A stator assembly, a motor and a manufacturing method

Abstract

The present invention provides a stator assembly, a motor and a manufacturing method. The stator assembly includes a tooth core and a yoke core. The tooth core is formed by injection molding a plurality of tooth core units arranged circumferentially together; the yoke core includes a plurality of yoke core units, and the yoke core units are arranged at intervals in the circumferential direction from the tooth core units; the assembly process of the stator is optimized, and the stability of the stator is improved; the welding and fixing process is omitted, and the production cost is saved; the assembly efficiency of the stator is improved, and the problem of large loss of the stator core caused by welding is avoided; the skeleton is coated on the outer side of the root and the outer side of one end of the neck close to the root, simplifying the structure and processing technology of the skeleton and improving the electrical insulation effect; the rotor assembly is arranged in the first installation cavity, and the first end cover and the second end cover are respectively arranged at both ends of the first housing, ensuring reliable and stable connection between the stator assembly and the rotor assembly.

Description

Technical Field

[0001] The present invention belongs to the technical field of motors, and particularly relates to a stator assembly, a motor and a manufacturing method thereof. Background Art

[0002] With the development and popularization of electrical appliances, users put forward higher requirements for the performance of motors; the stator of the existing motor includes a yoke core and a plurality of tooth cores formed separately. The yoke core is a ring structure. The plurality of tooth cores are first coated with a plastic skeleton and then respectively arranged on the yoke core and fixed by welding, resulting in complex assembly process and poor stability of the stator. Summary of the Invention

[0003] In view of this, the present invention provides a stator assembly, a motor and a manufacturing method thereof to solve the problems of complex assembly process and poor stability of the stator in the prior art.

[0004] The present invention provides a stator assembly, including a tooth core, which is formed by injection molding a plurality of tooth core units arranged along the circumferential direction together.

[0005] Further optionally, two adjacent tooth core units are connected by a first limiting structure.

[0006] Further optionally, the tooth core unit includes a root, and the root forms a first limiting groove and a second limiting groove arranged oppositely;

[0007] The stator assembly includes a plurality of limiting members, and the limiting members are formed with a first limiting platform and a second limiting platform arranged oppositely;

[0008] A limiting member is arranged between two adjacent roots, the second limiting groove of one root is matched with the first limiting platform of the limiting member, and the first limiting groove of the other root is matched with the second limiting platform of the limiting member, thereby realizing the connection of two adjacent tooth core units.

[0009] Further optionally, the tooth core unit further includes a neck connected to the root; the stator assembly further includes a skeleton, and the skeleton is formed by injecting plastic sealing material into an injection molding space, and the injection molding space is surrounded by the outside of the root and the outside of one end of the neck close to the root.

[0010] Further optionally, the skeleton includes a first shell and a plurality of second shells. The first shell surrounds the outside of the root, and each second shell surrounds the outside of one end of the corresponding neck close to the root, and the plurality of second shells are arranged on the outer peripheral surface of the first shell along the circumferential direction of the first shell.

[0011] Further optionally, the skeleton further includes a plurality of baffles, each baffle is disposed on the corresponding second housing and away from the first housing; a winding slot is formed between the baffle and the first housing for winding a winding.

[0012] Further optionally, the first housing is formed with a wire slot and a wire passing hole, the wire passing hole is communicated with the wire slot, and two wire passing holes are correspondingly arranged for each winding slot; the jumper wire of the winding enters the wire slot through one wire passing hole and exits through the other wire passing hole.

[0013] Further optionally, the stator assembly further includes a plurality of yoke core units; the yoke core units and the tooth core units are arranged at intervals in the circumferential direction, and the two are connected by a second limiting structure.

[0014] Further optionally, the neck is formed with a third limiting slot and a fourth limiting slot arranged oppositely; the yoke core unit is formed with a third limiting platform and a fourth limiting platform arranged oppositely;

[0015] One yoke core unit is disposed between two adjacent necks, the third limiting platform of the yoke core unit is matched with the fourth limiting slot of one neck, and the fourth limiting platform of the yoke core unit is matched with the third limiting slot of the other neck, thereby realizing the connection between one yoke core unit and two necks.

