Straight stator core assembly, motor, air conditioner

Abstract

The present invention provides a straight stator core assembly, a motor, and an air conditioner. The straight stator core assembly includes a plurality of single stator cores and an insulating skeleton. The insulating skeleton has a skeleton yoke corresponding to the yoke of the single stator core. A wire slot is formed on the outer sidewall of the skeleton yoke. The tooth pitch between two adjacent single stator cores is L4. The wire slot has a first slot section on one side of the radial symmetry line s of the corresponding single stator core and a second slot section on the other side of the radial symmetry line s. The lengths of the first slot section and the second slot section in the linear extension direction of the straight stator core assembly are not equal, and the length of the longer slot section is L5, and L5 = L4 / 2. According to the present invention, the path length traveled by the bridging wire after the straight stator core assembly is formed into a circle is equal to the path length traveled by the bridging wire before the straight stator core assembly is formed into a circle, ensuring that the bridging wire will not loosen and will not be stretched too tightly, thereby ensuring the production quality of the motor.

Description

Technical Field

[0001] The present invention belongs to the technical field of motor manufacturing, and particularly relates to a straight stator core assembly, a motor, and an air conditioner. Background Art

[0002] Generally, a motor body is composed of components such as a stator, a rotor, and a housing. The stator includes a stator core, an insulating structure, and a winding, and the winding is usually enameled wire. Currently, there are mainly two forms of insulating structures used in motor stators: one is an independent single-body skeleton, and the other is a plastic-coated skeleton integrally injection-molded with the stator core. When manufacturing the stator with a single-body skeleton, it needs to be individually sleeved onto the stator core one by one, with a cumbersome process, a large number of personnel required, and low production efficiency. While the plastic-coated skeleton is integrally injection-molded on the stator core, with a simple process, few personnel required, and high production efficiency.

[0003] As Figure 1 and Figure 2 shown, the traditional skeleton is symmetrically distributed on the single-body stator core. When winding in a straight line, the length of the single-tooth crossover wire is 2*L1. After the straight stator forms a circle, the path length that the single-tooth crossover wire travels is 2*L2 + L3. It can be seen from Figure 2 this that its path length is significantly less than the length of the crossover wire, so there will be a situation of loose wire, leading to a series of quality problems. Summary of the Invention

[0004] Therefore, the present invention provides a straight stator core assembly, a motor, and an air conditioner, which can overcome the deficiency that the path length of the crossover wire after the straight stator core assembly forms a circle is less than the length of the crossover wire, resulting in loose wire and reducing the production quality of the motor in the prior art.

[0005] To solve the above problems, the present invention provides a straight stator core assembly, including a plurality of single-body stator cores and an insulating skeleton partially wrapped around the single-body stator cores. The plurality of single-body stator cores are adjacent to each other in a straight line and can form a circle to become a cylindrical stator core assembly. Define the side of the single-body stator core corresponding to the radially outer side of the cylindrical stator core assembly as the outer side, and the side corresponding to the radially inner side of the cylindrical stator core assembly as the inner side. The insulating skeleton has a skeleton yoke corresponding to the yoke of the single-body stator core. A wire passing groove is formed on the outer side wall of the skeleton yoke. When the straight stator core assembly is in a straight line state, the tooth pitch between two adjacent single-body stator cores is L4. The wire passing groove has a first groove section on one side of the radial symmetry line s of the corresponding single-body stator core and a second groove section on the other side of the radial symmetry line s. The lengths of the first groove section and the second groove section in the straight extension direction of the straight stator core assembly are not equal, and the length of the longer groove section is L5, and L5 = L4 / 2.

[0006] In some embodiments, both ends of the insulating skeleton protrude from the corresponding ends of the single-piece stator core, and the wire passing groove is formed on the outer side of one end of the insulating skeleton that protrudes from the corresponding end of the single-piece stator core; and / or, the insulating skeleton is integrally injection-molded on the single-piece stator core.

