Motor, compressor and air conditioning equipment

Abstract

The utility model discloses a motor, compressor and air conditioning equipment, and relates to the technical field of motors, the motor comprises a stator and a rotor, the stator comprises a yoke part and a plurality of tooth parts extending inwards from the yoke part, the stator is provided with a first stator section and a second stator section in the axial direction, and the second stator section is arranged at the axial end part of the stator; the tooth width of the tooth part of the first stator section in the circumferential direction is larger than the tooth width of the corresponding position of the second stator section, and a stepped structure is formed in the axial direction; the rotor is rotatably arranged on the stator; the gap between the first stator segment and the rotor is larger than the gap between the second stator segment and the rotor. According to the technical scheme provided by the utility model, the distance between the area with small tooth width and the rotor is increased, and the magnetic resistance of the magnetic circuit in the area is increased, so that the magnetic saturation phenomenon of the motor is reduced, the harmonic wave of air gap flux density is reduced, the iron loss is reduced, and the energy efficiency of the motor is improved.

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 field of motor design, improving energy efficiency is a perpetual pursuit. As a core component, the stator's structure has a decisive impact on the overall performance of the motor. Traditional motor stators typically consist of windings, an insulating frame, and a stator core. However, larger winding end dimensions often lead to reduced motor efficiency because these larger ends increase resistance losses and limit the effective utilization of magnetic flux. To address this issue, existing technology proposes an improvement: setting a stepped structure on the stator core and matching it with the insulating frame to reduce the height of the winding ends. While this method can reduce the negative impact of the winding ends to some extent, the presence of the stepped structure in the stator width direction inevitably leads to some teeth being too narrow, resulting in increased saturation of these teeth. This not only causes magnetic flux attenuation but also increases iron losses during motor rotation, ultimately affecting the motor's efficiency and reliability. Utility Model Content

[0003] The main purpose of this invention is to propose a motor, compressor, and air conditioning device that optimizes the magnetic field distribution by adjusting the tooth width of the first and second stator sections and the gap between them and the rotor. This not only effectively reduces the height of the winding ends to improve motor energy efficiency, but also avoids the problem of aggravated magnetic saturation of some teeth due to unreasonable stator structure design.

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

[0005] A stator includes a yoke and a plurality of teeth extending inwardly from the yoke. The stator has a first stator segment and a second stator segment in the axial direction. The first stator segment is located at the axial end of the stator. The teeth of the first stator segment have a circumferential tooth width greater than the corresponding tooth width of the second stator segment, forming a stepped structure in the axial direction.

[0006] The rotor is rotatably disposed on the stator; wherein the gap between the first stator section and the rotor is greater than the gap between the second stator section and the rotor.

[0007] In one embodiment, the outer diameter of the rotor is D. r The inner diameter of the first stator segment is D. s1 The inner diameter of the second stator segment is D. s2 , where D s1 -D r >Ds2 -D r .

[0008] In one implementation, 0 < (D s1 -D r )-(D s2 -D r <0.8mm.

[0009] In one embodiment, the inner diameter of the stator is D. s The rotor has an outer diameter of D. r1 The first rotor section and its outer diameter are D r2 The second rotor segment, where the first rotor segment corresponds to the first stator segment, and the second rotor segment corresponds to the second stator segment, wherein D s -D r1 >D s -D r2 .

[0010] In one implementation, 0 < (D s -D r1 )-(D s -D r2 <0.8mm.

[0011] In one embodiment, the total axial height of the first stator segment is H1, and the total axial height of the second stator segment is H2, satisfying the relationship: 3.5% ≤ H2 / (H1+H2) ≤ 20%.

[0012] In one embodiment, the second stator segment has different tooth widths in the circumferential direction and has at least one step.

[0013] In one embodiment, the second stator segment comprises two segments, and the first stator segment is disposed between the two second stator segments.

[0014] In one embodiment, the tooth width of the first stator segment is W, and the minimum tooth width of the second stator segment is w. m Ww m ≥0.6mm.

[0015] This utility model also proposes a compressor, including the motor described above.

[0016] This utility model also proposes an air conditioning device, including the motor described above.

