in the middle of the multiple outer iron cores in the circumference of the rotor. Among them, multiple outer iron cores are connected to the inner iron core through an inner magnetic bridge; The outer iron core is provided with two first slits spaced circumferentially. The minimum distance between the two first slits corresponds to the central angle α1, and the maximum distance between the two first slits corresponds to the central angle α2. The number of poles of the motor is P, and the angle spanned by each pole of the rotor is 360 / 2*P. The relationship satisfies: 0.29≤α1 / (360 / 2*P)≤0.33, 0.48≤α2 / (360 / 2*P)≤0.

52.

2. The motor as described in claim 1, characterized in that, The rotor has multiple outward-facing slots spaced circumferentially along its outer periphery. The outer magnetic bridge of the magnetic slots of two adjacent outer iron cores is connected to the slots. The minimum distance between the slot openings in the circumferential direction is W. t The midpoint between the maximum and minimum distances of the two first slits is W. k The motor also includes a magnet installed in the magnet slot, the magnet having a radial length L in the inner iron core. m , of which 1.5*L m ≥W k ≥W t .

3. The motor as described in claim 2, characterized in that, 6mm≤L m ≤8.5mm。 4. The motor as described in claim 1, characterized in that, The outer iron core is also provided with two second slits, and the two first slits are located between the two second slits.

5. The motor as described in claim 4, characterized in that, The minimum distance between adjacent first and second slits is W. x 2*L m ≥W x ≥0.4mm.

6. The motor as described in claim 4, characterized in that, The minimum distance from the second slit to the outer edge of the outer core is W. d , 0.4mm≤W d ≤2*Lm.

7. The motor as described in claim 1, characterized in that, The stator has multiple notches along its outer edge in the circumferential direction. The maximum outer diameter of the stator is D1, and the maximum outer diameter of the rotor is D2, where 0.5 ≤ D2 / D1 ≤ 0.

68.

8. The motor as described in claim 1, characterized in that, The first slit is composed of a semicircle and a straight line segment; or the first slit is composed of a semicircle and an arc; or the first slit is composed of a straight line and an arc; or the first slit is composed of an arc or a straight line.

9. A compressor, characterized in that, Includes the motor as described in any one of claims 1 to 8.

10. An air conditioning device, characterized in that, Includes the motor as described in any one of claims 1 to 8.

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