[0007] In some embodiments, the outer side of the single-piece stator core protrudes from the outer side of the insulating skeleton; and / or, the depth of the wire passing groove is k, where k = (1.5 - 2) * d, and d is the diameter of the jumper wire accommodated in the wire passing groove.

[0008] In some embodiments, the distance between the highest positions of the outer side of the single-piece stator core and the outer side of the insulating skeleton is L6, where L6 = (0.2 - 0.4) * h j , h j is the radial height of the yoke portion of the single-piece stator core.

[0009] In some embodiments, the radially inner side of the yoke portion of the single-piece stator core is a planar structure perpendicular to the tooth-boot connecting arm of the single-piece stator core.

[0010] In some embodiments, the circumferential length from one end to the other end of the skeleton yoke portion is L7, the outer radius of the cylindrical stator core assembly is R and it includes Z single-piece stator cores, the radial thickness of the skeleton yoke portion is uniform and is △i, and L7 = 2 * (R - h j - △i) * tan.

[0011] In some embodiments, the side of the tooth boot of the single-piece stator core facing the yoke portion of the single-piece stator core is a plane that forms an obtuse angle with the tooth-boot connecting arm; and / or, the length of the shorter slot section in the first slot section and the second slot section is L7 / 2.

[0012] In some embodiments, the insulating skeleton has skeleton boot portions corresponding to the tooth boots of the single-piece stator core, the skeleton boot portions are symmetrically located on both sides of the tooth-boot connecting arm respectively, and the radially extending lines at the opposite ends of the skeleton boot portions form an angle a, where a = 360° / Z - (0.2° - 0.5°).

[0013] In some embodiments, a winding groove is formed between the tooth portions of two adjacent single-piece stator cores, and the thickness of the insulating skeleton located in the winding groove is uniform.

[0014] The present invention also provides a motor, including the above-mentioned straight-bar stator core assembly that can form a circular cylindrical stator core assembly.

[0015] In some embodiments, the motor further includes a square pin. A circular blind hole extending from one end to the other end is formed on the yoke portion of the monomer stator core. A pin hole adapted to the circular blind hole is formed on the skeleton yoke portion. The square pin can be press-fitted into the circular blind hole.

[0016] The present invention also provides an air conditioner including the above-mentioned motor.

[0017] For a straight stator core assembly, a motor, and an air conditioner provided by the present invention, two slot sections of the wire passing slot are designed to have unequal lengths, and the length of the longer one of the slot sections is designed to be half of the tooth pitch of the stator core. After the straight stator core assembly is formed into a circle, the path length that the cross-connecting wire passes through is equal to the path length that the cross-connecting wire passes through before the straight stator core assembly is formed into a circle, ensuring that the cross-connecting wire will not become loose or too tight, thereby ensuring the production quality of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 FIG. 12 is a partial structural schematic diagram of a straight stator core assembly in the prior art (before forming into a circle);

[0019] Figure 2 is Figure 1 a structural schematic diagram of the straight stator core assembly in FIG. 12 after forming into a circle;

[0020] Figure 3 FIG. 22 is a partial structural schematic diagram of a straight stator core assembly according to an embodiment of the present invention (before forming into a circle);

[0021] Figure 4 is Figure 3 a schematic diagram of some relevant dimensions of several adjacent monomer stator cores and the insulating skeleton thereon in FIG. 22;

[0022] Figure 5 is Figure 3 a partial structural schematic diagram of the straight stator core assembly in FIG. 34 after forming into a circle;

[0023] Figure 6 FIG. 38 is an assembly schematic diagram (partial cross-section) of a square pin, an insulating skeleton, and a stator core in a motor according to another embodiment of the present invention;

[0024] Figure 7 is Figure 6 a top view of FIG. 44;

[0025] Figure 8 is Figure 3 a schematic diagram of some other relevant dimensions of several adjacent monomer stator cores and the insulating skeleton thereon in FIG. 50;

[0026] Figure 9 is Figure 3Schematic diagram of the relative position between the single stator core and the insulating skeleton.

