Electric motor, fan and air conditioning equipment

Abstract

The utility model discloses a motor, fan and air conditioning equipment, and the motor includes stator assembly, rotor assembly and pivot, and the stator assembly includes stator core and stator winding, and the rotor assembly includes shaft sleeve and rotor subassembly, and the rotor subassembly includes rotor core and a plurality of magnetic pieces, and the air gap is formed between stator core and rotor core and air gap capacitance is C1, and the insulating piece is between rotor subassembly and shaft sleeve and insulation capacitance is C2, and the axial dimension of stator core is L1, and the axial dimension of rotor core is L2, and the diameter of the inscribed circle of the inner contour line of stator core is Phi1, and the diameter of the inscribed circle of the outer contour line of rotor core is Phi2, and the diameter of the inscribed circle of the outer contour line of shaft sleeve is Phi3, and the diameter of the inscribed circle of the one end contour line of a plurality of magnetic pieces towards shaft sleeve is Phi4, and 0.24<=K<=1.75. According to the motor of the utility model embodiment, the inscribed circle size of the outer contour of shaft sleeve is optimized and adjusted, and the bearing can be avoided from electric erosion caused by excessive shaft voltage.

Description

Technical Field

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

[0002] In related technologies, motors typically use additional components to connect the front and rear bearing chambers to protect against bearing erosion. However, this approach increases the number of motor parts, complicates the production process, and raises production costs. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one objective of the present invention is to provide a motor that can avoid bearing erosion caused by excessive shaft voltage, thereby improving the reliability of the motor and reducing production costs.

[0004] This utility model also proposes a fan having the above-mentioned motor.

[0005] This utility model also proposes an air conditioning device having the above-mentioned fan.

[0006] According to a first aspect of the present invention, the motor includes a stator assembly, a rotor assembly, and a shaft. The stator assembly includes a stator core and a stator winding. The stator core has an annular structure and a mounting hole in the middle. The stator winding is wound around the stator core. The rotor assembly is disposed in the mounting hole and includes a bushing and a rotor assembly. The rotor assembly is sleeved on the outside of the bushing and includes a rotor core and multiple magnetic components. The rotor core has multiple magnet slots, and the magnetic components are installed in the magnet slots. The shaft passes through the bushing and is connected to the bushing.

[0007] The stator core and rotor core have an air gap with a capacitance of C1. The rotor assembly and bushing have an insulating component with an insulation capacitance of C2. The axial dimension of the stator core is L1, and the axial dimension of the rotor core is L2. In the axial section of the motor, the inscribed circle diameter of the stator core's inner contour is Φ1, the circumscribed circle diameter of the rotor core's outer contour is Φ2, the circumscribed circle diameter of the bushing's outer contour is Φ3, and the inscribed circle diameter of the end of the multiple magnetic components facing the bushing is Φ4. The units for L1, L2, Φ1, Φ2, Φ3, and Φ4 are mm. 0.24≤K≤1.75.

[0008] According to the embodiment of the present invention, the thickness of the insulating component can be adjusted by adjusting the outer circumscribed circle Φ3 of the bushing outer contour, thereby changing the insulation capacitance C2. This ensures that the ratio of the insulation capacitance C2 to the air gap capacitance C1 is within a suitable range, which reduces the voltage difference between the inner and outer rings of the bearing on the shaft. While ensuring the shaft voltage meets the requirements, it avoids excessive shaft voltage that could lead to bearing erosion, thus extending the bearing's service life and improving the reliability of the motor. Compared with related technologies, the components connecting the front and rear bearing chambers are eliminated, reducing the number of motor components, simplifying production, and lowering the motor's production cost.

[0009] In some embodiments, the bushing has a plurality of mounting grooves, which are spaced apart circumferentially on the outer circumferential surface of the bushing. The insulating member includes an insulating ring and a plurality of insulating protrusions. The insulating ring is sleeved on the outer circumference of the bushing, and the plurality of insulating protrusions are spaced apart circumferentially on the inner circumferential surface of the insulating ring. The plurality of insulating protrusions are correspondingly engaged with the plurality of mounting grooves.

