Split stator assembly, motor and compressor

Abstract

The present invention relates to the technical field of electric motors, and discloses 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 unit extends axially and includes a yoke portion and a tooth portion that are radially distributed. The resin skeleton unit includes a base body and two positioning bodies provided on the base body. The surface of the stator core unit facing the base body is a first docking surface. The end surface of the tooth front end of the tooth portion includes a main body surface and two inclined surfaces distributed on both circumferential sides of the main body surface. The positioning body includes a first positioning portion and a second positioning portion that are connected and extend along different directions. The first positioning portion is in limiting cooperation with the first docking surface, and the second positioning portion is in limiting cooperation with the inclined surface. The electric motor includes the above-mentioned spliced stator assembly. 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, and the two newly added positioning structures are not likely to impede the flow of magnetic lines of force and are not likely to increase iron loss.

Description

Technical Field

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

[0002] The stator core of a traditional electric motor is integral. When winding the integral stator core, sufficient space for the winding needle (wire outlet nozzle) of the winding machine to enter and exit must be reserved, so the notch of the stator slot cannot be too small, resulting in a low slot fill factor of the integral stator core.

[0003] There has now emerged a spliced stator core, which is composed of several stator core units spliced together. The spliced stator core overcomes the defects of difficult winding and low slot fill factor of the integral stator core.

[0004] In order to realize the positioning of the resin skeleton on the spliced stator core, according to the prior art, usually only a positioning groove is opened at a position with high magnetic density such as the tooth root or yoke of the stator core unit, and in order to reduce the loss of magnetic flux, the size of the positioning groove is small. The existing problems are as follows:

[0005] 1. It is easy to cause the resin skeleton to be unable to be reliably positioned on the spliced stator core, and then shake or even fall off. In addition, when the resin skeleton cannot be reliably positioned on the stator core, under the action of the winding stress, the resin skeleton is prone to deformation and damage, and the front end of the tooth of the resin skeleton is prone to warping, reducing the slot fill factor and thus reducing the performance of the electric motor.

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

[0007] 3. Opening a positioning groove at a position with high magnetic density such as the tooth root or yoke of the stator core results in an increase in iron loss, and the greater the magnetic density at the position where the positioning groove is opened, the greater the iron loss. Summary of the Invention

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

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

[0010] A spliced stator assembly includes a stator core and a resin skeleton; the stator core is composed of several stator core units spliced together, the stator core units extend axially and include a radially distributed yoke and teeth; the resin skeleton is composed of several resin skeleton units spliced together, and the resin skeleton units include a matrix and two positioning bodies arranged on the matrix.

[0011] The surface of the stator core unit facing the base is the first docking surface; the end face of the front end of the tooth of the tooth part includes a main surface and two inclined surfaces distributed on both circumferential sides of the main surface; the positioning body includes a first positioning part and a second positioning part that are connected and extend in different directions;

[0012] The first positioning part is in limit fit with the first docking surface, and the second positioning part is in limit fit with the inclined surface.

[0013] Preferably, in the above-mentioned spliced stator assembly, the inclined surface axially extends to the entire end face of the front end of the tooth.

[0014] Preferably, in the above-mentioned spliced stator assembly, the outer end of the inclined surface in the circumferential direction inclines towards the yoke part.

[0015] Preferably, in the above-mentioned spliced stator assembly, the radial thickness and the axial thickness of the second positioning part are both greater than or equal to 1.5 mm.

[0016] Preferably, in the above-mentioned spliced stator assembly, the resin skeleton unit further includes an L-shaped buckle and a plug-in body respectively connected to one end face of the base, the buckle and the base enclose a slot; the plug-in body of one resin skeleton unit is in plug-in fit with the slot of the adjacent resin skeleton unit.

[0017] Preferably, in the above-mentioned spliced stator assembly, the two positioning bodies are symmetrically connected to two side faces in the circumferential direction of the base.

[0018] Preferably, in the above-mentioned spliced stator assembly, the yoke part has a positioning groove formed by recessing from the first docking surface and the outer peripheral surface of the yoke part, and the resin skeleton unit further includes a positioning block arranged on the base, and the positioning block is inserted into the positioning groove.

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

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

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

[0022] The beneficial effects of the spliced stator assembly of the present invention are as follows: 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. Under the action of the winding stress, the resin skeleton unit is not easily deformed or damaged, and the front end of the teeth of the resin skeleton is not easily warped, improving the slot fill factor and thus 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 impede the flow of magnetic lines of force and are not likely to increase iron loss, thus ensuring the performance of the motor.

[0024] The present invention also utilizes the pole-cutting structure on the original stator core unit, so there is no need to additionally process two inclined surfaces, which is beneficial for cost reduction.

[0025] Brief Description of the Drawings Brief Description of the Drawings

[0026] Figure 1 is an assembled three-dimensional view of the stator core unit and the resin skeleton unit in Embodiment 1 of the present invention;

[0027] Figure 2 is a three-dimensional view of the resin skeleton unit in Embodiment 1 of the present invention;

[0028] Figure 3 is an end view of the stator core unit in Embodiment 1 of the present invention;

[0029] Figure 4 is an assembled three-dimensional view of the stator core unit and the resin skeleton unit in Embodiment 2 of the present invention.