[0027] The reference signs are shown as follows:

[0028] 1. Single stator core; 11. Circular blind hole; 2. Insulating skeleton; 21. Wire slot; 22. Upper skeleton; 23. Lower skeleton; 100. Square pin. Detailed implementation mode

[0029] Refer to Figures 3 to 9 As shown, according to an embodiment of the present invention, a straight stator core assembly is provided, which includes a plurality of single stator cores 1 and an insulating skeleton 2 partially wrapped on the single stator cores 1. The plurality of single stator cores 1 are adjacent along a straight line and can form a circle to become a cylindrical stator core assembly. Define the side of the single stator core 1 corresponding to the radially outer side of the cylindrical stator core assembly as the outer side, and the side corresponding to the radially inner side of the cylindrical stator core assembly as the inner side. The insulating skeleton 2 has a skeleton yoke corresponding to the yoke of the single stator core 1. A wire slot 21 is formed on the outer side wall of the skeleton yoke. When the straight stator core assembly is in a straight state, the tooth pitch between two adjacent single stator cores 1 is L4. The wire slot 21 has a first slot section on one side of the radial symmetry line s of the corresponding single stator core 1 and a second slot section on the other side of the radial symmetry line s. The lengths of the first slot section and the second slot section in the straight extension direction of the straight stator core assembly are not equal, and the length of the longer slot section is L5, and L5 = L4 / 2. In this technical solution, the two slot sections of the wire slot 21 are designed to have unequal lengths, and the length of the longer one of them is designed to be half of the tooth pitch of the stator core. The path length of the cross-connecting wire after the straight stator core assembly forms a circle is equal to the path length of the cross-connecting wire before the straight stator core assembly forms a circle, ensuring that the cross-connecting wire will not loosen and will not be too tight, thereby ensuring the production quality of the motor.

[0030] Refer to Figure 4 As shown, according to geometric principles, L4 = 2*(R - f)*tan(180° / Z), where R is the outer radius of the straight stator core assembly when it forms a circle to become a cylindrical stator core assembly, f is the radial thickness of the connection of the yoke of the single stator core 1, and Z is the number of teeth of the cylindrical stator core assembly, that is, the number of single stator cores 1 included.

[0031] In some embodiments, both ends of the insulating skeleton 2 protrude from corresponding ends of the single-piece stator core 1, and the wire passing groove 21 is formed on the outer side of one end of the insulating skeleton 2 that protrudes from the corresponding end of the single-piece stator core 1. Specifically, for example, the insulating skeleton 2 includes an upper skeleton 22 at one end of the single-piece stator core 1 and a lower skeleton 23 at the other end of the single-piece stator core 1. At this time, the wire passing groove 21 is formed on the outer side of the end of the lower skeleton 23, so that it can effectively prevent the bridging wire from coming out of the wire passing groove 21 when the straight stator core assembly is formed into a circle.

[0032] In a specific embodiment, the insulating skeleton 2 is integrally injection-molded on the single-piece stator core 1, and the straight stator core assembly can be directly used for winding enameled wire, without the cumbersome process of sleeving the insulating skeleton, improving the production efficiency of the motor.

[0033] See Figure 9 As shown, in some embodiments, the outer side of the single-piece stator core 1 protrudes from the outer side of the insulating skeleton 2. Further, the distance between the highest positions of the outer side of the single-piece stator core 1 and the outer side of the insulating skeleton 2 is L6, and L6 = (0.2 - 0.4) * h j , h j is the radial height of the yoke part of the single-piece stator core 1. On the one hand, it is convenient for the connection of the cylindrical stator core assembly with the corresponding motor housing (such as interference fit connection). On the other hand, the yoke part of the protruding (exposed) stator core can be used for clamping by the winding tooling to ensure the reliability of clamping; and / or, the groove depth of the wire passing groove 21 is k, and k = (1.5 - 2) * d, where d is the diameter of the bridging wire accommodated in the wire passing groove 21, so as to ensure that the bridging wire is completely inside the wire passing groove 21, effectively eliminating the risk of the bridging wire being exposed and scratched.