[0016] The present invention further provides a motor, the motor includes a rotor assembly, a first end cover, a second end cover and the stator assembly according to any one of the above; the first housing of the stator assembly is formed with a first shaft hole and encloses a first installation cavity, the rotor assembly is disposed in the first installation cavity and includes a rotor shaft; the first end cover is disposed at one end of the first housing, and one end of the rotor shaft passes through the first shaft hole and extends to the first end cover; the second end cover is disposed at the other end of the first housing and is formed with a second shaft hole, and the other end of the rotor passes through the second shaft hole and extends outside the first installation cavity.

[0017] The present invention further provides a manufacturing method of the motor as described above, the manufacturing method includes:

[0018] Arranging a plurality of the processed tooth core units in a first injection mold in the circumferential direction, and injecting injection molding material into the first injection mold to form the tooth core.

[0019] Further optionally, the manufacturing method further includes:

[0020] Placing the tooth core in a second injection mold, and injecting injection molding material into the second injection mold to form the skeleton.

[0021] Further optionally, the manufacturing method further includes:

[0022] Winding the tooth core by a winding machine;

[0023] Providing a yoke core unit between two adjacent necks.

[0024] Further optionally, the manufacturing method includes:

[0025] Setting the first end cover at one end of the first housing;

[0026] Setting the rotor assembly in the first installation cavity;

[0027] Setting the second end cover at one end of the first housing and connecting it to the yoke core unit;

[0028] Setting the assembled stator assembly, rotor assembly, first end cover and second end cover as a whole in a third injection mold, and injecting injection molding material into the third injection mold to form a fully plastic-sealed motor.

[0029] Compared with the prior art, the beneficial effects of the present invention mainly lie in:

[0030] (1) Injecting multiple tooth core units together to form a tooth core, optimizing the assembly process of the stator, improving the stability of the tooth core and the stator; eliminating the welding and fixing process, saving production costs;

[0031] (2) Injecting the plastic-sealing material into the injection space to form a skeleton, simplifying the structure and processing technology of the skeleton, improving the electrical insulation effect; providing a yoke core unit between two adjacent necks, and the neck and the yoke core unit are detachably connected; eliminating the welding and fixing process, saving production costs; improving the assembly efficiency of the stator, avoiding the problem of large loss of the stator core caused by welding;

[0032] (3) The rotor assembly is arranged in the first installation cavity, the first end cover is detachably arranged at one end of the first housing, and the second end cover is arranged at the other end of the first housing and is detachably connected to the yoke core unit; ensuring reliable and stable connection between the stator assembly and the rotor assembly;

[0033] (4) The stator assembly, rotor assembly, first end cover and second end cover are integrally injection-molded together to form a fully plastic-sealed motor, improving the production process of the motor, canceling the use of rubber sealing rings, improving the protection level and safety factor of the motor, reducing the influence of the environment on the use of the motor, reducing the materials required for producing the motor, and improving the qualified rate of the motor; solving the problem of assembly gap existing after the stator is assembled with the front end cover or the rear end cover. Description of the Drawings

[0034] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are merely exemplary, and for those of ordinary skill in the art, without creative efforts, other implementation drawings can also be derived according to the provided drawings.

[0035] The structures, ratios, sizes, etc. shown in this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Therefore, they do not have substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope that can be covered by the technical content disclosed by the present invention.

[0036] Figure 1a Schematic structural diagram of the limiting member embodiment provided by the present invention;

[0037] Figure 1b Schematic structural diagram of the tooth core unit embodiment provided by the present invention;

[0038] Figure 1c Schematic structural diagram of the tooth core embodiment provided by the present invention;

[0039] Figure 2a Schematic structural diagram of the skeleton embodiment provided by the present invention;

[0040] Figure 2b Schematic structural diagram of the embodiment in which the skeleton and the tooth core are assembled together (without windings) provided by the present invention;

[0041] Figure 2c Schematic structural diagram of the embodiment in which the skeleton and the tooth core are assembled together (with windings) provided by the present invention;