[0030] The names and reference numerals of the accessories in the figure are as follows:

[0031] Stator core unit 10, yoke 11, positioning groove 111, current-carrying hole 112, tooth part 12, tooth front end 121, main body surface 1211, inclined surface 1212, first docking surface 13, resin skeleton unit 20, base body 21, second docking surface 211, positioning body 22, first positioning part 221, second positioning part 222, positioning block 23, buckle 24, plug-in body 25, slot 26. Detailed Description of the Invention

[0032] The present invention will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Additionally, it should be noted that for the sake of description, only the parts related to the present invention rather than all the structures are shown in the drawings.

[0033] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] Embodiment 1

[0035] For the convenience of description, in this application, the axial direction is as shown by the H direction in Figure 2 and the circumferential direction is as shown by the S direction in Figure 2 and the radial direction is as shown by the R direction in Figure 2 .

[0036] This embodiment discloses a motor, which includes a housing, a spliced stator assembly installed in the housing, and a rotor installed in the housing. The spliced stator assembly is arranged around the periphery of the rotor.

[0037] Figure 1 is an assembled three-dimensional view of the stator core unit 10 and the resin skeleton unit 20 of the embodiment of the present invention.

[0038] As Figure 1 shown, this embodiment discloses a spliced stator assembly, which includes a stator core and a resin skeleton. The stator core is spliced by a plurality of stator core units 10. The stator core unit 10 extends axially and includes a yoke portion 11 and a tooth portion 12 distributed radially. The resin skeleton is spliced by a plurality of resin skeleton units 20. The resin skeleton unit 20 includes a matrix 21 and two positioning bodies 22 arranged on the matrix 21. The surface of the stator core unit 10 facing the matrix 21 is the first docking surface 13. The end surface of the tooth front end 121 of the tooth portion 12 includes a main surface 1211 and two inclined surfaces 1212 distributed on both circumferential sides of the main surface 1211. The positioning body 22 includes a first positioning portion 221 and a second positioning portion 222 that are connected and extend along different directions. The first positioning portion 221 is in limit fit with the first docking surface 13, and the second positioning portion 222 is in limit fit with the inclined surface 1212.

[0039] Two positioning structures are added to the spliced stator assembly of this embodiment on the stator core unit 10, thereby improving the positioning effect of the resin skeleton unit 20 on the stator core unit 10, making it difficult for the resin skeleton unit 20 to shake and fall off. Under the action of the winding stress, the resin skeleton unit 20 is not easy to deform and break, and the tooth front end of the resin skeleton is not easy to warp, improving the slot filling rate, and thus improving the performance of the motor.

[0040] The positions of the two newly added positioning structures on the stator core unit 10 in this embodiment are not likely to obstruct the flow of magnetic lines of force and are not likely to increase iron loss, thus ensuring the performance of the motor.

[0041] In addition, the part of the tooth portion 12 of the stator core unit 10 in this embodiment except for the tooth front end 121 is a winding portion. After the first positioning portion 221 of this embodiment is in limit fit with the first docking surface 13 and the second positioning portion 222 is in limit fit with the inclined surface 1212, the bonding area at the connection between the stator core unit 10 and the resin skeleton unit 20 is increased, which is beneficial to increasing the creepage distance.

[0042] As Figure 1 and Figure 3 shown, preferably, the inclined surface 1212 axially extends to the entire end face of the tooth front end 121. The outer end in the circumferential direction of the inclined surface 1212 inclines towards the yoke portion 11, forming a pole-chamfering structure.

[0043] This embodiment utilizes the two inclined surfaces 1212 of the pole-chamfering structure on the original stator core unit 10, so there is no need to additionally process the two inclined surfaces 1212, which is beneficial to reducing costs. The specific analysis of the beneficial effects of pole-chamfering is as follows:

[0044] In a motor, the gap between the end face of the tooth front end 121 and the outer peripheral surface of the rotor core is usually set very small. Due to the winding stress of the stator winding, deformation may occur on both circumferential sides of the tooth front end 121, and there is a risk that the gap between the end face of the tooth front end 121 and the outer peripheral surface of the rotor core may become smaller. 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 front end 121 and the outer peripheral surface of the rotor core may touch each other, which may seriously cause the motor to burn out.

[0045] In summary, the pole-chamfering structure can reduce the risk of the end face of the tooth front end 121 touching the outer peripheral surface of the rotor core and reduce the possibility of the motor burning out. It can also suppress the higher harmonics of the induced voltage, reduce the torque ripple, and effectively suppress the noise and vibration of the motor.

[0046] Preferably, both the radial thickness and the axial thickness of the second positioning portion 222 are greater than or equal to 1.5 mm. For example, the radial thickness of the second positioning portion 222 is 2 mm, 3 mm, etc. The axial thickness of the second positioning portion 222 is 1.8 mm, 2.2 mm, etc. Preferably, the axial thickness of the second positioning portion 222 is 2 mm.

