Spliced stator assemblies, electric motors, and compressors

Abstract

The present invention relates to the technical field of electric motors, and in particular to a spliced stator assembly, an electric motor, and a compressor. The spliced stator assembly includes a stator core and a resin skeleton. The stator core is spliced together by a plurality of stator core units, and the stator core unit extends axially and includes a yoke and a tooth portion distributed radially. The resin skeleton is spliced together by a plurality of resin skeleton units, and the resin skeleton unit includes a base and two positioning bodies arranged on the base. The surfaces of the yoke and the tooth portion facing the base are first docking surfaces. The tooth portion has two first positioning grooves formed by depressions from the first docking surface and the front end surface of the tooth front end of the tooth portion. The two positioning bodies are respectively inserted into the two first positioning grooves. The electric motor includes the above-mentioned spliced stator assembly, and the compressor includes the above-mentioned electric motor. The present invention improves the positioning effect of the resin skeleton unit on the stator core unit, thereby improving the performance of the electric motor.

Description

Technical Field

[0001] The present invention relates to the technical field of electric motors, and in particular to a spliced stator assembly, an electric motor and a compressor. Background Art

[0002] The stator core of a traditional electric motor is a monolithic structure. When winding a monolithic stator core, sufficient space must be left for the winding machine's winding needle (or outlet nozzle) to enter and exit the wire. Therefore, the stator slot opening cannot be too small, resulting in a low slot fill rate for the monolithic stator core.

[0003] A spliced stator core is currently available, which is formed by splicing together several stator core units. The spliced stator core overcomes the defects of the integral stator core, such as the difficulty in winding and the low slot fill rate.

[0004] To position the resin frame on the spliced stator core, conventional techniques typically only provide a positioning groove at locations with high magnetic density, such as the tooth root or yoke of the stator core unit. Furthermore, to reduce magnetic flux loss, the positioning groove is relatively small. This presents the following problems:

[0005] 1. The resin frame can easily lose its secure position on the spliced stator core, causing it to wobble or even fall off. Furthermore, when the resin frame is not securely positioned on the stator core, the stress from the windings can easily cause it to deform and break. The front end of the teeth can also lift, reducing the slot fill factor and, consequently, the motor's performance.

[0006] 2. Opening positioning grooves at locations with high magnetic density such as the tooth root or yoke of the stator core will hinder the flow of magnetic lines of force, thereby reducing the performance of the motor.

[0007] 3. Opening positioning grooves at locations with high magnetic density, such as the tooth root or yoke of the stator core, will increase iron loss. The higher the magnetic density, the greater the iron loss. Summary of the Invention

[0008] The object of the present invention is to provide a spliced stator assembly, a motor and a compressor to improve the positioning reliability of a resin skeleton on a stator core.

[0009] To achieve this object, the present invention adopts the following technical solutions:

[0010] A spliced stator assembly includes a stator core and a resin frame; the stator core is formed by splicing together a plurality of stator core units, the stator core unit extending axially and including a yoke and teeth distributed radially; the resin frame is formed by splicing together a plurality of resin frame units, the resin frame unit including a base and two positioning bodies provided on the base;

[0011] The surfaces of the yoke and the tooth portion facing the base body are first butt joint surfaces; the tooth portion has two first positioning grooves formed by recessing from the first butt joint surface and the front end surface of the tooth front end of the tooth portion;

[0012] The two positioning bodies are respectively inserted into the two first positioning grooves.

[0013] Preferably, in the above-mentioned spliced stator assembly, the first positioning groove is further recessed from the outer side surface of the front end of the tooth.

[0014] Preferably, in the above-mentioned spliced stator assembly, in the axial direction, the entire outer side surface of the first positioning groove from the groove opening to the groove bottom of the first positioning groove is recessed to form a stepped groove structure.

[0015] Preferably, in the above-mentioned spliced stator assembly, the axial depth of the first positioning groove is greater than or equal to 1.5 mm.

[0016] Preferably, in the above-mentioned spliced stator assembly, the radial width of the first positioning groove is greater than or equal to 1.5 mm.

[0017] Preferably, in the above-mentioned spliced stator assembly, the resin skeleton unit also includes an L-shaped buckle and a plug-in body respectively connected to one end face of the base, and the buckle and the base form a slot; the plug-in body of one resin skeleton unit is plugged into and fitted with the slot of the adjacent resin skeleton unit.