[0010] In some specific embodiments, the opening of the mounting groove is a constricted opening, and the shape of the insulating protrusion matches the shape of the mounting groove.

[0011] In some examples, the end of the magnet slot facing the bushing has a first slot, and the first slot has a first limiting protrusion for restricting the magnetic element from moving radially inward along the rotor core. The insulating ring is partially embedded in the first slot. The end of the magnet slot facing the stator core has a second slot, and the second slot has a second limiting protrusion for restricting the magnetic element from moving radially outward along the rotor core.

[0012] In some embodiments, Φ1 and Φ2 satisfy the condition: 0.65≤Φ2 / Φ1≤0.75.

[0013] In some embodiments, Φ3 and Φ4 satisfy the condition: 0.28≤Φ3 / Φ4≤0.93.

[0014] In some specific embodiments, the bushing has a shaft hole for the rotating shaft to pass through, the minimum diameter of the shaft hole is Φ5, and Φ3 and Φ5 satisfy the condition: 0.35≤Φ5 / Φ3≤0.78.

[0015] In some embodiments, the plurality of magnetic elements are arranged in a spoke-like pattern along the circumference of the rotor core.

[0016] In some specific embodiments, the thickness of the magnetic component in the circumferential direction of the rotor core is b, and b satisfies the condition: 5mm≤b≤9.5mm.

[0017] In some specific embodiments, in the axial section of the motor, at least two of the magnetic elements are centrally symmetrically distributed about the axis of the rotor core, and the minimum inscribed circle diameter of the two magnetic elements facing the end of the bushing is 22mm-33mm.

[0018] According to any one of the above embodiments, the stator core of the motor includes a stator yoke and a plurality of stator teeth, the plurality of stator teeth being circumferentially spaced on the inner circumferential surface of the stator yoke, and the stator winding being wound on the plurality of stator teeth.

[0019] In the axial section of the stator core, the multiple stator teeth have the same structure and are evenly distributed with the axis of the stator core as the center of symmetry. The outlines of the multiple stator teeth facing the rotor core are located on the same circumference.

[0020] The fan according to a second aspect of the present invention includes a wind turbine and a motor, wherein the motor is the motor described in any of the above embodiments, and the rotating shaft is connected to the wind turbine.

[0021] According to the embodiments of the present invention, by employing the motor described above, the fan can drive the impeller to rotate, thereby improving the performance of the fan and thus enhancing its reliability.

[0022] An air conditioning device according to a third aspect of the present invention includes a fan as described in the above embodiments.

[0023] According to the embodiments of the present invention, by employing the fan described above, the performance of the air conditioning equipment can be improved, thereby enhancing the reliability of the air conditioning equipment.

[0024] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0025] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0026] Figure 1 This is a schematic diagram of the structure of a motor according to an embodiment of the present utility model;

[0027] Figure 2 This is a side view of a motor according to an embodiment of the present utility model;

[0028] Figure 3 yes Figure 1 An enlarged view of part A shown in the image;

[0029] Figure 4 yes Figure 1 An enlarged view of section B shown;

[0030] Figure 5 yes Figure 1 An enlarged view of section C shown;

[0031] Figure 6 This is a graph showing the thickness of the insulating component of the motor versus the shaft voltage according to an embodiment of the present invention.

[0032] Figure 7 This is a structural block diagram of a fan according to an embodiment of the present utility model;

[0033] Figure 8 This is a structural block diagram of an air conditioning device according to an embodiment of the present utility model.

[0034] Figure label:

[0035] Motor 100;

[0036] Stator assembly 10; stator core 11; mounting hole 11a; stator yoke 111; stator teeth 112; stator slot 113; stator winding 12;

[0037] Rotor assembly 20; bushing 21; mounting groove 211; shaft hole 212; rotor assembly 22; rotor core 221; magnet slot 2211; first slot 22111; first limiting protrusion 22112; second slot 22113; second limiting protrusion 22114; magnetic component 222; insulating component 23; insulating ring 231; insulating protrusion 232;

[0038] Air gap 30;

[0039] Fan 400; impeller 41;

[0040] Air conditioning equipment 500. Detailed Implementation

[0041] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0042] The following is for reference. Figures 1-6 Description of a motor 100 according to an embodiment of the present utility model.

