A single-phase capacitor-run asynchronous motor

Abstract

The application provides a single-phase capacitor-operated asynchronous motor, which comprises a stator core, a rotor core and a rotor end ring, the stator core is located at the outer periphery of the rotor core, the rotor end ring is arranged at the axial end of the rotor core, the axial height of the stator core is L1, the axial height of the rotor core is L2, the axial height of the rotor end ring is H, L2>L1 is met, and C1*L2+K1*|L1-L2|≤H≤C2*L2+K2*|L1-L2| is met, wherein 0.4≤C1≤0.6, 0.5≤C2≤0.7, 0.8≤K1≤1.0 and 0.7≤K2≤1.1. According to the application, the magnetic leakage can be reduced, the starting torque can be improved, and the motor efficiency can be improved; the problems of the single-phase capacitor-operated asynchronous motor in the prior art, such as the magnetic leakage, the insufficient starting torque and the low motor efficiency, can be effectively solved.

Description

Technical Field

[0001] This invention relates to the field of motor technology, specifically to a single-phase capacitor-operated asynchronous motor, which belongs to the category of energy-saving motor equipment. Background Technology

[0002] Existing single-phase capacitor-run asynchronous motors are commonly used in household appliances, small machinery, and other applications, and their operating performance directly affects the efficiency of the equipment. In traditional structures, unreasonable rotor core design can easily lead to magnetic leakage, resulting in problems such as insufficient starting torque and low motor efficiency.

[0003] Because existing single-phase capacitor-operated asynchronous motors suffer from leakage flux, resulting in insufficient starting torque and low motor efficiency, this invention researches and designs a single-phase capacitor-operated asynchronous motor, which is an energy-saving motor device. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects of leakage flux in the existing single-phase capacitor-run asynchronous motor, which leads to insufficient starting torque and low motor efficiency, and thus provide a single-phase capacitor-run asynchronous motor, which belongs to the category of energy-saving motor equipment.

[0005] To address the above problems, the present invention provides a single-phase capacitor-operated asynchronous motor, comprising:

[0006] The system comprises a stator core, a rotor core, and a rotor end ring. The stator core is located on the outer periphery of the rotor core, and the rotor end ring is located at the axial end of the rotor core. The axial height of the stator core is L1, the axial height of the rotor core is L2, and the axial height of the rotor end ring is H. Given that L2 > L1, and satisfying C1*L2 + K1*|L1-L2| ≤ H ≤ C2*L2 + K2*|L1-L2|, where 0.4 ≤ C1 ≤ 0.6, 0.5 ≤ C2 ≤ 0.7, 0.8 ≤ K1 ≤ 1.0, and 0.7 ≤ K2 ≤ 1.1.

[0007] In some implementations...

[0008] 0.12L2≤H≤0.22L2.

[0009] In some implementations...

[0010] The rotor core is formed by stacking multiple rotor laminations along its axial direction. Each rotor lamination has multiple squirrel cage slots. The squirrel cage slots penetrate the rotor lamination along the axial direction. At the outer circumferential surface of the rotor lamination, the squirrel cage slots form slot openings. A solid rotor tooth is formed between two adjacent slot openings along the circumferential direction of the rotor core lamination. The circumferential width of the rotor tooth is W1.

[0011] Furthermore, the slots of two adjacent rotor laminations are not opposite each other along the axial direction of the rotor core, forming an offset. From one side of the rotor core to the other side, the slots of multiple rotor laminations are offset and connected in the same circumferential direction, forming rotor skew slots. The minimum distance between two circumferentially adjacent rotor skew slots along the circumferential direction of the rotor core is the skew slot width W2.

[0012] And it satisfies: 0.9W1≤W2≤1.2W1.

[0013] In some implementations...