[0018] Preferably, in the above-mentioned spliced stator assembly, the yoke has a second positioning groove formed by being recessed from the first docking surface, and the resin skeleton unit further includes a positioning block provided on the base, and the positioning block is inserted into the second positioning groove.

[0019] Preferably, in the above-mentioned spliced stator assembly, the outer peripheral surface of the yoke further has an axially extending flow hole connected to the second positioning groove, and the end surface shape of the flow hole is an arc groove or a dovetail groove.

[0020] An electric motor comprises a housing, the above-mentioned spliced stator assembly installed in the housing, and a rotor installed in the housing, wherein the spliced stator assembly is arranged around the periphery of the rotor.

[0021] A compressor comprises the above-mentioned motor, a container and a compression mechanism arranged in the container for compressing a working medium, wherein the motor drives the compression mechanism.

[0022] The beneficial effects of the spliced stator assembly of the present invention are: two positioning structures are added to the stator core unit, thereby improving the positioning effect of the resin skeleton unit on the stator core unit, making it difficult for the resin skeleton unit to shake or fall off, and under the action of the stress of the winding, the resin skeleton unit is not easy to deform or break, and the front end of the teeth of the resin skeleton is not easy to curl up, thereby improving the slot fill rate and thus improving the performance of the motor.

[0023] The positions of the two newly added positioning structures on the stator core unit of the present invention are not likely to hinder the flow of magnetic lines of force and are not likely to increase iron loss, thereby ensuring the performance of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a perspective view of the assembly of the stator core unit and the resin skeleton unit according to Example 1 of the present invention;

[0025] Figure 2 yes Figure 1 A local enlarged view at position I;

[0026] Figure 3 is a three-dimensional diagram of a stator core unit according to embodiment 1 of the present invention;

[0027] Figure 4 is a perspective view of a resin skeleton unit according to Example 1 of the present invention;

[0028] Figure 5 is an end view of the stator core unit of embodiment 1 of the present invention;

[0029] Figure 6 is a three-dimensional diagram of a stator core unit according to embodiment 2 of the present invention;

[0030] Figure 7 is an end view of the stator core unit of embodiment 2 of the present invention;

[0031] Figure 8 is a perspective view of a resin skeleton unit according to Example 2 of the present invention;

[0032] Figure 9 is a three-dimensional diagram of a stator core unit according to embodiment 3 of the present invention;

[0033] Figure 10 It is a radial cross-sectional view of the stator core unit of embodiment 4 of the present invention.

[0034] The names and numbers of the attachments in the figure are as follows:

[0035] Stator core unit 10, yoke 11, second positioning groove 111, tooth portion 12, tooth front end 121, flow hole 112, front end face 1211, main body face 12111, inclined surface 12112, outer side face 1212, first positioning groove 122, first docking face 13, resin skeleton unit 20, base 21, positioning body 22, positioning block 23, buckle 24, plug-in body 25, slot 26. DETAILED DESCRIPTION

[0036] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0037] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0038] Example 1

[0039] For the convenience of description, the axial direction of this embodiment is as follows Figure 1 As shown in the H direction, the radial direction is as Figure 1 As shown in the R direction, the circumferential direction is as Figure 4 As shown in the S direction.

[0040] like Figure 1-Figure 5 As shown, this embodiment discloses a spliced stator assembly, including a stator core and a resin skeleton. The stator core is spliced together by a plurality of stator core units 10, which extend axially and include a yoke 11 and a tooth 12 distributed radially. The resin skeleton is spliced together by a plurality of resin skeleton units 20, which include a base 21 and two positioning bodies 22 arranged on the base 21. The surfaces of the yoke 11 and the tooth 12 facing the base 21 are the first docking surfaces 13. The tooth 12 has two first positioning grooves 122 formed by the first docking surface 13 and the front end surface 1211 of the tooth front end 121 of the tooth 12. The two positioning bodies 22 are respectively inserted into the two first positioning grooves 122.

[0041] The present invention adds two positioning structures to the stator core unit, thereby improving the positioning effect of the resin skeleton unit on the stator core unit, making the resin skeleton unit less likely to shake or fall off. Under the action of the stress of the winding, the resin skeleton unit is less likely to deform or break, and the front end of the teeth of the resin skeleton is less likely to curl up, thereby improving the slot fill rate and thus improving the performance of the motor.