[0042] Figure 2d Schematic structural diagram of the embodiment in which the skeleton and the tooth core are assembled together (with windings and rotor components) provided by the present invention;

[0043] Figure 3a Schematic structural diagram of the first end cover embodiment provided by the present invention;

[0044] Figure 3b Schematic structural diagram of the embodiment in which the skeleton, the tooth core and the first end cover are assembled together provided by the present invention;

[0045] Figure 3c Schematic structural diagram of the second end cover embodiment provided by the present invention;

[0046] Figure 4aSchematic structural diagram of an embodiment of the yoke core unit provided by the present invention;

[0047] Figure 4b Schematic structural diagram of an embodiment in which the skeleton, tooth core, and yoke core of the present invention are assembled together (with a winding and a rotor assembly);

[0048] Figure 5a and Figure 5b Schematic structural diagram of an embodiment in which the stator assembly, rotor assembly, first end cover, and second end cover of the present invention are assembled together;

[0049] Figure 6a and Figure 6b Schematic structural diagram of an embodiment of the injection molded housing provided by the present invention;

[0050] Figure 7a 、 Figure 7b and Figure 7c Schematic structural diagram of an embodiment of the fully plastic encapsulated motor provided by the present invention;

[0051] Figure 8 Schematic flow diagram of an embodiment of the manufacturing method of the motor provided by the present invention;

[0052] In the figure:

[0053] 11 - Tooth core unit; 111 - Root; 1111 - First limiting groove; 1112 - Second limiting groove; 112 - Neck; 1121 - Third limiting groove; 1122 - Fourth limiting groove; 12 - Limiting member; 121 - First limiting platform; 122 - Second limiting platform; 13 - Yoke core unit; 131 - Third limiting platform; 132 - Fourth limiting platform; 133 - Card slot;

[0054] 2 - Skeleton; 21 - First housing; 211 - Wire passing groove; 212 - Wire passing hole; 213 - First shaft hole; 214 - First installation cavity; 215 - Positioning groove; 2151 - Second threaded hole; 22 - Second housing; 23 - Baffle; 231 - Wiring pin;

[0055] 3 - Winding; 4 - Rotor assembly; 41 - Rotor shaft;

[0056] 51 - First end cover; 511 - First side wall; 5111 - First groove; 512 - First installation part; 5121 - Positioning protrusion; 5122 - First threaded hole;

[0057] 52 - Second end cover; 521 - Second side wall; 5211 - Second groove; 522 - Second installation part; 5221 - Positioning buckle; 523 - Second shaft hole;

[0058] 6 - Injection - molded housing; 61 - Third side wall; 611 - Bolt hole; 62 - Bottom wall; 621 - First side wall hole; 63 - Top wall; 631 - Second side wall hole; 64 - Second installation cavity;

[0059] 71 - First bearing; 72 - Second bearing. Detailed implementation manners

[0060] The following specific embodiments illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0061] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "the" and "said" used in the embodiments of the present invention and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. "Plural" generally includes at least two, but does not exclude the case of including at least one.

[0062] It should be understood that the term " / and" used herein is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0063] It should also be noted that the term "comprising", "including" or any other variant thereof is intended to cover non - exclusive inclusion, so that a commodity or system including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such a commodity or system. Without further limitation, the element defined by the statement "including one..." does not exclude the existence of another identical element in the commodity or system including the said element.

[0064] The stator of the existing motor includes a separately - formed yoke core and a plurality of tooth cores. The yoke core is of an annular structure. The plurality of tooth cores are first coated with a plastic skeleton and then respectively arranged on the yoke core and fixed by welding, resulting in a complex assembly process and poor stability of the stator;

[0065] The present invention creatively provides a stator assembly, including a tooth core, which is formed by injection - molding a plurality of tooth - core units arranged in a circumferential direction together;

[0066] The assembly process of the stator is optimized, improving the stability of the tooth core and the stator; the welding and fixing process is omitted, saving production costs.