[0014] It also includes a rotating shaft. The rotor core has a central shaft hole. The rotating shaft passes through the central shaft hole and extends out of the axial end of the rotor core. The rotating shaft is supported by a first bearing. A first end cap is provided on the outer periphery and axial side of the first bearing. A plastic sealing structure is provided on the outer periphery and axial side of the first end cap, such that the first end cap is located between the first bearing and the plastic sealing structure. The radial thickness of the portion of the first end cap located on the outer periphery of the first bearing is m. The radial thickness of the portion of the plastic sealing structure located on the outer periphery of the first end cap is m2. The axial thickness of the portion of the plastic sealing structure located on the axial side of the first end cap is m1, and m1≥2.5*m and m2≥2*m are satisfied.

[0015] In some implementations...

[0016] The shaft extending from the other axial end of the rotor core is supported by a second bearing. A second end cap is provided on the outer periphery and axial side of the second bearing. The shaft extending from one axial end of the rotor core is defined as a first shaft segment, and the shaft extending from the other axial end of the rotor core is defined as a second shaft segment. The length of the second shaft segment is less than the length of the first shaft segment, and the second end cap seals the shaft end of the second shaft segment. The first shaft segment passes through the first end cap and the plastic sealing structure.

[0017] In some implementations...

[0018] Along the axial direction of the rotating shaft, the minimum distance between the first bearing and the second bearing is L3.

[0019] The rotor end ring includes a first end ring disposed at one axial end of the rotor core and a second end ring disposed at the other axial end of the rotor core, wherein the maximum distance between the first end ring and the second end ring along the axial direction is L4;

[0020] And it satisfies: 1.2*L4≤L3≤1.6*L4.

[0021] In some implementations...

[0022] Along the axial direction of the rotor core, the minimum axial distance between the end of the second shaft segment and the axial end of the rotor core is L5, and the minimum axial distance between the end of the first shaft segment and the axial end of the rotor core is L6, satisfying: 1.12*L2≤L5≤1.14*L2, 3.59*L2≤L6≤3.61*L2.

[0023] In some implementations...

[0024] Along the axial direction of the rotor core, the axial thickness of the portion of the encapsulated structure located between the first end cap and the rotor core is m3, and satisfies: m3≥1.5m.

[0025] In some implementations...

[0026] It also includes a molding compound housing, wherein a portion of the molding compound housing is located on the outer periphery of the stator core, a portion of the molding compound housing is located on one axial side of the stator core, and a portion of the molding compound housing is located on the other axial side of the stator core, and the molding compound housing and the molding compound structure are integrally injection molded.

[0027] The outer diameter of the stator core is D1, and the outer diameter of the plastic sealing housing is D2, satisfying D2≥1.05*D1.

[0028] In some implementations...

[0029] The first end cap is injection molded as a whole with the stator core through the molding structure and the molding machine housing. The second end cap is interference-fitted with the molding machine housing. The stator core is spliced ​​into a circle by multiple stator teeth and multiple stator yokes of straight bar structure, and has multiple tooth groove structure. After being spliced ​​into a circle, an insulating skeleton is fitted, and then the winding coil is wound on the insulating skeleton.

[0030] The single-phase capacitor-operated asynchronous motor provided by this invention has the following beneficial effects:

[0031] 1. This invention provides a new method for matching the stator and rotor stack heights and end ring heights of a single-phase capacitor-run asynchronous motor by setting the axial height L2 of the rotor core to be greater than the axial height L1 of the stator core, i.e., L2 > L1, forming a structure with unequal stator and rotor heights, with the rotor height being greater than the stator height. Simultaneously, the axial height H of the rotor end ring (the axial height of the end ring on one side of the rotor core) is set to satisfy the following relationship with L1 and L2: C1*L2 + K1*|L1-L2| ≤ H ≤ C2*L2 + K2*|L1-L2|, where 0.4 ≤ C1 ≤ 0.6, 0.5 ≤ C2 ≤ 0.7, 0.8 ≤ K1 ≤ 1.0, and 0.7 ≤ K2 ≤ 1.1. This provides a new method for matching the stator and rotor stack heights and end ring heights of a single-phase capacitor-run asynchronous motor. Under this matching condition, leakage flux can be reduced, starting torque can be increased, motor efficiency can be improved, and the problem of insufficient starting torque can be solved. This effectively solves the problem of leakage flux in existing single-phase capacitor-run asynchronous motors, which leads to insufficient starting torque and low motor efficiency.