[0043] Reference Figure 1According to an embodiment of the present invention, the motor 100 includes a stator assembly 10 including a stator core 11 and a stator winding 12. The stator core 11 has an annular structure and a mounting hole 11a in the middle. The stator winding 12 is wound around the stator core 11.

[0044] The motor 100 also includes a rotor assembly 20 and a rotating shaft (not shown in the figure). The rotor assembly 20 is disposed in the mounting hole 11a. The rotor assembly 20 includes a bushing 21 and a rotor component 22. The rotor component 22 is sleeved on the outside of the bushing 21 and includes a rotor core 221 and a plurality of magnetic elements 222. The rotor core 221 is provided with a plurality of magnet slots 2211. The magnetic elements 222 are installed in the magnet slots 2211. The rotating shaft passes through the bushing 21 and is connected to the bushing 21.

[0045] In other words, the rotating shaft, rotor assembly 20 and stator assembly 10 are arranged radially from the inside to the outside of the motor 100.

[0046] For example, the stator core 11 can be made of a high-permeability material, such as multiple stator laminations (silicon steel sheets) stacked together. The rotor core 221 is provided with multiple magnet slots 2211, which can provide mounting positions for multiple magnetic components 222. The magnetic components 222 can be high-performance permanent magnet materials such as neodymium iron boron and ferrite.

[0047] When the stator winding 12 is energized, it generates a rotating magnetic field. The stator core 11 provides a closed path with low magnetic resistance for the magnetic flux generated by the stator winding 12, guiding the magnetic flux to the rotor assembly 20 and forming a complete magnetic circuit. The magnetic component 222 can provide a constant magnetic field. This magnetic field interacts with the magnetic field generated by the stator winding 12 to produce electromagnetic torque, driving the rotor assembly 20 to rotate, thereby causing the shaft and the load connected to it to rotate.

[0048] Among them, an air gap 30 is formed between the stator core 11 and the rotor core 221 with an air gap capacitance of C1, and an insulating element 23 is provided between the rotor assembly 22 and the bushing 21 with an insulation capacitance of C2.

[0049] Reference Figure 2 The axial dimension of the stator core 11 is L1, and the axial dimension of the rotor core 221 is L2. (Refer to...) Figure 1 , Figure 3 and Figure 4 In the axial section of the motor 100, the inscribed circle diameter of the inner contour of the stator core 11 is Φ1, the circumscribed circle diameter of the outer contour of the rotor core 221 is Φ2, the circumscribed circle diameter of the outer contour of the bushing 21 is Φ3, and the inscribed circle diameter of the contour of the end of the multiple magnetic components 222 facing the bushing 21 is Φ4.

[0050] Where L1, L2, Φ1, Φ2, Φ3, and Φ4 are in mm, and L1, L2, Φ1, Φ2, Φ3, and Φ4 satisfy the following conditions: 0.24≤K≤1.75. For example, K can be 0.24, 0.4, 0.6, 0.8, 1, 1.2, 1.4, 1.75, etc.

[0051] Specifically, when the motor 100 is working, there is a certain difference between the air gap capacitance and the insulation capacitance, which will generate a potential difference, and thus generate a shaft voltage on the rotating shaft. If the shaft voltage is too large, it will cause serious electrolytic corrosion to the bearing.

[0052] K is the ratio of the insulation capacitance C2 to the air gap capacitance C1. After multiple tests, the inventors confirmed that when 0.4≤K≤1.3, the shaft voltage is below 5V, which can prevent bearing electrolytic corrosion under the condition that the shaft voltage is qualified. The value of K is affected by L1, L2, Φ1, Φ2, Φ3, and Φ4. In actual production, the values ​​of L1, L2, Φ1, Φ2, and Φ4 are generally fixed. Therefore, by adjusting Φ3, the size of the insulation capacitance C2 can be changed, so that the value of K meets the design requirements.