[0067] <Tooth core and yoke core>

[0068] As Figure 1a 、 Figure 1b and Figure 1c As shown in

[0069] Furthermore, two adjacent tooth core units 11 are connected by a first limiting structure;

[0070] Specifically, the tooth core unit 11 includes a root 111 and a neck 112. The root 111 is an arc-shaped section and is connected to the neck 112. The neck 112 extends along the radial direction of the tooth core unit 11; the root 111 forms a first limiting groove 1111 and a second limiting groove 1112 which are oppositely arranged. Along the circumferential direction of the tooth core unit 11, a first limiting groove 1111 is formed at one end of the root 111, and a second limiting groove 1112 is formed at the other end of the root 111;

[0071] The stator assembly further includes a plurality of limiting members 12. The limiting members 12 extend along the axial direction of the tooth core unit 11 and are formed with a first limiting platform 121 and a second limiting platform 122 which are oppositely arranged; specifically, the cross-section of the limiting member 12 is a cross-shaped structure;

[0072] A limiting member 12 is arranged between two adjacent roots 111. The second limiting groove 1112 of one root 111 cooperates with the first limiting platform 121 of the limiting member 12, and the first limiting groove 1111 of the other root 111 cooperates with the second limiting platform 122 of the limiting member 12, thereby realizing the connection of two adjacent tooth core units 11;

[0073] The yoke core includes a plurality of yoke core units 13. The yoke core units 13 are arranged at intervals with the tooth core units 11 in the circumferential direction, and the two are connected by a second limiting structure; specifically, the yoke core units 13 are arranged at intervals with the necks 112 of the tooth core units 11 and the yoke core units 13 are detachably connected to the necks 112;

[0074] Further, the neck portion 112 forms oppositely arranged third limiting grooves 1121 and fourth limiting grooves 1122. Along the circumferential direction of the tooth core unit 11, a third limiting groove 1121 is formed at one end of the neck portion 112, and a fourth limiting groove 1122 is formed at the other end of the neck portion 112; the yoke core unit 13 forms oppositely arranged third limiting platforms 131 and fourth limiting platforms 132;

[0075] A yoke core unit 13 is arranged between two adjacent neck portions 112. The third limiting platform 131 of the yoke core unit 13 cooperates with the fourth limiting groove 1122 of one neck portion 112, and the fourth limiting platform 132 of the yoke core unit 13 cooperates with the third limiting groove 1121 of the other neck portion 112, realizing the connection between one yoke core unit 13 and two neck portions 112. Further, multiple yoke cores and multiple tooth cores are arranged at intervals to form a stator core, enabling the motor to form an effective magnetic circuit;

[0076] In summary, multiple tooth core units 11 are injection-molded together to form a tooth core, optimizing the assembly process of the stator, improving the stability of the tooth core, the yoke core and the stator; eliminating the welding fixing process, saving production costs; arranging a yoke core between two adjacent neck portions 112, and the neck portion 112 and the yoke core are detachably connected; eliminating the welding fixing process, saving production costs; improving the assembly efficiency of the stator and avoiding the problem of large loss of the stator core caused by welding.

[0077] <Skeleton>

[0078] As Figure 2a 、 Figure 2b 、 Figure 2c and Figure 2d shown, the stator assembly further includes a skeleton 2. The skeleton 2 is formed by injecting molding compound into an injection molding space, and the injection molding space is surrounded by the outer side of the root portion 111 and the outer side of one end of the neck portion 112 close to the root portion 111;

[0079] Further, the skeleton 2 includes a first housing 21 and multiple second housings 22. The first housing 21 surrounds the outer side of the root portion 111 and has an annular structure; the second housings 22 extend radially along the first housing 21. Each second housing 22 surrounds the outer side of one end of the corresponding neck portion 112 close to the root portion 111, and the multiple second housings 22 are arranged on the outer peripheral surface of the first housing 21 along the circumferential direction of the first housing 21;

[0080] The structure and processing technology of the skeleton 2 are simplified, and the electrical insulation effect is improved;

[0081] To address the problems of complex winding slot structures and cumbersome processing techniques, this embodiment proposes that the skeleton 2 further includes a plurality of baffles 23, each baffle 23 being disposed on the corresponding second housing 22 and away from the first housing 21; a winding slot is formed between the baffle 23 and the first housing 21 for winding the winding 3 to prevent the winding 3 from detaching from the skeleton 2; specifically, the baffle 23 is integrally formed with or detachably connected to the second housing 22, and the baffle 23 extends circumferentially along the first housing 21; a wiring pin 231 is formed on the baffle 23 for electrically connecting the winding 3 to an external power line.