[0032] 2. Furthermore, this invention further sets the circumferential width W1 of the rotor teeth and the slot width W2 of the rotor slot in the rotor core of the unidirectional capacitor-operated asynchronous motor to satisfy the relationship: 0.9W1≤W2≤1.2W1. This effectively weakens the cogging effect, reduces noise, and solves the problem of excessive noise. Figure 7 As shown; the present invention further sets the axial thickness m1 and radial thickness m2 of the plastic sealing structure at the first end cap to satisfy the relationship m1≥2.5*m, m2≥2*m, which can establish a correlation between the coverage thickness of the plastic sealing layer of the end cap and the radial thickness of the end cap, thereby improving the sealing performance and mechanical strength, further improving motor noise, and further improving motor efficiency.

[0033] 3. The present invention further establishes a correlation between the minimum distance L3 between the first and second bearings supporting the rotor shaft on both sides of the rotor core and the maximum distance L4 between the first and second end rings at both ends of the rotor core, satisfying the relationship: 1.2*L4≤L3≤1.6*L4. This parameter correlation ensures the compactness of the shaft system structure and increases modal strength. The present invention further satisfies the relationship between the minimum axial distance L5 between the second shaft segment and the rotor core shaft end and the minimum axial distance L6 between the shaft end of the first shaft segment and the rotor core shaft end: 1.12*L2≤L5≤1.14*L2, 3.59*L2≤L6≤3.61*L2. This can ensure the maximum output torque of the motor while further reducing the noise of the motor.

[0034] 4. Furthermore, this invention further enhances the end cover support strength and improves noise reduction by setting the axial thickness m3 of the portion of the encapsulated structure located between the first end cover and the rotor core, and the radial thickness m of the first end cover, to satisfy the relationship: m3 ≥ 1.5m; this invention also further enhances the roundness of the encapsulated structure after it is formed into a circle. Figure 3 The outer diameter D1 of the stator core (the outer diameter of the circumscribed circle of the stator core) and the outer diameter D2 of the sealing machine housing satisfy D2≥1.05*D1, which can effectively ensure the thickness of the sealing machine housing and effectively increase the strength of the stator. Attached Figure Description

[0035] Figure 1 This is a longitudinal sectional side view of the single-phase capacitor-operated asynchronous motor of the present invention.

[0036] Figure 2 yes Figure 1 Dimensional structure diagram of a single-phase capacitor-operated asynchronous motor;

[0037] Figure 3 yes Figure 1 The structural diagrams of the stator core before and after it is rounded;

[0038] Figure 4 yes Figure 1 Top and side views of the rotor core;

[0039] Figure 5 This is a motor efficiency-speed curve when the inequalities of H, L1, and L2 are satisfied (compared to the prior art).

[0040] Figure 6 This is the motor efficiency-speed curve of the single-phase capacitor-operated asynchronous motor of the present invention (compared to the prior art).

[0041] Figure 7 This is a noise rate-speed curve of the single-phase capacitor-operated asynchronous motor of the present invention (compared to the prior art).

[0042] The reference numerals in the attached figures are as follows:

[0043] 1. Stator core; 2. Rotor core; 21. Squirrel cage slot; 22. Slot opening; 23. Rotor teeth; 24. Rotor skew slot; 3. Winding coil; 4. Rotor end ring; 41. First end ring; 42. Second end ring; 5. Shaft; 51. First shaft section; 52. Second shaft section; 6. First bearing; 7. First end cover; 8. Plastic-encapsulated structure; 9. Second bearing; 10. Second end cover; 11. Plastic-encapsulated housing; 12. Insulating frame. Detailed Implementation

[0044] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0046] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0047] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0048] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0049] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0050] like Figure 1-7 As shown, the present invention provides a single-phase capacitor-operated asynchronous motor, which includes:

[0051] The rotor consists of a stator core 1, a rotor core 2, and a rotor end ring 4. The stator core 1 is located on the outer periphery of the rotor core 2, and the rotor end ring 4 is located at the axial end of the rotor core 2. The axial height of the stator core 1 is L1, the axial height of the rotor core 2 is L2, and the axial height of the rotor end ring 4 is H. The following conditions are met: L2 > L1, and the following condition is satisfied: C1*L2 + K1*|L1-L2| ≤ H ≤ C2*L2 + K2*|L1-L2|, where 0.4 ≤ C1 ≤ 0.6 (preferably 0.5), 0.5 ≤ C2 ≤ 0.7 (preferably 0.6), 0.8 ≤ K1 ≤ 1.0 (preferably 0.9), and 0.7 ≤ K2 ≤ 1.1 (preferably 0.9).

[0052] This invention provides a new method for matching the stator and rotor stack heights and end ring heights of a single-phase capacitor-run asynchronous motor by setting the axial height L2 of the rotor core to be greater than the axial height L1 of the stator core (i.e., L2 > L1), thus forming a structure with unequal stator and rotor heights and the rotor height being greater than the stator height. Simultaneously, the axial height H of the rotor end ring (the axial height of the end ring on one side of the rotor core) is set to satisfy the following relationship with L1 and L2: C1*L2 + K1*|L1-L2| ≤ H ≤ C2*L2 + K2*|L1-L2|, where 0.4 ≤ C1 ≤ 0.6, 0.5 ≤ C2 ≤ 0.7, 0.8 ≤ K1 ≤ 1.0, and 0.7 ≤ K2 ≤ 1.1. This method reduces magnetic leakage, increases starting torque, improves motor efficiency, and solves the problem of insufficient starting torque. It effectively addresses the problem of insufficient starting torque and low motor efficiency caused by magnetic leakage in existing single-phase capacitor-run asynchronous motors.

[0053] In some implementations...

[0054] 0.12L2≤H≤0.22L2.

[0055] The present invention satisfies the relationship between the rotor end ring shaft height and the rotor shaft height as follows: 0.12L2≤H≤0.22L2 (the axial thickness of the end ring is H, and the rotor stack height is L2), which can improve the motor speed and further improve the motor efficiency during high-speed operation. The present invention further optimizes the rotor slot casting aluminum, and finally forms squirrel cage end rings at both ends of the rotor core. By short-circuiting the end rings at both ends of the core, a squirrel cage structure is formed.

[0056] In some implementations...

[0057] The rotor core 2 is formed by stacking multiple rotor laminations along its axial direction. Each rotor lamination has multiple squirrel cage slots 21 (preferably 18 evenly distributed squirrel cage slots). The squirrel cage slots 21 penetrate the rotor lamination along the axial direction. At the outer circumferential surface of the rotor lamination, the squirrel cage slots 21 form slot openings 22. Solid rotor teeth 23 are formed between two adjacent slot openings 22 along the circumferential direction of the rotor core lamination. The circumferential width of the rotor teeth 23 is W1.

[0058] Furthermore, the slots 22 of two adjacent rotor laminations are not opposite each other along the axial direction of the rotor core 2, forming an offset. From one side of the rotor core 2 to the other side, the slots 22 of multiple rotor laminations are offset and connected in the same circumferential direction, forming rotor skew slots 24. The minimum distance between two circumferentially adjacent rotor skew slots 24 along the circumferential direction of the rotor core 2 is the skew slot width W2.

[0059] And it satisfies: 0.9W1≤W2≤1.2W1.

[0060] The present invention further sets the circumferential width W1 of the rotor teeth and the skew width W2 of the rotor slot of the rotor core of the unidirectional capacitor-operated asynchronous motor to satisfy the relationship: 0.9W1≤W2≤1.2W1. This structure can make full use of the slot area, make the magnetic flux density of the teeth uniform, effectively weaken the cogging effect, reduce noise, solve the problem of excessive noise, and improve the motor operating performance.

[0061] In some implementations...