[0017] The technical solution of this utility model adopts a stepped structure by using a first stator segment with a tooth width greater than that of the second stator segment, and a gap between the first stator segment and the rotor greater than that between the second stator segment and the rotor. Compared with the stepped iron core design in the prior art, this design not only effectively reduces magnetic saturation but also optimizes the magnetic field distribution. Specifically, increasing the width of the teeth in the first stator segment helps to distribute the magnetic field more evenly, especially in high magnetic field density areas, thereby avoiding magnetic saturation caused by localized magnetic flux concentration and improving the overall efficiency and reliability of the motor. In addition, increasing the air gap between the first stator segment and the rotor can reduce unnecessary magnetic flux leakage and lower the magnetic flux density in this area, thereby significantly reducing iron loss. Attached Figure Description

[0018] 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.

[0019] Figure 1 A schematic diagram of the structure of an embodiment of the motor provided by this utility model;

[0020] Figure 2 A schematic diagram of another embodiment of the motor provided by this utility model;

[0021] Figure 3 This is a schematic diagram of the structure of one embodiment of the stator;

[0022] Figure 4 A schematic diagram of the stator structure from another perspective;

[0023] Figure 5 A schematic diagram of another embodiment of the stator;

[0024] Figure 6 This is a schematic diagram of the structure of one embodiment of the rotor;

[0025] Figure 7 The graph shows the relationship between motor efficiency and 0 < (Ds-Dr1)(Ds-Dr2) < 0.8 mm.

[0026] Explanation of icon numbers:

[0027] 100, Stator; 101, First stator section; 102, Second stator section; 110, Yoke; 120, Tooth section; 200, Rotor.

[0028] 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

[0029] 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.

[0030] 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.

[0031] 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.

[0032] In the field of motor design, improving energy efficiency is a perpetual pursuit. As a core component, the stator's structure has a decisive impact on the overall performance of the motor. Traditional motor stators typically consist of windings, an insulating frame, and a stator core. However, larger winding end dimensions often lead to reduced motor efficiency because these larger ends increase resistance losses and limit the effective utilization of magnetic flux. To address this issue, existing technology proposes an improvement: setting a stepped structure on the stator core and matching it with the insulating frame to reduce the height of the winding ends. While this method can reduce the negative impact of the winding ends to some extent, the presence of the stepped structure in the stator width direction inevitably leads to some teeth being too narrow, resulting in increased saturation of these teeth. This not only causes magnetic flux attenuation but also increases iron losses during motor rotation, ultimately affecting the motor's efficiency and reliability.

[0033] This invention proposes a motor that aims to optimize the magnetic field distribution by adjusting the tooth width of the first and second stator sections and the gap between them and the rotor. This not only effectively reduces the height of the winding ends to improve motor energy efficiency, but also avoids the problem of aggravated magnetic saturation of some teeth due to unreasonable stator structure design.

[0034] Please see Figures 1 to 6 In one embodiment of this utility model, the motor includes a stator 100 and a rotor 200. The stator 100 includes a frame, a stator core, and stator windings. The frame is typically made of cast iron or cast steel and its main function is to support and protect the stator core and windings. The stator core is composed of silicon steel sheets and is used to generate a rotating magnetic field. The stator 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 core. The rotor 200 includes a shaft, a rotor core, and permanent magnets. The shaft supports the rotor 200 and transmits torque. The rotor core is also composed of silicon steel sheets and is used to generate electromagnetic induction. The permanent magnets are placed in slots in the rotor core and are typically made of insulated wire; they generate electromagnetic torque when energized.

[0035] To facilitate installation with the insulating frame and reduce the end height, the stator 100 includes an annular yoke 110 and a plurality of teeth 120 extending inward from the yoke 110. The stator has a first stator segment 101 and a second stator segment 102 in the axial direction. The tooth width of the first stator segment 101 in the circumferential direction is greater than the tooth width at the corresponding position of the second stator segment 102, forming a stepped structure in the axial direction. The rotor 200 is rotatably mounted on the stator. To reduce the magnetic saturation phenomenon of the motor, the gap between the first stator segment 101 and the rotor 200 is greater than the gap between the second stator segment 102 and the rotor 200.