[0082] To address the problems of complex wire passing slot 211 structures and inconvenient wire winding, this embodiment proposes that the first housing 21 is formed with a wire passing slot 211 and a plurality of wire passing holes 212; each wire passing hole 212 communicates with the wire passing slot 211 and includes a wire inlet hole and a wire outlet hole, and one wire inlet hole and one wire outlet hole are correspondingly provided for each winding slot; the jumper wire of the winding 3 enters the wire passing slot 211 through the wire inlet hole and is led out through the wire outlet hole; the wire passing slot 211 plays a role in limiting and protecting the jumper wire of the winding 3.

[0083] <Motor>

[0084] As Figure 3a 、 Figure 3b 、 Figure 3c 、 Figure 4a 、 Figure 4b 、 Figure 5a and Figure 5b As shown in

[0085] This embodiment further provides a motor, which includes a rotor assembly 4, a first end cover 51, a second end cover 52, and the stator assembly described in any one of the above; the first housing 21 of the stator assembly is formed with a first shaft hole 213 and encloses a first installation cavity 214, the rotor assembly 4 is disposed in the first installation cavity 214 and includes a rotor shaft 41; the first end cover 51 is disposed at one end of the first housing 21, and one end of the rotor shaft 41 passes through the first shaft hole 213 and extends to the first end cover 51; the second end cover 52 is disposed at the other end of the first housing 21 and is formed with a second shaft hole 523, and the other end of the rotor passes through the second shaft hole 523 and extends outside the first installation cavity 214;

[0086] Specifically, the production process of the first end cap 51 is as follows: First, use a stamping machine to stamp and cut out the thin plate required for the first end cap 51; then stretch the thin plate to form the first side wall 511 and the first mounting portion 512. The first side wall 511 encloses the first bearing chamber, and a first bearing 71 is provided in the first bearing chamber. One end of the rotor shaft 41 is connected to the first end cap 51 through the first bearing 71; the first mounting portion 512 is connected to the first side wall 511 and is formed with four positioning protrusions 5121 spaced 90° apart along its circumferential direction. Each positioning protrusion 5121 is formed with a first threaded hole 5122; one end of the first housing 21 close to the first end cap 51 is formed with four positioning grooves 215 spaced 90° apart along its circumferential direction. A second threaded hole 2151 is formed at each positioning groove 215; the positioning protrusion 5121 cooperates with the positioning groove 215 to realize the positioning of the first end cap 51. The first threaded hole 5122 and the second threaded hole 2151 cooperate, and the first end cap 51 is fixed to the first housing 21 through screws; the outer peripheral surface of the first side wall 511 is formed with first grooves 5111 spaced 90° apart along its circumferential direction. The first grooves 5111 are semi-cylindrical structures and are used for positioning and supporting during the full plastic encapsulation of the motor;

[0087] The production process of the second end cap 52 is as follows: First, use a stamping machine to stamp and cut out the thin plate required for the second end cap 52; then stretch the thin plate to form the second side wall 521 and the second mounting portion 522. The second side wall 521 encloses the second bearing chamber, and a second bearing 72 is provided in the second bearing chamber. The other end of the rotor shaft 41 is connected to the second end cap 52 through the second bearing 72; the second mounting portion 522 is connected to the second side wall 521 and is formed with four positioning buckles 5221 spaced 90° apart along its circumferential direction. The yoke core unit 13 is formed with a card slot 133, and the buckle cooperates with the card slot 133 to realize the connection between the second end cap 52 and the yoke core unit 13; the outer peripheral surface of the second side wall 521 is formed with second grooves 5211 spaced 90° apart along its circumferential direction. The second grooves 5211 are semi-cylindrical structures and are used for positioning and supporting during the full plastic encapsulation of the motor;