[0062] The system also includes a rotating shaft 5. The rotor core 2 has a central shaft hole through which the rotating shaft 5 passes. The rotating shaft 5, extending from one axial end of the rotor core 2, is supported by a first bearing 6. A first end cap 7 is provided on the outer periphery and axial side of the first bearing 6. A plastic sealing structure 8 is provided on the outer periphery and axial side of the first end cap 7, such that the first end cap 7 is located between the first bearing 6 and the plastic sealing structure 8. The radial thickness of the portion of the first end cap 7 located on the outer periphery of the first bearing 6 is m, the radial thickness of the portion of the plastic sealing structure 8 located on the outer periphery of the first end cap 7 is m2, and the axial thickness of the portion of the plastic sealing structure 8 located on the axial side of the first end cap 7 is m1, satisfying m1≥2.5*m and m2≥2*m. In this document, radial and axial directions refer to the radial and axial directions of the rotor core, i.e., the radial and axial directions of the rotating shaft.

[0063] Furthermore, by setting the axial thickness m1 and radial thickness m2 of the plastic sealing structure at the first end cap to satisfy the relationship m1 ≥ 2.5m, m2 ≥ 2m, the present invention can establish a correlation between the coverage thickness of the plastic sealing layer of the end cap and the radial thickness of the end cap, thereby improving the sealing performance and mechanical strength, further reducing motor noise, and further improving motor efficiency.

[0064] The thickness of the plastic seal layer of the front cover of the present invention can also be adjusted according to the actual application environment. For example, in a high humidity environment, m1 can be increased to 3*m and m2 can be increased to 2.5*m, which can further improve the sealing performance.

[0065] In some implementations...

[0066] The rotating shaft 5 extending from the other axial end of the rotor core 2 is supported by a second bearing 9. A second end cap 10 is provided on the outer periphery and axial side of the second bearing 9. The rotating shaft 5 extending from one axial end of the rotor core 2 is defined as the first shaft segment 51, and the rotating shaft 5 extending from the other axial end of the rotor core 2 is defined as the second shaft segment 52. The length of the second shaft segment 52 is less than the length of the first shaft segment 51, and the second end cap 10 seals the shaft end of the second shaft segment 52. The first shaft segment 51 passes through the first end cap 7 and the plastic sealing structure 8.

[0067] In this invention, the long shaft section of the rotating shaft is supported on the first end cover by the first bearing. The first end cover is fixed to the plastic sealing machine housing and the stator core by the plastic sealing structure, which effectively improves the structural strength and support stability of the long shaft section end cover structure. The second end cover closes and seals the shaft end of the second shaft section. The first end cover, together with the plastic sealing structure, seals the long shaft section.

[0068] In some implementations...

[0069] Along the axial direction of the rotating shaft 5, the minimum distance between the first bearing 6 and the second bearing 9 is L3.

[0070] The rotor end ring 4 includes a first end ring 41 disposed at one axial end of the rotor core 2 and a second end ring 42 disposed at the other axial end of the rotor core 2. The maximum distance between the first end ring 41 and the second end ring 42 along the axial direction is L4.

[0071] And it satisfies: 1.2*L4≤L3≤1.6*L4.

[0072] The present invention further establishes a relationship between the minimum distance L3 between the first and second bearings on both sides of the rotor core that support the shaft and the maximum distance L4 between the first and second end rings at both ends of the rotor core, so that they satisfy the relationship: 1.2*L4≤L3≤1.6*L4. The combination of this parameter relationship can ensure the compactness of the shaft structure and increase the modal strength. The squirrel cage slot is cast aluminum and a closed squirrel cage structure is formed by short-circuiting through the end rings. By designing the end ring thickness and the rotor core thickness to satisfy the above relationship, the efficiency of the motor during high-speed operation is improved.

[0073] In some implementations...

[0074] Along the axial direction of the rotor core 2, the minimum axial distance between the shaft end of the second shaft segment 52 and the axial end of the rotor core 2 is L5, and the minimum axial distance between the shaft end of the first shaft segment 51 and the axial end of the rotor core 2 is L6, satisfying: 1.12*L2≤L5≤1.14*L2, 3.59*L2≤L6≤3.61*L2.