[0042] The positions of the two newly added positioning structures on the stator core unit of the present invention are not likely to hinder the flow of magnetic lines of force and are not likely to increase iron loss, thereby ensuring the performance of the motor.

[0043] In addition, the teeth 12 of the stator core unit 10 of this embodiment are winding portions except for the tooth front ends 121. This embodiment increases the contact area between the stator core unit 10 and the resin skeleton unit 20, which is beneficial for increasing the creepage distance.

[0044] Preferably, the first positioning groove 122 is further recessed axially from a portion of the outer side surface 1212 of the tooth front end 121 between the notch and the bottom of the first positioning groove 122, forming a groove structure. This structure is fabricated by removing a portion of the tooth front end 121 to form the first positioning groove 122. After the first positioning groove 122 is formed, the radial thickness of the tooth front end 121 is greater than or equal to 1 mm, thereby reducing the risk of scratching the winding wire. If the radial thickness of the tooth front end 121 after the first positioning groove 122 is formed is less than 1 mm, the structure of Example 2 is adopted.

[0045] Preferably, the axial depth of the first positioning groove 122 is greater than or equal to 1.5 mm. Further preferably, the axial depth of the first positioning groove 122 is 2 mm. Preferably, the radial width of the first positioning groove 122 is greater than or equal to 1.5 mm, which is conducive to ensuring the performance of the motor and good positioning effect.

[0046] Preferably, the resin skeleton unit 20 further includes an L-shaped buckle 24 and an inserting body 25 respectively connected to one end face of the base 21, and the buckle 24 and the base 21 form a slot 26. The inserting body 25 of one resin skeleton unit 20 is plugged into and matched with the slot 26 of the adjacent resin skeleton unit 20. The splicing structure between adjacent resin skeleton units 20 in this embodiment is simple and the splicing is relatively convenient. Specifically, the buckle 24, the inserting body 25 and the positioning block 23 described below are distributed at the same end of the base 21. The positioning body 22 is located at the other end of the base 21.

[0047] Preferably, the yoke 11 has a second positioning groove 111 recessed from the first mating surface 13. The resin skeleton unit 20 also includes a positioning block 23 disposed on the base 21, which is inserted into the second positioning groove 111. Thus, each stator core unit 10 and each resin skeleton unit 20 form three positioning structures: the positioning block 23 inserted into the second positioning groove 111, and the positioning cooperation between the two positioning bodies 22 and the tooth front ends 121. In this embodiment, each resin skeleton unit 20 can be reliably positioned on each stator core unit 10.

[0048] Preferably, the outer peripheral surface of the yoke 11 further has an axially extending through hole 112 communicating with the second positioning groove 111 , and the end surface of the through hole 112 is in the shape of a circular arc groove.

[0049] This embodiment further provides an electric motor, which includes a housing, the above-mentioned spliced stator assembly installed in the housing, and a rotor installed in the housing, wherein the spliced stator assembly is arranged around the periphery of the rotor.

[0050] This embodiment also provides a compressor, which includes the above-mentioned motor, a container, and a compression mechanism arranged in the container for compressing the working medium, and the motor drives the compression mechanism.

[0051] Example 2

[0052] The structure of the first positioning groove 122 of this embodiment is slightly different from that of the embodiment. Figure 6-Figure 8 As shown, in the axial direction, the entire outer side surface 1212 of the first positioning groove 122, from the notch to the bottom of the first positioning groove 122, is recessed, forming a stepped groove structure. The structure of the first positioning groove 122 of this embodiment is less likely to scratch the windings, thereby ensuring the performance of the motor. Accordingly, the structure of the positioning body 22 of this embodiment is also different from that of the positioning body 22 of Example 1.

[0053] Example 3

[0054] like Figure 9 As shown, this embodiment is substantially the same as the first embodiment, except that the end surface of the through-hole 112 in the first embodiment is shaped like a circular arc groove, while the end surface of the through-hole 112 in this embodiment is shaped like a dovetail groove. The dovetail groove shape of the through-hole 112 in this embodiment can securely fix the tooling and improve workability.

[0055] Example 4

[0056] like Figure 10 As shown, this embodiment is basically the same as embodiment 1, except that:

[0057] The front end surface 1211 of embodiment 1 is a complete curved surface. The front end surface 1211 of this embodiment includes a main body surface 12111 located in the middle and inclined surfaces 12112 distributed on both sides of the main body surface 12111. The main body surface 12111 is a curved surface.