[0088] Such as Figure 6a 、 Figure 6b 、 Figure 7a 、 Figure 7b and Figure 7cAs shown in the figure, the motor further includes an injection-molded housing 6, which includes a third side wall 61, a bottom wall 62, and a top wall 63. The third side wall 61, the bottom wall 62, and the top wall 63 enclose a second installation cavity 64. The stator assembly and the rotor assembly 4 are integrally arranged in the second installation cavity 64, thus forming a fully plastic-sealed motor. The bottom wall 62 is formed with a first side wall hole 621, and the first side wall 511 extends out of the second installation cavity 64 through the first side wall hole 621. The top wall 63 is formed with a second side wall hole 631, and the second side wall 521 extends out of the second installation cavity 64 through the second side wall hole 631. Four bolt holes 611 are formed on the outer peripheral surface of the third side wall 61 at intervals of 90° along the circumferential direction for fixing the fully plastic-sealed motor.

[0089] The production process of the motor is improved. The use of rubber sealing rings is cancelled, the protection level and safety factor of the motor are improved, the influence of the environment on the use of the motor is reduced, the materials required for producing the motor are reduced, and the qualified rate of the motor is improved. The problem of assembly clearance existing after the stator is assembled with the front end cover or the rear end cover is solved.

[0090] <Manufacturing method>

[0091] As Figure 8 shown in the figure, this embodiment further provides a manufacturing method of the motor as described above. The manufacturing method includes:

[0092] Arranging a plurality of processed tooth core units 11 in a first injection mold along the circumferential direction, and injecting injection molding material into the first injection mold to form a tooth core.

[0093] Placing the tooth core in a second injection mold, and injecting injection molding material into the second injection mold to form a skeleton 2.

[0094] Winding the wire and sequentially arranging the yoke core, the first end cover 51, the rotor assembly 4, and the second end cover 52.

[0095] Integrally arranging the stator assembly, the rotor assembly 4, the first end cover 51, and the second end cover 52 in a third injection mold, and injecting injection molding material into the third injection mold to form a fully plastic-sealed motor.

[0096] Specifically, the manufacturing method includes:

[0097] S1. Stamping out the tooth core units 11 with a tooth core unit 11 mold, and stamping out the yoke core units 13 with a yoke core unit 13 mold.

[0098] S2. Arranging a plurality of tooth core units 11 in a first injection mold along the circumferential direction, and injecting injection molding material into the first injection mold to form a tooth core.

[0099] S3, placing the tooth core in a second injection mold, and injecting the injection molding material into the second injection mold to form a skeleton 2;

[0100] S4, winding the gear core by a winding machine;

[0101] S5. Disposing a yoke core unit between two adjacent necks 112;

[0102] S6, setting and fixing the first end cover 51 at one end of the first shell 21;

[0103] S7, placing the rotor assembly 4 in the first installation cavity 214;

[0104] S8, disposing the second end cover 52 at one end of the first housing 21 and connecting it to the yoke core unit;

[0105] S9, placing the assembled stator assembly, rotor assembly 4, first end cover 51 and second end cover 52 in a third injection mold as a whole, and injecting the injection molding material into the third injection mold to form a fully plastic-encapsulated motor;

[0106] The motor is produced in a fully plastic-sealed manner, and the use of rubber sealing rings is eliminated, which improves the protection level and safety factor of the motor, reduces the impact of the environment on the use of the motor, reduces the materials required for the production of the motor, improves the qualification rate of the motor, simplifies the motor structure, and makes it easier to realize the automated production of the motor; solves the problem of an assembly gap after the stator and the front cover or the rear cover are assembled together, and solves the problem of numerous production processes and connection errors of the phase windings 3 of the ordinary block-type stator core motor.