[0075] Furthermore, this invention further ensures that the minimum axial distance L5 between the second shaft segment of the rotating shaft and the rotor core shaft end, and the minimum axial distance L6 between the shaft end of the first shaft segment and the rotor core shaft end satisfy the following relationship: 1.12*L2≤L5≤1.14*L2, 3.59*L2≤L6≤3.61*L2. This allows for the reduction of motor noise while ensuring the maximum output torque of the motor.

[0076] The present invention further optimizes the relationship between L5 and L6 and the rotor core height L2: L5=1.14*L2, L6=3.61*L2. This combination can further ensure the maximum output torque of the motor while reducing motor noise.

[0077] In some implementations...

[0078] Along the axial direction of the rotor core 2, the axial thickness of the portion of the encapsulated structure 8 located between the first end cover 7 and the rotor core 2 is m3, and satisfies: m3≥1.5m.

[0079] Furthermore, by setting the axial thickness m3 of the portion of the encapsulated structure located between the first end cover and the rotor core and the radial thickness m of the first end cover to satisfy the relationship: m3≥1.5m, the present invention can further increase the end cover support strength and further improve the noise.

[0080] In some implementations...

[0081] It also includes a molding machine housing 11, a portion of which is located on the outer periphery of the stator core 1, a portion of which is located on one axial side of the stator core 1, and a portion of which is located on the other axial side of the stator core 1. The molding machine housing 11 and the molding structure 8 are integrally injection molded.

[0082] The outer diameter of the stator core 1 is D1, and the outer diameter of the plastic sealing housing 11 is D2, satisfying D2≥1.05*D1.

[0083] The present invention further utilizes the above-mentioned method of forming a circle ( Figure 3 The outer diameter D1 of the stator core (the outer diameter of the circumscribed circle of the stator core) and the outer diameter D2 of the sealing machine housing satisfy D2≥1.05*D1, which can effectively ensure the thickness of the sealing machine housing and effectively increase the strength of the stator.

[0084] In some implementations...

[0085] The first end cap 7 is injection molded as a whole with the stator core 1 through the molding structure 8 and the molding machine housing 11. The second end cap 10 is interference-fitted with the molding machine housing 11. The stator core 1 is spliced ​​into a circle by multiple stator teeth and multiple stator yokes of straight bar structure, and has multiple tooth groove structure. After being spliced ​​into a circle, an insulating skeleton 12 is fitted on it, and then the winding coil 3 is wound on the insulating skeleton 12.

[0086] The stator core of this invention is a straight bar structure spliced ​​into a circle, preferably with an 8-tooth slot structure, fitted with an insulating skeleton, and the stator core with winding coils is formed by bending and splicing straight bars to form an inner circular structure, which can optimize the magnetic circuit distribution, adopt a concentrated winding group, simplify the winding process and reduce copper loss; the rotor slots are cast aluminum, and finally a squirrel cage end ring is formed at both ends of the rotor core. The end rings at both ends of the core are short-circuited to form a squirrel cage structure.

[0087] During the assembly of the single-phase capacitor-operated asynchronous motor of the present invention, the insulating frame is tightly attached to the stator teeth and wound with a concentrated winding coil. The housing is formed by stator injection molding, which improves the motor's insulation withstand voltage, while also increasing the overall rigidity of the motor and reducing overall noise.

[0088] The rotor adopts a skewed slot structure, with an interference fit between the rotor and the shaft, improving the heat transfer efficiency of the bearings and shaft, preventing localized overheating, and simultaneously transmitting torque. The shaft has an interference fit with the front and rear end bearings, and a clearance fit with the front and rear end covers for easy disassembly. The front end cover is injection molded into the stator assembly, while the rear end cover is interference-fitted to the stator assembly.

[0089] This invention relates to a single-phase capacitor-run asynchronous motor structure. This invention solves the defects of traditional single-phase asynchronous motors, such as complex winding process, poor starting performance, high operating noise, and insufficient structural strength. It provides a capacitor-run asynchronous motor with optimized structure, high operating efficiency, and strong reliability. It can improve the speed and efficiency of single-phase capacitor-run asynchronous motor, and improve starting performance and noise, while reducing manufacturing costs.