[0053] According to the embodiment of the present invention, the thickness of the insulating component 23 can be adjusted by adjusting the outer circle Φ3 of the outer contour of the bushing 21, thereby changing the insulation capacitance C2. This ensures that the ratio of the insulation capacitance C2 to the air gap capacitance C1 is within a suitable range, which can reduce the voltage difference between the inner and outer rings of the bearing on the rotating shaft. While ensuring that the shaft voltage meets the requirements, it avoids excessive shaft voltage that could cause electrical erosion of the bearing, thus extending the service life of the bearing and improving the reliability of the motor 100. Compared with related technologies, the components connecting the front and rear bearing chambers are eliminated, which can reduce the number of components in the motor 100, simplify the production process, and reduce the production cost of the motor 100.

[0054] The bushing 21 can be an iron core, meaning that the bushing 21 and the rotor iron core 221 can be made of the same material. Of course, the bushing 21 can also be made of other metal materials. By setting the bushing 21, the structure of the shaft can be simplified, making it easier to form the insulating component 23. On the other hand, by changing the size of the bushing 21, the size of the insulating component 23 can be adjusted, thereby changing the insulation capacitance C2.

[0055] Reference Figure 4In some embodiments, the bushing 21 has a plurality of mounting grooves 211, which are spaced apart along the circumference of the bushing 21 on its outer circumferential surface. The insulating member 23 includes an insulating ring 231 and a plurality of insulating protrusions 232. The insulating ring 231 is sleeved on the outer circumference of the bushing 21, and the plurality of insulating protrusions 232 are spaced apart along the circumferential surface of the insulating ring 231 on its inner circumferential surface. The plurality of insulating protrusions 232 are correspondingly engaged with the plurality of mounting grooves 211.

[0056] The insulating component 23 uses an insulating ring 231 to fix multiple permanent magnets and rotor core 221, making them a whole. The insulating component 23 uses multiple insulating protrusions 232 to cooperate with multiple mounting grooves 211, which helps to improve the bonding force between the insulating component 23 and the bushing 21, thereby improving the connection reliability between the insulating component 23 and the bushing 21, and thus enabling the insulating component 23 to fix the bushing 21 and the rotor assembly 22.

[0057] For example, the insulating component 23 can be formed by injection molding. Specifically, it can be made of PPT material or other materials with good insulation properties. During injection molding, the bushing 21 and the rotor assembly 22 can be used as inserts, and insulating material is filled between the bushing 21 and the rotor assembly 22. After the insulating material cures, the insulating component 23 is formed.

[0058] Reference Figure 4 In some specific embodiments, the opening of the mounting groove 211 is a narrow opening, that is, the opening size of the mounting groove 211 is small, while the groove size is large. After the insulating protrusion 232 is engaged with the mounting groove 211, the opening of the mounting groove 211 can limit the insulating protrusion 232 in the radial direction, which can effectively prevent the insulating protrusion 232 from disengaging from the mounting groove 211 in the radial direction, making the engagement between the insulating component 23 and the bushing 21 more tight.

[0059] Furthermore, the shape of the insulating protrusion 232 matches the shape of the mounting groove 211, which increases the contact area between the insulating component 23 and the bushing 21, further improving the bonding force between the insulating component 23 and the bushing 21, thereby improving the connection reliability between the insulating component 23 and the bushing 21, and thus enabling the insulating component 23 to fix the bushing 21 and the rotor assembly 22.

[0060] Reference Figure 5 In some examples, the magnet slot 2211 has a first slot 22111 at one end facing the bushing 21, and a first limiting protrusion 22112 at the first slot 22111. The first limiting protrusion 22112 is used to restrict the magnetic element 222 from moving radially inward along the rotor core 221, and the insulating ring 231 is partially embedded in the first slot 22111.

[0061] The magnet slot 2211 has a second slot 22113 at one end facing the stator core 11, and a second limiting protrusion 22114 at the second slot 22113. The second limiting protrusion 22114 is used to limit the magnetic component 222 from moving outward along the radial direction of the rotor core 221.