[0107] The exemplary embodiments of the present disclosure are specifically shown and described above. It should be understood that the present disclosure is not limited to the detailed structures, configurations or implementations described herein; on the contrary, the present disclosure is intended to cover various modifications and equivalent configurations included in the spirit and scope of the appended claims.

Claims

1. A stator assembly, characterized in that, Comprising: A tooth core, which includes a plurality of tooth core units arranged circumferentially. Each tooth core unit includes a root and a neck connected to the root. The neck is located radially outside the root. The root is formed with a first limiting groove and a second limiting groove arranged oppositely, and the neck is formed with a third limiting groove and a fourth limiting groove arranged oppositely. Yoke core units, of which there are a plurality. Each yoke core unit is formed with a third limiting platform and a fourth limiting platform arranged oppositely. Limit members, of which there are a plurality. Each limit member is formed with a first limiting platform and a second limiting platform arranged oppositely. One of the limit members is arranged between two adjacent roots. The second limiting groove of one of the roots cooperates with the first limiting platform of the limit member, and the first limiting groove of the other root cooperates with the second limiting platform of the limit member, so that two adjacent tooth core units are connected. By injecting plastic encapsulant into the injection space to form a skeleton, and then injecting a plurality of the tooth core units together to form the tooth core. The injection space is surrounded by the outside of the root and the outside of one end of the neck close to the root. One of the yoke core units is arranged between two adjacent necks. The third limiting platform of the yoke core unit cooperates with the fourth limiting groove of one of the necks, and the fourth limiting platform of the yoke core unit cooperates with the third limiting groove of the other neck, so that one yoke core unit is connected to two adjacent necks.

2. The stator assembly according to claim 1, characterized in that The skeleton includes a first housing and a plurality of second housings. The first housing surrounds the outside of the root. Each second housing surrounds the outside of one end of the corresponding neck close to the root, and the plurality of second housings are arranged on the outer peripheral surface of the first housing along the circumferential direction of the first housing.

3. The stator assembly according to claim 2, wherein The skeleton further includes a plurality of baffles. Each baffle is arranged on the corresponding second housing and away from the first housing. A winding slot is formed between the baffle and the first housing for winding a winding.

4. The stator assembly according to claim 3, characterized in that, The first housing is formed with a wire passing slot and a wire passing hole. The wire passing hole is communicated with the wire passing slot, and two wire passing holes are correspondingly arranged for each winding slot. The cross-over wire of the winding enters the wire passing slot through one wire passing hole and exits through the other wire passing hole.

5. A motor, characterized in that, The motor includes a rotor assembly, a first end cover, a second end cover and the stator assembly according to any one of claims 1-4. The first housing of the stator assembly is formed with a first shaft hole and encloses a first installation cavity. The rotor assembly is arranged in the first installation cavity and includes a rotor shaft. The first end cover is arranged at one end of the first housing. One end of the rotor shaft passes through the first shaft hole and extends to the first end cover. The second end cover is arranged at the other end of the first housing and is formed with a second shaft hole. The other end of the rotor passes through the second shaft hole and extends outside the first installation cavity.

6. A manufacturing method of an electric machine as claimed in claim 5, characterized in that, The manufacturing method includes: Arranging a plurality of the processed tooth core units circumferentially in a first injection mold, and injecting injection plastic into the first injection mold to form the tooth core.

7. The manufacturing method of the motor according to claim 6, characterized in that, The manufacturing method further includes: Placing the tooth core in a second injection mold, and injecting injection molding material into the second injection mold to form a skeleton.

8. The manufacturing method of the motor according to claim 7, characterized in that, The manufacturing method further includes: Winding the tooth core by a winding machine; Arranging a yoke core unit between two adjacent necks.

9. The manufacturing method of the motor according to claim 8, characterized in that, The manufacturing method includes: Placing the first end cover at one end of the first housing; Placing the rotor assembly in the first installation cavity; Placing the second end cover at one end of the first housing and connecting it to the yoke core unit; Placing the assembled stator assembly, rotor assembly, first end cover and second end cover as a whole in a third injection mold, and injecting injection molding material into the third injection mold to form a fully plastic-encapsulated motor.

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