[0036] Reference Figures 1 to 3 The second stator segment 102 is located at the end of the stator axial direction. The tooth width 120 of the first stator segment 101 is greater than the width of the second stator segment 102. The wider tooth width 120 can carry more magnetic flux, avoiding magnetic saturation caused by localized magnetic flux concentration. Adjusting the difference in tooth width 120 between different stator segments helps to form a more uniform magnetic field distribution throughout the motor, which helps to improve the overall efficiency and power output of the motor. Traditional solutions mainly reduce the height of the winding ends by setting steps on the iron core and using an insulating frame to improve motor efficiency. However, this method may result in some tooth widths being too small, thereby increasing magnetic saturation in these areas. In contrast, the design where "the tooth width 120 of the first stator segment 101 is greater than the width of the second stator segment 102" aims to optimize the magnetic field distribution by adjusting the tooth width 120, especially to improve the magnetic saturation problem. The wider tooth width 120 can carry more magnetic flux, avoiding magnetic saturation caused by localized magnetic flux concentration.

[0037] Setting the gap between the first stator section 101 and the rotor 200 to be larger than that between the second stator section 102 can further optimize the magnetic field distribution, reduce magnetic flux leakage, and effectively reduce iron losses. The larger air gap reduces the intensity of direct magnetic field interaction, thereby reducing the risk of magnetic saturation and improving the stability and efficiency of the motor during operation.

[0038] The technical solution of this utility model adopts a design where the width of the teeth 120 of the first stator segment 101 is greater than the width of the second stator segment 102, and the gap between the first stator segment 101 and the rotor 200 is greater than the gap between the second stator segment 102 and the rotor 200. Compared with the stepped iron core design in the prior art, this design not only effectively reduces magnetic saturation but also optimizes the magnetic field distribution. Specifically, increasing the width of the teeth 120 of the first stator segment 101 helps to distribute the magnetic field more evenly, especially in high magnetic field density areas, thereby avoiding magnetic saturation caused by localized magnetic flux concentration and improving the overall efficiency and reliability of the motor. In addition, increasing the air gap between the first stator segment 101 and the rotor 200 can reduce unnecessary magnetic flux leakage and lower the magnetic flux density in this area, thereby significantly reducing iron loss.

[0039] In one embodiment, the gap between the first stator section 101 and the rotor 200 is greater than the gap between the second stator section 102 and the rotor 200, which can be achieved by adjusting the outer diameter of the rotor 200.

[0040] Reference Figure 2Specifically, the inner diameter of the stator 100 is Ds, and the rotor 200 has a first rotor 200 segment with an outer diameter of Dr1 and a second rotor 200 segment with an outer diameter of Dr2. The first rotor 200 segment corresponds to the first stator segment 101, and the second rotor 200 segment corresponds to the second stator segment 102, wherein Ds-Dr1 > Ds-Dr2.

[0041] The outer diameter of rotor 200 is reduced: while keeping the inner diameter of the first stator section 101 unchanged, the outer diameter of the portion of rotor 200 corresponding to the first stator section 101 is reduced. This directly increases the air gap between the first stator section 101 and rotor 200 without changing the design of stator 100.

[0042] Segmented rotor 200: The rotor 200 can be designed as a segmented structure with different diameters, so that the part corresponding to the first stator segment 101 has a smaller outer diameter, thereby forming a larger air gap.

[0043] Specifically, 0 < (Ds-Dr1) - (Ds-Dr2) < 0.8 mm.

[0044] Reference Figure 7 , Figure 7 The graph shows the relationship between motor efficiency and 0 < (Ds-Dr1)(Ds-Dr2) < 0.8 mm. The vertical axis represents the motor efficiency value increasing from bottom to top, and the horizontal axis represents the (Ds-Dr1)(Ds-Dr2) value increasing from left to right. As can be seen from the graph, as the (Ds-Dr1)(Ds-Dr2) value gradually increases, the motor efficiency gradually decreases. The slope of the decrease in motor efficiency is steeper when the value is greater than 0.8 mm, meaning that the motor efficiency decreases faster.

[0045] Because the teeth 120 of the first stator section 101 are wider and the air gap between them and the rotor 200 is also larger, this helps to distribute the magnetic field more evenly during motor operation. By strictly controlling the air gap difference within the range of 0 < (Ds-Dr1) - (Ds-Dr2) < 0.8 mm, the motor efficiency can be maintained within a relatively stable range, and fine adjustment of the magnetic field distribution can be achieved without significantly increasing the overall size.

[0046] This can also be achieved by adjusting the inner diameter of stator 100:

[0047] Reference Figure 1 Specifically, the outer diameter of the rotor 200 is Dr, the inner diameter of the first stator segment 101 is Ds1, and the inner diameter of the second stator segment 102 is Ds2, wherein Ds1-Dr > Ds2-Dr.