[0062] Specifically, during the assembly process, the magnetic component 222 can be placed into the magnet slot 2211 along the axial direction; if a magnetic component 222 has a problem, the problematic magnetic component 222 can be removed and replaced in time along the axial direction. During this process, the first slot 22111 provides a certain operating space for the operator, making it convenient for the operator to perform pick-up and put-down operations in the radial direction.

[0063] For example, when the motor 100 is working, the rotor assembly 20 drives the rotating shaft to rotate together, and the magnetic element 222 in the magnet slot 2211 also rotates around the rotation axis of the rotating shaft. During this process, the magnetic element 222 may move radially inward along the rotor core 221. By providing a first limiting protrusion 22112 at the first slot 22111, the magnetic element 222 can be radially limited. At the same time, the insulating ring 231 is partially embedded in the first slot 22111, which can also limit the magnetic element 222 in both the axial and radial directions when it rotates, thereby restricting the magnetic element 222 from moving radially inward along the rotor core 221. During this process, the magnetic element 222 may also move radially outward along the rotor core 221. By providing a second limiting protrusion 22114 at the second slot 22113, the magnetic element 222 can be further limited, thereby restricting the magnetic element 222 from moving radially outward along the rotor core 221.

[0064] Reference Figure 3 In some embodiments, and The condition must be met: 0.65 ≤ Φ2 / Φ1 ≤ 0.75. For example, the value of Φ2 / Φ1 can be 0.65, 0.67, 0.69, 0.7, 0.72, 0.75, etc.

[0065] For a motor 100 with fixed external dimensions, if Φ2 / Φ1 < 0.65, the outer diameter of the rotor core 221 will be too small, the arrangement space of the magnet slot 2211 will be reduced accordingly, and the volume of the magnetic component 222 will also be reduced. This will reduce the magnetic field energy provided by the magnetic component 222, and will not be able to meet the torque and efficiency required by the motor 100.

[0066] If Φ2 / Φ1 > 0.75, the outer diameter of the rotor core 221 will be too large, and the inner diameter of the stator core 11 will be reduced accordingly. This will result in a reduction in the area that the stator winding 12 can be wound, thereby weakening the magnetic field generated after the stator winding 12 is energized. Ultimately, this will reduce the electromagnetic torque generated by the interaction of the magnetic fields of the stator winding 12 and the magnetic component 222, which will also fail to meet the torque required by the motor 100.

[0067] Therefore, by limiting the value of Φ2 / Φ1 to 0.65-0.75, the torque of motor 100 can be guaranteed, thereby ensuring the performance of motor 100.

[0068] Reference Figure 4 In some embodiments, Φ3 and Φ4 satisfy the condition: 0.28 ≤ Φ3 / Φ4 ≤ 0.93. For example, the value of Φ3 / Φ4 can be 0.28, 0.3, 0.4, 0.6, 0.8, 0.9, 0.93, etc.

[0069] If Φ3 / Φ4 > 0.93, meaning the circumscribed circle diameter Φ3 of the bushing 21 is too large, the thickness of the insulating component 23 will be too small. If the insulating component 23 is made of PPT injection molding, the existing process cannot inject the PPT material into the gap between the bushing 21 and the magnetic component 222 under this size. Furthermore, the small gap between the bushing 21 and the magnetic component 222 in this case is not conducive to the subsequent installation of the rotating shaft.

[0070] If Φ3 / Φ4 < 0.28, that is, the outer circle diameter Φ3 of the outer contour of the bushing 21 is too small, this will result in a large gap between the bushing 21 and the magnetic component 222. At this time, a thicker insulating component 23 is required, which will cause the insulation capacitance C2 and the air gap capacitance C1 to differ significantly. This will make it impossible to ensure that the shaft voltage is within the preset range, which may cause severe electrolytic corrosion of the bearing.