[0047] Preferably, the resin skeleton unit 20 further includes an L-shaped buckle 24 and a plug-in body 25 respectively connected to one end face of the base body 21. The buckle 24 and the base body 21 enclose a slot 26. The plug-in body 25 of one resin skeleton unit 20 is plugged 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 plug-in body 25 and the positioning block 23 described below are distributed on the same end of the base body 21. The positioning body 22 is located at the other end of the base body 21.

[0048] Preferably, the two positioning bodies 22 are symmetrically connected to two side faces in the circumferential direction of the base body 21, which is beneficial to reducing the occupied space.

[0049] Preferably, the yoke portion 11 has a positioning groove 111 formed by recessing from the first docking surface 13 and the outer peripheral surface of the yoke portion 11. The resin skeleton unit 20 further includes a positioning block 23 provided on the base body 21, and the positioning block 23 is plugged into the positioning groove 111. Thus, each stator core unit 10 and each resin skeleton unit 20 together form three positioning structures, namely: the positioning block 23 is plugged into the positioning groove 111, and the two positioning bodies 22 are in positioning cooperation with the front end 121 of the tooth. Each resin skeleton unit 20 in this embodiment can be reliably positioned on each stator core unit 10.

[0050] Preferably, the outer peripheral surface of the yoke portion 11 further has a flow-through hole 112 extending axially and communicating with the positioning groove 111, and the end face shape of the flow-through hole 112 is an arc groove shape or a dovetail groove shape.

[0051] This embodiment also provides a compressor, which includes the above-mentioned motor, container and a compression mechanism arranged in the container for compressing the working medium, and the motor drives the compression mechanism.

[0052] Embodiment 2

[0053] Figure 4 is an assembled three-dimensional view of the stator core unit 10 and the resin skeleton unit 20 in Embodiment 2 of the present invention. As Figure 4 shown, the difference between this embodiment and Embodiment 1 is that: the end face shape of the flow-through hole 112 in Embodiment 1 is an arc groove shape, while the end face shape of the flow-through hole 112 in this embodiment is a dovetail groove shape. The flow-through hole 112 in this embodiment is set to a dovetail groove shape, which can stably fix the tooling and improve the workability.

[0054] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A spliced stator assembly, characterized in that, It includes a stator core and a resin skeleton; the stator core is formed by splicing a plurality of stator core units (10), the stator core units (10) extend axially and include a yoke portion (11) and a tooth portion (12) distributed radially; the resin skeleton is formed by splicing a plurality of resin skeleton units (20), and the resin skeleton units (20) include a matrix (21) and two positioning bodies (22) arranged on the matrix (21); The surface of the stator core unit (10) facing the matrix (21) is a first docking surface (13); the end surface of the tooth front end (121) of the tooth portion (12) includes a main body surface (1211) and two inclined surfaces (1212) distributed on both circumferential sides of the main body surface (1211); the positioning body (22) includes a first positioning portion (221) and a second positioning portion (222) which are connected and extend along different directions; The first positioning portion (221) is in limiting cooperation with the first docking surface (13), and the second positioning portion (222) is in limiting cooperation with the inclined surface (1212); The inclined surface (1212) extends axially to the entire end surface of the tooth front end (121); The outer end of the inclined surface (1212) in the circumferential direction inclines towards the yoke portion (11).

2. The spliced stator assembly according to claim 1, characterized in that The radial thickness and the axial thickness of the second positioning portion (222) are both greater than or equal to 1.5 mm.

3. The spliced stator assembly according to claim 1, characterized in that, The resin skeleton unit (20) further includes an L-shaped buckle (24) and a plug-in body (25) respectively connected to one end surface of the matrix (21), and the buckle (24) and the matrix (21) enclose a slot (26); the plug-in body (25) of one resin skeleton unit (20) is in plug-in cooperation with the slot (26) of the adjacent resin skeleton unit (20).

4. The spliced stator assembly according to claim 1, wherein, The two positioning bodies (22) are symmetrically connected to two circumferential side surfaces of the matrix (21).

5. The spliced stator assembly according to claim 1, wherein, The yoke portion (11) has a positioning groove (111) formed by recessing from the first docking surface (13) and the outer peripheral surface of the yoke portion (11), and the resin skeleton unit (20) further includes a positioning block (23) arranged on the matrix (21), and the positioning block (23) is inserted into the positioning groove (111).

6. The spliced stator assembly according to claim 5, wherein The outer peripheral surface of the yoke portion (11) further has a through-flow hole (112) extending axially and communicating with the positioning groove (111), and the end surface shape of the through-flow hole (112) is an arc groove shape or a dovetail groove shape.

7. A motor, characterized in that, It includes a housing, the spliced stator assembly according to any one of claims 1-6 installed in the housing, and a rotor installed in the housing, and the spliced stator assembly is annularly arranged around the periphery of the rotor.

8. A compressor, characterized in that, It includes the motor according to claim 7, a container, and a compression mechanism arranged in the container for compressing a working medium, and the motor drives the compression mechanism.

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