[0090] This invention provides a stator and rotor stacking height configuration for a single-phase capacitor-operated asynchronous motor. By using a stator and rotor with unequal heights and satisfying the condition: C1*L2+K1*|L1-L2|≤H≤C2*L2+K2*|L1-L2|, leakage flux is reduced, motor starting performance is improved, and motor efficiency is increased during high-speed operation. Figure 5 As shown;

[0091] This invention provides a rotor structure for a single-phase capacitor-operated asynchronous motor. By setting the circumferential width W1 of the rotor teeth of the rotor core and the width W2 of the skew slot of the rotor slot to satisfy the relationship: 0.9W1≤W2≤1.2W1, this structure can make full use of the slot area, make the magnetic flux density of the teeth uniform, effectively reduce the cogging effect, reduce noise, solve the problem of excessive noise, and improve the motor operating performance.

[0092] This invention provides a single-phase capacitor-operated asynchronous motor. The axial thickness m1 and radial thickness m2 of the plastic encapsulation structure at the first end cover are set to satisfy the following relationship with the radial thickness m of the first end cover: m1≥2.5*m, m2≥2*m. Through the thickness design of the first end cover and the plastic encapsulation structure, the support strength can be increased and the motor noise can be further improved.

[0093] This invention provides a single-phase capacitor-operated asynchronous motor. By establishing a correlation between the minimum distance L3 between the first and second bearings supporting the rotor shaft on both sides of the rotor core and the maximum distance L4 between the first and second end rings at both ends of the rotor core, the correlation is: 1.2*L4≤L3≤1.6*L4. This parameter correlation ensures the compactness of the shaft structure and increases modal strength. The squirrel cage slot is cast aluminum and a closed squirrel cage structure is formed by short-circuiting the end rings. By designing the end ring thickness and rotor core thickness to satisfy the above relationship, the motor efficiency during high-speed operation is improved.

[0094] Figure 6 A comparison of the efficiency of the single-phase capacitor-operated asynchronous motor of the present invention with that of the prior art shows that the present invention can improve the efficiency at each speed point by about 1%-3%. Figure 7 A comparison of the total noise levels of the present invention with those of the prior art shows that the single-phase capacitor-operated asynchronous motor of the present invention can reduce the total noise level at each speed point by about 1-2 dB.

[0095] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A single-phase capacitor-driven asynchronous motor, characterized in that: include: The stator core (1), rotor core (2), and rotor end ring (4) are provided. The stator core (1) is located on the outer periphery of the rotor core (2). The rotor end ring (4) is located at the axial end of the rotor core (2). The axial height of the stator core (1) is L1, the axial height of the rotor core (2) is L2, and the axial height of the rotor end ring (4) is H. We have: L2 > L1, and satisfy: C1*L2+K1*|L1-L2|≤H≤C2*L2+K2*|L1-L2|, where 0.4≤C1≤0.6, 0.5≤C2≤0.7, 0.8≤K1≤1.0, and 0.7≤K2≤1.

1.

2. The single-phase capacitor-run asynchronous motor according to claim 1, characterized in that: 0.12L2≤H≤0.22L2.

3. The single-phase capacitor-run asynchronous motor according to claim 1, characterized in that: The rotor core (2) is formed by stacking multiple rotor laminations along its axial direction. Each rotor lamination has multiple squirrel cage slots (21). The squirrel cage slots (21) penetrate the rotor lamination along the axial direction. At the outer circumferential surface of the rotor lamination, the squirrel cage slots (21) form slot openings (22). A solid rotor tooth (23) is formed between two adjacent slot openings (22) along the circumferential direction of the rotor core lamination. The circumferential width of the rotor tooth (23) is W1. Furthermore, the slots (22) of two adjacent rotor laminations are not opposite each other along the axial direction of the rotor core (2), forming an offset. From one side of the rotor core (2) to the other side, the slots (22) of multiple rotor laminations are offset and connected in the same circumferential direction, forming rotor skew slots (24). The minimum distance between two circumferentially adjacent rotor skew slots (24) along the circumferential direction of the rotor core (2) is the skew slot width W2. And it satisfies: 0.9W1≤W2≤1.2W1.