[0071] Therefore, under the existing process, by limiting Φ3 / Φ4 to 0.28-0.93, the insulating part 23 can be placed in the gap between the bushing 21 and the magnetic part 222, and the shaft voltage can be kept within the preset range to avoid severe electrolytic corrosion of the bearing.

[0072] Reference Figure 4 In some specific embodiments, the bushing 21 has a shaft hole 212 for the rotating shaft to pass through. Specifically, after the stator assembly 10 and the rotor assembly 20 are installed, the rotating shaft can be inserted through the shaft hole 212 to assemble the rotating shaft with the rotor assembly 20.

[0073] The minimum diameter of the shaft hole 212 is Φ5, and Φ3 and Φ5 satisfy the condition: 0.35≤Φ5 / Φ3≤0.78. For example, the value of Φ5 / Φ3 can be 0.35, 0.4, 0.5, 0.6, 0.7, 0.78, etc.

[0074] Since the radial dimension of the shaft hole 212 determines the radial dimension of the shaft, when the outer dimension of the bushing 21 is fixed, if Φ5 / Φ3<0.35, the minimum diameter Φ5 of the shaft hole 212 is smaller. This results in a smaller diameter of the shaft that fits with it, and a weaker mechanical strength of the shaft, making it unable to withstand a large load.

[0075] If Φ5 / Φ3>0.78, the minimum diameter Φ5 of the shaft hole 212 is relatively large, and the outer circle diameter of the outer contour of the bushing 21 is relatively small. Since multiple mounting slots 211 need to be set on the bushing 21, when Φ5 / Φ3>0.78, it is impossible to reserve enough setting area for the mounting slots 211 on the bushing 21.

[0076] Therefore, in the above technical solution, by limiting Φ5 / Φ3 to meet the above range, it is possible to ensure the structural strength of the rotating shaft that mates with the shaft hole 212, and to reserve sufficient space for the mounting groove 211 on the bushing 21.

[0077] Reference Figure 1 and Figure 5 In some embodiments, multiple magnetic elements 222 are arranged in a spoke-like pattern along the circumference of the rotor core 221. That is, each magnetic element 222 extends radially along the rotor core 221.

[0078] Therefore, by setting multiple magnetic components 222 to be arranged in a spoke-like manner along the circumference of the rotor core 221, not only can alternating N and S magnetic pole pairs be formed, which is beneficial for the magnetic field generated by multiple magnetic components 222 to interact with the magnetic field provided by the stator winding 12 to generate torque, but also ensures that the mass of the rotor assembly 20 is evenly distributed, and avoids the rotor assembly 20 from shifting due to uneven mass when rotating.

[0079] In some specific embodiments, the thickness of the magnetic component 222 in the circumferential direction of the rotor core 221 is b, where b satisfies the condition: 5mm ≤ b ≤ 9.5mm. For example, the thickness of the magnetic component 222 in the circumferential direction of the rotor core 221 can be 5mm, 5.5mm, 6mm, 7mm, 8mm, 9mm, or 9.5mm.

[0080] Understandably, the thickness of the magnetic component 222 on the rotor core 221 determines the magnitude of the magnetic field provided by the magnetic component 222. If the thickness of the magnetic component 222 is small, the interaction between the magnetic field provided by the magnetic component 222 and the magnetic field generated by the stator winding 12 is weak, and the generated electromagnetic torque cannot meet the requirements of the motor 100. If the thickness of the magnetic component 222 is large, the number that can be arranged around the rotor core 221 will be reduced, the interaction between the magnetic field provided by the magnetic component 222 and the magnetic field generated by the stator winding 12 will also be weakened, and the electromagnetic torque generated by the interaction between the two cannot drive the rotor assembly 20 to rotate at a uniform speed, which is not conducive to providing continuous electromagnetic torque.

[0081] Therefore, in the above technical solution, by limiting the thickness of the magnetic component 222 in the circumferential direction of the rotor core 221 to the above range, it can be ensured that the magnetic field provided by the magnetic component 222 interacts with the magnetic field generated by the stator winding 12, which can generate sufficient electromagnetic torque and improve the performance of the motor 100.