[0034] In some embodiments, the radially inner side surface of the yoke part of the single-piece stator core 1 is a planar structure perpendicular to the tooth-boot connecting arm of the single-piece stator core 1, so that the single-piece stator core 1 presents a T-shaped structure in the axial projection. On the one hand, through the design of the planar structure, no corresponding protrusion is provided, so it will not block the high-speed rotating winding nozzle, which is beneficial to improving the slot filling rate of the winding slot; on the other hand, the vertical structure of the T shape eliminates the winding blind area at the root of the stator tooth, improving the slot utilization rate of the stator. In one embodiment, the outer side plane of the single-piece stator core 1 is parallel to the planar structure.

[0035] In some embodiments, the circumferential length from one end to the other end of the yoke part of the skeleton is L7, the outer circle radius of the cylindrical stator core assembly is R and it includes Z single-piece stator cores 1, the radial thickness of the yoke part of the skeleton is uniform and is △i, and L7 = 2 * (R - hj -△i)*tan180° / Z can ensure that after the straight stator core assembly forms a circle, the circumferential ends of the skeleton yoke part in the winding slot are circumferentially continuous, effectively preventing the enameled wire from contacting the yoke part of the stator core. It should be noted that the length of the shorter slot section in the first slot section and the second slot section is L7 / 2, so that after the straight stator core assembly forms a circle, the length of the cross-over wire between the corresponding radial symmetry lines s on the insulation skeletons of two adjacent single stator cores 1 is L5 + L5 = L4, as Figure 5 shown in.

[0036] In some embodiments, the side of the tooth boot of the single stator core 1 facing the yoke part of the single stator core 1 is a plane that forms an obtuse angle (such as Figure 8 b) in the figure) with the tooth boot connecting arm, which can broaden the area of the winding slot and increase the stator winding space; no corresponding protrusion is provided on the plane, the insulation skeleton 2 has a skeleton boot part corresponding to the tooth boot of the single stator core 1, and the skeleton boot parts are symmetrically located on both sides of the tooth boot connecting arm respectively. The radially extending lines at the opposite ends of the skeleton boot part form an angle a, a = 360° / Z - (0.2° to 0.5°), which can effectively prevent the enameled wire from contacting the stator core of the tooth boot. In one embodiment, the obtuse angle is between 100° and 150°.

[0037] In some embodiments, a winding slot is formed between the tooth parts of two adjacent single stator cores 1, and the thickness of the insulation skeleton 2 in the winding slot is uniform. At this time, there is an angle c at the position of the insulation skeleton 2 corresponding to the tooth boot and the tooth boot connecting arm, and c = b.

[0038] According to an embodiment of the present invention, there is also provided a motor, including the straight stator core assembly that can form a circular cylindrical stator core assembly as described above.

[0039] In some embodiments, the motor further includes a square pin 100. A circular blind hole 11 extending from one end to the other end is formed on the yoke part of the single stator core 1. A pin hole adapted to the circular blind hole 11 is formed on the skeleton yoke part (specifically, for example, on the upper skeleton 22). The square pin 100 can be press-fitted into the circular blind hole 11. The square pin 100 can be a part of a Y capacitor or a square pin for preventing shaft current, which can realize the conduction of the Y capacitor or the end cover and the stator core, reduce the welding process, and the cooperation of the square cross-section pin and the circular blind hole 11 can reduce the assembly difficulty of the interference fit.

[0040] According to an embodiment of the present invention, there is also provided an air conditioner, including the motor as described above.

[0041] Those skilled in the art can easily understand that, on the premise of no conflict, the above-mentioned advantageous ways can be freely combined and superimposed.

[0042] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention. The above is only the preferred implementation manner of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as within the protection scope of the present invention.