[0048] Increasing the inner diameter of the first stator section 101: The inner diameter of the first stator section 101 can be increased while keeping the outer diameter of the rotor 200 unchanged. This also increases the air gap between the first stator section 101 and the rotor 200.

[0049] Stepped stator 100 design: The stator 100 itself can be designed as a stepped shape with different inner diameters to accommodate different air gap requirements. For example, the interior of the first stator section 101 can be designed to be wider than that of the second stator section 102, thereby naturally increasing the gap between it and the rotor 200.

[0050] Specifically, 0 < (Ds1-Dr) - (Ds2-Dr) < 0.8 mm.

[0051] Reference Figure 7 , Figure 7 The graph shows the relationship between motor efficiency and 0 < (Ds-Dr1)(Ds-Dr2) < 0.8 mm. The vertical axis represents the motor efficiency value increasing from bottom to top, and the horizontal axis represents the (Ds-Dr1)(Ds-Dr2) value increasing from left to right. As can be seen from the graph, as the (Ds-Dr1)(Ds-Dr2) value gradually increases, the motor efficiency gradually decreases. The slope of the decrease in motor efficiency is steeper when the value is greater than 0.8 mm, meaning that the motor efficiency decreases faster.

[0052] An increased air gap can reduce the magnetic field strength in a specific area, thereby reducing local magnetic saturation. A larger air gap not only helps to disperse the magnetic field but also reduces iron loss. By strictly controlling the air gap difference within the range of 0 < (Ds1-Dr) - (Ds2-Dr) < 0.8 mm, fine adjustment of the magnetic field distribution can be achieved without significantly increasing the overall size.

[0053] Alternatively, the two methods mentioned above can be combined: In some cases, to achieve the best results, the above methods can be combined. For example, slightly increasing the inner diameter of the first stator section 101 while slightly decreasing the outer diameter of the corresponding part of the rotor 200 can achieve the desired air gap difference.

[0054] Rotor outer diameter (Dr) measurement start and end points: Starting from the centerline of the rotor shaft, measure the diameter of a complete circle along a plane perpendicular to the axis (i.e., the radial plane) at the maximum profile of the rotor (usually the outer edge of the permanent magnet or winding). (Measurements should be taken on the same plane, using the average of at least three equally divided points on the circumference.)

[0055] The starting and ending points for measuring the inner diameter Ds1 of the first stator segment are: the straight-line distance from the bottom of the tooth root on the inner side of the yoke of the first stator segment, along the radial direction perpendicular to the axial direction, to the bottom of the corresponding stator core tooth root.

[0056] The inner diameter Ds2 of the second stator segment is measured in the same way as the inner diameter Ds1 of the first stator segment.

[0057] The starting and ending points for measuring the tooth width W of the first stator segment are the straight-line distance between two points relative to the tooth root of the first stator segment in the circumferential direction.

[0058] The minimum width wm of the second stator segment tooth is measured from the starting point to the ending point: the minimum straight-line distance among all two relative points at the root of the first stator segment in the circumferential direction, from the tooth tip to the tooth groove bottom in the second stator segment.

[0059] Reference Figure 5 Specifically, the total axial height of the first stator segment 101 is H1, and the total axial height of the second stator segment 102 is H2, satisfying the relationship: 3.5% ≤ H2 / (H1+H2) ≤ 20%. A reasonable ratio of H1 to H2 ensures a more uniform magnetic field distribution throughout the stator 100. A larger first stator segment 101 can carry more magnetic flux, reducing local oversaturation and maintaining the stability of the entire motor's magnetic field. A smaller H2 ratio means the second stator segment 102 occupies less space in the overall structure, allowing more magnetic flux to pass through the first stator segment 101, which helps improve the overall efficiency of the motor. Different applications have different performance requirements for the motor. By adjusting the ratio of H1 to H2, the motor can better adapt to various operating conditions. For example, when high torque output is required, appropriately increasing the height of the first stator segment 101 can provide stronger electromagnetic force; while when a compact design is required, the overall size can be optimized by adjusting the height of the second stator segment 102.