[0082] In some specific embodiments, in the axial section of the motor 100, at least two magnetic elements 222 are centrally symmetrically distributed about the axis of the rotor core 221, which can ensure that the magnetic elements 222 can provide uniform magnetic pole pairs, which facilitates the formation of a uniform and opposing magnetic field that interacts with the magnetic field generated by the stator winding 12.

[0083] The minimum inscribed circle diameter of the contour lines of the two magnetic components 222 facing the bushing 21 is 22mm-33mm. The minimum inscribed circle diameter of the contour lines of the two magnetic components 222 facing the bushing 21 determines the thickness of the insulating component 23. By limiting the diameter of this minimum inscribed circle to 22mm-33mm, it can be ensured that the magnetic component 222 will not become too small due to the size of the insulating component 23 being too large, resulting in insufficient magnetic field provided by the magnetic component 222 and affecting the interaction with the magnetic field generated by the stator winding 12. At the same time, it can also prevent the difference between the insulation capacitance C2 and the air gap capacitance C1 from being too large due to the thickness of the insulating component 23, thereby causing the shaft voltage to be too large.

[0084] like Figure 1 As shown, according to some embodiments of the present invention, the stator core 11 includes a stator yoke 111 and a plurality of stator teeth 112. The plurality of stator teeth 112 are arranged at intervals along the circumference of the stator yoke 111 on the inner circumferential surface of the stator yoke 111, and the stator winding 12 is wound around the plurality of stator teeth 112.

[0085] Specifically, the stator yoke 111, as the outermost ring of the stator core 11, connects all the stator teeth 112 to form the outer ring path of the magnetic circuit. The stator teeth 112 provide a winding carrier for the stator winding 12, facilitating the winding of the stator winding 12. A stator slot 113 is defined between two adjacent stator teeth 112, providing a space to accommodate the stator winding 12.

[0086] In the axial section of the stator core 11, the multiple stator teeth 112 have the same structure and are evenly distributed with the axis of the stator core 11 as the center of symmetry. The outlines of the multiple stator teeth 112 facing the rotor core 221 are located on the same circumference.

[0087] This configuration allows the stator winding 12 to generate a uniform magnetic field when energized. After being guided by the stator teeth 112 to the vicinity of the magnetic component 222, the magnetic component 222 can interact with the magnetic field provided by the magnetic component 222 to generate a continuous and stable electromagnetic torque.

[0088] Figure 6 A graph showing the thickness of the insulating component 23 of the motor 100 according to an embodiment of the present invention and the relationship between the shaft voltage is shown. It can be seen that by adjusting the thickness of the insulating component 23, the shaft voltage can be changed. On the basis of meeting the requirements of the shaft voltage, the excessive shaft voltage can be avoided, which can lead to electrical erosion of the bearing. This is beneficial to extending the service life of the bearing and thus improving the reliability of the motor 100.

[0089] The following is combined with Figure 7 A fan 400 according to an embodiment of the present utility model is described.

[0090] like Figure 7 As shown, the fan 400 according to an embodiment of the present utility model includes a fan wheel 41 and a motor 100. The motor 100 is the motor 100 according to any of the above embodiments, and the rotating shaft is connected to the fan wheel 41.

[0091] According to the embodiment of the present utility model, the fan 400 uses the motor 100 of the above embodiment, which can drive the impeller 41 to rotate, thereby improving the performance of the fan 400 and improving the reliability of the fan 400.

[0092] The following is combined with Figure 8 A fan 400 according to an embodiment of the present utility model is described.

[0093] like Figure 8 As shown, the air conditioning device 500 according to an embodiment of the present invention includes a fan 400 according to the above embodiment. For a split air conditioner, the fan 400 can be used in both the indoor and outdoor units.

[0094] According to the embodiment of the present utility model, by adopting the fan 400 of the above embodiment, the performance of the air conditioning equipment 500 can be improved, thereby improving the reliability of the air conditioning equipment 500.