Claims

1. A straight stator core assembly, comprising a plurality of single stator cores (1) and an insulating skeleton (2) partially wrapped around the single stator cores (1), wherein the plurality of single stator cores (1) are adjacently arranged in a straight line and can form a circle to become a cylindrical stator core assembly, characterized in that, Define the side of the single-piece stator core (1) corresponding to the radially outer side of the cylindrical stator core assembly as the outer side, and the side corresponding to the radially inner side of the cylindrical stator core assembly as the inner side. The insulating skeleton (2) has a skeleton yoke corresponding to the yoke of the single-piece stator core (1). A wire groove (21) is formed on the outer wall of the skeleton yoke. When the straight stator core assembly is in a straight state, the tooth pitch between two adjacent single-piece stator cores (1) is L4. The wire groove (21) has a first groove section on one side of the radial symmetry line s of the corresponding single-piece stator core (1) and a second groove section on the other side of the radial symmetry line s. The lengths of the first groove section and the second groove section in the straight extension direction of the straight stator core assembly are not equal, and the length of the longer groove section is L5, where L5 = L4 / 2. The circumferential length from one end to the other end of the skeleton yoke is L7, and the length of the shorter groove section in the first groove section and the second groove section is L7 / 2.

2. The straight stator core assembly according to claim 1, characterized in that, Both ends of the insulating skeleton (2) protrude from the corresponding ends of the single-piece stator core (1) respectively, and the wire groove (21) is formed on the outer side of one end of the insulating skeleton (2) protruding from the corresponding end of the single-piece stator core (1); and / or, the insulating skeleton (2) is integrally injection-molded on the single-piece stator core (1).

3. The straight stator core assembly according to claim 1 or 2, characterized in that, The outer side of the single-piece stator core (1) protrudes from the outer side of the insulating skeleton (2); and / or, the depth of the wire groove (21) is k, where k = (1.5 - 2) * d, and d is the diameter of the jumper wire accommodated in the wire groove (21).

4. The straight stator core assembly according to claim 3, characterized in that, The distance between the outer side of the single stator core (1) and the highest position of the outer side of the insulating skeleton (2) is L6, and L6 = (0.2 - 0.4) * h j , h j is the radial height of the yoke portion of the single stator core (1).

5. The straight stator core assembly according to claim 4, characterized in that, The radially inner side of the yoke of the single-piece stator core (1) is a planar structure perpendicular to the tooth-boot connecting arm of the single-piece stator core (1).

6. The straight stator core assembly according to claim 5, characterized in that, The outer radius of the cylindrical stator core assembly is R and it includes Z of the single stator cores (1). The radial thickness of the frame yoke is uniform and is Δi, and L7 = 2*(R - h j - Δi)*tan(180° / Z).

7. The straight stator core assembly according to claim 6, wherein, The side of the tooth boot of the single-piece stator core (1) facing the yoke of the single-piece stator core (1) is a plane forming an obtuse angle with the tooth-boot connecting arm.

8. The straight stator core assembly according to claim 7, wherein The insulating skeleton (2) has a skeleton boot corresponding to the tooth boot of the single-piece stator core (1). The skeleton boots are symmetrically located on both sides of the tooth-boot connecting arm respectively. The radially extending lines at the opposite ends of the skeleton boots form an angle a, where a = 360° / Z - (0.2° - 0.5°).

9. The straight stator core assembly according to claim 8, characterized in that, A winding groove is formed between the tooth parts of two adjacent single-piece stator cores (1), and the thickness of the insulating skeleton (2) in the winding groove is uniform.

10. A motor, characterized in that, A straight stator core assembly capable of forming a circular cylindrical stator core assembly as described in any one of claims 1 to 9.

11. The motor according to claim 10, characterized in that, It further includes a square pin (100). A circular blind hole (11) extending from one end to the other end is formed on the yoke of the single-piece stator core (1). A pin hole adapted to the circular blind hole (11) is formed on the skeleton yoke. The square pin (100) can be press-fitted into the circular blind hole (11).

12. An air conditioner, characterized in that, An electric motor as described in claim 10 or 11.

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