[0060] Axial height H1 / H2: The vertical distance from the mounting surface of the first stator section (such as the base or flange face) to its other end face. The clearance between the first / second stator section and the rotor must be measured in the same radial plane, taking the minimum value on the circumference (to avoid misjudgment due to tilt).

[0061] Specifically, the second stator segment 102 has at least one step in the circumferential direction due to the varying widths of the teeth 120; that is, the second stator segment 102 also has different tooth widths in the axial direction, forming one or two steps. Different tooth widths guide the magnetic flux along a predetermined path, avoiding local oversaturation caused by uneven magnetic field, and improving the overall efficiency of the motor. Existing technologies may suffer from uneven magnetic field distribution and magnetic saturation due to the simple structure of the stator 100. This solution aims to overcome these problems by providing teeth 120 of different widths on the second stator segment 102, offering a more effective solution.

[0062] Specifically, the second stator segment 102 comprises two segments, with the first stator segment 101 disposed between the two second stator segments 102. Sandwiching the first stator segment 101 between the two second stator segments 102 achieves a more uniform and controllable magnetic field distribution. The first stator segment 101 typically has a larger tooth width and a larger air gap, which helps to disperse the magnetic field and reduce local magnetic saturation. The second stator segments 102 on both sides can be designed with different tooth widths according to specific needs to adapt to the magnetic field strength requirements of different areas. By placing the first stator segment 101 between the two second stator segments 102, not only can the magnetic field distribution be effectively optimized, electromagnetic performance enhanced, and mechanical and electrical performance balanced, but the motor can also better adapt to different application requirements while maintaining cost-effectiveness. Furthermore, the narrow-width laminations 120mm at both ends of the motor stator axis reduce the end height.

[0063] Reference Figure 4 Furthermore, the width of the tooth 120 in the first stator segment 101 is W, and the minimum width of the tooth 120 in the second stator segment 102 is wm, where W-wm≥0.6mm; the maximum width of the stator tooth 120 is W, and the minimum width of the other tooth 120 is wm. Therefore, there exists 0.6≤W-wm≤W2<W. The area with smaller tooth width relative to the area with the largest tooth width must be controlled within a certain range. If it is too small, the stator insulation frame cannot be properly inserted into the iron core, and the insulation frame will protrude into the stator slot, thus causing the problem of occupying slot area, reducing the motor slot fill factor, and decreasing energy efficiency.

[0064] 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.

[0065] This utility model also proposes an air conditioning device that includes the motor of the above-described solution or a compressor that should have the above-described motor, and therefore has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be repeated here.

[0066] 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: The stator includes a yoke and a plurality of teeth extending inward from the yoke. The stator has a first stator segment and a second stator segment in the axial direction. The second stator segment is located at the end of the stator in the axial direction. The tooth width of the first stator segment in the circumferential direction is greater than the tooth width at the corresponding position of the second stator segment, forming a stepped structure in the axial direction. and The rotor is rotatably disposed on the stator; wherein the gap between the first stator section and the rotor is greater than the gap between the second stator section and the rotor.

2. The motor as described in claim 1, characterized in that, The outer diameter of the rotor is D. r The inner diameter of the first stator segment is D. s1 The inner diameter of the second stator segment is D. s2 , where D s1 -D r >D s2 -D r .

3. The motor as described in claim 2, characterized in that, 0<(D s1 -D r )-(D s2 -D r )<0.8mm。 4. The motor as described in claim 1, characterized in that, The inner diameter of the stator is D. s The rotor has an outer diameter of D. r1 The first rotor section and its outer diameter are D r2 The second rotor segment, where the first rotor segment corresponds to the first stator segment, and the second rotor segment corresponds to the second stator segment, wherein D s -D r1 >D s -D r2 .

5. The motor as described in claim 1, characterized in that, 0<(D s -D r1 )-(D s -D r2 )<0.8mm。 6. The motor as described in claim 1, characterized in that, The total axial height of the first stator segment is H1, and the total axial height of the second stator segment is H2, satisfying the relationship: 3.5% ≤ H2 / (H1+H2) ≤ 20%.

7. The motor as described in claim 1, characterized in that, The second stator segment has different tooth widths in the circumferential direction and has at least one step; and / or, the second stator segment comprises two, with the first stator segment disposed between the two second stator segments.

8. The motor as described in claim 1, characterized in that, The tooth width of the first stator segment is W, and the minimum tooth width of the second stator segment is w. m Ww m ≥0.6mm.

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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