4. The single-phase capacitor-run asynchronous motor according to claim 1, characterized in that: It also includes a rotating shaft (5), the rotor core (2) has a central shaft hole, the rotating shaft (5) passes through the central shaft hole, the rotating shaft (5) extending out of the axial end of the rotor core (2) is supported by a first bearing (6), a first end cover (7) is provided on the outer periphery and axial side of the first bearing (6), a plastic sealing structure (8) is provided on the outer periphery and axial side of the first end cover (7), such that the first end cover (7) is located between the first bearing (6) and the plastic sealing structure (8), the radial thickness of the portion of the first end cover (7) located on the outer periphery of the first bearing (6) is m, the radial thickness of the portion of the plastic sealing structure (8) located on the outer periphery of the first end cover (7) is m2, the axial thickness of the portion of the plastic sealing structure (8) located on the axial side of the first end cover (7) is m1, and satisfies m1≥2.5*m, m2≥2*m.

5. The single-phase capacitor-run asynchronous motor according to claim 4, characterized in that: The shaft (5) extending from the other axial end of the rotor core (2) is supported by a second bearing (9). A second end cap (10) is provided on the outer periphery and axial side of the second bearing (9). The shaft (5) extending from one axial end of the rotor core (2) is defined as the first shaft segment (51), and the shaft (5) extending from the other axial end of the rotor core (2) is defined as the second shaft segment (52). The length of the second shaft segment (52) is less than the length of the first shaft segment (51), and the second end cap (10) seals the shaft end of the second shaft segment (52). The first shaft segment (51) passes through the first end cap (7) and the plastic sealing structure (8).

6. The single-phase capacitor-run asynchronous motor according to claim 5, characterized in that: Along the axial direction of the rotating shaft (5), the minimum distance between the first bearing (6) and the second bearing (9) is L3. The rotor end ring (4) includes a first end ring (41) disposed at one axial end of the rotor core (2) and a second end ring (42) disposed at the other axial end of the rotor core (2), wherein the maximum distance between the first end ring (41) and the second end ring (42) along the axial direction is L4; And it satisfies: 1.2*L4≤L3≤1.6*L4.

7. The single-phase capacitor-run asynchronous motor according to claim 5, characterized in that: Along the axial direction of the rotor core (2), the minimum axial distance between the shaft end of the second shaft segment (52) and the axial end of the rotor core (2) is L5, and the minimum axial distance between the shaft end of the first shaft segment (51) and the axial end of the rotor core (2) is L6, satisfying: 1.12*L2≤L5≤1.14*L2, 3.59*L2≤L6≤3.61*L2.

8. The single-phase capacitor-run asynchronous motor according to claim 4, characterized in that: Along the axial direction of the rotor core (2), the axial thickness of the portion of the encapsulated structure (8) located between the first end cap (7) and the rotor core (2) is m3, and satisfies: m3≥1.5m.

9. The single-phase capacitor-run asynchronous motor according to claim 5, characterized in that: It also includes a molding machine housing (11), a portion of the structure of the molding machine housing (11) is located on the outer periphery of the stator core (1), a portion of the structure of the molding machine housing (11) is located on one axial side of the stator core (1), and a portion of the structure of the molding machine housing (11) is located on the other axial side of the stator core (1). The molding machine housing (11) and the molding structure (8) are integrally injection molded. The outer diameter of the stator core (1) is D1, and the outer diameter of the plastic sealer housing (11) is D2, satisfying D2≥1.05*D1.

10. The single-phase capacitor-run asynchronous motor according to claim 9, characterized in that: The first end cap (7) is injection molded into a whole with the stator core (1) through the encapsulation structure (8) and the encapsulation housing (11). The second end cap (10) is interference-fitted with the encapsulation housing (11). The stator core (1) is spliced ​​into a circle by multiple stator teeth and multiple stator yokes of straight bar structure, and has multiple tooth groove structure. After splicing into a circle, an insulating skeleton (12) is fitted, and then a winding coil (3) is wound on the insulating skeleton (12).

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