[0058] The inclined surface 12112 and the main surface 12111 are both axially extended, and the inclined surface 12112 forms a negative structure. That is, the first positioning groove 122 of this embodiment is formed on the stator core unit 10 having a negative structure.

[0059] Specifically, the first positioning groove 122 is formed by being recessed from the first abutting surface 13 and the inclined surface 12112 of the tooth front end 121 of the tooth portion 12 .

[0060] This embodiment utilizes the existing pole-cutting structure on the stator core unit 10, namely the two inclined surfaces 12112, so that there is no need to process two additional inclined surfaces 12112, which is beneficial to reducing costs. The beneficial effects of pole-cutting are specifically analyzed as follows:

[0061] In electric motors, the gap between the front end face 1211 of the tooth tip 121 and the outer circumference of the rotor core is typically set very small. Due to the winding stress of the stator winding, the tooth tip 121 deforms on both sides of the circumference, and there is a risk that the gap between the end face of the tooth tip 121 and the outer circumference of the rotor core will decrease. Due to the vibration of the rotor core caused by the unilateral support of the rotating shaft and the winding stress of the stator winding, there is a risk that the end face of the tooth tip 121 and the outer circumference of the rotor core will contact each other, which can seriously cause the motor to burn out.

[0062] The pole-chopping structure of this embodiment reduces the risk of contact between the front end surface 1211 of the tooth front end 121 and the outer circumference of the rotor core, thereby reducing the possibility of motor burnout. It also suppresses higher-order waves of the induced voltage, reduces torque ripple, and effectively suppresses noise and vibration in the motor.

[0063] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A spliced stator assembly, characterized in that: The invention comprises a stator core and a resin frame; the stator core is formed by splicing together a plurality of stator core units (10); the stator core unit (10) extends axially and comprises a yoke portion (11) and a tooth portion (12) distributed radially; the resin frame is formed by splicing together a plurality of resin frame units (20); the resin frame unit (20) comprises a base (21) and two positioning bodies (22) arranged on the base (21); The surfaces of the yoke (11) and the tooth portion (12) facing the base (21) are first docking surfaces (13); the tooth portion (12) has two first positioning grooves (122) formed by recessing from the first docking surface (13) and the front end surface (1211) of the tooth front end (121) of the tooth portion (12); The two positioning bodies (22) are respectively inserted into the two first positioning grooves (122); The first positioning groove (122) is also recessed from the outer side surface (1212) of the tooth front end (121); The resin skeleton unit (20) further comprises an L-shaped buckle (24) and an inserting body (25) respectively connected to one end surface of the base (21), and the buckle (24) and the base (21) form a slot (26).

2. The spliced stator assembly according to claim 1, characterized in that: In the axial direction, the entire outer side surface (1212) of the first positioning groove (122) from the groove opening to the groove bottom of the first positioning groove (122) is recessed to form a stepped groove structure.

3. The spliced stator assembly according to claim 1, characterized in that: The axial depth of the first positioning groove (122) is greater than or equal to 1.5 mm.

4. The spliced stator assembly according to claim 3, characterized in that: The radial width of the first positioning groove (122) is greater than or equal to 1.5 mm.

5. The spliced stator assembly according to claim 1, characterized in that: The plug-in body (25) of one resin skeleton unit (20) is plug-fitted into the slot (26) of an adjacent resin skeleton unit (20).

6. The spliced stator assembly according to claim 1, characterized in that: The yoke (11) has a second positioning groove (111) formed by being recessed from the first docking surface (13), and the resin skeleton unit (20) further comprises a positioning block (23) provided on the base (21), and the positioning block (23) is inserted into the second positioning groove (111).

7. The spliced stator assembly according to claim 6, characterized in that: The outer peripheral surface of the yoke (11) further comprises an axially extending through-hole (112) in communication with the second positioning groove (111); the end surface of the through-hole (112) is in the shape of a circular arc groove or a dovetail groove.

8. An electric motor, characterized in that: The invention comprises a housing, a spliced stator assembly according to any one of claims 1 to 7 installed in the housing, and a rotor installed in the housing, wherein the spliced stator assembly is arranged around the periphery of the rotor.

9. A compressor, characterized in that: It comprises the motor according to claim 8, a container and a compression mechanism arranged in the container for compressing the working medium, and the motor drives the compression mechanism.

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