[0095] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0096] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An electric motor, characterized in that, include: A stator assembly includes a stator core and a stator winding. The stator core has an annular structure and a mounting hole in the middle. The stator winding is wound around the stator core. A rotor assembly is disposed within the mounting hole and includes a bushing and a rotor assembly. The rotor assembly is sleeved on the outside of the bushing and includes a rotor core and multiple magnetic components. The rotor core is provided with multiple magnet slots, and the magnetic components are installed in the magnet slots. A rotating shaft, which passes through and is connected to the bushing; Wherein, an air gap is formed between the stator core and the rotor core with an air gap capacitance of C1; an insulating element is provided between the rotor assembly and the bushing with an insulation capacitance of C2; the axial dimension of the stator core is L1; the axial dimension of the rotor core is L2; ​​in the axial section of the motor, the inscribed circle diameter of the inner contour line of the stator core is Φ1; the circumscribed circle diameter of the outer contour line of the rotor core is Φ2; the circumscribed circle diameter of the outer contour line of the bushing is Φ3; and the inscribed circle diameter of the contour line of the end of the plurality of magnetic elements facing the bushing is Φ4. The units for L1, L2, Φ1, Φ2, Φ3, and Φ4 are mm. 0.24≤K≤1.

75.

2. The motor according to claim 1, characterized in that, The bushing has multiple mounting slots, which are spaced apart circumferentially on the outer circumferential surface of the bushing. The insulating element includes: An insulating ring, wherein the insulating ring is sleeved on the outer periphery of the bushing; Multiple insulating protrusions are spaced apart along the circumference of the insulating ring on the inner circumferential surface of the insulating ring, and the multiple insulating protrusions are matched one-to-one with the multiple mounting grooves.

3. The motor according to claim 2, characterized in that, The groove of the mounting groove is a constricted opening, and the shape of the insulating protrusion matches the shape of the mounting groove.

4. The motor according to claim 2, characterized in that, The magnet slot has a first slot at one end facing the bushing, and a first limiting protrusion at the first slot to restrict the magnetic component from moving radially inward along the rotor core. The insulating ring is partially embedded in the first slot. The magnet slot has a second slot at one end facing the stator core, and a second limiting protrusion at the second slot to restrict the magnetic component from moving radially outward along the rotor core.

5. The motor according to claim 1, characterized in that, The Φ1 and Φ2 satisfy the condition: 0.65≤Φ2 / Φ1≤0.

75.

6. The motor according to claim 1, characterized in that, The Φ3 and Φ4 satisfy the condition: 0.28≤Φ3 / Φ4≤0.

93.

7. The motor according to claim 1, characterized in that, The bushing has a shaft hole for the rotating shaft to pass through, the minimum diameter of the shaft hole is Φ5, and Φ3 and Φ5 satisfy the condition: 0.35≤Φ5 / Φ3≤0.

78.

8. The motor according to claim 1, characterized in that, The plurality of magnetic components are arranged in a spoke-like pattern along the circumference of the rotor core.

9. The motor according to claim 8, characterized in that, The thickness of the magnetic component in the circumferential direction of the rotor core is b, and b satisfies the condition: 5mm≤b≤9.5mm.

10. The motor according to claim 8, characterized in that, In the axial section of the motor, at least two of the magnetic elements are centrally symmetrically distributed about the axis of the rotor core, and the minimum inscribed circle diameter of the end profile of the two magnetic elements facing the bushing is 22mm-33mm.

11. The motor according to any one of claims 1-10, characterized in that, The stator core includes a stator yoke and a plurality of stator teeth. The plurality of stator teeth are arranged circumferentially on the inner circumferential surface of the stator yoke, and the stator winding is wound on the plurality of stator teeth. In the axial section of the stator core, the multiple stator teeth have the same structure and are evenly distributed with the axis of the stator core as the center of symmetry. The outlines of the multiple stator teeth facing the rotor core are located on the same circumference.

12. A fan, characterized in that, It includes a wind turbine and a motor, wherein the motor is the motor according to any one of claims 1-11, and the rotating shaft is connected to the wind turbine.

13. An air conditioning device, characterized in that, Including the wind turbine as described in claim 12.

Images